9-6-2. 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 rotate.

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 3 (-) of the fan connector): VDC DC294~325V

TEST POINT : VCC (between 4 (+) and 3 (-) of the fan connector): VCC DC15V

Is the voltage normal?

No

Yes

Sensor signal check

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

Indoor controller board fuse check

Is the fuse normal?

 

No

Replace

 

 

 

 

the fuse.

Yes

 

 

 

 

OK

Replace the indoor

NG

 

Check the operation

controller board.

 

 

 

 

 

 

OK

 

Check the operation

 

END

 

NG

Replace the fan motor.

END

Does the voltage repeat

No

 

DC 0V and DC 15V?

 

Yes

 

Replace the indoor

 

controller board.

 

 

OK

Check the operation

END

NG

 

Replace the fan motor.

 

Replace the fan motor.

YesOK

Check the operation of fan.

END

NG

Replace the indoor controller board.

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Mitsubishi Electronics PKA-A30KA4.TH DC Fan motor fan motor/indoor controller circuit board, Sensor signal check

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