Mitsubishi Electric PUHZ-SHW230YKA2 Service Manual page 28

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) for the motor with the power supply on.
(It causes trouble of the outdoor controller circuit
Self check
Symptom : The outdoor fan cannot rotate.
Fuse check
Check the fuse (F5) on outdoor
controller board.
Did the fuse blow?
No
Wiring contact check
Contact of fan motor connector (CNF1, 2)
Is there contact failure?
No
Power supply check (Remove the connector (CNF1, 2))
Measure the voltage in the outdoor controller circuit
TEST POINT
1 : V (between 1 (+) and 4 (−) of the fan connector): V
DC
TEST POINT 2 : V (between 5 (+) and 4 (−) of the fan connector): V
CC
Is the voltage normal?
No
Replace the outdoor
controller board.
Check the operation.
Fail
Replace the defective fan motor.
OCH594B
board and fan motor.)
Yes
Replace outdoor controller board
(C.B) and the defective fan motor (MF1, 2).
Yes
Correct the wiring.
board.
Yes
Replace the defective fan motor.
Check the operation of fan.
Replace the outdoor controller board.
OK
Complete.
250–330 V DC
DC
15 V DC
CC
Yes
Fail
28
OK
Complete.