Daikin AT12BV1LS Pocket Manual page 28

Si10-417
5.1.3 Fan Motor (AC Motor) or Related
Abnormality
Remote
Controller
Display
Method of
Malfunction
Detection
Malfunction
Decision
Conditions
Supposed
Causes
Trouble
shooting
Check No.16
Refer to
P.167
Service Diagnosis
A6
The rotation speed detected by the Hall IC during fan
motor operation is used to determine abnormal fan
motor operation.
When the detected rotation speed is less than 50% of
the HH tap under maximum fan motor rotation demand.
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
Caution disconnect connector, 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
YES
A
NO
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 the indoor
unit PCB (1)
YES
Replace the capacitor.
(Replace PCB (1).)
Replace the fan
motor.
27