LG universal system air conditioner Service Manual page 99

Troubleshooting Guide
Product doesn't operate with the remote controller.
Trouble 2
Turn on main power.
While the compressor has been stopped, the compressor does not operate
owing to the delaying function for 3 minutes after stopped.
When the compressor stopped Indoor Fan is driven by a low speed.
At this point the wind speed is not controlled by the remote controller.
(When operated in the Sleeping Mode, the wind speed is set to the low speed as force.)
Caused by other parts except
Caused by the remote controller.
the remote controller
When the mark ( ) is displayed in LCD Check the contact of CN-DISP 1 connector
screen, replace battery.
When the detect switch (double key) inside the
Check DISP PWB Ass'y
remote controller door is fault, it is impossible to
-Voltage between CN1 - : DC +5V
operate temperature regulating( / ) and wind
speed selecting.
Check the Display PWB Ass'y • Check receiver ass'y
Service Manual 99