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IV-11
SM831148
4. Service procedures
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(4) [Alarm "P22"] Outdoor unit fan motor drive circuit trouble
Are connectors CN003 and CN004 connected
correctly to the outdoor unit control PCB?
Correct the connector
connections.
Disconnect connectors CN003 and CN004
from outdoor unit control PCB, and rotate
fan by hand. Does it rotate easily?
Outdoor unit fan motor coil resistance is
OK if it is as shown below.
(1) Red – white: 30 – 40 Ω
(2) White – black: 30 – 40 Ω
(3) Black – red: 30 – 40 Ω
* Disconnect connector CN004 and
measure on the plug side.
Motor position detection circuit resis-
tance is OK if it is as shown below.
* Disconnect connector CN003 and measure
on the plug side.
(1) Grey – yellow: 100 kΩ or more, or
∞
(open)
(2) Grey – blue: 100 kΩ or more, or
∞
(open)
(3) Grey – orange: 100 kΩ or more, or
∞
(open)
Fan motor is OK; outdoor unit
control PCB has failed.
→ Replace.
Fan motor trouble
→ Replace.
Note:
In the case of a GND circuit failure inside the motor, the results
of the above check may be OK.
If operation is not OK after the outdoor unit control PCB has
been replaced, then replace the outdoor unit fan motor.