Daikin FTYN25GXV1B, Service Manual, Page: 70 / 97

SiBE01-829 Troubleshooting
Service Diagnosis 59
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
NO
NO
NO
Check No. 16
Check Hall IC
NO
NO
NO
YES
YES
YES
YES
YES
YES
(R8504)
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Replace the fan motor or control
PCB.
Replace the fan motor.
Replace control PCB.
∗
Measure the voltage between
the white 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.
Replace the fan motor.
Replace the control PCB.
Does it rotate?
Is there an output?
Is it at the rated voltage?
∗
Does it rotate smoothly?
Is it at the rated voltage?
∗
Is there conductivity?
Operate the fan.
Rotate the fan by hand.
Check the fan motor voltage.
Check the fan motor voltage.
(immediately after re-start)
Check the capacitor's conductivity