LG ARNU Series, Service Manual

Page: 148 / 226

Troubleshooting Guide
148 Outdoor Unit
Excessive rise in
outdoor high
pressure
Error
Code
Error Contents Meaning Main Causes
Error display
position
24
Compressor Off due to the
high pressure switch in
outdoor unit
Concerned
Remote con-
troller
Panel Display
Outdoor unit
1. Defective high pressure switch
2. Defective Indoor or Outdoor fan
3. Chocked compressor check valve
4. Pipe chocked due to the pipe dam-
age
5. Refrigerant overcharge
6. Defective LEV at the Indoor or
Outdoor Unit .
7. Covering or chocking (Outdoor cov-
ering during the cooling mode /
Indoor Unit filter chocking during
the heating mode)
8. SVC valve chocking
9. Defective Outdoor PCB
■
Defect inspection method
1) In case the Indoor / Outdoor Unit fan is not working normally, please check and replace them if required.
(Refer to CH105~CH108)
2) Check whether Indoor / Outdoor Unit heat exchange is being accomplished successfully.
Otherwise, check and modify the installation condition as per the required heat exchange.
In case of heat exchanger covering please remove the outdoor condenser covering and also check the Indoor
Unit filter.
3) Is the actual pressure reached high enough for the high pressure switch to be operational.
Connect the manifold gauge at the high pressure service valve and compare the value of the high pressure
sensor.
4) Check whether the SVC valve is open and other conditions(fold, dent etc) .
5) In case the pressure is not high enough for the high pressure switch to come into action, then please check the
high pressure switch.
In case, after temporary shorting of the pressure switch of the inverter and constant speed compressor on one
by one if there is no error code display, then please replace the concerned high pressure switch.
In case the error code is displayed after shorting the high pressure switch, then please replace the concerned
PCB.
6) Required refrigerant re-calculation and check the refrigerant recharging condition.
7) Check whether the temperature of the both ends of the check valve are similar ?
In case a temperature difference is sensed, then please replace the check valve.