7-1-3. DC Fan motor (fan motor/indoor controller circuit board)

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

Notes

·High voltage is applied to the connecter (CNMF) for the fan motor. Pay attention to the service.

·Do not pull out the connector (CNMF) for the motor with the power supply on.

(It causes trouble of the indoor controller circuit board and fan motor.) Self check

Symptom : The indoor fan cannot turn around.

Wiring contact check

Contact of fan motor connector (CNMF)

Is there contact failure?

Yes

Wiring recovery

No

Power supply check (Remove the connector (CNMF))

Measure the voltage in the indoor controller circuit board.

TEST POINT : VDC (between 1 (+) and 4 (-) of the fan connector): VDC DC294~325V

TEST POINT : VCC (between 5 (+) and 4 (-) of the fan connector): VCC DC15V

Is the voltage normal?

No

Yes

Indoor controller board fuse check

No

Is the fuse normal?

Replace the fuse

OK

Sensor signal check

Measure the voltage between CNMF  and DC 0V and DC 15V in the indoor controller circuit board.

Does the voltage repeat

 

No

 

 

DC 0V and DC 15V?

 

 

Yes

 

 

Replace indoor

 

 

controller board

 

 

 

OK

 

 

 

Check the operation

 

END

NG

 

 

Yes

Replace indoor controller board.

OK

Check the operation

NG

Replace the fan motor

Replace the fan motor

OK

Check the operation

NG

Check the operation

NG

END

END

END

Replace the fan motor.

Replace indoor controller board.

23

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Mitsubishi Electronics PCFY-P36NKMU-E, PCFY-P15NKMU-E, PCFY-P30NKMU-E, PCFY-P24NKMU-E service manual Sensor signal check

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