Drain Pump Error - LG Multi V ARNU Series Service Manual

Self-diagnosis function
Error
Error Type
No.
04

Drain pump error

Error diagnosis and countermeasure flow chart
Is the drain pan filled
half with condensate
water? (half level of
float switch)*
Yes
Is drain pump working?
(Sound/drain noise/
contact etc.)
Yes
Drain pump blocked by
foreign particles?
Yes
Remove it & clean the pump
* If the float goes up higher than a half of float
switch then the circuit is open & the unit is
stopped automatically.
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Only for training and service purposes
Error Point
Float switch is open due to
rising of condensate water
level because of drain
pump fault or drain pipe
clogging
Is Float switch short
No
On measuring its
resistance?
Yes
Replace Indoor PCB or
reconnect the connector
In indoor unit PCB
No
Does the terminal voltage
for drain pump has
208/230V output?**
Yes
Replace Drain Pump
- 114 -
Main Reasons
1. Drain pump/float switch fault
2. Improper drain pipe location, clog-
ging of drain pipe
3. Indoor unit PCB fault
No
Replace float switch
No
Replace indoor unit PCB
LGE Internal Use Only