![background image](http://html1.mh-extra.com/html/daikin/ft25cv1a/ft25cv1a_service-manual_2459308101.webp)
Troubleshooting
Si01-406
90
Service Diagnosis
4.4
Fan Motor or Related Abnormality
(A6)
4.4.1
AC motor
(FT25/35CV1A, FTY25/35CVMA)
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 the HH 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.122
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.
∗
∗
Summary of Contents for FT25CV1A
Page 7: ...Si01 406 vi Table of Contents...
Page 15: ...Functions Si01 406 4 List of Function...
Page 21: ...Specifications Si01 406 10 Specifications...
Page 205: ...Wiring Diagrams Si01 406 194 Appendix...
Page 209: ...Si01 406 iv Index...