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10-8. DC FAN MOTOR (FAN MOTOR/INDOOR CONTROLLER BOARD)
Notes
· High voltage is applied to the connecter (CNMF) for the fan motor. Give 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 circuit
board and fan motor.)
Self check
Symptom : The indoor fan cannot turn around.
No
NG
NG
Wiring contact check
Contact of fan motor connector (CNMF)
Check the fuse (FUSE) on indoor
controller board.
Power supply check (Remove the connector (CNMF))
Measure the voltage in the indoor controller circuit
board.
TEST POINT
1 :VDC (between 1 (+) and 4 (-) of the fan connector): VDC DC310~340V
TEST POINT 2 :VCC (between 5 (+) and 4 (-) of the fan connector): VCC DC15V
Wiring recovery
Replace drain pump (DP).
Replace indoor controller board.
Replace the fan motor.
Replace indoor controller board (I.B).
Replace fan motor (MF).
Replace indoor
controller board.
Replace the fan motor.
Is the voltage normal?
Is there no contact failure?
Ye s
1
2
Ye s
No
Did the fuse blow?
Check the drain pump (DP)
Is the resistance between
terminals normal?
No
Ye s
Ye s
No
Check the operation of fan. END
Ye s
OK
Check the operation. END
OK
Check method of DC fan motor (fan motor/indoor controller circuit board)