Air-Conditioner Service Manual

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[11 error]

[12 error]

Check indoor main P.C. board (MCC-1370A).

Defect Replace

Check power voltage. Improve line.

Check and eliminate noise, etc.

YES

Is there no turbulence of power supply?

Indoor fan starts rotating by inserting receptacle.

[Check output voltage (DC) of P.C. board fan motor.]

Measure the voltages of the motor connector

CN210 Pin 3 (GND (minus): Black) and Pin 5 (V line (plus): Yellow)

under condition that indoor fan rotates.

DC1.0V or more

6 (Blue)

5 (Yellow)

4 (White)

3 (Black)

2 –

1 (Red)

DC1.0V or less

CN210

Yellow

Black

P.C. board

Defective

indoor main P.C. board

(MCC-1370A)

Defective indoor fan motor