Mitsubishi Electronics MSY-A15NA, MSZ-A15NA, MSZ-A09NA, MSY-A17NA, MSZ-A17NA User Manual

...

SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

Revision B:

• MSZ-A•NA- and MSY-A•NA- have been added.

Please void OB450 REVISED EDITION-A.

INDOOR UNIT

No. OB450

SERVICE MANUAL

REVISED EDITION-B

Wireless type Models

MSZ-A09NA MSZ-A24NA MSZ-A09NA - MSZ-A24NA -

MSZ-A12NA MSY-A15NA MSZ-A12NA - MSY-A15NA MSZ-A15NA MSY-A17NA MSZ-A15NA - MSY-A17NA MSZ-A17NA MSY-A24NA MSZ-A17NA - MSY-A24NA -

Outdoor unit service manual

MUZ-A·NA Series (OB451) MXZ-A·NA Series (OB444)

CONTENTS

1. TECHNICAL CHANGES ····································2

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

3. SPECIFICATION·················································4

4. OUTLINES AND DIMENSIONS·························6

5. WIRING DIAGRAM ············································8

6. REFRIGERANT SYSTEM DIAGRAM················9

MSZ-A09NA MSY-A15NA MSZ-A12NA MSY-A17NA MSZ-A15NA MSZ-A17NA

7. SERVICE FUNCTIONS ····································10

8. TROUBLESHOOTING ······································11

9. DISASSEMBLY INSTRUCTIONS ····················25

10. PARTS LIST······················································30 10-1. PARTS LIST ·············································30 10-2. RoHS PARTS LIST··································36

11. MICROPROCESSOR CONTROL·····················42

NOTE:

RoHS compliant products have <G> mark on the spec name plate. For servicing of RoHS compliant products, refer to the PARTS LIST (RoHS compliant).

Remote controller

KM06A

KM07J KM06B KM07K KM06C KM07L KM06D

KM07M

Temperature indication

_F/ _C

MSZ-A09/12/15/17NA MSZ-A09/12/15/17NAMSZ-A24NA MSZ-A24NAMSY-A15/17NA MSY-A15/17NAMSY-A24NA MSY-A24NA-

Models

Revision A :

• PARTS LIST has been revised. (10-1.8, 10-2.8)

Revision B :

• MSZ-A•NA- and MSY-A•NA- Remote controller has been changed.

TECHNICAL CHANGES

MSZ09UN ➔ MSZ-A09NA MSZ12UN ➔ MSZ-A12NA MSH15TN ➔ MSZ-A15NA MSH17TN ➔ MSZ-A17NA

1.Control method between indoor and outdoor has been changed.

2.Indoor fan motor has been changed.

3.Signal of remote controller has been changed. (It is not available for conventional models.)

MSZ-A09NA➔MSZ-A09NA- MSZ-A12NA➔MSZ-A12NA- MSZ-A15NA➔MSZ-A15NA- MSZ-A17NA➔MSZ-A17NA-

MSH24WN ➔ MSZ-A24NA MS15TN ➔ MSY-A15NA MS17TN ➔ MSY-A17NA MS24WN ➔ MSY-A24NA

MSZ-A24NA➔MSZ-A24NA

MSY-A15NA➔MSY-A15NA-

MSY-A17NA➔MSY-A17NA-

MSY-A24NA➔MSY-A24NA-

1.Remote controller has been changed.

• Temperature indication function (_F/_C) has been added. (Refer to 11-10.)

• Timer indication has been changed. (AM/PM indication)

2.Conduit plate has been removed. (MSZ-A09/12/15/17,MSY-A15/17)

3.Conduit cover, terminal block cover and terminal block holder have been changed. (MSZ-A09/12/15/17,MSY-A15/17)

Line flow fan

Air outlet Vertical vane

Air inlet

Display section

Front panel

Panel

Heat exchanger

Horizontal vane

Operation section

(When the front panel is opened)

Remote controller

Remote control receiving section

Catechin air filter

Air cleaning filter (Anti-Allergy Enzyme Filter, Blue bellows type)

Emergency operation switch

Operation indicator lamp

Remote control

receiving section

Operation Indicator lamp

1 2 3 4 5 6 7 8

Installation plate Installation plate fixing screw 4 o 25 mm Remote controller holder Fixing screw for 3 o 3.5 o 1.6 mm (Black) Battery (AAA) for remote controller Wireless remote controller Felt tape (Used for left or left-rear piping) Conduit plate

1 7 1 2 2 1 1

–

1 8 1 2 2 1 1 1

MSZ-A24NA MSY-A24NA

MSZ-A09/12/15/17NA

MSY-A15/17NA

1 5 1 2 2 1 1

–

MSZ-A09/12/15/17NA- 1

MSY-A15/17NA- 1

PART NAMES AND FUNCTIONS

MSZ-A09NA MSY-A15NA MSZ-A12NA MSY-A17NA MSZ-A15NA MSZ-A17NA

MSZ-A09NA MSZ-A12NA MSZ-A15NA MSZ-A17NA MSY-A15NA MSY-A17NA

MSZ-A24NA MSY-A24NA

ACCESSORIES

Item

Model

MSZ-A12NA

Indoor unit model External finish Power supply Max. fuse size (time delay)/ Disconnect switch Min. circuit ampacity Fan motor

Airflow Low—Med.—High Moisture removal

Sound level Low-Med.-High Cond. drain connection O.D.

Dimensions Weight

Remote controller Control voltage (by built-in transformer)

V, phase, Hz

A A

F.L.A

CFM CFM

pt./h

dB(A)

in. in. in. in. Ib.

MSZ-A12NA

1.0

0.76

353-240-159

353(318)-240(215)-152(134)

3.2

22-34-42

MSZ-A09NA

1.0

0.76

307-222-159

307(275)-229(205)-152(134)

2.3

22-33-38

White

208/230, 1, 60

5/8

30-11/16

8-1/4

11-3/4

Wireless type

12-24V DC

MSZ-A09NA

HEAT Dry COOL Dry (Wet)

W D H

Item

Model

MSZ-A17NA MSY-A17NA

Indoor unit model External finish Power supply Max. fuse size (time delay)/ Disconnect switch Min. circuit ampacity Fan motor

Airflow Low—Med.—High Moisture removal

Sound level Low-Med.-High Cond. drain connection O.D.

Dimensions Weight

Remote controller Control voltage (by built-in transformer)

V, phase, Hz

A A

F.L.A

CFM CFM

pt./h

dB(A)

in. in. in. in. Ib.

1.0

0.76

381(342)-328(293)-268(240)

5.1

1.0

0.76

381(342)-328(293)-268(240)

4.7

381-314-254

34-40-45/34-38-44—34-40-45/ —

381-314-254

34-40-46/34-38-44—34-40-46/ —

White

208/230, 1, 60

5/8

30-11/16

8-1/4

11-3/4

Wireless type

12-24V DC

MSZ-A15NA MSY-A15NA

HEAT Dry COOL Dry (Wet)

W D H

HEAT Dry COOL Dry (Wet)

W D H

Item

Model

MSY-A24NA

Indoor unit model External finish Power supply Max. fuse size (time delay)/ Disconnect switch Min. circuit ampacity Fan motor

Airflow Low—Med.—High Moisture removal

Sound level Low-Med.-High Cond. drain connection O.D.

Dimensions Weight

Remote controller Control voltage (by built-in transformer)

V, phase, Hz

A A

F.L.A

CFM CFM

pt./h

dB(A)

in. in. in. in. Ib.

MSY-A24NA

1.0

0.76

—

568(508)-431(385)-296(265)

7.3

34-40-49/ —

MSZ-A24NA

1.0

0.76

568-486-296

568(508)-431(385)-296(265)

7.3

34-40-49/34-40-48

White

208/230, 1, 60

5/8

43-5/16

10-1/4

12-13/16

Wireless type

12-24V DC

MSZ-A24NA

(Cooling/Heating)

MSZ-A15NA MSY-A15NA MSZ-A17NA MSY-A17NA

SPECIFICATION

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

❈1 : Rating conditions (cooling) — Indoor : 80˚FDB, 67˚FWB, Outdoor : 95˚FDB, (75˚FWB) ❈2 : (heating) — Indoor : 70˚FDB, 60˚FWB, Outdoor : 17˚FDB, 15˚FWB

(heating) — Indoor : 70˚FDB, 60˚FWB, Outdoor : 47˚FDB, 43˚FWB

3-1. OPERATING RANGE

MSZ-A09NA MSY-A15NA MSZ-A12NA MSY-A17NA MSZ-A15NA MSY-A24NA MSZ-A17NA MSZ-A24NA

Rated voltage Guaranteed VoltageModel

Min. 198V Max. 253V

208V

230V

208/230V 1phase 60Hz

78%

—

Function

Cooling

Heating

Standard temperature

Maximum temperature

Minimum temperature

Maximum humidity

Standard temperature

Maximum temperature

Minimum temperature

DB (˚F)

80 95 67

70 80 70

WB (˚F)

67 71 57

60 67 60

Indoor

DB (˚F)

115

47 75 14

WB (˚F)

— — —

43 65 13

Outdoor

Condition

Intake air temperature

(1) POWER SUPPLY

(2) OPERATION

3-2. OUTLET AIR SPEED AND COVERAGE RANGE

Model

MSZ-A09NA

MSZ-A12NA

MSZ-A15NA MSZ-A15NA MSY-A15NA MSZ-A17NA MSZ-A17NA MSY-A17NA MSZ-A24NA MSZ-A24NA MSY-A24NA

Mode

HEAT COOL

HEAT COOL HEAT COOL HEAT COOL HEAT COOL

Function

Dry Dry

Wet

Dry Dry

Wet

Dry Dry

Wet

Dry Dry

Wet

Dry Dry

Wet

Air flow

(CFM)

Air speed

(ft./sec.)

307 307 275 353 353 318 381 381 342 381 381 342 568 568 508

16.8

15.1

19.3

17.4

20.9

18.8

20.9

18.8

20.2

18.1

Coverage range (ft.)

23.4

21.0

26.7

24.1

28.8

26.0

28.8

26.0

34.4

30.9

● The air coverage range is the figure up to the position where the air speed is 1 ft./sec., when air is blown out horizontally from the unit properly at the High speed position. The coverage range should be used only as a general guideline since it varies according to the size of the room and furniture arranged inside the room.

11-3/4

424-9/16

30-11/16

8-1/4

3/16

2-1/8

3/4

6-1/4

2-5/16

Air in

Air out

Installation plate

Insulation [1-1/8

Drain hose [5/8 (Connected part O.D)

Liquid line [1/4 19-11/16 Gas line [3/8 16-15/16 Insulation [1-3/8 O.D [3/4 I.D

{

6-1/8 6-1/8

7/8

1-3/4

13-3/16 12-5/8

1-5/8 8-7/16

10-1/8

1-11/16

8-7/16

1/8

11-5/16

2-3/4

2-3/16

2-3/16 2-3/16

8-7/8 8-7/8

9/1610-3/4

9-3/16

Wall hole [2-9/16

Indoor unit

Installation plate

7/16x13/16

Oblong hole

7/16x1 Oblong hole

7/8

hole

Conduit plate(MSZ-A•NA- and MSY-A•NA- are excluded.)

OUTLINES AND DIMENSIONS

MSZ-A09NA MSY-A15NA MSZ-A12NA MSY-A17NA MSZ-A15NA MSZ-A17NA

Unit : inch

MSZ-A24NA MSY-A24NA

Unit : inch

12-13/16

2-3/16

2-5/16

42-1/16

43-5/16

31-1/8

3/4

9-15/16

Installation plate

3-7/8

1-7/8

3-7/8 6-13/16

Air in

16-5/16 16-5/16

Wall hole [3

10-1/4

Air out

3/16

Installation plate

Indoor unit

Liquid line [1/4 19-11/16 Gas line [5/8 16-15/16

{

Insulation [1-15/16 O.D

Drain hose [5/8 (Connected part O.D)

Insulation [1-1/8

6-13/16

[1-1/4 I.D

1/8

10-1/161-7/8

5/16

12-3/8

6-1/4

Wireless remote controller

MSZ-A09NA MSY-A15NA MSZ-A12NA MSY-A17NA MSZ-A15NA MSZ-A17NA

WIRING DIAGRAM

MSZ-A24NA MSY-A24NA

Indoor heat exchanger

Flared connection

Room temperature thermistor RT11

Indoor coil thermistor RT13(sub)

Flared connection

Refrigerant pipe [3/8 (with heat insulator)

Refrigerant pipe [1/4 (with heat insulator)

Indoor coil thermistor RT12(main)

REFRIGERANT SYSTEM DIAGRAM

MSZ-A09NA MSZ-A12NA

MSZ-A15NA MSY-A15NA MSZ-A17NA MSY-A17NA

Refrigerant pipe [1/2 (with heat insulator)

Indoor heat exchanger

Room temperature thermistor RT11

Indoor coil thermistor RT12(main)

Distributor

Flared connection

Indoor coil thermistor RT13(sub)

Flared connection

Unit:inch

MSZ-A24NA MSY-A24NA

Indoor heat exchanger

Room temperature thermistor RT11

Indoor coil thermistor RT12(main)

Distributor

Indoor coil thermistor RT13(sub)

Refrigerant pipe[1/4 (with heat insulator)

Refrigerant pipe [5/8 (with heat insulator)

Flared connection

Refrigerant pipe [1/4 (with heat insulator)

Refrigerant flow in cooling Refrigerant flow in heating

No. 1 unit No. 2 unit No. 3 unit No. 4 unit

1 unit operation No modification

– – –

2 units operation

Same as at left

Solder J1

– –

3 units operation

Same as at left Same as at left

Solder J2

–

4 units operation

Same as at left Same as at left Same as at left

Solder both J1 and J2

SERVICE FUNCTIONS

MSZ-A09NA MSZ-A12NA MSZ-A15NA MSZ-A17NA MSZ-A24NA MSY-A15NA MSY-A17NA MSY-A24NA

7-1. TIMER SHORT MODE

For service, set time can be shortened by short circuit of JPG and JPS the indoor electronic control P.C. board. The time will be shortened as follows. (Refer to 8-7.) Set time : 1-minute ➔ 1-second Set time : 3-minute ➔ 3-second (It takes 3 minutes for the compressor to start operation. However, the starting time is

shortened by short circuit of JPG and JPS.)

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 :

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.

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.

Table 1

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 restored.

JR07

CN151 CN211CN112

7-3. AUTO RESTART FUNCTION

JR07

CN151

CN152

CN101

CN211CN112

Housing point

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. The “AUTO RESTART FUNCTION” sets to work the moment power has restored after power failure. Then, the unit will restart automatically.

Operation

1 If the main power has been cut, the operation settings remain. 2 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 release “AUTO RESTART FUNCTION”

1Turn off the main power of the unit. 2Solder the Jumper wire JR07 on the indoor electronic control P.C. board. (Refer to 8-7.)

MSZ-A09/12/15/17NA MSY-A15/17NA

MSZ-A24NA MSY-A24NA

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.

TROUBLESHOOTING

MSZ-A09NA MSZ-A12NA MSZ-A15NA MSZ-A17NA MSZ-A24NA MSY-A15NA MSY-A17NA MSY-A24NA

8-1. Cautions on troubleshooting

1. Before troubleshooting, check the following

1) Check the power supply voltage.

2) Check the indoor/outdoor connecting wire for mis-wiring.

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 confirming 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 electronic control P.C. board.

3) When removing the electronic control 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 housing of the connector. DO NOT pull the lead wires.

Lead wiring

3. Troubleshooting procedure

RESET button

Insert the negative pole of the batteries first. Check if the polarity of the batteries is correct.

OPERATION INDICATOR

Not lighted

Blinking

Lighted

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 abnormality indication is flashing on and off before starting service work.

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

3) If the electronic control P.C. board is supposed to be defective, check the copper foil pattern for disconnection and the

components for bursting and discoloration.

4) When troubleshooting, refer to 8-2., 8-3. and 8-4.

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.

1 Remove the front lid and insert batteries.

Then reattach the front lid.

2 Press RESET button with tip end of ball point pen

or the like, and then use the remote controller.

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.

INFORMATION FOR MULTI SYSTEM AIR CONDITIONER OUTDOOR UNIT : MXZ series

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

•Unit won’t operate in case the total capacity of indoor units exceeds the capacity of outdoor units. Do not connect indoor units beyond the outdoor unit capacity. Operation indicator lamp flashes as shown in the figure below.

•When you try to operate two or more indoor units with one outdoor unit simultaneously, one for the cooling and the other for heating, the operation mode of the indoor unit that operates earlier is selected. The other indoor units cannot operate, indicating 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 flowing may be heard, they are not malfunction. The reason is that the refrigerant continuously flows into it.

8-2. Failure mode recall function

Operational procedure

Yes

(Blinks)

(OFF)

Yes

Releasing the failure mode recall function

Note1.Make sure to release the failure mode recall function once it's 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.

W2. Blinking pattern when the indoor unit is abnormal:

W3.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 0.5second interval

2.5-second OFF 3-second ON

Blinking at 0.5second interval

Beeps

Repeated cycle

2.5-second OFF

Blinking at 0.5second interval

No beep Beeps

Repeated cycle

2.5-second OFF 3-second ON

Blinking at 0.5-

second interval

Repeated cycle

Beeps

Does the left 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 the left lamp of OPERATION INDICATOR lamp. W2

The cause of abnormality cannot be found because the abnormality doesn't recur.

Setting up the failure mode recall function

Before blinking, does the left lamp of OPERATION INDICATOR lamp stay ON for 3 seconds? Stays ON for 3 seconds (without beep): The outdoor unit is abnormal.

The indoor unit is abnormal. Check the blinking pattern, and confirm the abnormal point with the indoor unit failure mode table(8-2.2.). Make sure to check at least two consecutive blinking cycles. W2

Turn ON the power supply. <

Preparation of the remote controller

1 While pressing both OPERATION SELECT

button and TOO COOL button on the remote controller at the same time, press RESET button.

2 First, release RESET button.

And release the other two buttons after all LCD in operation display section of the remote controller is displayed after 3 seconds.

Deleting the memorized abnormal condition

1After repairing the unit, recall the failure mode again according to

"Setting up the failure mode recall function" mentioned above.

2Press OPERATE/STOP(ON/OFF) button of the remote controller (the set temperature is displayed)

with the remote controller headed towards the indoor unit.

3Press EMERGENCY OPERATION switch so that the memorized abnormal condition is deleted. 4Release the failure mode recall function according to "Releasing the failure mode recall function"

mentioned above.

Repair the defective parts.

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.

Judgment of indoor/outdoor abnormality

Press OPERATE/STOP(ON/OFF) button of the remote controller (the set temperature is displayed) with the remote controller headed towards the indoor unit. W1

Indoor unit is normal. But the outdoor unit might be abnormal because there are some abnormalities that can't be recalled with this way. Confirm if outdoor unit is abnormal according to the detailed outdoor unit failure mode recall function.

The outdoor unit is abnormal. Check the blinking pattern, and confirm the abnormal point with the outdoor unit failure mode table (Refer to outdoor unit service manual.) Make sure to check at least two consecutive blinking cycles. W3

W1. Regardless of normal or abnormal condition, a short beep is emitted once the signal is received.

Those figures show about MSZ-A09/12/15/17.

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 (8-4.) disappears, the memorized failure details can be recalled. This mode is very useful when the unit needs to be repaired for the abnormality which doesn't recur.

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

2. Indoor unit failure mode table

12-time flash

2.5-second OFF

Replace the indoor electronic control P.C. board.

Indoor control system

It cannot properly read data in the nonvolatile memory of the indoor electronic control P.C. board.

11-time flash

2.5-second OFF

Refer to 8-6.A "Check of indoor fan motor".

Indoor fan motor

The rotational frequency feedback signal is not emit during the 12 seconds the indoor fan operation.

2-time flash

2.5-second OFF

Refer to the characteristics of the main indoor coil thermistor, the sub indoor coil thermistor (8-7.).

Indoor coil thermistor

The indoor coil thermistor short or open circuit is detected every 8 seconds during operation.

3-time flash

2.5-second OFF

Refer to 8-6.D "How to check mis-wiring and serial signal error".

Serial signal

The serial signal from outdoor unit is not received for a maximum of 6 minutes.

1-time flash every 0.5-second

Refer to the characteristics of the room temperature thermistor (8-7.).

Room temperature thermistor

The room temperature thermistor short or open circuit is detected every 8 seconds during operation.

Not lighted –Normal –

Left lamp of OPERATION

INDICATOR lamp

Correspondence

Abnormal point (Failure mode)

Condition

NOTE : Blinking patterns of this mode differ from the ones of Troubleshooting check table (8-4.).

8-3. Instruction of troubleshooting

Start

Indoor unit operates. Outdoor unit doesn't operate.

Outdoor unit operates only in Test Run operation.

Check room temperature thermistor. Refer to 8-7. "Test point diagram and voltage".

Outdoor unit doesn't operate even in Test Run operation.

Refer to "How to check inverter/ compressor".

Indoor unit operates. Outdoor unit doesn't operate normally.

Unit doesn't operate normal operation in COOL or HEAT mode.

Refer to "Check of R.V. coil".

Indoor unit doesn't receive the signal from remote controller.

Indoor unit operates, when EMERGENCY OPERATION switch is pressed.

Refer to 8-6.B "Check of remote controller and receiver P.C. board".

OPERATION INDICATOR lamp on the indoor unit is flashing on and off.

Indoor unit doesn't operate, when EMERGENCY OPERATION switch is pressed.

1. Check indoor / outdoor connecting wire. (Check if the power is supplied to the indoor unit.)

2. Refer to 8-6.C "Check of indoor electronic control P.C. board and indoor fan motor".

If blinking of OPERATION INDICATOR lamp cannot be checked, it can be checked with failure mode recall function.

"Test Run operation" means the operation within 30 minutes after EMERGENCY OPERATION switch is pressed.

Refer to outdoor unit service manual.

Left lamp Flash on and off at 0.5-second intervals Cause: Indoor/ Outdoor unit

• Mis-wiring or trouble of serial signal

Refer to 8-6. D "How to check of mis-wiring and serial signal error

Left

lamp 2-time flash Cause: Indoor unit

• Trouble of room temp erature/ indoor coil thermistor

Check room temperature thermistor and indoor coil thermistor. Refer to 8-7. "Test point diagram and voltage".

Left

lamp 3-time flash Cause: Indoor unit

• Trouble of indoor fan motor

Refer to 8-6. A "Check of indoor fan motor".

Left lamp 4-time flash Cause: Indoor unit

• Trouble of indoor unit control system

Replace the indoor electronic control P.C. board.

Left lamp 5-time flash Cause: Outdoor unit

• Outdoor power system abnormality

Refer to "How to check inverter/ compressor".

Left lamp 6-time flash Cause: Outdoor unit

• Trouble of thermistor in outdoor unit

Refer to "Check of outdoor thermistors".

Left lamp 7-time flash Cause: Outdoor unit

• Trouble of outdoor control system

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

Left lamp 14-time flash Cause: Outdoor unit

• Other abnormality

Check "Flow chart of the detailed outdoor unit failure mode recall function."

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