SERVICE MANUAL - Alarko Carrier

(4) Indoor fan motor automatically starts to rotate by turning on power supply
The IC is built in the indoor fan motor. Therefore the P.C. board is also mounted to inside of the motor.
If the P.C. board is soldered imperfectly or the IC is defective, the fan motor may automatically rotate by turning
on power supply.
1. Remove the front panel. (Remove 2 screws.)
2. Remove the cover of the fan motor lead wires.
3. Check DC voltage with CN10 connector while the fan motor is rotating.
NOTE :
• Do not disconnect the connector while the fan motor is rotating.
• Use a thin test rod.
Indoor fan starts rotating when power supply is turned on.
P.C. board
(Check output DC voltage of fan motor on P.C. board.)
Measure voltage between 3 (GND : BLACK)
and 5 (V line : YELLOW) of motor connector (CN10)
while indoor fan motor is rotating.
Yellow
Black
CN10
6 (Blue)
5 (Yellow)
4 (White)
3 (Black)
2 –
1 (Red)
DC 1.0V or more
Under DC 1.0V
DC
P.C. board is defective.
Motor is defective.
Replace P.C. board.
Replace motor.
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