LG ARNU Series, Service Manual

Page: 128 / 226

Troubleshooting Guide
128 Indoor Unit
Indoor Unit drain
pump error
Error
Code
Error Contents Meaning Main Causes
Error display
position
04
In case of the Indoor Unit
drain pump defect the con-
densed water level rises and
float switch (sensor) detects
the error .
Concerned
Remote controller
Panel Display
1. Defective drain pump / float switch
2. Defective drain (hose chocked /
improper inclination )
3. Defective PCB in the Indoor Unit
■
Defect inspection method :
1) Check the proper functioning of the drain pump in case of any drain water? (Functioning sound / check the
water flowing)
2) In case the drain pump is not working properly, then check the 220V power supply at the drain pump terminal
with a tester.
In case the drain pump do not function properly after power supply to the to the PCB, then replace the drain
pump.
3) In case of no power at the PCB terminal, then replace the Indoor Unit PCB.
4) In case the drain pump is OK, then check whether the hose is chocked or the drain pipe is improper and make
sure to correct the drain flow error if any.
5) In case the drain pump is OK and there is no drain water in drain pan and still the error code is displayed?
Then check whether the float sensor is touching the chassis. In case the float switch sensor is not touching the
chassis and still the error code exists, then the float switch has the error. In such a case, the drain pump
assembly must be replaced.
Drain Pump connector