Self-diagnosis function
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Only for training and service purposes LGE Internal Use Only
1. Drain pump/float switch fault
04 Drain pump error
2. Improper drain pipe location, clog-
ging of drain pipe
3. Indoor unit PCB fault
Error
No. Error Type Error Point Main Reasons
■Error diagnosis and countermeasure flow chart
Float switch is open due to
rising of condensate water
level because of drain
pump fault or drain pipe
clogging
Is the drain pan filled
half with condensate
water? (half level of
float switch)*
Is drain pump working?
(Sound/drain noise/
contact etc.)
Replace float switch
Replace Indoor PCB or
reconnect the connector
Yes
Yes
No
No Is Float switch short
On measuring its
resistance?
No
Yes
Drain pump blocked by
foreign particles?
Yes
In indoor unit PCB
Does the terminal voltage
for drain pump has
220V output?**
Replace indoor unit PCB
Replace Drain Pump
Yes
Remove it & clean the pump
➠
No
➠
* If the float goes up higher than a half of float
switch then the circuit is open & the unit is
stopped automatically.