LG ATNH126ELFB Service Manual page 98

Electronic Parts Troubleshooting Guide
3. When cooling does not operate
Operate "Cooling Mode(
remote controller is less than one of the indoor temperature by 1°C at least.
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 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 indoor temperature sensor is disconnected or not(About 10kΩ / at 25°C).
Check Relay(RY - COMP) for driving compressor.
• 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.
102 Universal System Air Conditioner
Turn on Main Power
)" by setting the desired temperature of the
Check point
Between two pin of DC
part in relay for COMP
COMP ON COMP OFF
Below DC 1V
About DC12V
(app)