Mitsubishi Electric TRANE CITY MULTI TPKFYP004LM140A Technical & Service Manual page 29

9-1-3. DC Fan motor (fan motor/indoor controller board)
Check method of indoor fan motor (fan motor/indoor controller board)
Notes
1
· High voltage is applied to the connector (CNMF) for the fan motor. Pay attention to the service.
· Do not pull out the connecter (CNMF) for the motor with the power supply on.
(It causes trouble of the indoor controller board and fan motor.)
Self check
2
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
TEST POINT
1 : V
DC
TEST POINT 2 : V
CC
Is the voltage normal?
No
Replace indoor
controller board.
Check the operation.
Fail
Replace the defective fan motor.
OCHT715A
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
Replace the defective fan motor.
Replace indoor controller board.
OK
Complete.
board.
294/325 V DC
DC
15 V DC
CC
Check the operation of fan.
Fail
29
OK
Complete.