The unit does not operate with the remote controller.

Also, OPERATION INDICATOR lamp does not light up by pressing EMERGENCY OPERATION switch.

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

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.

Does the unit operate with the remote controller? Does OPERATION INDICATOR lamp light up by pressing EMERGENCY OPERATION switch?

No

Turn OFF the power supply.

Check both “parts side” and “pattern side” of the indoor electronic control P.C. board visually.

Measure the resistance between CN211 3 and 4 of the indoor fan motor connector. Normal value is approx. 30k' to 50k'.

Yes

Measure the resistance of the horizontal vane motor coil.

Normal value is approx. 300' to 250'.

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

Yes

Are the varistor(NR11) burnt No and the fuse(F11) blown?

Be sure to check both the fuse and the varistor in any case.

No

Is the fuse(F11) blown only?

Short circuit:

Replace the indoor fan motor.

Short circuit:

Replace the horizontal vane motor and the indoor electronic control P.C. board.

w1,2

Yes

 

Measure the resistance between 1(+) and 3(-) of the indoor fan motor connector (to CN211 on the indoor electronic control P.C. board) .

 

 

 

 

 

 

 

w3. Short circuit:

 

w3

 

 

No

 

Is the resistance 1M'

The indoor fan motor is

 

 

or more?

 

 

abnormal.

 

 

 

 

 

 

 

 

 

 

 

Yes

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

w1. The fan motor connector's1 lead wire is red, whereas 3 is black.

w2. Connect "+" of the tester to fan motor connector's1 lead wire, and "-" to 3 lead wire, otherwise the resistance cannot be measured properly.

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

Replace the fuse (F11).

Measure the cement resistance R111 on the indoor electronic control P.C. board.

Is the resistance approx. 4'?

No

Replace the indoor electronic control P.C. board and the indoor fan motor.

Yes

Replace the indoor electronic control P.C. board.

Indoor electronic control P.C.Board

Varistor(NR11)

Fuse(F11)

CN211

19

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Mitsubishi Electronics MSZ-GA22VA, MSZ-GA25VA, MSZ-GA35VA service manual Indoor electronic control P.C.Board

MSZ-GA25VA, MSZ-GA35VA, MSZ-GA22VA specifications

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