LG CT18 NQ2 - Page 69

4. Trouble Shooting
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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
No
In indoor unit PCB
Does the terminal voltage
for drain pump has
220V output?**
Replace indoor unit PCB
Replace Drain Pump
Yes
Check the drain head height
and slope***
Remove it & clean the pump
float
Checking float
switch
No
Condensate water
(Low position short 0 ohm )
* If the float goes up higher than a half of float
switch then the circuit is open & the unit is
stopped automatically.
(High position Open)
6.6 Troubleshooting Indoor Error
CH 04 (Drain pump error)