LG ARUV Series Service Manual page 265

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