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Troubleshooting Guide
When Heating does not operate
Operate "Heating Mode(
remote control is higher than one of the indoor temperature by 2°C at
least.
In heating Mode, the indoor fan operates in case the pipe temperature
is higher than 28°C.
• Check the related circuit of RY-4WAY
• Check the indoor room temperature is disconnected or not (about
10KΩ/at 25°C).
• Check the indoor pipe temperature is disconnected or not (about
5KΩ/at 25°C).
• The details of check are as followings
• Comp Relay.
Check point
Between Micom
(NO.59) and GND
Between IC01M
(NO.15) and GND
• 4 way Relay
Check point
Between Micom
(NO.51) and GND
Between IC02M
(NO.11) and GND
Copyright ©2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Turn ON Main Power
)" by setting the desired temperature of the
Check the connector of intake and pipe sensor(thermistors)
Check the DC voltage on the PWB ASSEMBLY
Comp ON
Comp OFF
DC 5V
DC 0V
Below DC 1V
About DC
12V
4 way ON
4 way OFF
DC 5V
DC 0V
Below DC 1V
About DC 12V
• Outdoor fan Relay
Check point
Between Micom
(NO.53) and GND
Between IC02M
(NO.12) and GND
- 68 -
Fan ON
Fan OFF
DC 5V
DC 0V
Below DC 1V
About DC 12V
LGE Internal Use Only
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