LB-F3680HL, LB-F3680CL — LG Air Conditioner Service Manual (repair manual). Page 70

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6. Defrost Control
• Defrost operation is controlled by  timer and sensing the outdoor piping temperature.
• The defrost starts only when the outdoor pipe temperature falls below -6°C after 45 minutes passed from starting
of heating operation.
• Defrost ends after 10 minutes passed from starting of defrost operation or when the outdoor pipe
temperature rises over 12°C even if before 10 minutes.
7. Auto Restarting Operation
• When the power is restored after a sudden power failure while in appliance operation, the mode before the
power failure is kept on the memory and the appliance should be on the automatically operates in the mode on
the memory.
• Operation Mode that is kept on the memory
- State of Operation ON/OFF
- Operation Mode/Setting Temp/Selected Airflow Speed
• If no input by the remote controller within 7 hr after the appliance operates by the Auto Restarting operation,
the appliance is forced to stop at the moment of 7-hr elapse.
8. Self-Diagnosis Function
• 'CHECK' will flash in the remote controller display when a problem occurs. Then please contact your dealer.
• Correct the accident point as shown in the table below before restarting operation.
• During the normal operation 'CHECK' won't be displayed in the remote controller.
–13–
More than 45 minutes of
heating operation
Outdoor Pipe Temp.
Indoor Fan
Compressor
4-Way Valve
ON
ON
ON
ON
OFF
ON
OFF
HOT-
START
ON
ON
OFF
OFF
ON
12
°
C
(Defrost OFF)
-6
°
C
(Defrost ON)
Within 
10 minutes
Defrost
Defrost
More than 45 minutes of
heating operation
Remote controller LCD
Accident Point
F
1
Indoor temperature thermistor error
F2
Indoor piping thermistor error
F3
Indoor/Outdoor unit communication error
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