SiUS12-928_A
5.5
Fan Motor or Related Abnormality
5.5.1 AC Motor (Slim Duct Built-in System)
A6
Remote
Controller
Display
Method of
The rotation speed detected by the Hall IC during fan motor operation is used to determine
Malfunction
abnormal fan motor operation.
Detection
Malfunction
The detected rotation speed does not reach the demanded rotation speed of the target tap, and is
less than 50% of the maximum fan motor rotation speed.
Decision
Conditions
Layer short inside the fan motor winding
Supposed
Breaking of wire inside the fan motor
Causes
Breaking of the fan motor lead wires
Defective capacitor of the fan motor
Defective indoor unit PCB
Troubleshooting
Check No.16
Refer to P.158
Service Diagnosis
Be sure to turn off the power switch before connecting or disconnecting
Caution
connectors, or parts may be damaged.
Start operation.
Does the fan rotate?
NO
Turn off the power supply and
rotate the fan by hand.
Does the fan rotate
smoothly?
YES
Turn the power on and check the
fan motor voltage. (immediately
after restart)
Is it the rated voltage? ∗
YES
Check the capacitor's continuity.
Is there continuity?
NO
YES
Check No. 16
Check Hall IC
Is there an output?
NO
YES
Check the fan motor voltage.
Is it the rated voltage? ∗
YES
∗ Measure the voltage between
the red and black lead wires of
the fan motor, and check if the
maximum voltage reaches the
NO
rated voltage.
YES
Troubleshooting
NO
Replace the fan motor or the
indoor unit PCB.
Replace the fan motor.
NO
Replace the indoor unit PCB.
Replace the fan motor.
Replace the indoor unit PCB.
Replace the capacitor.
(Replace the indoor unit PCB.)
Replace the fan motor.
(R11411)
106