16
7-1-3. DC Fan motor (fan motor/indoor controller circuit board)
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 causes trouble of the indoor controller circuit
board and fan motor.)
Self check
Symptom : The indoor fan cannot turn around.
Yes
NG
NG
NG
Wiring contact check
Contact of fan motor connector (CNMF)
Power supply check (Remove the connector (CNMF))
Measure the voltage in the indoor controller circuit
board.
TEST POINT
: V
DC
(between 1 (+) and 3 (-) of the fan connector): V
DC
DC294~325V
TEST POINT
: V
CC
(between 4 (+) and 3 (-) of the fan connector): V
CC
DC15V
Wiring recovery
Replace indoor controller board.
Replace indoor controller board.
Replace the fan motor
Replace the fan motor
Indoor controller board fuse check
Replace indoor
controller board
Replace the fan motor.
Is the voltage normal?
Is there contact failure?
No
Yes
No
No
Is the fuse normal?
Replace the fuse
Yes
Check the operation
END
OK
Check the operation
END
Check the operation
END
OK
Check the operation
END
OK
NG
OK
Check method of DC fan motor (fan motor/indoor controller circuit board)
Sensor signal check
Measure the voltage between CNMF and DC 0V
and DC 15V in the indoor controller circuit board.
Does the voltage repeat
DC 0V and DC 15V?
No
Yes
