Black & Decker MUZ-FD09NA- U1, MUZ-FD12NA I Check of outdoor fan motor, J Check of power supply

Outdoor fan motor does not operate.

I Check of outdoor fan motor

Disconnect CN932 from the inverter P.C. board, and measure the resistance of the outdoor fan motor.

Is the outdoor fan motor normal?
			Replace the outdoor fan motor.
(Refer to 10-4.)		No
	Yes

Replace the inverter P.C. board.

Inverter does not operate.

J Check of power supply

Disconnect the connector (CN61) between compressor and intelligent power module.

Turn ON power supply and press EMERGENCY OPERATION switch.

Does POWER lamp on the indoor
unit light up?		No
	Yes

Is there voltage 280 ~ 370 VDC between DB61 (+) and DB61 (–) on

the inverter P.C. board?Yes (Refer to 10-6.1.)

No

Check the electric parts in main circuit.

Rectify indoor/ outdoor connecting wire.

Yes

Is there voltage 208 / 230 VAC between the indoor terminal block S1 and S2?

Dose LED on the inverter P.C. board light up or flash? (Refer to 10-6.1.)

Yes

If light up, OK.

If flash, refer to 10-3.

Replace the indoor No electronic control P.C.

board.

Replace the inverter No P.C. board.

280 ~ 370 VDC

DB61

Inverter P.C. board (Solder side)

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