SiBE01-503 Troubleshooting
Service Diagnosis 61
4.4 Fan Motor or Related Abnormality (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 is less than 50% of each tap under maximum fan motor
rotation demand.
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 indoor unit PCB.
Troubleshooting
Check No.16
Refer to P.69
Rotate the fan by hand.
Check No. 16
Check Hall IC
Operate the fan.
Does it rotate?
NO
Does it rotate smoothly?
Is there an output?
Is it at the rated voltage?
Is there conductivity?
NO
Check the capacitor's conductivity
Check the fan motor voltage.
(immediately after re-start)
Is it at the rated voltage?
Check the fan motor voltage.
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
Replace the fan motor or indoor unit
PCB.
Replace the fan motor.
Replace indoor unit PCB.
Replace the fan motor.
Replace the indoor unit PCB.
Replace the capacitor.
(Replace PCB.)
Replace the fan motor.
(R3197)
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
∗ Measure the voltage between the
red and black lead wires of the fan
motor, and check if the maximum
voltage reaches the rated voltage.
∗
∗
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