LG ARNU Series - Page 265

Troubleshooting Guide
- 265 -
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■ Error diagnosis and countermeasure flow chart
1. Bad connection of low pressure connector
2. Defect of low pressure connector (Open/Short)
3. Defect of outdoor PCB
1. Bad connection of high pressure connector
2. Defect of high pressure connector (Open/Short)
3. Defect of outdoor PCB
Error
No.
Error Type Error Point Main Reasons
Abnormal value of
sensor
(Open/Short)
Abnormal value of
sensor
(Open/Short)
Sensor error of low
pressure
Sensor error of high
pressure
42 (Main)
117 (Sub1)
129 (Sub2)
158 (Sub3)
43 (Main)
116 (Sub1)
128 (Sub2)
157 (Sub3)
Pressure sensor connection
on main PCB
Is sensor connected
to PCB correctly?
Connect sensor to PCB correctly
Yes
No
No
After replacement of
outdoor unit main PCB
is the system normal?
Yes
Low pressure
sensor
High pressure
sensor
Replace corresponding
pressure sensor
END