LB-D1860HL — LG Air Conditioner Service Manual (repair manual). Page 38

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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.
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 
10minutes
Defrost
Defrost
More than 45 minutes of
heating operation
7. 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.
Remote controller LCD
Accident Point
F
1
Indoor temperature thermistor error
F2
Indoor piping thermistor error
F3
Indoor unit & remote controller
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