LG TB-H488RSS5, Service Manual, Page: 12 / 42

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6. Defrost Control
• Defrost control is available for 45 minutes since heating mode operation is started, and it will not prolong over
10 minutes.
• Defrost control is carried out when the outdoor pipe temp. falls below -6°C for more than 3 minutes after 45
minutes are passed from starting of heating operation.
• Defrost ends after 10 minutes are passed from starting of defrost operation or when the outdoor pipe temp.
rises to 12°C after 5 minutes are passed from starting of defrost.
7. Self-diagnosis Function
• 'CHECK' : Please contact your dealer if the remote controller displays this message 'CHECK'.
• Rectify the problem 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
CH 01 Indoor room temperature thermistor error
CH 02 Indoor piping thermistor error
CH 03 Indoor main body / Remote controller unit communication error
CH 04(Optional) Water level float switch error
More than 45 minutes
of heating operation
Within
9min. 45sec.
ON OFF
N O N O
ON
ON OFF
OFF COMPRESSOR
4-WAY VALVE
INDOOR FAN
-6°C ON
12°C OFF
The outdoor
piping Temp.
ON
More than 10 min.
running of compressor
More than 45 minutes
of heating operation
5sec.
HOT-
START
ON