Mitsubishi MSC-GA20VB Service Manual download pdf (Page 23)

23

Start

Indoor unit

operates.

Outdoor unit

does not

operate.

Indoor unit

does not receive

the signal from

remote controller.

Indoor unit

operates.

Outdoor unit

does not operate

normally.

OPERATION INDICATOR

lamp on the indoor unit is

flashing ON and OFF.

Outdoor unit

operates only

in “Test run

operation”.

Indoor unit

operates, when

the EMERGENCY

OPERATION

switch is pressed.

Indoor unit

does not operate,

when the

EMERGENCY

OPERATION

switch is pressed.

Check room

temperature

thermistor.

Refer to 10-6.

"Test point

diagram and

voltage".

Refer to

"Check of

outdoor unit".

Refer to 10-5.

"Check of

remote controller

and receiver

P.C. board".

MUH/MXZ

Flash ON and

OFF at 0.5-

second intervals

Cause: Indoor/

outdoor unit

• Mis-wiring/or

trouble of

serial signal

2-time flash

Cause:

Indoor unit

• Trouble of

room temp-

erature/

indoor coil

thermistor

3-time flash

Cause:

Indoor unit

• Trouble of

indoor fan

motor

Refer to

10-5. or

"How to

check

mis-wiring/

and serial

signal error

(When

outdoor unit

does not

work)".

Check room

temperature

thermistor

and indoor

coil thermis-

tor.

Refer to 10-6.

"Test point

diagram and

voltage".

Refer to

10-5.

"Check of

indoor fan

motor".

4-time flash

Cause:

Indoor unit

• Trouble of

indoor unit

control

system

Replace the

indoor

electronic

control

P.C. board.

Refer to outdoor unit service manual.

1. Check indoor/

outdoor

connecting wire.

2. Refer to 10-5.

"Check of indoor

electronic control

P.C. board".

Outdoor unit

does not

stop even

if indoor unit

stops.

MUH/MXZ

Unit does not

operate

normal

operation in

COOL or

HEAT mode.

MU

Check of wiring

diagram of

outdoor unit

MUH

Refer to

"Check of

outdoor unit".

Refer to

"Check of

R.V. coil".

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

MUH/MUX

Outdoor unit

does not

operate

even in

“Test run

operation”.

Indoor unit

operates.

But indoor

unit does not

blow out

cool air.

MUX-2A28/2A59/3A60/

3A63/2A70/4A73VB

Refer to

"Check of

indoor/outdoor

units' connection

and outdoor

unit".

MUH/MXZ

6-time flash

Cause:

Outdoor unit

• Trouble of

thermistor

in outdoor

unit

MUH/MXZ

7-time flash

Cause:

Outdoor unit

• Trouble of

outdoor

control

system

Refer to

"Check of

outdoor

thermistor"

and others.

Replace the

deicer

P.C. board

and others.

10-time flash

Cause:

Outdoor unit

MXZ

• Outdoor

refrigerant

system

abnormality

Refer to

outdoor

refrigerant

system

related items.

MXZ

5-time flash

Cause:

Outdoor unit

• Outdoor

power

system

abnormality

Refer to

"Check of

inverter/

compressor"

and "Check

of power

supply".

1.<The case of the trouble of the serial signal>

When the power is turned off and turned on again, the indication shows “the trouble of mis-wiring”.

10-2. INSTRUCTION OF TROUBLESHOOTING

OBH529A

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