OBH548D.indd

SERVICE MANUAL

CONTENTS

1. TECHNICAL CHANGES

·······································

2. PART NAMES AND FUNCTIONS ····················· 3

3. SPECIFICATION ················································ 5

4. OUTLINES AND DIMENSIONS ························ 7

5. WIRING DIAGRAM ············································9

6. REFRIGERANT SYSTEM DIAGRAM ············· 11

7. SERVICE FUNCTIONS ···································12

8. MICROPROCESSOR CONTROL ···················14

9. TROUBLESHOOTING ····································· 21

10. DISASSEMBLY INSTRUCTIONS ···················· 40

No. OBH548

REVISED EDITION-D

SPLIT-TYPE AIR CONDITIONERS

INDOOR UNIT

Outdoor unit service manual

MUZ-GE•NA MUY-GE•NA

Series (OBH549)

MXZ-B·NA Series (OB444)

NOTE:

RoHS compliant products have <G> mark on the spec name plate.

PARTS CATALOG (OBB548)

Revision D:

• MSZ-GE06/09/12/15/18NA-

and MSY-

GE09/12/15/18NA-

have been added.

Please void OBH548 REVISED EDITION-C

MSZ-GE06NA

MSZ-GE09NA

MSZ-GE12NA

MSZ-GE15NA

MSZ-GE18NA

MSZ-GE24NA

MSY-GE09NA

MSY-GE12NA

MSY-GE15NA

MSY-GE18NA

MSY-GE24NA

Models

MSZ-GE06/09/12/15/18NA

MSY-GE09/12/15/18NA

MSZ-GE06NA-

MSZ-GE09NA-

MSZ-GE12NA-

MSZ-GE15NA-

MSZ-GE18NA-

MSY-GE09NA-

MSY-GE12NA-

MSY-GE15NA-

MSY-GE18NA-

MSZ-GE06NA MSZ-GE09NA MSZ-GE12NA MSZ-GE15NA MSZ-GE18NA MSZ-GE24NA

MSY-GE09NA MSY-GE12NA MSY-GE15NA MSY-GE18NA MSY-GE24NA

1. New model

TECHNICAL CHANGES

Revision A:

• MSZ-GE24NA and MSY-GE24NA have been added.

Revision B:

• MSZ-GE06/09/12/15/18NA-

and MSY-GE09/12/15/18NA-

have been added.

Revision D:

• MSZ-GE06/09/12/15/18NA-

and MSY-GE09/12/15/18NA-

have been added.

Use the speciﬁ ed refrigerant only

Never use any refrigerant other than that specified.

Doing so may cause a burst, an explosion, or fire when the unit is being used, serviced, or disposed of.

Correct refrigerant is specified in the manuals and on the spec labels provided with our products.

We will not be held responsible for mechanical failure, system malfunction, unit breakdown or accidents caused by

failure to follow the instructions.

MSZ-GE06NA

MSZ-GE06NA -

MSZ-GE09NA

MSZ-GE09NA -

MSZ-GE12NA

MSZ-GE12NA -

MSZ-GE15NA

MSZ-GE15NA -

MSZ-GE18NA

MSZ-GE18NA -

MSY-GE09NA

MSY-GE09NA -

MSY-GE12NA

MSY-GE12NA -

MSY-GE15NA

MSY-GE15NA -

MSY-GE18NA

MSY-GE18NA -

1. These models have been modified to be compatible with Honeywell remote controller.

2. Indoor electronic control P.C. board has been changed.

MSZ-GE06NA -

MSZ-GE09NA -

MSZ-GE12NA -

MSZ-GE15NA -

MSZ-GE18NA -

MSY-GE09NA -

MSY-GE12NA -

MSY-GE15NA -

MSY-GE18NA -

1. Model name has been changed.

2. New service parts numbers (Refer to OBB548 1-9 to 1-12.)

Revision C:

• Specification has been corrected.

The value of "Moisture removal" for MSZ-GE24NA and MSY-GE24NA has been corrected. [

2.7

pt./h

5.1

pt./h]

OBH548D

MSZ-GE06NA MSZ-GE09NA MSZ-GE12NA MSZ-GE15NA MSZ-GE18NA

MSY-GE09NA MSY-GE12NA MSY-GE15NA MSY-GE18NA

Remote controller

Operation indicator lamp

Remote control receiving section

Emergency operation switch (E.O. SW)

Horizontal vane

Air outlet

Air ¿ lter

[Catechin air ¿ lter

(GENA)

]

Air inlet

Heat exchanger

Front panel

Air cleaning ¿ lter

(Anti-Allergy Enzyme

Filter)

[Nano platinum ¿ lter

(GENA-

8 ,

)

]

Display section

PART NAMES AND FUNCTIONS

ACCESSORIES

Installation plate 1

Installation plate ¿ xing screw 4 × 25 mm 5

Remote controller holder 1

Fixing screw for 3.5 × 16 mm (Black) 2

Battery (AAA) for remote controller 2

Wireless remote controller 1

Felt tape (Used for left or left-rear piping) 1

OBH548D

Remote controller

Display section

Front panel

Air ¿ lter

(Nano platinum filter)

Air inlet

Air cleaning filter

(Electrostatic anti-allergy

enzyme filter)

Air outlet

Horizontal vane

Heat exchanger

MSZ-GE24NA

MSY-GE24NA

ACCESSORIES

Installation plate 1

Installation plate ¿ xing screw 4 × 25 mm 7

Remote controller holder 1

Fixing screw for 3.5 × 16 mm (Black) 2

Battery (AAA) for remote controller 2

Wireless remote controller 1

Felt tape (Used for left or left-rear piping) 1

Air cleaning ¿ lter 2

OBH548D

Indoor model MSZ-GE06NA

MSZ-GE09NA

MSY-GE09NA

MSZ-GE12NA

MSY-GE12NA

Power supply V, phase, Hz 208/230, 1, 60

Max. fuse size (time delay)/ Disconnect switch

A15

Min. circuit ampacity A 1.0

Fan motor F.L.A 0.76

AirÀ ow

Super High - High - Med. -

Low - Quiet

COOL Dry

(Wet)

CFM

399-321-237-170-145

(364-286-201-134-109)

HEAT Dry CFM 406-321-233-170-145 406-321-237-170-145

Moisture removal pt./h – 1.5 2.5

Sound level

Super High - High - Med. -

Low - Quiet

Cooling dB(A)

43-37-30-22-19

45-37-30-22-19

Heating dB(A) 43-37-30-22-19

Cond. drain connection O.D. in. 5/8

Dimensions

in.

31-7/16

D9-1/8

H11-5/8

Weight Ib. 22

External ¿ nish Munsell 1.0Y 9.2/0.2

Control voltage (by built-in transformer) 12 - 24 VDC

Indoor model

MSZ-GE15NA

MSY-GE15NA

MSZ-GE18NA

MSY-GE18NA

MSZ-GE24NA

MSY-GE24NA

Power supply V, phase, Hz 208/230, 1, 60

Max. fuse size (time delay)/ Disconnect switch

A15 20

Min. circuit ampacity A 1.0

Fan motor F.L.A 0.76

AirÀ ow

Super High - High - Med. -

Low - Quiet (GE15/18)

Powerful - High - Med - Low

(GE24)

COOL Dry

(Wet)

CFM

533-420-335-272-205

(498-385-300-237-170)

533-420-339-275-230

( 498-385-304-240-194)

738-628-469-388

(661-562-420-347)

HEAT Dry CFM 463-367-304-247-205 512-431-339-275-230 738-628-469-388

Moisture removal pt./h 2.7 4.6 5.1

Sound level

Super High - High - Med. -

Low - Quiet (GE15/18)

Powerful - High - Med - Low

(GE24)

Cooling dB(A) 49-44-38-32-26 49-44-38-33-28

53-49-41-34

Heating dB(A) 46-40-35-30-26 49-43-38-33-28

52-49-41-32

Cond. drain connection O.D. in. 5/8

Dimensions

in.

31-7/16 43-5/16

D 9-1/8 9-3/8

H 11-5/8 12-13/16

Weight Ib. 22 37

External ¿ nish Munsell 1.0Y 9.2/0.2

Control voltage (by built-in transformer) 12 - 24 VDC

NOTE: Test conditions are based on AHRI 210/240.

SPECIFICATION

OBH548D

3-2. OUTLET AIR SPEED AND COVERAGE

Ɣ The air coverage is the figure up to the

position where the air speed is 1 ft./s.,

when air is blown out horizontally from

the unit properly at the High speed posi-

tion.

The coverage should be used only as a

general guideline since it varies accord-

ing to the size of the room and furniture

arranged inside the room.

(2) OPERATION

Mode Condition

Intake air temperature (°F)

Indoor Outdoor

DB WB DB WB

Cooling

Standard temperature 80 67 95 —

Maximum temperature 90 73 115 —

Minimum temperature 67 57 14 —

Maximum humidity 78% —

Heating

Standard temperature 70 60 47 43

Maximum temperature 80 67 75 65

Minimum temperature 70 60 -4 -5

3-1. OPERATING RANGE

(1) POWER SUPPLY

Rated voltage Guaranteed voltage (V)

Indoor unit

208/230 V

1 phase

60 Hz

Min. 187

208 230 Max. 253

Model Mode Function

AirÀ ow

(CFM)

Air speed

(ft./s.)

Coverage

(ft.)

MSZ-GE06NA

HEAT Dry 406 20.6 29.5

COOL

Dry 321 16.3 23.5

Wet 286 14.5 21.0

MSZ-GE09NA

MSY-GE09NA

HEAT Dry 406 20.6 29.5

COOL

Dry 321 16.3 23.5

Wet 286 14.5 21.0

MSZ-GE12NA

MSY-GE12NA

HEAT Dry 406 20.6 29.5

COOL

Dry 321 16.3 23.5

Wet 286 14.5 21.0

MSZ-GE15NA

MSY-GE15NA

HEAT Dry 463 23.4 33.5

COOL

Dry 420 21.3 30.5

Wet 385 19.5 28.0

MSZ-GE18NA

MSY-GE18NA

HEAT Dry 512 25.9 36.9

COOL

Dry 420 21.3 30.5

Wet 385 19.5 28.0

MSZ-GE24NA

MSY-GE24NA

HEAT Dry 738 18.0 36.9

COOL

Dry 738 18.0 36.9

Wet 661 16.1 33.2

OBH548D

Unit: inch

MSZ-GE06NA MSZ-GE09NA MSZ-GE12NA MSZ-GE15NA MSZ-GE18NA

MSY-GE09NA MSY-GE12NA MSY-GE15NA MSY-GE18NA

8-5/16

9-1/8

9-15/16

7/8

6-1/8 6-1/8

3-1/8

8-7/8 8-7/8

1/8

3/4

6 - 1/4

2- 5/16

3/16

9-1/8

2-3/16

2-3/4

31-7/16

30-15/16 1/4

5-1/824-3/81-15/16

11-5/8

1-15/16

1-5/8

2-3/16

1-11/16

1-5/8

5/16

3-15/16

4/3/16

4-3/8

1-3/4

2-3/16

2-11/16

13-5/162-3/8

8-3/8

1-5/8

13-9/16 2-1/8

7/16×1 Oblong hole

7/16×13/16 Oblong hole

Installation plate

Indoor unit

Wall hole ø2-9/16

Air in

Air out

Installation plate

Piping

Drain hose

Piping

Insulation ø1 - 3/8 O.D

Liquid line ø1/4 19 - 11/16 (Flared connection ø1/4)

Gas line ø3/8 16 - 15/16

(Flared connection: ø3/8 (GE06/09/12NA), ø1/2 (GE15/18NA))

Drain hose Insulation ø1-1/8 O.D Connected part ø5/8 O.D

Piping

Insulation ø1 - 3/8 O.D

Liquid line ø1/4 19 - 11/16 (Flared connection ø1/4)

Gas line ø3/8 16 - 15/16

(Flared connection: ø3/8 (GE06/09/12NA), ø1/2 (GE15/18NA))

Drain hose Insulation ø1-1/8 O.D Connected part ø5/8 O.D

OUTLINES AND DIMENSIONS

MSZ-GE06NA-

MSZ-GE09NA-

MSZ-GE12NA-

MSZ-GE15NA-

MSZ-GE18NA-

MSY-GE09NA-

MSY-GE12NA-

MSY-GE15NA-

MSY-GE18NA-

MSZ-GE06NA-

MSZ-GE09NA-

MSZ-GE12NA-

MSZ-GE15NA-

MSZ-GE18NA-

MSY-GE09NA-

MSY-GE12NA-

MSY-GE15NA-

MSY-GE18NA-

OBH548D

MSZ-GE24NA

MSY-GE24NA

42-7/8 3/16

43-5/16

1-3/4 9-3/8

10-3/16

1/8

8-7/8 8-7/8

5-1/16

9-7/16

11-1/16

1-3/4

1-15/16 19-3/4 17-5/16

7-27/327-27/32

4-3/8

2-9/16

2-1/2

3 33-1/8 7-1/8

2-9/16

1-3/16

2-1/2

2-9/16

2-5/8

2-1/2

12-13/16

1/8

3-15/16

4-7/8

6-5/16

4-5/16

(

70°

)

9-3/8

3/16

8-1/4

27/32

7-1/4

1/2

Piping

Insulation Ø2 O.D

Liquid line Ø3/8 19-11/16 (Flared connection Ø3/8)

Gas line Ø1/2 16-15/16 (Flared connection Ø5/8)

Drain hose

Insulation Ø1-1/8 Connected part Ø5/8 O.D

Air out

Piping

Drain hose

7/16×1 Oblong hole

7/16×3/4 Oblong hole

Installation plate

Indoor unit

Wall hole

Air in

Installation plate

3/4

6-1/4

2-5/16

OBH548D

MSZ-GE06NA MSZ-GE09NA MSZ-GE12NA MSZ-GE15NA MSZ-GE18NA

MSY-GE09NA MSY-GE12NA MSY-GE15NA MSY-GE18NA

WIRING DIAGRAM

MSZ-GE06NA-

MSZ-GE09NA-

MSZ-GE12NA-

MSZ-GE15NA-

MSZ-GE18NA-

MSY-GE09NA-

MSY-GE12NA-

MSY-GE15NA-

MSY-GE18NA-

OBH548D

MSZ-GE06NA-

MSZ-GE09NA-

MSZ-GE12NA-

MSZ-GE15NA-

MSZ-GE18NA-

MSY-GE09NA-

MSY-GE12NA-

MSY-GE15NA-

MSY-GE18NA-

MSZ-GE24NA

MSY-GE24NA

OBH548D

MSZ-GE06NA MSZ-GE09NA MSZ-GE12NA MSZ-GE15NA MSZ-GE18NA

MSY-GE09NA MSY-GE12NA MSY-GE15NA MSY-GE18NA

Unit: inch

Indoor

heat

exchanger

Flared connection

Room temperature

thermistor

RT11

Flared connection

Refrigerant pipe ø3/8 (MSZ-GE06/09/12NA, MSY-GE09/12NA)

ø1/2 (MSZ-GE15/18NA, MSY-GE15/18NA)

(with heat insulator)

Refrigerant pipe ø1/4

(with heat insulator)

Indoor coil

thermistor

RT12 (main)

Indoor coil

thermistor

RT13 (sub)

Refrigerant flow in cooling

Refrigerant flow in heating

REFRIGERANT SYSTEM DIAGRAM

MSZ-GE24NA

MSY-GE24NA

Indoor

heat

exchanger

Flared connection

Room temperature

thermistor

RT11

Flared connection

Refrigerant pipe ø5/8

(with heat insulator)

Refrigerant pipe ø3/8

(with heat insulator)

Indoor coil

thermistor

RT12 (main)

Indoor coil

thermistor

RT13 (sub)

Refrigerant flow in cooling

Refrigerant flow in heating

OBH548D

7-1. TIMER SHORT MODE

For service, the set time can be shortened by bridging of JPG and JPS the indoor electronic control P.C. board.

The time will be shortened as follows. (Refer to 9-7.)

• The set time for the ON/OFF timer can be reduced to 1 second for each minutes.

• After the breaker is turned on, the time for starting the compressor, which normally takes 3 minuets, can be reduced to

3 seconds. Restarting the compressor, which takes 3 minuets, cannot be reduced.

7-2. P.C. BOARD MODIFICATION FOR INDIVIDUAL OPERATION

A maximum of 4 indoor units with wireless remote controllers can be used in a room.

In this case, to operate each indoor unit individually by each remote controller, P.C. boards of remote controller must be

modified according to the number of the indoor unit.

How to modify the remote controller P.C. board

Remove batteries before modification.

The board has a print as shown below:

The P.C. board has the print “J1” and “J2”. Solder “J1” and “J2” according to the number of indoor unit as shown in Table 1.

After modification, press the RESET button.

NOTE: For modification, take out the batteries and

press the OPERATE/STOP (ON/OFF) button

twice or 3 times at first.

After finish modification, put back the batteries

then press the RESET button.

MSZ-GE06NA MSZ-GE09NA MSZ-GE12NA MSZ-GE15NA MSZ-GE18NA MSZ-GE24NA

MSY-GE09NA MSY-GE12NA MSY-GE15NA MSY-GE18NA MSY-GE24NA

Table 1

1 unit operation 2 units operation 3 units operation 4 units operation

No. 1 unit No modi¿ cation Same as at left Same as at left Same as at left

No. 2 unit — Solder J1 Same as at left Same as at left

No. 3 unit — — Solder J2 Same as at left

No. 4 unit — — — Solder both J1 and J2

How to set the remote controller exclusively for particular indoor unit

After you turn the breaker ON, the first remote controller that sends the signal to the indoor unit will be regarded as the remote

controller for the indoor unit.

The indoor unit will only accept the signal from the remote controller that has been assigned to the indoor unit once they are

set.

The setting will be cancelled if the breaker has turned OFF, or the power supply has shut down.

Please conduct the above setting once again after the power has been restored.

SERVICE FUNCTIONS

OBH548D

NOTE:

•

The operation settings are memorized when 10 seconds have passed after the indoor unit was operated with the

remote controller.

• If main power is turned OFF or a power failure occurs while AUTO START/STOP timer is active, the timer setting is

cancelled.

• If the unit has been OFF with the remote controller before power failure, the auto restart function does not work as

the power button of the remote controller is OFF.

• To prevent breaker OFF due to the rush of starting current, systematize other home appliance not to turn ON at the

same time.

• When some air conditioners are connected to the same supply system, if they are operated before power failure, the

starting current of all the compressors may flow simultaneously at restart.

Therefore, the special counter-measures are required to prevent the main voltage-drop or the rush of the starting

current by adding to the system that allows the units to start one by one.

7-3. AUTO RESTART FUNCTION

When the indoor unit is controlled with the remote controller, the operation mode, the set temperature, and the fan speed

are memorized by the indoor electronic control P.C. board. “AUTO RESTART FUNCTION” automatically starts operation

in the same mode just before the shut-off of the main power.

Operation

If the main power has been cut, the operation settings remain.

After the power is restored, the unit restarts automatically according to the memory.

(However, it takes at least 3 minutes for the compressor to start running.)

How to disable “AUTO RESTART FUNCTION”

Turn OFF the main power of the unit.

Solder the Jumper wire JR07 on the indoor electronic control P.C. board. (Refer to 9-7.)

CN111

CN112

CN152

CN10A

Indoor electronic

control P.C. board

JR07

CN151

CN111CN112CN151CN10A

Indoor electronic

control P.C. board

JR07

MSZ-GE24NA

MSY-GE24NA

MSZ-GE06/09/12/15/18NA

MSY-GE09/12/15/18NA

OBH548D

WIRELESS REMOTE CONTROLLER

MSZ-GE06NA MSZ-GE09NA MSZ-GE12NA MSZ-GE15NA MSZ-GE18NA MSZ-GE24NA

MSY-GE09NA MSY-GE12NA MSY-GE15NA MSY-GE18NA MSY-GE24NA

NOTE: Last setting will be stored after the unit is turned OFF with the remote controller. Indoor unit receives the signal of the

remote controller with beeps.

ON TIMER button

CLOCK SET button

TIME SET buttons

FORWARD button

BACKWARD button

OFF TIMER button

RESET button

SMART SET button

VANE CONTROL button

Signal transmitting section

Operation display section

Temperature buttons

OPERATE/STOP

(ON/OFF) button

FAN SPEED CONTROL button

OPERATION SELECT button

ECONO COOL button

Indication of

remote controller

model is on back

MICROPROCESSOR CONTROL

E.g.: MSZ type

MSZ-GE06NA MSZ-GE09NA MSZ-GE12NA MSZ-GE15NA MSZ-GE18NA

MSY-GE09NA MSY-GE12NA MSY-GE15NA MSY-GE18NA

MSZ-GE24NA

MSY-GE24NA

Signal transmitting section

Operation display section

Indication of

remote controller

model is on back

Temperature buttons

VANE CONTROL button

(Horizontal vane button)

WIDE VANE button

(Vertical vane button)

ON TIMER button

CLOCK SET button

TIME SET buttons

FORWARD button

BACKWARD button

OFF TIMER button

RESET button

POWERFUL button

OPERATE/STOP

(ON/OFF) button

FAN SPEED CONTROL button

OPERATION SELECT button

ECONO COOL button

OBH548D

Operation Indicator lamp

The operation indicator at the right side of the indoor unit indicates the operation state.

• The following indication applies regardless of shape of the indication.

Indication Operation state Room temperature

The unit is operating to

reach the set temperature

About 4°F(2°C) or more

away from set tempera-

ture

The room temperature is

approaching the set tem-

perature

About 2 to 4°F(1 to 2°C)

from set temperature

Standby mode

(Only during multi system

operation)

INDOOR UNIT DISPLAY SECTION

Lighted

Blinking

Not lighted

8-1. COOL ( ) OPERATION

(1) Press OPERATE/STOP (ON/OFF) button.

OPERATION INDICATOR lamp of the indoor unit turns ON with a beep tone.

(2) Select COOL mode with OPERATION SELECT button.

(3) Press TEMPERATURE buttons (TOO WARM or TOO COOL button) to select the desired temperature.

The setting range is 61 ~ 88°F (16 ~ 31°C).

1. Coil frost prevention

The compressor operational frequency is controlled by the temperature of the indoor heat exchanger to prevent the coil from

frosting.

When the temperature of indoor heat exchanger becomes too low, the coil frost prevention mode works.

The indoor fan operates at the set speed and the compressor stops. This mode continues until the temperature of indoor

heat exchanger rises.

2. Low outside temperature operation

When the outside temperature is lower, low outside temperature operation starts, and the outdoor fan slows or stops.

8-2. DRY ( ) OPERATION

(1) Press OPERATE/STOP (ON/OFF) button.

OPERATION INDICATOR lamp of the indoor unit turns ON with a beep tone.

(2) Select DRY mode with OPERATION SELECT button.

(3) The set temperature is determined from the initial room temperature.

1. Coil frost prevention

Coil frost prevention works the same way as that in the COOL mode. (8-1.1.)

2. Low outside temperature operation

Low outside temperature operation works the same way as that in the COOL mode. (8-1.2.)

OBH548D

8-3. HEAT ( ) OPERATION (MSZ)

(1) Press OPERATE/STOP (ON/OFF) button.

OPERATION INDICATOR lamp of the indoor unit turns ON with a beep tone.

(2) Select HEAT mode with OPERATION SELECT button.

(3) Press TEMPERATURE buttons (TOO WARM or TOO COOL button) to select the desired temperature.

The setting range is 61 ~ 88°F (16 ~ 31°C).

1. Cold air prevention control

When the compressor is not operating or is starting, and the temperature of indoor heat exchanger and/or the room tem-

perature is low or when defrosting is being done, the indoor fan will stop or rotate in Very Low speed.

2. High pressure protection

The compressor operational frequency is controlled by the temperature of the indoor heat exchanger to prevent the con-

densing pressure from increasing excessively.

When the temperature of indoor heat exchanger becomes too high, the high pressure protection works.

The indoor fan operates following the cold air prevention control. This mode continues until the temperature of indoor heat

exchanger falls.

3. Defrosting

Defrosting starts when the temperature of outdoor heat exchanger becomes too low.

The compressor stops once, the indoor/outdoor fans stop, the 4-way valve reverses and the compressor re-starts.

This mode continues until the temperature of outdoor heat exchanger rises or the fixed time passes.

8-4. FAN( )OPERATION (MSY)

(1) Press OPERATE/STOP (ON/OFF) button.

OPERATION INDICATOR lamp of the indoor unit turns ON with a beep tone.

(2) Select FAN mode with OPERATION SELECT button.

(3) Select the desired fan speed. When AUTO, it becomes Low.

Only indoor fan operates. Outdoor unit does not operate.

8-5. “I FEEL CONTROL” ( ) OPERATION (MSY)

(1) Press OPERATE/STOP (ON/OFF) button on the remote controller. OPERATION INDICATOR lamp of the indoor unit

turns ON with a beep tone.

(2) Select “I FEEL CONTROL” mode with OPERATION SELECT button.

(3) The operation mode is determined by the room temperature at start-up of the operation.

• Once the mode is fixed, the mode does not change by room temperature afterwards.

• Under the ON TIMER (

) operation, mode is determined according to the room temperature at the start-up of

operation.

(4) The initial set temperature is decided by the initial room temperature.

Initial room temperature Model Initial set temperature

79°F (26°C) or more

COOL mode of

"I FEEL CONTROL"

75°F (24°C)

77 to 79°F (25 to 26°C) Initial room temperature minus 4°F (2°C)

Less than 79°F (25°C)

DRY mode of

"I FEEL CONTROL"

Initial room temperature minus 4°F (2°C)

(5) TEMPERATURE buttons

In “I FEEL CONTROL” (

) mode, set temperature is decided by the microprocessor based on the room temperature.

In addition, set temperature can be controlled by TOO WARM or TOO COOL buttons when you feel too cool or too

warm.

Each time the TOO WARM or TOO COOL button is pressed, the indoor unit receives the signal and emits a beep tone.

• Fuzzy control

When the TOO COOL or TOO WARM button is pressed, the microprocessor changes the set temperature, consider-

ing the room temperature, the frequency of pressing TOO COOL or TOO WARM button and the user's preference to

heat or cool. So this is called “Fuzzy control”, and works only in “I FEEL CONTROL” mode.

In DRY mode of “I FEEL CONTROL”, the set temperature does not change.

TOO

COOL

…

To raise the set temperature 2~4°F (1~2°C)

TOO

WARM

…

To lower the set temperature 2~4°F (1~2°C)

OBH548D

8-6. AUTO CHANGE OVER ··· AUTO MODE OPERATION (MSZ)

Once desired temperature is set, unit operation is switched automatically between COOL and HEAT operation.

Mode selection

(1) Initial mode

When unit starts the operation with AUTO operation from OFF:

• If the room temperature is higher than the set temperature, operation starts in COOL mode.

• If the room temperature is equal to or lower than the set temperature, operation starts in HEAT mode.

(2) Mode change

COOL mode changes to HEAT mode when about 15 minutes have passed with the room temperature 2°F (1°C) below

the set temperature.

HEAT mode changes to COOL mode when about 15 minutes have passed with the room temperature 2°F (1°C) above

the set temperature.

NOTE1

If two or more indoor units are operating in multi system, there might be a case that the indoor unit, which is operating in

(AUTO), cannot change over to the other operating mode (COOL ļ HEAT(MSZ)) and becomes a state of standby.

Refer to NOTE2 "FOR MULTI SYSTEM AIR CONDITIONER".

NOTE2

FOR MULTI SYSTEM AIR CONDITIONER

OUTDOOR UNIT: MXZ series

Multi system air conditioner can connect two or more indoor units with one outdoor unit.

• When you try to operate two or more indoor units with one outdoor unit simultaneously, one for the cooling and

the others for heating, the operation mode of the indoor unit that operates first is selected. Other indoor units

cannot operate, and operation indicator lamp flashes as shown in the figure below. In this case, please set all the

indoor units to the same operation mode.

• When indoor unit starts the operation while the defrosting of outdoor unit is being done, it takes a few minutes (max.

10 minutes) to blow out the warm air.

• In the heating operation, though indoor unit that does not operate may get warm or the sound of refrigerant flow-

ing may be heard, they are not malfunction. The reason is that the refrigerant continuously flows into it.

Lighted

Blinking

Not lighted

8-7. AUTO VANE OPERATION

1. Horizontal vane

(1) Vane motor drive

These models are equipped with a stepping motor for the horizontal vane. The rotating direction, speed, and angle of

the motor are controlled by pulse signals (approximately 12 V) transmitted from indoor microprocessor.

(2) The horizontal vane angle and mode change as follows by pressing VANE CONTROL button.

(3) Positioning

To confirm the standard position, the vane moves until it touches the vane stopper. Then the vane is set to the selected

angle.

Confirming of standard position is performed in the following cases:

(a) When the operation starts or finishes (including timer operation).

(b) When the test run operation starts.

OBH548D

(4) VANE AUTO (

) mode

The microprocessor automatically determines the vane angle to make the optimum room temperature distribution.

Horizontal

position

In COOL and DRY operation

ane angle is fixed to Horizontal position.

In HEAT operation

Vane angle is fixed to Angle 5.

(5) STOP (operation OFF) and ON TIMER standby

In the following cases, the horizontal vane returns to the closed position.

(a) When OPERATE/STOP (ON/OFF) button is pressed (POWER OFF).

(b) When the operation is stopped by the emergency operation.

(6) Dew prevention

During COOL or DRY operation with the vane angle at Angle 4 or 5 when the compressor cumulative operation time

exceeds 1 hour, the vane angle automatically changes to Angle 1 for dew prevention.

(7) SWING (

) mode

By selecting SWING mode with VANE CONTROL button, the horizontal vane swings vertically.

(8) Cold air prevention in HEAT operation (MSZ)

The horizontal vane position is set to Upward.

NOTE: When 2 or more indoor units are operated with multi outdoor unit, even if any indoor unit turns thermostat OFF,

this control does not work in the indoor unit.

(9) ECONO COOL (

) operation (ECONOmical operation)

When ECONO COOL button is pressed in COOL mode, set temperature is automatically set 4°F(2°C) higher.

Also the horizontal vane swings in various cycle.

SWING operation makes you feel cooler than set temperature. So, even though the set temperature is higher, the air

conditioner can keep comfort. As a result, energy can be saved.

To cancel this operation, select a different mode or press one of the following buttons in ECONO COOL operation:

ECONO COOL, VANE CONTROL, or POWERFUL(MSZ/MSY-GE24NA) button.

(

) POWERFUL ( ) operation. (MSZ-GE24NA MSY-GE24NA)

The air conditioner automatically adjusts the fan speed and the set temperature, and operates the POWERFUL mode.

The POWERFUL mode is automatically released 15 minutes after operation starts, and the operation mode returns

to the mode prior to POWERFUL operation. To manually cancel this operation, select a different mode or press

POWERFUL or ECONO COOL button.

2. Vertical vane

(MSZ-GE24NA MSY-GE24NA)

(1) Vane motor drive

These models are equipped with a stepping motor for the vertical vane. The rotating direction, speed, and angle of the

motor are controlled by pulse signals (approximately 12 V) transmitted from microprocessor.

(2) The vertical vane angle and mode change as follows by pressing WIDE VANE button.

(3) Positioning

(a) When OPERATE/STOP (ON/OFF) button is pressed (POWER ON).

(b) When SWING is started.

(4) SWING MODE (

)

By selecting SWING mode with WIDE VANE button, the vertical vane swings horizontally.

The remote controller displays “

”. Swing mode is cancelled when WIDE MODE button is pressed once again.

45SWING

(5) WIDE MODE ( )

By selecting WIDE mode with WIDE VANE button, indoor fan speed becomes faster than setting fan speed on the

remote controller (

). The remote controller displays “ ”.

NOTE:

Indoor fan speed becomes faster than setting fan speed on the remote controller even when or is

selected.

OBH548D

8-8. TIMER OPERATION

1. How to set the time

(1) Check that the current time is set correctly.

NOTE: Timer operation will not work without setting the current time. Initially “0:00 AM” blinks at the current time display

of TIME MONITOR, so set the current time correctly with CLOCK SET button.

How to set the current time

(a) Press the CLOCK set button.

(b) Press the TIME SET buttons (

and

) to set the current time.

• Each time FORWARD button (

) is pressed, the set time increases by 1 minute, and each time BACK-

WARD button (

) is pressed, the set time decreases by 1 minute.

• Pressing those buttons longer, the set time increases/decreases by 10 minutes.

(2) Press OPERATE/STOP (ON/OFF) button to start the air conditioner.

(3) Set the time of timer.

ON timer setting

(a) Press ON TIMER button (

) during operation.

(b) Set the time of the timer using TIME SET buttons (

and

OFF timer setting

(a) Press OFF TIMER button

( )

during operation.

(b) Set the time of the timer using TIME SET buttons (

and

Each time FORWARD button (

) is pressed, the set time increases by 10 minutes: each time BACKWARD

button (

) is pressed, the set time decreases by 10 minutes.

2. To release the timer

To release ON timer, press ON TIMER button (

To release OFF timer, press OFF TIMER button (

TIMER is cancelled and the display of set time disappears.

(Example 1)

The current time is 8:00 PM.

The unit turns OFF at 11:00 PM, and ON at 6:00

AM.

• OFF timer and ON timer can be used in combination. The set time that is reached first will operate first.

• “

” and “ ” display shows the order of OFF timer and ON timer operation.

PROGRAM TIMER

(Example 2)

The current time is 11:00 AM.

The unit turns ON at 5:00 PM, and OFF at 9:00

PM.

NOTE: If the main power is turned OFF or a power failure occurs while ON/OFF timer is active, the timer setting is can-

celled. As these models are equipped with an auto restart function, the air conditioner starts operating with timer

cancelled when power is restored.

OBH548D

8-9. SMART SET ( ) OPERATION (MSZ-GE06/09/12/15/18NA MSY-09/12/15/18NA)

1. How to SET SMART SET operation

(1) Press OPERATE/STOP (ON/OFF) button.

(2) Select COOL, HEAT (MSZ) or ECONO COOL mode.

(3) Press SMART SET button.

(4) Set the temperature, fan speed, and airÀ ow direction for SMART SET operation.

NOTE: • SMART SET operation cannot be selected during DRY or AUTO mode operation.

• The setting range of HEAT mode in SMART SET operation is between 50°F (10°C) and 61 - 87°F (16 - 31°C)

(MSZ).

• 2 settings can be saved. (One for COOL/ECONO COOL, one for HEAT) (MSZ).

• 1 setting can be saved. (MSY).

2. How to cancel operation

• Press SMART SET button again.

• SMART SET operation can also be cancelled by pressing OPERATION SELECT button to change the operation mode.

The same setting will be selected from the next time by simply pressing SMART SET button.

8-10. EMERGENCY/TEST OPERATION

In the case of test run operation or emergency operation, use EMERGENCY OPERATION switch on the right side of the

indoor unit. Emergency operation is available when the remote

controller is missing, has failed, or when the batteries in the remote

controller running down. The unit will start and OPERATION

INDICATOR lamp will light up.

The first 30 minutes of operation is the test run operation. This

operation is for servicing. The indoor fan runs at High speed and

the temperature control does not work.

After 30 minutes of test run operation, the system shifts to

EMERGENCY COOL/HEAT(MSZ) MODE with a set temperature of

75°F (24°C). The fan speed shifts to Med.

All protective operations such as the coil frost prevention works

even in the test run or emergency operation.

In the test run or emergency operation, the horizontal vane oper-

ates in VANE AUTO (

) mode.

Emergency operation continues until EMERGENCY OPERATION

switch is pressed once or twice or the unit receives any signal from

the remote controller. In the latter case normal operation will start.

NOTE: Do not press EMERGENCY OPERATION switch during

normal operation.

8-11. 3-MINUTE TIME DELAY OPERATION

When the system turns OFF, compressor will not restart for 3 minutes as 3-minute time delay function operates to protect

compressor from overload.

8-12. Changing temperature indication (°F/°C)

• The preset unit is °F.

• °F ĺ °C: Press RESET button while the temperature

buttons are pressed.

• °C ĺ °F: Press RESET button or remove the batteries .

Press RESET button gently using

a thin instrument.

Operation mode COOL HEAT (MSZ)

Set temperature 75°F(24°C) 75°F(24°C)

Fan speed Med. Med.

Horizontal vane Auto Auto

The operation mode is indicated by the Operation

Indicator lamp as following

Lighted

Not lighted

MSZ

EMERGENCY

COOL

EMERGENCY

HEAT

STOP

MSY

EMERGENCY

COOL

STOP

OBH548D

MSZ-GE06NA MSZ-GE09NA MSZ-GE12NA MSZ-GE15NA MSZ-GE18NA MSZ-GE24NA

MSY-GE09NA MSY-GE12NA MSY-GE15NA MSY-GE18NA MSY-GE24NA

9-1. CAUTIONS ON TROUBLESHOOTING

1. Before troubleshooting, check the following

1) Check the power supply voltage.

2) Check the indoor/outdoor connecting wire for miswiring.

2. Take care of the following during servicing

1) Before servicing the air conditioner, be sure to turn OFF the unit first with the remote controller, and then after confirm-

ing the horizontal vane is closed, turn OFF the breaker and/or disconnect the power plug.

2) Be sure to turn OFF the power supply before removing the front panel, the cabinet, the top panel, and the P.C. board.

3) When removing the P.C. board, hold the edge of the board with care NOT to apply stress on the components.

4) When connecting or disconnecting the connectors, hold the of the connector housing. DO NOT pull the lead wires.

3. Troubleshooting procedure

1) First, check if the OPERATION INDICATOR lamp on the indoor unit is flashing ON and OFF to indicate an abnormality.

To make sure, check how many times the OPERATION INDICATOR lamp is flashing ON and OFF before starting ser-

vice work.

2) Before servicing check that the connector and terminal are connected properly.

3) When the P.C. board seems to be defective, check the copper foil pattern for disconnection and the components for

bursting and discoloration.

4) When troubleshooting, refer to 9-2, 9-3 and 9-4.

4. How to replace batteries

Weak batteries may cause the remote controller malfunction.

In this case, replace the batteries to operate the remote controller normally.

Lead wiring

Connector housing

RESET button

Insert the negative pole of the

batteries first. Check if the polarity

of the batteries is correct.

NOTE: 1. If RESET button is not pressed, the remote controller may not operate correctly.

2. This remote controller has a circuit to automatically reset the microcomputer when batteries are replaced.

This function is equipped to prevent the microcomputer from malfunctioning due to the voltage drop caused by

the battery replacement.

3. Do not use the leaking batteries.

Press RESET button with a thin instrument, and

then use the remote controller.

Remove the front lid and insert batteries.

Then reattach the front lid.

TROUBLESHOOTING

OBH548D

9-2. FAILURE MODE RECALL FUNCTION

Outline of the function

This air conditioner can memorize the abnormal condition which has occurred once.

Even though LED indication listed on the troubleshooting check table (9-4.) disappears, the memorized failure details can

be recalled.

1. Flow chart of failure mode recall function for the indoor/outdoor unit

Does upper lamp of OPERATION INDICATOR

lamp on the indoor unit blink at the interval of 0.5

seconds?

Blinks: Either indoor or outdoor unit is abnormal.

Beep is emitted at the same timing as the

blinking of upper lamp of OPERATION

INDICATOR lamp.

Indoor unit is normal.

But the outdoor unit might be abnormal because there are some abnor-

malities that cannot be recalled with this way.

Check if outdoor unit is abnormal according to the detailed outdoor unit

failure mode recall function.

Yes

The cause of abnormality cannot be found because the abnormality does not recur.

Setting up the failure mode recall function

Turn ON the power supply.

While pressing both OPERATION SELECT button and TOO COOL button on the

remote controller at the same time, press RESET button.

First, release RESET button.

Hold down the other two buttons for another 3 seconds. Con¿ rm that the indicators on

the LCD screen shown in the right ¿ gure are all displayed.

Then release the buttons.

Press OPERATE/STOP (ON/OFF) button of the remote controller (the set temperature is

displayed) with the remote controller headed towards the indoor unit.

Judgment of indoor/outdoor abnormality

Before blinking, does upper lamp of

OPERATION INDICATOR lamp stay ON for 3

seconds?

When it stays ON for 3 seconds (without beep):

The outdoor unit is abnormal.

The indoor unit is abnormal.

Check the blinking pattern, and identify the abnormal point by referring to the

indoor unit failure mode table. (Refer to 9-2.2)

Make sure to check at least two consecutive blinking cycles.

Releasing the failure mode recall function

Release the failure mode recall function by the following procedures.

Turn OFF the power supply and turn it ON again.

Press RESET button of the remote controller.

The outdoor unit is abnormal.

Check the blinking pattern, and identify the abnormal point by referring

to the outdoor unit failure mode table. (Refer to outdoor unit service

manual.)

Make sure to check at least two consecutive blinking cycles.

Repair the failure parts.

Deleting the memorized abnormal condition

After repairing the unit, recall the failure mode again according to "Setting up the failure mode recall

function" mentioned above.

Press OPERATE/STOP (ON/OFF) button of the remote controller (the set temperature is displayed)

with the remote controller headed towards the indoor unit.

Press EMERGENCY OPERATION switch so that the memorized abnormal condition is deleted.

Release the failure mode recall function according to "Releasing the failure mode recall function"

mentioned above.

Operational procedure

Yes

(Blinks)

(OFF)

NOTE: 1. Make sure to release the failure mode recall function after it is set up, otherwise the unit cannot operate properly.

2. If the abnormal condition is not deleted from the memory, the last abnormal condition is kept memorized.

2. Blinking pattern when the indoor unit is abnormal:

3.Blinking pattern when the outdoor unit is abnormal:

OFF

Beeps

Repeated cycle Repeated cycle

OFF

No beep Beeps

Repeated cycle

2.5-second OFF

Blinking at 0.5-

second interval

2.5-second OFF 3-second ON

Blinking at 0.5-

second interval

Beeps

Repeated cycle

2.5-second OFF

Blinking at 0.5-

second interval

No beep Beeps

Repeated cycle

2.5-second OFF 3-second ON

Blinking at 0.5-

second interval

Repeated cycle

Beeps

1 Regardless of normal or abnormal condition,

a short beep is emitted once the signal is re-

ceived.

E.g.: MSZ type

MSZ-GE06/09/12/15/18NA

MSY-GE09/12/15/18NA

MSZ-GE24NA

MSY-GE24NA

OBH548D

2. Indoor unit failure mode table

Upper lamp of OP-

ERATION INDICA-

TOR lamp

Abnormal point

(Failure mode)

Condition Remedy

Not lighted Normal — —

1-time À ash every

0.5-second

Room temperature

thermistor

The room temperature thermistor short or

open circuit is detected every 8 seconds dur-

ing operation.

Refer to the characteristics of the room temperature

thermistor (9-7.).

2-time À ash

2.5-second OFF

Indoor coil

thermistor

The indoor coil thermistor short or open circuit

is detected every 8 seconds during operation.

Refer to the characteristics of the main indoor coil ther-

mistor, the sub indoor coil thermistor (9-7.).

3-time À ash

2.5-second OFF

Serial signal

The serial signal from outdoor unit is not re-

ceived for a maximum of 6 minutes.

Refer to 9-6.

"How to check miswiring and serial

signal error".

11-time À ash

2.5-second OFF

Indoor fan motor

The rotational frequency feedback signal is

not emitted for 12 seconds after the indoor fan

motor is operated.

Refer to 9-6.

"Check of indoor fan motor".

12-time À ash

2.5-second OFF

Indoor control

system

It cannot properly read data in the nonvolatile

memory of the indoor electronic control P.C.

board.

Replace the indoor electronic control P.C. board.

NOTE: Blinking patterns of this mode differ from the ones of TROUBLESHOOTING CHECK TABLE (9-4.).

OBH548D

9-3. INSTRUCTION OF TROUBLESHOOTING

Indoor unit oper-

ates.

Outdoor unit

does not operate.

If blinking of OPERATION INDI-

CATOR lamp cannot be checked,

it can be checked with failure

mode recall function.

Indoor unit operates.

Outdoor unit does

not operate normally.

Indoor unit does

not receive the

signal from re-

mote controller.

OPERATION INDICATOR

lamp on the indoor unit is

À ashing ON and OFF.

Outdoor unit

operates only

in Test Run

operation.

Outdoor unit

does not

operate even

in Test Run

operation.

Unit does not

operate nor-

mal operation

in COOL or

HEAT mode.

Indoor unit

operates, when

EMERGENCY

OPERATION

switch is pressed.

Indoor unit does

not operate, when

EMERGENCY

OPERATION

switch is pressed.

Check room

temperature

thermistor.

Refer to 9-7.

"Test point

diagram and

voltage".

Refer to "How

to check

inverter/com-

pressor".

Refer to

"Check of R.V.

coil".

Refer to 9-6.

"Check of remote

controller and

indoor elec-

tronic control P.C.

board".

1. Check indoor/out-

door connecting wire.

(Check if the power is

supplied to the indoor

unit.)

2. Refer to 9-6.

"Check

of indoor P.C. board

and indoor fan motor".

Upper lamp

Flash ON

and OFF at

0.5-second

intervals

Cause:

Indoor/Outdoor

unit

• Miswiring or

trouble of

serial signal.

Upper lamp

2-time À ash

Cause:

Indoor unit

• Trouble

of room

temperature

/ indoor coil

thermistor.

Upper lamp

3-time À ash

Cause:

Indoor unit

• Trouble of

indoor fan

motor.

Upper lamp

4-time À ash

Cause:

Indoor unit

• Trouble

of indoor

unit control

system.

Upper lamp

5-time À ash

Cause:

Outdoor unit

• Outdoor

power sys-

tem abnor-

mality.

Upper lamp

6-time À ash

Cause:

Outdoor unit

• Trouble of

thermistor in

outdoor unit.

Upper lamp

7-time À ash

Cause:

Outdoor unit

• Trouble of

outdoor con-

trol system.

Upper lamp

14-time À ash

Cause:

Outdoor unit

• Other ab-

normality

Start

Refer to 9-6.

"How to

check mis-

wiring and

serial signal

error".

Check room

temperature

thermistor

and indoor

coil thermis-

tor. Refer

to 9-7."Test

point diagram

and voltage".

Refer to 9-6.

"Check of

indoor fan

motor".

Replace the

indoor elec-

tronic control

P.C. board.

Refer to

"How to

check

inverter/com-

pressor".

Refer to

"Check of

outdoor ther-

mistors".

Replace the

inverter P.C.

board or

the outdoor

electronic

control P.C.

board.

Check "Flow

chart of the

detailed

outdoor unit

failure mode

recall func-

tion."

"Test Run operation" means the

operation within 30 minutes af-

ter EMERGENCY OPERATION

switch is pressed.

Refer to outdoor unit service manual.

OBH548D

9-4. TROUBLESHOOTING CHECK TABLE

Before taking measures, make sure that the symptom reappears for accurate troubleshooting.

When the indoor unit has started operation and detected an abnormality of the following condition (the first detection after the

power ON), the indoor fan motor turns OFF and OPERATION INDICATOR lamp flashes.

OPERATION INDICATOR

Lighted

Blinking

Not lighted

No.

Abnormal

point

Operation indicator lamp Symptom Condition Remedy

Miswiring

or serial

signal

Upper lamp À ashes.

0.5-second ON

0.5-second OFF

Indoor unit and

outdoor unit do

not operate.

The serial signal from the outdoor unit is not

received for 6 minutes.

•

Refer to 9-6.

"How to check

miswiring and serial signal er-

ror".

Indoor coil

thermistor

Upper lamp À ashes.

2-time À ash

2.5-second OFF

The indoor coil or the room temperature ther-

mistor is short or open circuit.

•

Refer to the characteristics of

indoor coil thermistor, and the

room temperature thermistor

(9-7.).

Room tem-

perature

thermistor

Indoor fan

motor

Upper lamp À ashes.

3-time À ash

2.5-second OFF

The rotational frequency feedback signal is

not emitted during the indoor fan operation.

•

Refer to 9-6.

"Check of in-

door fan motor".

Indoor con-

trol system

Upper lamp À ashes.

4-time À ash

2.5-second OFF

It cannot properly read data in the nonvolatile

memory of the indoor electronic control P.C.

board.

•

Replace the indoor electronic

control P.C. board.

Outdoor

power sys-

tem

Upper lamp À ashes.

5-time À ash

2.5-second OFF

It consecutively occurs 3 times that the com-

pressor stops for overcurrent protection or

start-up failure protection within 1 minute after

start-up.

•

Refer to "How to check of in-

verter/compressor".

Refer to outdoor unit service

manual

•

Check the stop valve.

Outdoor

thermistors

Upper lamp À ashes.

6-time À ash

2.5-second OFF

The outdoor thermistors short or open circuit

during the compressor operation.

•

Refer to "Check of outdoor

thermistor".

Refer to outdoor unit service

manual.

Outdoor

control sys-

tem

Upper lamp À ashes.

7-time À ash

2.5-second OFF

It cannot properly read data in the nonvolatile

memory of the inverter P.C. board or the out-

door electronic control P.C. board.

•

Replace the inverter P.C. board

or the outdoor electronic control

P.C. board.

Refer to outdoor unit service

manual.

Other ab-

normality

Upper lamp À ashes.

14-time À ash

2.5-second OFF

An abnormality other than above mentioned

is detected.

•

Check the stop valve.

•

Con¿ rm the abnormality in de-

tail using the failure mode recall

function for outdoor unit.

Outdoor

control sys-

tem

Upper lamp lights up.

Outdoor unit

does not oper-

ate

It cannot properly read data in the nonvolatile

memory of the inverter P.C. board or the out-

door electronic control P.C. board.

•

Check the blinking pattern of

the LED on the inverter P.C.

board or the outdoor electronic

control P.C. board.

OBH548D

OPERATION INDICATOR

No.

Abnormal

point

Operation indicator lamp Symptom Condition

Remedy

MXZ type

Operation

mode

setting

Upper lamp lights and lower lamp À ashes.

2.5-second OFF

Outdoor unit

operates but

indoor unit does

not operate.

The operation mode of the each indoor unit

is differently set to COOL (includes DRY) and

HEAT at the same time, the operation mode

of the indoor unit that has operated at ¿ rst has

the priority.

•

Unify the operation mode.

Refer to outdoor unit service

manual.

9-5. TROUBLE CRITERION OF MAIN PARTS

MSZ-GE06NA MSZ-GE09NA MSZ-GE12NA MSZ-GE15NA MSZ-GE18NA MSZ-GE24NA

MSY-GE09NA MSY-GE12NA MSY-GE15NA MSY-GE18NA MSY-GE24NA

Part name Check method and criterion Figure

Room temperature

thermistor (RT11)

Indoor coil thermistor

(RT12, RT13)

Measure the resistance with a tester.

Refer to 9-7. "Test point diagram and voltage", 2 or 3. "Indoor electronic

control P.C. board", for the chart of thermistor.

Indoor fan motor (MF) Check 9-6.

MSZ-GE06/09/12/15/18NA

MSY-GE09/12/15/18NA

Vane motor (MV)

Measure the resistance between the terminals with a tester.

(Temperature: 50 - 86°F (10 - 30°C))

Color of the lead wire Normal

RED - BLK 223 - 268 

MSZ-GE24NA

MSY-GE24NA

Horizontal vane motor

(MV1)

Vertical vane motor

(MV2)

Measure the resistance between the terminals with a tester.

(Part temperature 50 ~ 86°F (10 ~ 30°C))

Color of the lead wire Normal

Horizontal vane motor (MV1)

RED-BLK

313 ~ 375 

Vertical vane motor (MV2) 268 ~ 322 

BLK

RED

BLK

ROTOR

BLK

RED

BLK

ROTOR

OBH548D

A Check of indoor fan motor

9-6. TROUBLESHOOTING FLOW

The indoor fan motor error has occurred, and the indoor fan does not operate.

Turn OFF the power supply.

Is there any foreign matter that interferes

the rotation of the line À ow fan?

Yes

Remove the foreign matter and

adjust the line À ow fan.

Pay enough attention to the high voltage on the fan motor connector.

Turn ON the power supply, wait 5 seconds or more, and then press

EMERGENCY OPERATION switch.

Measure the supply voltage as follows within 12 seconds after EMER-

GENCY OPERATION switch is pressed.

If more than 12 seconds passes, turn OFF the power supply and turn it

ON again, then measure the voltage.

1. Measure the voltage between CN211

(+) and (–).

2. Measure the voltage between CN211

(+) and (–).

3. Measure the voltage between CN10A

(+) and JPG(GND)(–).

If more than 12 seconds passes after EMERGENCY OPERATION switch

is pressed, the voltage measured at 2. above goes 0 VDC although the

indoor P.C. board is normal.

Does the voltage between CN211

(+) and

(–) on the power P.C. board

rise to the range of 2 to 6 VDC within

12 seconds after EMERGENCY

OPERATION switch is pressed?

Replace the indoor fan motor.

Yes

The indoor fan motor error has occurred, and the indoor fan repeats "12-second ON and 30-second OFF" 3 times, and then stops.

Measure the voltage between CN211

(+) and (–) while the fan motor is

rotating.

Replace the indoor power

P.C. board and the indoor

terminal P.C. board.

Is it unchanged holding

0 or 15 VDC?

(Changed)

Yes

(Unchanged)

Measure the voltage CN10A (+)

and JPG (GND)(–) on the indoor

electronic control P.C board when

the fan motor is rotaring.

Replace the indoor fan motor.

Is there 294/325 VDC

between CN211

(+)

and

(–) ?

Yes

Does the voltage between CN10A

(+) and JPG (GND)(–) on the indoor

electronic control P.C. board fall to

2 V or less within 12 seconds after

EMERGENCY OPERATION switch is

pressed?

Replace the indoor electronic

control P.C. board.

Yes

Replace the indoor power P.C.

board and the indoor terminal P.C.

board.

Is it unchanged holding

0 or 15 VDC?

(Changed)

Yes

(Unchanged)

Replace the indoor

electronic control P.C.

board.

MSZ-GE06/09/12/15/18NA

MSY-GE09/12/15/18NA

OBH548D

MSZ-GE24NA

MSY-GE24NA

The indoor fan motor error has occurred, and the indoor fan does not operate.

Turn OFF the power supply.

Is there any foreign matter that interferes

the rotation of the line À ow fan?

Yes

Remove the foreign matter and

adjust the line À ow fan.

Pay enough attention to the high voltage on the fan motor connector.

Turn ON the power supply, wait 5 seconds or more, and then press

EMERGENCY OPERATION switch.

Measure the supply voltage as follows within 12 seconds after EMER-

GENCY OPERATION switch is pressed.

If more than 12 seconds passes, turn OFF the power supply and turn it

ON again, then measure the voltage.

1. Measure the voltage between CN211

(+) and (–).

2. Measure the voltage between CN211

(+) and (–).

If more than 12 seconds passes after EMERGENCY OPERATION switch

is pressed, the voltage measured at 2. above goes 0 V DC although the

indoor P.C. board is normal.

Does the voltage between CN211

(+) and

(–) on the indoor electronic

control P.C. board rise to the range

of 3 to 6 VDC within 12 seconds after

EMERGENCY OPERATION switch is

pressed?

Replace the indoor fan motor.

Yes

The indoor fan motor error has occurred, and the indoor fan repeats "12-second ON and 30-second OFF" 3 times, and then stops.

Measure the voltage between CN211

(+) and (–) while the fan motor is

rotating.

Replace the indoor electronic control P.C.

board and the indoor terminal P.C. board.

Is it unchanged holding

0 or 15 VDC?

(Changed)

Yes

(Unchanged)

Replace the indoor fan motor.

Is there 294/325 VDC

between CN211

(+)

and

(–) ?

Yes

Replace the indoor

electronic control P.C.

board.

Replace the indoor electronic control

P.C. board.

OBH548D

B Check of remote controller and indoor electronic control P.C. board

Check if the remote controller is exclusive for this air conditioner.

Does the unit operate with the remote

controller?

Yes

(Not clear)

Replace the batteries. (Refer to 9-1.4.)

Press OPERATE/STOP (ON/OFF)

button on the remote controller.

Is LCD display on the remote controller

visible?

Remove the batteries, then set them back

and press RESET button. (Refer to 9-1.4.)

Check if the unit operates with the remote

controller.

Yes

Turn ON a radio to AM and press OP-

ERATE/STOP (ON/OFF) button on the

remote controller.

Is noise heard from radio?

Yes

Replace the remote controller.

Are there any À uorescent lights of

inverter or rapid-start type within the

range of 3.28 ft.(1m)?

Yes

• Reinstall the unit away from lights.

• Attach a ¿ lter on receiving part.

Replace the indoor electronic control

P.C. board. (Including the receiver)

MSZ-GE24NA MSY-GE24NA

Does the unit operate with the remote

controller?

Yes

(Not clear)

Replace the batteries. (Refer to 9-1.4.)

Press OPERATE/STOP (ON/OFF)

button on the remote controller.

Is LCD display on the remote controller

visible?

Remove the batteries, then set them back

and press RESET button. (Refer to 9-1.4.)

Check if the unit operates with the remote

controller.

Yes

Turn ON a radio to AM and press OP-

ERATE/STOP (ON/OFF) button on the

remote controller.

Is noise heard from radio?

Yes

Replace the remote controller.

Are there any À uorescent lights of

inverter or rapid-start type within the

range of 3.28 ft.(1m)?

Yes

• Reinstall the unit away from lights.

• Attach a ¿ lter on receiving part.

Measure the voltage between power moni-

tor receiver SW P.C. board connector CN20A

No.2(+) and No.3(-) when the remote controller

button is pressed. (Refer to 9-7.3.)

Is the voltage approximately 4 VDC?

Yes

Replace indoor electronic control P.C.

board.

Replace power monitor receiver SW P.C. board.

MSZ-GE06/09/12/15/18NA

MSY-GE09/12/15/18NA

1 Look at the image of the signal transmitting section of

the remote controller through the monitor of a digital

camera or a camera phone. It is normal if the LED of

the signal transmitting section lights up when the OP-

ERATE/STOP (ON/OFF) button on the remote control-

ler is pressed. However, it may be dif¿ cult to see the

illuminated LED of the signal transmitting section with a

smartphone camera.

2 If the inverter À uorescent light is turned on when the

room is cool, the unit may have dif¿ culty receiving the

signal from the remote controller or may not be able to

operate with it; if the inverter À uorescent light is turned

on when the room is warm, the unit may be able to

operate with the remote controller.

1 Look at the image of the signal transmitting section of

the remote controller through the monitor of a digital

camera or a camera phone. It is normal if the LED of

the signal transmitting section lights up when the OP-

ERATE/STOP (ON/OFF) button on the remote control-

ler is pressed. However, it may be dif¿ cult to see the

illuminated LED of the signal transmitting section with a

smartphone camera.

2 If the inverter À uorescent light is turned on when the

room is cool, the unit may have dif¿ culty receiving the

signal from the remote controller or may not be able to

operate with it; if the inverter À uorescent light is turned

on when the room is warm, the unit may be able to

operate with the remote controller.

OBH548D

C Check of indoor P.C. board and indoor fan motor

Turn OFF the power supply.

Remove indoor fan motor connector CN211

from indoor power P.C. board and vane

motor connector CN151 from the indoor

electronic control P.C. board and turn ON

the power supply.

Does the unit operate with the remote

controller?

Does OPERATION INDICATOR lamp light

up by pressing EMERGENCY OPERATION

switch?

Yes

Measure the resistance of indoor fan

motor.

(Refer to 9-5.)

Short circuit:

Replace the indoor fan motor.

Turn OFF the power supply.

Check both “parts side” and “pat-

tern side” of the indoor terminal P.C.

board visually.

Replace the varistor (NR11)

and fuse (F11). 3

Are the varistor (NR11)

burnt and the fuse (F11)

blown?

Yes

Be sure to check both the fuse

and the varistor in any case.

Is the fuse (F11) blown

only?

Measure the resistance between

CN211

(+) and (-) of indoor fan

motor connector.

1, 2

Yes

Is the resistance 1M or more?

Replace the fuse (F11) and the

indoor fan motor.

Replace the fuse (F11).

Measure the resistance of resistor

(R111) on the indoor power P.C.

board.

Is the resistance of

resistor (R111) approxi-

mately 4 ?

Replace the indoor

power P.C. board, the

indoor terminal P.C.

board and the indoor fan

motor.

Replace the indoor electronic control P.C. board.

Measure the resistance of the vane

motor coil.

(Refer to 9-5.)

Short circuit:

Replace the vane motor and the indoor

electronic control P.C. board.

1. The fan motor connector's lead wire is red,

whereas

is black.

2. Connect "+" of the tester to fan motor connector's

lead wire, and “-” to lead wire, otherwise the

resistance cannot be measured properly.

3. Please replace the fuse after removing the indoor

terminal P.C. board from the electrical box.

Is there approximately 5 VDC between

5 V (+) and JPG (GND) (-) of the

indoor electronic control P.C. board?

Is there approximately 9 to 13 VDC

between 12 V (+) and JPG (GND) (-)

of the indoor electronic control P.C.

board?

Are connector CN10A on the

indoor electronic control P.C.

board or lead wires discon-

nected?

Yes

Replace the indoor fan motor.

Yes

Connect the connector or repair

disconnection.

Yes

Indoor electronic control

P.C. board

JPG (GND)

CN10A

12 VDC

5 VDC

Indoor terminal

P.C. board

Indoor power P.C. board

Fuse

(F11)

Varistor

(NR11)

CN211

R111

MSZ-GE06/09/12/15/18NA

MSY-GE09/12/15/18NA

OBH548D

CN211

R111

Indoor electronic

control P.C.Board

Indoor terminal

P.C. board

Fuse

(F11)

Varistor

(NR11)

Yes

1. The fan motor connector's lead wire is red, whereas is black.

2. Connect "+" of the tester to fan motor connector's lead

wire, and "-" to lead wire, otherwise the resistance cannot be

measured properly.

3. Please replace the fuse after removing the indoor terminal

P.C. board from the electrical box.

Yes

Does the unit operate with the remote controller?

Does OPERATION INDICATOR lamp light up by

pressing EMERGENCY

OPERATION switch?

Turn OFF the power supply.

Remove indoor fan motor connector CN211 and

vane motor connector CN151 from the indoor electronic

control P.C. board and turn ON the power supply.

Measure the resistance of the horizontal vane

motor coil.

Refer to 9-5.

Measure the resistance between CN211

and of the indoor fan motor connector.

Short circuit:

Replace the indoor fan motor.

Short circuit:

Replace the horizontal vane motor and the indoor

electronic control P.C. board.

Turn OFF the power supply.

Check both “parts side” and “pattern

side” of the indoor electronic control P.C.

board visually.

Replace the varistor (NR11) and fuse (F11). 3

Are the varistor (NR11) burnt

and the fuse (F11) blown?

Be sure to check both the fuse

and the varistor in any case.

Yes

Is the fuse (F11) blown only?

Yes

Is the resistance 1M

or more?

Measure the resistance between

CN211 (+) and (-) of the indoor

fan motor connector. 1, 2

Replace the fuse (F11). 3

Replace the fuse (F11) and the indoor fan motor. 3

Is the resistance

approximately 4?

Measure the resistance of cement

resistor R111 on the indoor electronic

control P.C. board.

Replace the indoor electronic control P.C. board.

Replace the indoor electronic control P.C. board

and the indoor fan motor.

Yes

MSZ-GE24NA

MSY-GE24NA

OBH548D

D How to check miswiring and serial signal error

• Turn OFF inverter-controlled lighting

equipment.

• Turn OFF the power supply and then

turn ON again.

• Press EMERGENCY OPERATION

switch.

Is serial signal

error indicated 6

minutes later?

Yes

• Reinstall

either the unit

or the light

away from

each other.

• Attach a ¿ lter

on remote

control receiv-

ing section

of the indoor

unit.

Replace the indoor power

P.C. board and the indoor

terminal P.C. board

Turn OFF the power supply.

Is there rated voltage in the power supply?

Yes

Turn ON the power supply.

Check the power supply.

Is there rated voltage between outdoor terminal block S1 and S2?

Check the wiring.

Press EMERGENCY OPERATION switch once.

Does the OPERATION INDICATOR lamp light

up? <Con¿ rmation of the power to the indoor

unit>

Is serial signal error indicated 6 minutes later?

Yes

Is there any miswiring, poor

contact, or wire disconnec-

tion of the indoor/outdoor

connecting wire?

Yes

Correct them.

Turn OFF the power supply.

Check once more if the indoor/outdoor

connecting wire is not miswiring.

Bridge the outdoor terminal block S2 and

S3.

1. Miswiring may damage indoor electronic control P.C.

board during the operation.

Be sure to con¿ rm the wiring is correct before the opera-

tion starts.

Turn ON the power supply.

Does the LED on the inverter P.C. board or the outdoor electronic control P.C.

board repeat "3.6-second-OFF and 0.8-second-ON quick blinking"?

Yes

(Lighted

or not

lighted)

Replace the inverter P.C. board or the outdoor

electronic control P.C. board. 2

2. Be careful of the residual voltage of smoothing

capacitor.

Is there amplitude of 10 to 20 VDC between indoor terminal block S2

and S3? <Con¿ rmation of serial signal>

Yes

Check the wiring

If there are any error of the indoor/outdoor connecting wire:

such as the damage of the wire, intermediate connection,

and/or poor contact to the terminal block, replace the indoor/

outdoor connecting wire.

Is there 2 VDC or less between CN10A (+)

and JPG (GND)(-) on the indoor electronic

control P.C. board?

Yes

3. Be sure to check this within 3 minutes after turning ON.

After 3 minutes, LED blinks 6 times. Even when the

inverter P.C. board or the outdoor electronic control P.C.

board is normal, LED blinks 6 times after 3 minutes.

(Except for outdoor unit of multi system type)

Is there 2 VDC or less between

CN10A

(+) and JPG (GND)(-) on

the indoor electronic control P.C.

board?

Is there 2 VDC or less between

CN10A

(+) and JPG (GND)(-) on

the indoor electronic control P.C.

board?

Replace the indoor elec-

tronic control P.C. board.

No Yes No

Yes

Is the bus-bar voltage of the inverter P.C. board or the outdoor electronic control P.C. board normal? (Refer

to "TEST POINT DIAGRAM AND VOLTAGE" in the outdoor service manual.)

Yes

Check of power supply.

(Refer to the outdoor

service manual.)

Turn OFF the power supply.

Remove the bridge between outdoor terminal block S2 and S3.

Turn ON the power supply.

Is there rated voltage between indoor terminal block S1 and S2?

<Con¿ rmation of power voltage>

Yes

MSZ-GE06/09/12/15/18NA

MSY-GE09/12/15/18NA

OBH548D

• Turn OFF inverter-controlled lighting

equipment.

• Turn OFF the power supply and then

turn ON again.

• Press EMERGENCY OPERATION

switch.

Is serial signal

error indicated 6

minutes later?

Yes

• Reinstall

either the unit

or the light

away from

each other.

• Attach a ¿ lter

on remote

control receiv-

ing section

of the indoor

unit.

Turn OFF the power supply.

Is there rated voltage in the power supply?

Yes

Turn ON the power supply.

Check the power supply.

Is there rated voltage between outdoor terminal block S1 and S2?

Check the wiring.

Press EMERGENCY OPERATION switch once.

Does the OPERATION INDICATOR lamp light

up? <Con¿ rmation of the power to the indoor

unit>

Yes

Is serial signal error indicated 6 minutes

later?

Yes

Is there any miswiring,

poor contact, or wire

disconnection of the

indoor/outdoor connect-

ing wire?

Yes

Correct them.

Turn OFF the power supply.

Check once more if the indoor/outdoor

connecting wire is not miswiring.

Bridge the outdoor terminal block S2 and

S3.

1. Miswiring may damage indoor electronic control P.C.

board during the operation.

Be sure to con¿ rm the wiring is correct before the opera-

tion starts.

Turn ON the power supply.

Does the LED on the inverter P.C. board or the outdoor electronic control P.C.

board repeat "3.6-second-OFF and 0.8-second-ON quick blinking"?

Yes

(Lighted

or not

lighted)

Replace the inverter P.C. board or the outdoor

electronic control P.C. board.

2. Be careful of the residual voltage of smoothing

capacitor.

Turn OFF the power supply.

Remove the bridge between outdoor terminal block S2 and S3.

Yes

3. Be sure to check this within 3 minutes after turning ON.

After 3 minutes, LED blinks 6 times. Even when the

inverter P.C. board or the outdoor electronic control P.C.

board is normal, LED blinks 6 times after 3 minutes.

(Except for outdoor unit of multi system type)

Is the bus-bar voltage of the inverter P.C. board or the outdoor electronic control P.C. board normal? (Refer

to "TEST POINT DIAGRAM AND VOLTAGE" in the outdoor service manual.)

Yes

Replace the indoor electronic control P.C. board.

MSZ-GE24NA

MSY-GE24NA

OBH548D

E Electromagnetic noise enters into TV sets or radios

Yes

Is the unit grounded?

Ground the unit.

Yes

Is the distance between the antennas

and the indoor unit within 9.91 ft.(3 m),

or is the distance between the antennas

and the outdoor unit within 9.91 ft.(3 m)?

Extend the distance between the antennas and

the indoor unit, and/or the antennas and the

outdoor unit.

Is the distance between the TV sets or radios

and the indoor unit within 3.28 ft.(1 m), or is

the distance between the TV sets or radios

and the outdoor unit within 9.91 ft.(3 m)?

Yes

Extend the distance between the TV sets and/or

radios and the indoor unit, or the TV sets or

radios and the outdoor unit.

Are the antennas damaged?

Is the coaxial cable damaged?

Is there any poor contact in the anten-

na wiring?

Yes

Replace or repair the antenna.

Replace or repair the coaxial cable.

Is the indoor/outdoor connecting wire

of the air conditioner and the wiring of

the antennas close?

Yes

Extend the distance between the indoor/outdoor

connecting wire of the air conditioner and the wir-

ing of the antennas.

Even if all of the above conditions are ful¿ lled, the electromagnetic noise may enter, depending on the electric ¿ eld strength

or the installation condition (combination of speci¿ c conditions such as antennas or wiring).

Check the followings before asking for service.

1. Devices affected by the electromagnetic noise

TV sets, radios (FM/AM broadcast, shortwave)

2. Channel, frequency, broadcast station affected by the electromagnetic noise

3. Channel, frequency, broadcast station unaffected by the electromagnetic noise

4. Layout of:

indoor/outdoor unit of the air conditioner, indoor/outdoor wiring, grounding wire, antennas, wiring from antennas, receiv-

5. Electric ¿ eld intensity of the broadcast station affected by the electromagnetic noise

6. Presence or absence of ampli¿ er such as booster

7. Operation condition of air conditioner when the electromagnetic noise enters in

1) Turn OFF the power supply once, and then turn ON the power supply. In this situation, check for the electromagnetic

noise.

2) Within 3 minutes after turning ON the power supply, press OPERATE/STOP (ON/OFF) button on the remote controller

for power ON, and check for the electromagnetic noise.

3) After a short time (3 minutes later after turning ON), the outdoor unit starts running. During operation, check for the

electromagnetic noise.

4) Press OPERATE/STOP (ON/OFF) button on the remote controller for power OFF, when the outdoor unit stops but the

indoor/outdoor communication still runs on. In this situation, check for the electromagnetic noise.

OBH548D

1. Indoor power P.C. board, Indoor terminal P.C. board

9-7. Test point diagram and voltage

Indoor terminal P.C. board Indoor power P.C. board

Please replace the fuse after removing the indoor terminal P.C. board from the electrical box.

Fuse (F11)( )

Varistor (NR11)

Terminal

block

Connector to indoor electronic

control P.C. board (CN20A)

5 VDC

12 VDC GND

Resistor (R111)

Indoor fan motor

(CN211)

294/325 VDC

(–) GND (high-

voltage DC)

15 VDC

(+)3-6 VDC

(+)0-6 V

Timer short mode point JPG JPS

(Refer to 7-1.)

Room temperature thermistor RT11 (CN111)

Indoor coil thermistor RT12, RT13 (CN112)

Vane motor (CN151)

Connector to

Indoor power P.C. board

(CN10A)

12 VDC

5 VDC

To disable "Auto restart function",

solder the Jumper wire to JR07.

(Refer to 7-3.)

Emergency operation

switch (E.O.SW) (SW1)

2. Indoor electronic control P.C. board

GND

Room temperature thermistor (RT11)

Indoor coil thermistor (RT12, RT13)

Temperature (°F)

Resistance (k)

50 68 86 104 122 140

MSZ-GE06/09/12/15/18NA/NA-

MSY-GE09/12/15/18NA/NA-

MSZ-GE06/09/12/15/18NA MSY-GE09/12/15/18NA

OBH548D

Timer short mode point JPG JPS

(Refer to 7-1.)

Room temperature thermistor RT11 (CN111)

Indoor coil thermistor RT12, RT13 (CN112)

Vane motor (CN151)

Connector to

Indoor power P.C. board

(CN10A)

12 VDC

5 VDC

To disable "Auto restart function",

solder the Jumper wire to JR07.

(Refer to 7-3.)

Emergency operation

switch (E.O.SW) (SW1)

Indoor electronic control P.C. board

GND

Room temperature thermistor (RT11)

Indoor coil thermistor (RT12, RT13)

Temperature (°F)

Resistance (k)

50 68 86 104 122 140

MSZ-GE06/09/12/15/18NA-

MSY-GE09/12/15/18NA-

OBH548D

Indoor power P.C. board, Indoor terminal P.C. board

Indoor terminal P.C. board Indoor power P.C. board

Please replace the fuse after removing the indoor terminal P.C. board from the electrical box.

Fuse (F11)( )

Varistor (NR11)

Terminal

block

Connector to indoor electronic

control P.C. board (CN20A)

5 VDC

12 VDCGND

Resistor (R111)

Indoor fan motor

(CN211)

(+)0-6 V

(+)3-6 VDC

15 VDC

(–) GND (high-

voltage DC)

294/325 VDC

Timer short mode point JPG JPS

(Refer to 7-1.)

Room temperature thermistor RT11 (CN111)

Indoor coil thermistor RT12, RT13 (CN112)

Vane motor (CN151)

Connector to

Indoor power P.C. board

(CN10A)

12 VDC

5 VDC

To disable "Auto restart function",

solder the Jumper wire to JR07.

(Refer to 7-3.)

Emergency operation

switch (E.O.SW) (SW1)

Indoor electronic control P.C. board

GND

Room temperature thermistor (RT11)

Indoor coil thermistor (RT12, RT13)

Temperature (°F)

Resistance (k)

50 68 86 104 122 140

MSZ-GE06/09/12/15/18NA-

MSY-GE09/12/15/18NA-

MSZ-GE06/09/12/15/18NA-

MSY-GE09/12/15/18NA-

OBH548D

MSZ-GE24NA

3. Indoor terminal P.C. board, Indoor electronic control P.C. board, Power monitor receiver SW P.C. board

Room temperature thermistor (RT11)

Indoor coil thermistor (RT12, RT13)

Temperature (°F)

Resistance (k)

50 68 86 104 122 140

Please replace the fuse after removing the indoor terminal P.C. board from the electrical box.

Power monitor receiver SW P.C. board

Emergency

operation switch

(E.O. SW)

(SW1)

CN20A

(–)

(+)

(Refer to 9-6.

JR07

JR77

Indoor terminal P.C. board Indoor electronic control P.C. board

Indoor fan motor

(CN211)

325 VDC

(–) GND

(high-voltage DC)

15 VDC

(+)3-6 VDC

(+)0 or 15 VDC

Resistor

(R111)

Timer short mode point

JPG JPS (Refer to 7-1.)

Varistor

(NR11)

Terminal

block

To disable "Auto restart function",

solder the Jumper wire to JR07.

(Refer to 7-3.)

Vane motor

(CN151, CN152)

5 VDC

12 VDC

Room temperature

thermistor RT11

(CN111)

Indoor coil thermistor

RT12, RT13

(CN112)

Fuse

(F11)(

)

OBH548D

MSY-GE24NA

Indoor terminal P.C. board, Indoor electronic control P.C. board, Power monitor receiver SW P.C. board

JR24

JRRE

JRDFT

JR07

JRPRH

JR19

JRTU

JR01

Indoor terminal P.C. board Indoor electronic control P.C. board

Room temperature thermistor (RT11)

Indoor coil thermistor (RT12, RT13)

Temperature (°F)

Resistance (k)

50 68 86 104 122 140

Please replace the fuse after removing the indoor terminal P.C. board from the electrical box.

Power monitor receiver SW P.C. board

Fuse

(F11)(

)

Varistor

(NR11)

Terminal

block

Indoor fan motor

(CN211)

294/325 VDC

(–) GND

(high-voltage DC)

15 VDC

(+)3-6 VDC

(+)0 or 15 VDC

Resistor

(R111)

To disable "Auto restart function",

solder the Jumper wire to JR07. (Refer to 7-3.)

Timer short mode point

JPG JPS (Refer to 7-1.)

Vane motor

(CN151,CN152)

5 VDC

12 VDC

Room temperature

thermistor RT11

(CN111)

Indoor coil thermistor

RT12, RT13

(CN112)

Emergency

operation switch

(E.O. SW)

(SW1)

CN20A

(–)

(+)

(Refer to 9-6.

OBH548D

10-1. MSZ-GE06NA MSZ-GE09NA MSZ-GE12NA MSZ-GE15NA MSZ-GE18NA

MSY-GE09NA MSY-GE12NA MSY-GE15NA MSY-GE18NA

NOTE: Turn OFF the power supply before disassembly.

OPERATING PROCEDURE PHOTOS

1. Removing the panel

(1) Remove the horizontal vanes.

(2) Remove the screw caps of the panel. Remove the

screws of the panel.

(3) Unhook the lower part (

) of the panel.

(4) Hold the lower part of both ends of the panel and pull

slightly toward you, and then remove the panel by

pushing

it upward.

Photo 1

(1) Slide the sleeve and check if there is a locking lever or not. (2) The terminal with this connector has the

locking mechanism.

Slide the sleeve.

Pull the terminal while

pushing the locking

lever.

Hold the sleeve, and

pull out the terminal

slowly.

Connector

Sleeve

Locking lever

<"Terminal with locking mechanism" Detaching points>

The terminal which has the locking mechanism can be detached as shown below.

There are two types (refer to (1) and (2)) of the terminal with locking mechanism.

The terminal without locking mechanism can be detached by pulling it out.

Check the shape of the terminal before detaching.

Screws of the panel

Front panel

Horizontal vanes

DISASSEMBLY INSTRUCTIONS

OBH548D

OPERATING PROCEDURE PHOTOS

2. Removing the indoor electronic control P.C.

board and the room temperature thermistor

(1) Remove the panel (Refer to 1.) and the corner box.

(2) Remove the screw of the V.A. clamp and the V.A.

clamp.

(3) Loosen the screw of the indoor/outdoor connecting

wire and remove the indoor/outdoor connecting wire.

(4) Remove the screw of the electrical cover and the

electrical cover.

(5) Open the indoor electronic control P.C. board holder (to

right side)

(6) Disconnect the following connectors:

CN112 (Indoor coil thermistor)

CN151 (Vane motor)

CN10A (To the indoor power P.C. board)

(7) Unhook the catches of the indoor electronic control

P.C. board holder from the nozzle and the electrical

box (right side).

(8) Remove the indoor electronic control P.C. board hold-

er from the conduit cover.

(9) Remove the room temperature thermistor from the

hook of the indoor electronic control P.C. board hold-

er.

(10)

Open the back side of the indoor electronic control P.C.

board holder, and remove the indoor electronic con-

trol P.C. board.

(11)

Remove the room temperature thermistor from the

indoor electronic control P.C. board.

Photo 2

Photo 3

Photo 4

3. Removing the indoor power P.C. board, the

indoor terminal P.C. board, and the electrical

box

(1) Remove the panel (Refer to 1.) and the corner box.

(2) Remove the indoor/outdoor connecting wire and the

indoor electric control P.C. board holder. (Refer to 2

(2)-(8).).

(3) Remove the screw of the conduit cover and the con-

duit cover.

(4) Remove the screw of the conduit plate and the con-

duit plate.

(5) Remove the ground wire connected to the indoor heat

exchanger from the electrical box.

(6) Remove the screw fixing the electrical box.

(7) Unhook first the lower, then the upper catches of the

electrical box, and pull out the electrical box.

(8) Disconnect all the connectors on the indoor power P.C.

board and unhook all lead wires.

(9) Remove the screw of terminal block on the indoor ter-

minal P.C. board.

(10)

Remove the indoor power P.C. board and the indoor

terminal P.C. board.

Lower catch

Indoor terminal

P.C. board

Terminal block

Indoor power

P.C. board

Screw of the

electrical box

Catch of indoor electronic

control P.C. board holder

Upper catch

Screw of the

V.A. clamp

Indoor electronic

control

P.C. board holder

Screw of the

electrical cover

Catch of indoor electronic

control P.C. board holder

Electrical box

Ground wire

Screws of the

conduit plate

Screw of the

conduit cover

OBH548D

OPERATING PROCEDURE PHOTOS

4. Removing the nozzle assembly

(1) Remove the panel (Refer to 1.) and the corner box.

(2) Remove the indoor/outdoor connecting wire (Refer to

2 (2)-(7).).

(3) Remove the indoor electronic control P.C. board hold-

er.

(4) Pull out the drain hose from the nozzle assembly and

remove the nozzle assembly.

Photo 5

5. Removing the horizontal vane motor

(1) Remove the nozzle assembly. (Refer to 5.)

(2) Remove the screws of the horizontal vane motor unit.

(3) Disconnect the connector from the horizontal vane

motor.

(4) Remove the screws of the horizontal vane motor.

(5) Remove the horizontal vane motor from the horizontal

vane motor unit.

Screws of horizontal vane motor unit

OBH548D

OPERATING PROCEDURE PHOTOS

6. Removing the indoor fan motor, the indoor coil

thermistor, and the line flow fan

(1) Remove the panel (Refer to 1.) and the corner box.

(2) Remove the indoor electronic control P.C. board hold-

er, the electrical box and the nozzle assembly.

(3) Remove the screws fixing the motor bed.

(4) Loosen the screw fixing the line flow fan.

(5) Remove the motor bed together with fan motor and

motor band.

(6) Release the hooks of the motor band. Remove the

motor band. Pull out the indoor fan motor.

(8) Remove the indoor coil thermistor from the heat

exchanger.

(

) Install the indoor coil thermistor in its former position

when assembling it. (Refer to Photo 9)

(9) Remove the screws fixing the left side of the heat

exchanger.

(10)

Lift the heat exchanger, and pull out the line flow fan

to the lower-left.

Photo 9

Photo 6

Photo 7

Photo 8

Screw of the line flow fan

Screws of the

motor bed

Screws of the

left side of the

heat exchanger

Motor band

Indoor coil

thermistor(sub)

RT13

Indoor coil

thermistor(main)

RT12

OBH548D

10-2. MSZ-GE24NA MSY-GE24NA

NOTE: Turn OFF the power supply before disassembly.

OPERATING PROCEDURE PHOTOS

1. Removing the panel

(1) Remove the horizontal vanes.

(2) Remove the screw caps of the panel. Remove the

screws of the panel.

(3) Hold the lower part of both ends of the panel and pull

slightly toward you, and then remove the panel by

pushing

it upward.

Photo 1

Photo 2

Photo 3

2. Removing the indoor electronic control P.C.

board, the power monitor receiver SW P.C. board

and the indoor terminal P.C. board

(1) Remove the panel (Refer to 1.) and the corner box.

(2) Remove the screw of the V.A. clamp and the V.A.

clamp.

(3) Remove the screw of the conduit cover and the con-

duit cover.

(4) Remove the screw of the conduit plate, the conduit

plate and the indoor/outdoor connecting wire.

(5) Remove the screw of the electrical cover, and then

the electrical cover.

(6) Remove the ground wire connected to the indoor

electronic control P.C. board from the electrical box.

(Photo 3)

(7) Remove the power monitor receiver holder.

(8) Open the rear cover of the power monitor receiver

holder and pull out the power monitor receiver SW P.C.

board.

(9) Disconnect all the connectors on the indoor electronic

control P.C. board and unhook all lead wires.

(

) Remove the screw of the terminal block on the indoor

terminal P.C. board.

(

) Remove the indoor terminal P.C. board and the

indoor electronic control P.C. board.

3. Removing the indoor electrical box

(1) Remove the panel (Refer to 1.) and the corner box.

(2)

Remove the indoor/outdoor connecting wire.

(Refer to 2 (2)-(4).)

(3) Remove the ground wire connected to the indoor heat

exchanger from the electrical box.

(4) Remove the screw of the electrical cover and remove

the electrical cover.

(5) Disconnect all the connectors on the indoor electronic

control P.C. board and unhook all lead wires.

(6) Remove the screw fixing the electrical box, then the

upper catch of the electrical box, and pull out the

electrical box.

Screws of the panel

Front panelHorizontal vanes

Power monitor

receiver holder

Screw of the

electrical cover

Electrical box

Screw of the

V.A. clamp

Screw of the

electrical box

Indoor electri-

cal control P.C.

board

Ground wires

Indoor terminal

P.C. board

Upper catch

Screw of the

terminal block

Screw of the

conduit cover

Screw of the conduit plate

OBH548D

OPERATING PROCEDURE PHOTOS

4. Removing the nozzle assembly

(1) Remove the panel (Refer to 1.) and the corner box.

(2) Remove the V.A. clamp, and then the indoor/outdoor

connecting wire.

(Refer to 2 (2)-(4).)

(3) Remove the electrical cover. (Photo 2)

(4) Disconnect the following connectors on the electronic

control P.C. board:

CN151 (Horizontal vane motor)

CN152 (Vertical vane motor)

(5) Remove the power monitor receiver holder. (Photo 2)

(6) Pull out the drain hose from the nozzle assembly and

remove the nozzle assembly.

(7) Remove the vane motors. (Refer to 5 and 6.)

Photo 4

Photo 5

Photo 6

5. Removing the vertical vane motor unit

(1) Remove the nozzle assembly. (Refer to 4.)

(2) Remove the crank of the vertical vane motor unit from

the arm of the vertical vane.

(3) Remove the screw of the vertical vane motor unit, and

pull the vertical vane motor unit.

(4) Remove the screws of the vertical vane motor unit

cover.

(5) Remove the crank of the vertical vane motor unit from

the shaft of the vane motor.

(6) Remove the vertical vane motor from the vertical vane

motor unit.

(7) Disconnect the connector of vertical vane motor from

the vertical vane motor.

6. Removing the horizontal vane motor

(1) Remove the nozzle assembly. (Refer to 4.)

(2) Remove the screws of the horizontal vane motor unit,

and pull out the horizontal vane motor unit.

(3) Disconnect the connector from the horizontal vane

motor.

(4) Remove the screws of the horizontal vane motor unit

cover.

(5) Remove the horizontal vane motor from the horizontal

vane motor unit.

Screws of

the vertical

vane motor

unit cover

Screw of the vertical

vane motor unit

Screws of the

horizontal vane

motor unit cover

Screws of the

horizontal vane

motor unit

OBH548D

OPERATING PROCEDURE PHOTOS

7. Removing the water cut, the indoor fan motor,

the indoor coil thermistor, and the line flow fan

(1) Remove the panel (Refer to 1.) and the corner box.

(2) Remove the power monitor receiver holder, the electri-

cal box and the nozzle assembly. (Refer to 3 and 4.)

(3) Remove the screw of the water cut and remove the

water cut.

(4) Remove the screws fixing the motor bed.

(5) Loosen the screw fixing the line flow fan.

(6) Remove the motor bed together with fan motor and

motor band.

(7) Remove the screw of the motor band.

(8) Release the hooks of the motor band. Remove the

motor band. Pull out the indoor fan motor.

(9) Remove the indoor coil thermistor from the heat

exchanger.

Install the indoor coil thermistor in its former position

when assembling it. (Photo 9)

(

) Remove the screws fixing the left side of the heat

exchanger.

(

) Lift the heat exchanger, and pull out the line flow fan

to the lower-left.

Photo 8

Photo 9

Photo 10

Photo 7

Indoor coil thermistor (main) RT12

Screws of the

motor bed

Screws of the

heat exchanger

Motor band

Indoor coil thermistor (sub) RT13

Screw of the line flow fan

Power monitor

receiver holder

Screw of the

electrical cover

Electrical box

Screw of the

V.A. clamp

Screw of the

water cut

Screw of the

motor band

OBH548D

Fixing the indoor coil thermistor

There are 2 forms of parts for fixing the indoor coil thermistor.

NOTE:

Take care to avoid loss and accidental falling of the clip-shape part inside the unit.

Mount the clip-shape part on the marked position.

Do not pull the lead wire when removing the indoor coil thermistor.

Holder shapeClip shape

When fixing the indoor coil thermistor

to the clip-shape/holder-shape part, the

lead wire should point down.

1. Set the indoor coil

thermistor in the center

of the clip-shape part.

2. Check the (marked)

mounting position.

3.Mount the

clip-shape part.

Position and procedure for mounting the clip-shape part

About the

same length

OBH548D

Distributed in Oct. 2014. No. OBH548 REVISED EDITION-D

Distributed in Jul. 2011. No. OBH548 REVISED EDITION-C

Distributed in Apr. 2011. No. OBH548 REVISED EDITION-B

Distributed in Sep. 2010. No. OBH548 REVISED EDITION-A 5

Distributed in Jul. 2009. No. OBH548 5

Made in Japan

New publication, effective Oct. 2014

Specifications subject to change without notice.

HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN