SiBE18-821_C Troubleshooting for RA Indoor Unit
Troubleshooting 355
4.3 Fan Motor or Related Abnormality
4.3.1 AC Motor (Duct Connected Type, Floor / Ceiling Suspended Dual Type)
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
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.
Supposed
Causes
îš„
Layer short inside the fan motor winding
îš„
Breaking of wire inside the fan motor
îš„
Breaking of the fan motor lead wires
îš„
Defective capacitor of the fan motor
îš„
Defective indoor unit PCB
Troubleshooting
Check No.16
Refer to P.362
NO
NO
NO
Check No. 16
Check Hall IC
NO
NO
NO
YES
YES
YES
YES
YES
YES
(R11411)
Caution
Replace the fan motor or 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.
Replace the fan motor.
Replace the indoor unit PCB.
Does the fan rotate?
Is there an output?
Is it the rated voltage? ∗
Does the fan rotate
smoothly?
Is it the rated voltage? ∗
Is there continuity?
Start operation.
Turn off the power supply and
rotate the fan by hand.
Check the fan motor voltage.
Turn the power on and check the
fan motor voltage. (immediately
after restart)
Check the capacitor's continuity.
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
∗ Measure the voltage
between the red and black
lead wires of the fan motor,
and check if the maximum
voltage reaches the rated
voltage.
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