LG LSC121PMA Service Manual - Page 45

Compressor/Outdoor Fan are unable to drive.

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4. Compressor/Outdoor Fan are unable to drive. Turn on Main Power Operate "Cooling Mode( )" by setting the desired temperature of the remote controller is less than one of the indoor temperature by 2°F at least. When in Fan Mode, Compressor/Outdoor Fan is stopped. Check the sensor for indoor temperature is attached as close as to be effected by the temperature 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 R02(12.1K), R04(6.2K), Micom (No.27) (Indoor unit). • Check the indoor temperature sensor is disconnected or not(About 10kΩ / at 25°C). When the temperature around Outdoor PWB Ass'y is above 163°F the compressor is stop and only Outdoor Fan is operating. Check Relay(RY - COMP) for driving compressor. • When the power(About AC200V) is applied to the connecting wire terminal support transferred to compressor, PWB Ass'y is normal. • Check the circuit related to the relay(Outdoor unit). Check point COMP ON COMP OFF Between Micom(No. 15) and GND DC5V DC0V Between IC8(No. 16) and GND IC0M(No.16) Below DC 1V (app) About DC12V Turn off Main Power • Check the electrical wiring diagram of outdoor side. • Check the abnormal condition for the component of Compressor/Outdoor Fan Motor. - 45 -

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4. Compressor/Outdoor Fan are unable to drive.
Turn on Main Power
Operate "Cooling Mode(
)" by setting the desired temperature of the
remote controller is less than one of the indoor temperature by 2°F at least.
When in Fan Mode, Compressor/Outdoor Fan is stopped.
Check the sensor for indoor temperature is attached as close as to be
effected by the temperature 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 R02(12.1K), R04(6.2K),
Micom (No.27)
(Indoor unit).
• Check the indoor temperature sensor is disconnected or not(About 10k
Ω
/ at 25°C).
When the temperature around Outdoor PWB Ass'y is above 163°F the
compressor is stop and only Outdoor Fan is operating.
Turn off Main Power
• Check the electrical wiring diagram of outdoor side.
• Check the abnormal condition for the component of Compressor/Outdoor
Fan Motor.
Check Relay(RY - COMP) for driving compressor.
• When the power(About AC200V) is applied to the connecting wire terminal
support transferred to compressor, PWB Ass'y is normal.
• Check the circuit related to the relay(Outdoor unit).
Check point
COMP ON
COMP OFF
Between Micom(No.
DC5V
DC0V
15) and GND
Between IC8(No. 16)
Below DC 1V
About DC12V
and GND IC0M(No.16)
(app)