Part 4 Trouble Shooting
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Error No.
Error Type
Error Point
Main Reasons
04
Drain pump error
Float switch is open due to
rising of condensate water
level because of drain
pump fault or drain pipe
clogging
1. Drain pump/float switch fault
2. Improper drain pipe location, clogging
of drain pipe
3. Indoor unit PCB fault
■
Error diagnosis and countermeasure flow chart
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
DC 15V 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
(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)
Condensate water
6.6 Troubleshooting Indoor Error
CH 04 (Drain pump error)
