LG ARUV Series Service Manual page 233

2.2 Fan Motor
Checking Item
(1) The fan motor does not
operate.
Does failure appears
again when starting
operation?
(2) Vibration of the fan
motor is large.
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Symptom
1) When power supply is
abnormal
2) For wrong wiring
3) For failure of motor
4) For defective fuse
5) For failure of circuit board
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Checking Method for Key Components
Countermeasure
* Modify connection status in front of or at the rear of
the breaker, or if the power terminal console is at
frosting condition.
* Modify the power supply voltage is beyond speci-
fied scope.
* For following wiring.
1. Check connection status.
2. Check contact of the connector.
3. Check that parts are firmly secured by tightening
screws.
4. Check connection of polarity.
5. Check short circuit and grounding.
* Measure winding resistance of the motor coils.
Main outdoor unit: INV [19.0±7%Ω(75˚C)]
Sub outdoor unit: Main [22.8±7%Ω(75˚C)]
R1 [34.8±7%Ω(75˚C)]
R2 [3.7±7%Ω(75˚C)]
* Replace the fuse if there is defect (Fuse 800V
30A).
Replace the circuit board in following procedures if
problems occur again when powering on and if
there are no matters equivalent to items as speci-
fied in above 1) through 4).
(Carefully check both connector and grounding
wires when replacing the circuit board.)
1. Replace only fan control boards.
If starting is done, it means that the fan control
board has defect.
2. Replace both fan control board and the main
board.
If starting is done, it means that the main board
has defect.
3. If problems continue to occur even after counter-
measure of No.1 and No.2, it means that both
boards has defect.
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