LG LAN181CNW, LAU181CNW, LA180CPI, LA180CPO Service Manual page 56

Cycle Troubleshooting Guide
3. The product is not operate with the remote controller.
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 by force.)
Cause by the remote controller
When the mark( ) is displayed in LCD screen, replace
battery.
When the detect switch(double key) inside the remote
controller door is fault, it is impossible to operate
temperature regulating( / ) and wind speed selecting.
Check the connecting circuit between the remote controller
MICOM (No. ) - R17(2 ) - IR LED - Q1 - R16(2.2K ).
56 Room Air Conditioner
While the compressor has been stopped, the compressor does not
operate owing to the delaying function for 3 minutes after stopped.
Turn on Main Power
Caused by other parts except the remote controller
Check the contact of CN-D1/D2 connector.
Check DISP PWB Ass'y
- Voltage between CN-D2
Check point
• Check the connecting circuit between PIN - R75(1K)
- C71(1000PF) - MICOM PIN
• Check Receiver Ass'y
: DC + 5V
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