Compressor/Outdoor Fan Are Unable To Drive - LG LS-M3021CL Service Manual

3. Compressor/Outdoor Fan are unable to drive.

Operate "Cooling Mode(
When in Air Circulation Mode, Compressor/Outdoor Fan is stopped.
Check the sensor for indoor temperature is attached as close as to be effected by the tempera-
ture of Heat Exchanger(EVA).
When the sensor circuit for indoor temperature and connector are in bad connection or are not
engaged, Compressor/Outdoor Fan is stopped.
• Check the related circuit of R02H(12.1K), R04H(6.2K), Micom (No.3.4) (Indoor unit).
• Check the related circuit of R04H (6.2K) Micom (No.3) (Output unit).
• Check the indoor temperature sensor is disconnected or not(About 10kΩ / at 25°C).
Check Relay(RY - COMP2) for driving compressor.(Outdoor unit)
• When the power(About AC220V/240V) is applied to the connecting wire terminal support
transferred to compressor, PWB Ass'y is normal.
• Check the circuit related to the relay.
Between Micom(No.15) and GND
Between Relay (G5N-1A) (No.1)
and (G5N-1A) (No.4)
Between CN-COMP2
and CN-POWER 2(N)
• Check the electrical wiring diagram of outdoor side.
• Check the abnormal condition for the component of Compressor/Outdoor Fan Motor.
• Check the "open" or "short" of conmecting wires between indoor and outdoor.
Turn on Main Power
)" by setting the desired temperature of the remote controller is less
than one of the indoor temperature by 1°C at least.
Check point
Turn off Main Power
COMP ON
DC5V
DC12V
AC 220~240V
- 57 -
COMP OFF
DC0V
DC0V
Below AC 10V