Mitsubishi Electric PUHZ-W50VHA-BS Service Manual page 53

Check method of DC fan motor (fan motor / outdoor controller circuit board)
Notes
· High voltage is applied to the connector (CNF1, 2) for the fan motor. Pay attention to the service.
· Do not pull out the connector (CNF1, 2) of the motor with the power supply on.
(It may damage the outdoor controller circuit board and fan motor.)
Self check
Symptom: The outdoor fan does not run.
Check fuse (F5) on outdoor controller
circuit board.
Is the fuse normal?
Yes
Wiring contact check
Check contact of fan motor connector
(CNF1) (CNF2)
Is there contact failure?
No
Power supply check
Measure the voltage on the outdoor controller circuit.
(W50/85 : Remove the connector CNF1. / HW112/140 : Remove the connectors CNF1 and CNF2.)
TEST POINT
V DC 280-380 V (between 1 (+) and 4 (-) of CNF1)
DC
V DC 15 V
CC
Is the voltage normal?
No
Replace outdoor controller circuit board.
fan motor rotation.
Check
NG
Replace fan motor.
OCH439H
No
Replace fan motor.
Replace
Yes
Recover wiring.
(between 5 (+) and 4 (-) of CNF1)
Yes
Replace fan motor.
Check
Replace outdoor controller circuit board.
OK
END
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outdoor controller circuit board.
OK
fan motor rotation.
NG
END