LG L2-C242GL0, Service Manual

Page: 44 / 75

44 Multi Air Conditioner
Electronic Parts Troubleshooting Guide
6. When Heating does not operate
Operate “Heating Mode( )” by setting the desired temperature of the
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 connector of intake and pipe sensor(thermistors)
• Check the related circuit of R02H(12.1K), R01H(1.0K), R04H(6.2K),
R03H(1.0K).
• Check the indoor room temperature is disconnected or not (about
10K
Ω
/at 25°C).
• Check the indoor pipe temperature is disconnected or not (about
5K
Ω
/at 25°C).
Turn ON Main Power
Check Outdoor Unit
Check the DC voltage on the PWB ASS’Y
• The details of check are as followings
Check point
Between two pin
of DC part in relay
for COMP.
Comp ON
Below DC 1V
Comp OFF
About DC
12V
Check point
Between two pin
of DC part in relay
for 4-way.
4-Way ON
Below DC 1V
4-Way OFF
About DC 12V
• Comp Relay. • 4-Way Relay