Mitsubishi Electric PUHZ-W90VHA Service Manual page 20

Check method of DC fan motor (fan motor / outdoor controller circuit board)
Notes
· High voltage is applied to the connector (CNF1) for the fan motor. Give attention to the service.
· Do not pull out the connector (CNF1) of the motor with the power supply on.
(It may damage of the outdoor controller circuit
Self check
Symptom : The outdoor fan does not run.
Check fuse (F5) on outdoor control
circuit board.
Is the fuse normal?
Yes
Wiring contact check
Contact of fan motor connector (CNF1)
Is there no contact failure?
Yes
Power supply check
Measure the voltage on the outdoor controller circuit. (The connector CNF1 is removed.)
TEST POINT V DC280-330V (between 1 (+) and 4 (-) of CNF1)
DC
V DC15V
DC
Is the voltage normal?
No
Replace outdoor control circuit board.
fan motor rotation.
Check
NG
Replace fan motor.
board and fan motor.)
No
Replace fan motor.
Replace
No
Wiring recovery
(between 5 (+) and 4 (-) of CNF1)
Yes
Replace fan motor.
Check
Replace outdoor control circuit board.
OK
END
outdoor controller circuit board.
OK
fan motor rotation.
NG
20
END