9-3. Instruction of troubleshooting

Start

Indoor unit operates. Outdoor unit doesn't operate.

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

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

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

Outdoor unit

 

Outdoor unit

operates in

 

doesn't

only Test Run

 

operate

operation.

 

even in

 

w1

 

Test Run

 

 

 

operation.

 

 

 

 

w1

 

 

 

 

 

 

 

 

 

 

Check room

 

Refer to

temperature

 

"How to check

thermistor.

 

inverter/

Refer to 9-7.

 

compressor".

"Test point

 

 

diagram and

 

 

voltage".

 

 

 

 

 

Unit doesn't

 

Indoor unit

 

operates, when

operate

 

 

EMERGENCY

normal

 

 

OPERATION

operation in

 

 

switch is pressed.

COOL or

 

 

 

 

HEAT mode.

 

 

 

 

 

 

 

 

 

 

 

 

 

Refer to

 

Refer to 9-6.B

"Check of

 

"Check of

R.V. coil".

 

remote controller

 

 

and receiver

 

 

P.C. board".

 

 

 

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 9-6.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.

w1

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

As for outdoor unit MUZ type, refer to service manual OB379. As for outdoor unit MXZ type, refer to service manual OB377.

All lamps

 

Left lamp

Left lamp

 

Flash on and off

2-time flash

Flash on and off

 

 

at 0.5-second

Cause:

at 0.5-second

 

intervals

 

intervals

Indoor unit

Cause:

 

Cause:

• Trouble of

Indoor unit

 

Indoor/

room temp-

• The horizontal

 

Outdoor unit

erature/

vane is not

 

Mis-wiring

indoor coil

installed

 

or trouble

thermistor

correctly.

 

of serial signal

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Refer to 9-6.

 

Refer to 9-6.

Check room

E "Check of

 

D "How to

temperature

installation of

 

check of

thermistor

the horizontal

 

mis-wiring

and indoor

vane".

 

and serial

coil thermis-

 

 

 

signal error

tor.

 

 

 

(when

Refer to 9-7.

 

 

 

outdoor unit

"Test point

 

 

 

doesn't work)".

diagram and

 

 

 

 

 

voltage".

 

 

 

 

 

 

 

Left lamp

 

Left lamp

 

Left lamp

 

Left lamp

 

Left lamp

 

Left lamp

3-time flash

 

4-time flash

 

5-time flash

 

6-time flash

 

7-time flash

 

14-time flash

Cause:

 

Cause:

 

Cause:

 

Cause:

 

Cause:

 

Cause:

Indoor unit

 

Indoor unit

 

Outdoor unit

 

Outdoor unit

 

Outdoor unit

 

Outdoor unit

• Trouble of

 

• Trouble of

 

• Outdoor

 

• Trouble of

 

• Trouble of

 

• Other

indoor fan

 

indoor unit

 

power

 

thermistor

 

outdoor

 

abnormality

motor

 

control

 

system

 

in outdoor

 

control

 

 

 

 

 

 

system

 

abnormality

 

unit

 

system

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Refer to 9-6.

 

Replace the

 

Refer to

 

Refer to

 

Replace the

 

Check

A "Check of

 

indoor

 

"How to check

 

"Check of

 

inverter P.C.

 

"Flow chart of

indoor fan

 

electronic

 

inverter/

 

outdoor

 

board or

 

the detailed

motor".

 

control

 

compressor".

 

thermistors".

 

the outdoor

 

outdoor unit

 

 

P.C. board.

 

 

 

 

 

electronic

 

failure mode

 

 

 

 

 

 

 

 

control P.C.

 

recall function."

 

 

 

 

 

 

 

 

board.

 

 

 

 

 

 

 

 

 

 

 

 

 

14

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Mitsubishi Electronics MSZ-GA35VA Instruction of troubleshooting, Start Indoor unit operates. Outdoor unit doesnt operate

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