4. Service procedures
(4) [Alarm "P22"] | Outdoor unit fan motor drive circuit trouble |
Are connectors CN003 and CN004 connected correctly to the outdoor unit control PCB?
Yes
Disconnect connectors CN003 and CN004 from outdoor unit control PCB, and rotate fan by hand. Does it rotate easily?
Yes
No
No
Correct the connector
connections.
Outdoor unit fan motor coil resistance is
OK if it is as shown below.
* Disconnect connector CN004 and | No | |
measure on the plug side. | ||
|
(1)Red – white: 30 – 40 Ω
(2)White – black: 30 – 40 Ω
(3)Black – red: 30 – 40 Ω
Yes
Motor position detection circuit resis- tance is OK if it is as shown below.
* Disconnect connector CN003 and measure | No |
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)
Yes |
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Fan motor is OK; outdoor unit | Fan motor trouble | 4 | |
→ Replace. | |||
control PCB has failed. | |||
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→ Replace. |
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Note: |
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In the case of a GND circuit failure inside the motor, the results |
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of the above check may be OK. |
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If operation is not OK after the outdoor unit control PCB has |
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been replaced, then replace the outdoor unit fan motor. |
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| SM831148 | |
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