Mitsubishi MSZ-GA60VA Service Manual download pdf (Page 30)

30

Start

Indoor unit

operates.

Outdoor unit

doesn't

operate.

Indoor unit

doesn't receive

the signal from

remote controller.

OPERATION INDICATOR

lamp on the indoor unit is

flashing on and off.

Outdoor unit

operates in

only Test Run

operation. w

Outdoor unit

doesn't

operate

even in

Test Run

operation. w

Indoor unit

operates, when

EMERGENCY

OPERATION

switch is pressed.

Indoor unit

doesn't operate,

when

EMERGENCY

OPERATION

switch is pressed.

Check room

temperature

thermistor.

Refer to

"Test point

diagram and

voltage".

Refer to 10-6.E

"How to check

inverter/

compressor".

Refer to

"Check of

remote controller

and receiver

P.C. board".

1. Check indoor / outdoor

connecting wire.

(Check if the power

is supplied to the

indoor unit.)

2. Refer to

"Check of indoor

electronic control

P.C. board and indoor

fan motor".

Unit doesn't

operate

normal

operation in

COOL or

HEAT mode.

Refer to 10-6.C

"Check of

R.V. coil".

Left lamp

Flash on and

off at

0.5-second

intervals

Cause:

Indoor/

Outdoor unit

• Mis-wiring or

trouble of

serial signal.

Left lamp

2-time flash

Cause:

Indoor unit

• Trouble of

room temp-

erature/

indoor coil

thermistor

Left lamp

3-time flash

Cause:

Indoor unit

• Trouble of

indoor fan

motor

Left lamp

5-time flash

Cause:

Outdoor unit

• Outdoor

power

system

abnormality

Left lamp

6-time flash

Cause:

Outdoor unit

• Trouble of

thermistor

in outdoor

unit

Left lamp

7-time flash

Cause:

Outdoor unit

• Trouble of

outdoor

control

system

Refer to 10-6.B

"How to check

mis-wiring

and serial

signal error

(when

outdoor unit

doesn't work)".

Check room

temperature

thermistor

and indoor

coil thermis-

tor.

Refer to

"Test point

diagram and

voltage".

Refer to

"Check of

indoor fan

motor".

Refer to 10-6.E

"How to check

inverter/

compressor".

Refer to 10-6.F

"Check of

outdoor

thermistors".

Replace

inverter P.C.

board.

Left lamp

14-time flash

Cause:

Outdoor unit

• Other

abnormality

Check 10-2.2.

"Flow chart of

the detailed

outdoor unit

failure mode

recall function."

Left lamp

4-time flash

Cause:

Indoor unit

• Trouble of

indoor unit

control

system

Replace the

indoor

electronic

control

P.C. board.

As for indoor unit,

refer to service manual OB388.

Indoor unit operates.

Outdoor unit doesn't

operate normally.

If blinking of OPERATION

INDICATOR lamp cannot be

checked, it can be checked with

failure mode recall function.

w As for "Test run operation",

refer to indoor unit service

manual OB388.

10-3. Instruction of troubleshooting

OB389 --1qxp 05.1.26 18:14 Page 30

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