Fan Motor (Ac Motor) Or Related Abnormality - Daikin FTKS20CVMB Service Manual

SiENBE04-401A
4.4

Fan Motor (AC Motor) or Related Abnormality

A6
Remote control
Display
The rotation speed detected by the Hall IC during fan motor operation is used to determine
Method of
abnormal fan motor operation.
Malfunction
Detection
When the detected rotation speed is less than 50% of the HH tap under maximum fan motor
Malfunction
rotation demand.
Decision
Conditions
Supposed
Causes
Troubleshooting
Check No.16
Refer to P.145
Service Diagnosis
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.
Be sure to turn off power switch before connect or disconnect connector,
Caution
or parts damage may be occurred.
Operate the fan.
Does it rotate?
NO
Rotate the fan by hand.
Does it rotate smoothly?
YES
Check the fan motor voltage.
(immediately after re-start)
Is it at the rated voltage?
YES
Check the capacitor's conductivity
Is there conductivity?
NO
YES
Check No. 16
Check Hall IC
Is there an output?
YES
NO
Check the fan motor voltage.
Is it at the rated voltage?
YES
NO
YES
Troubleshooting
NO Replace the fan motor or indoor unit
PCB.
Replace the fan motor
∗2 Measure the voltage between the
red and black lead wires of the fan
motor, and check if the maximum
voltage reaches the rated voltage.
NO
Replace indoor unit PCB (1).
Replace the fan motor.
Replace the indoor unit PCB (1)
Replace the capacitor.
(Replace PCB (1).)
Replace the fan motor.
(R4096)
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