Mitsubishi Electric PMFY Series Technical & Service Manual page 25

8-2. TROUBLESHOOTING

Check method of indoor fan motor (fan motor / controller board)

Notes

· High voltage is applied to the connecter (FAN)(CNMF1, 2) for the fan motor. Pay attention to the service.

· Do not pull out the connector (FAN)(CNMF1, 2) for the motor with the power supply on, doing so may result in damage

to the board.

(FAN)

PMFY-P20/25/32/40VBM-E

(CNMF1, 2)

PMFY-P20/25/32/40VBM-E#2

Self check

Symptom : The indoor fan can not rotate.

Indoor controller board fuse check

Is the fuse normal?

Yes

Wiring contact check

Contact of fan motor connector (FAN) (CNMF1,2)

Is there contact failure?

No

Turn ON the power supply.

Power supply check

Check the voltage of the indoor

Approx. 310~340V DC between the connecter < (FAN)

Is the voltage normal?

No

Replace the indoor controller board.

Check the operation

NG

Replace the fan motor.

OC307E

PMFY-P20/25/32/40VBM-E

PMFY-P20/25/32/40VBM-ER3

Is the resistance

between the terminals of

drain pump normal?

No

Replace the drain pump.

Yes

Wiring recovery

controller board with the connector (FAN)

Yes

Check the operation

Replace the the indoor controler board.

OK

END

25

1

PMFY-P20/25/32/40VBM-ER4

(CNMF1, 2)

(+) and

(–) > < (CNMF1) (+) and (CNMF2) (-) >

Replace

the fan motor.

OK

NG

Replace the fan motor.

Replace the indoor controller board.

connected to the board.

END