Panasonic R410A service manual Service procedures, Alarm P22

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 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 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

Fan motor is OK; outdoor unit control PCB has failed.

→Replace.

No

No

4

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.

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