Daikin FTX25JVEA9 Service Manual page 248

Si18-201
1.5.3 Operation Halt Due to Fan Motor (AC Motor) or Related Abnormality
A6
Remote
Controller
Display
Indoor Unit LED A
Display
Note: No LED Display on FTK(X)25/35J Series.
Method of The rotation speed detected by the hall IC during fan motor operation is used to determine
abnormal fan motor operation.
Malfunction
Detection
Malfunction When the detected rotation speed is less than 50% of the HH tap under maximum fan motor
rotation demand.
Decision
Conditions
"
Supposed
"
Causes
"
"
"
"
Troubleshooting
Check No.15
Refer to P.309
Service Diagnosis
5 B 5
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 (1).
Detection error due to faulty indoor unit PCB (2).
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
Troubleshooting - Split Type Indoor Unit
YES
Check No. 15
Check hall IC
Is there an output?
YES
NO
Check the fan motor voltage.
Is it at the rated voltage?
YES
NO
YES
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 (2).
(PCB (1) for FTK(X)25/35J)
Replace the fan motor.
Replace the indoor unit PCB (2)
(PCB (2) for FTK(X)25/35J)
Replace the capacitor.
(Replace PCB (2).)
(PCB (2) for FTK(X)25/35J)
Replace the fan motor.
(MF003)
235