When Heating Does Not Operate - LG LS-C1863R/W/B/D/M/CM0 Service Manual

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.63) and GND
Between IC02M
(NO.14) and GND
• 4 way Relay
Check point
Between Micom
(NO.51) and GND
Between IC03M
(No.9) and GND
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
About 12V
Below DC1V
• Outdoor fan Relay
Check point Fan ON
Between Micom
DC 5V
(NO.53) and GND
Between IC03M
Below DC 1V
(NO.11) and GND
Troubleshooting Guide
Fan OFF
DC 0V
About DC 12V
Service Manual 53