Mitsubishi Electric PLFY-P05NFMU-E Technical & Service Manual page 23

8-2-3. DC Fan Motor (Fan Motor/Indoor Controller Board)
Check method of indoor fan motor (fan motor/indoor controller board)
1 Notes
· High voltage is applied to the connecter (CNMF) for the fan motor. Pay attention to the service.
· Do not pull out the connector (CNMF) for the motor with the power supply on.
(It will damage the indoor controller board and fan motor)
Self check
2
Conditions : The indoor fan cannot turn around.
Indoor controller board fuse check
Is the fuse normal?
Yes
Wiring contact check
Contact of fan motor connector (CNMF)
Is there contact failure?
No
Power supply check (Remove the connector (CNMF))
Measure the voltage in the indoor 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 indoor
controller board.
Check the operation.
Fail
Replace the fan motor.
OCH604A
Is the resistance
between the terminals of
drain pump normal?
No
Replace the drain pump.
Yes
Wiring recovery
board.
Yes
Replace the fan motor.
Check the operation of fan.
Replace the indoor controller board.
OK
COMPLETE
23
Replace the fan motor.
Replace the indoor controller board.
310–340 V DC
DC
15 V DC
CC
OK
COMPLETE
Fail