Friedrich SP05A10 service manual When the fan motor does not operated, Low

Troubleshooting

5-2-5 When the fan motor does not operated

1)Check points

(1)Is the voltage of the power source normal ? (the rating voltage ±10% range. )

(2)Is the electric wire in good contact ?(CN71, RY71)

(3)Is the starting condenser(FAN MOTOR) in good contact?

(4)Is the fan motor connector in good contact?(CN73)

(5)Is the output voltage of the IC01(KA7812) and IC02(KA7805) normal ?

Turn off the power, and then turn it on again five

seconds later.

N

Dose the buzzer sound, when the power on?

Y

Check whether the "COOLING ICON" LED lamp is on	N
and the operation starts when pressing the
on/off button of the remocon.

Go to the clause "No power".

•Go to the clause of "when the remocon does not operated".

Y

Is the IC03 output normal?		N
- When the fan motor is High, IC03 No. 12 pin →
	Low.
- When the fan motor is Med, IC03 NO. 14 pin →	LOW.
- When the fan motor is Low, IC03 No. 15 pin →	Low.

•Check the IC03 for a short and cold soldering.

•Replace the IC03.

Y

Does the relay(RY 72, 73,74) operate normally?

-When the fan motor is High, RY74 should operate.

-When the fan motor is Med, RY73 should operate.

-When the fan motor is Low, RY72 should operate.

Y

Is the fan motor normal?

Y

Replace the fan motor.

N

N

•Check the relay coil resistance. (Normal: About 400Ω )

•Replace the relay.

•Check the fan motor resistance.

(0Ω : short, ∞Ω : open)

• Check the fan motor thermal fuse?

FRIEDRICH AIR CONDITIONING CO. 5-7