Mitsubishi Electric PKFY-WL04NLMU-E.TH Technical & Service Manual page 22

2 FCV operation
(a)
(f)
(b)
(c)
(e)
9-1-3. DC Fan motor (fan motor/indoor controller board)
Check method of indoor fan motor (fan motor/indoor controller board)
Notes
· High voltage is applied to the connector (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 causes trouble of the indoor controller board and fan motor.)
Self check
Conditions : The indoor fan cannot rotate.
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 board
TEST POINT
: V
DC
TEST POINT
: V
CC
Is the voltage normal?
No
Replace indoor
controller board.
Check the operation.
Fail
Replace the defective fan motor.
TCH122
(a) Close
(b) Open
(c) Fully open valve (85 pulses)
(d) Fully close valve (770 pulses)
(e) No. of pulses
(f) Valve opening degree
(d)
Replace the defective fan motor.
Replace the indoor controller board.
Yes
Correct wiring.
(between 1 (+) and 4 (-) of the fan connector): V
(between 5 (+) and 4 (-) of the fan connector): V
Yes
OK
Complete.
.
295-325 VDC
DC
15 VDC
CC
Replace the defective fan motor.
Check the operation of fan.
Fail
Replace indoor controller board.
22
OK
Complete.