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SiBE12-933_A
Troubleshooting
Service Diagnosis
177
4.4
Fan Motor or Related Abnormality
4.4.1 AC Motor
Remote
Controller
Display
A6
Method of
Malfunction
Detection
The rotation speed detected by the Hall IC during fan motor operation is used to determine
abnormal fan motor operation.
Malfunction
Decision
Conditions
When the detected rotation speed does not reach the demanded rotation speed of the target
tap, and is less than 50% of the maximum fan motor rotation speed.
Supposed
Causes
Operation halt due to short circuit inside the fan motor winding.
Operation halt due to breaking of wire inside the fan motor.
Operation halt due to breaking of the fan motor lead wires.
Operation halt due to faulty capacitor of the fan motor.
Detection error due to faulty control PCB.
Troubleshooting
Check No.16
Refer to P.221
(R7132)
Operate the fan.
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Does it rotate?
YES
Rotate the fan by hand.
NO
Does it rotate smoothly?
Check the fan motor voltage.
(immediately after restart)
Is it at the rated voltage?
∗
NO
YES
Check the capacitor's continuity
Is there continuity?
YES
NO
YES
NO
Check No. 16
Check Hall IC
Is there an output?
Check the fan motor voltage.
Is it at the rated voltage?
∗
YES
YES
NO
NO
Replace the fan motor or control
PCB.
Replace the fan motor.
Replace control PCB.
Replace the fan motor.
Replace the control PCB.
∗
Measure the voltage between
the red and black lead wires of
the fan motor, and check if the
maximum voltage reaches the
rated voltage.
Replace the capacitor.
(Replace the control PCB.)
Replace the fan motor.