Check of outdoor fan motor | Mitsubishi Electronics MUY-D36NA, U1

Fan motor does not operate or stops operating shortly after starting the operation.

D Check of outdoor fan motor

Check the connection between the connector CN931 and CN932.

Is the resistance between each ter-

minal of outdoor fan motor normal? Yes (Refer to 10-4.)

(Fixed to either 5 or 0 VDC) No

Replace the outdoor DC fan motor.

Disconnect CN932 from outdoor electronic control P.C. board, and turn on the power supply.

Rotate the outdoor fan motor manually and measure the voltage of CN931.

Between 1(+) and 5(-)

Between 2(+) and 5(-)

Between 3(+) and 5(-)

Does the voltage between each terminal become 5 VDC and 0 VDC repeatedly?

Yes

Does the outdoor fan motor rotate smoothly?

Yes

Replace the outdoor electronic control P.C. board.

Outdoor unit does not operate.

E Check of power supply

Check the connecting of parts of main power supply circuit.

Turn ON power supply.

Is there voltage of 208 / 230 VAC in the power supply terminal block?

Yes

Is the output voltage from the noise ﬁlter P.C. board 208 / 230 VAC?

Yes

Is the input voltage to the power board 208 / 230 VAC?

Yes

			Check the power supply cable.
	No		Check the power supply cable.
	No

			Replace the noise ﬁlter P.C. board.
	No		Replace the noise ﬁlter P.C. board.
	No

			Replace the reactor.
	No		Replace the reactor.
	No

Is the input voltage to the outdoor electronic
Is the input voltage to the outdoor electronic			Replace the power board.
control P.C. board 294 / 325 VDC?		No	Replace the power board.
control P.C. board 294 / 325 VDC?		No
	Yes

Replace the outdoor electronic control P.C. board.

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