LG MULTI V 5 Manual Book page 42

Error No. Error Error Type Error Point
Error Type Error Point
No.
Float switch is open due
to rising of condensate
Float switch is open due to
04 Drain pump error water level because
rising of condensate water
04 Drain pump error level because of drain
of drain pump fault or
pump fault or drain pipe
drain pipe clogging.
clogging
n Error diagnosis and countermeasure flow chart
Is the drain pan filled
Is Float switch short
No
half with condensate
On measuring its
water? (half level of
resistance?
float switch)*
Yes
Yes
Replace Indoor PCB or
reconnect the connector
In indoor unit PCB
No
Is drain pump working?
Does the terminal voltage
(Sound/drain noise/
for drain pump has
contact etc.)
220V output?**
Yes
Yes
Replace Drain Pump
No
Drain pump blocked by Check the drain head height
foreign particles? and slope***
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.
float
Condensate water
Copyright ©2017 LG Electronics. Inc. All right reserved.
Only for training and service purposes
082
_TROUBLE SHOOTING GUIDE BOOK
Main Reasons
Main Reasons
1. Drain pump/float switch fault
1. Drain pump/float switch fault
2. Improper drain pipe location, clog-
2. Improper drain pipe location, clog-
ging of drain pipe
ging of drain pipe
3. Indoor unit PCB fault
3. Indoor unit PCB fault
No
Replace float switch
No
Replace indoor unit PCB
Checking float
switch
(Low position short 0 ohm )
(High position Open)
- 102 -
LGE Internal Use Only
float
A:Point to check rotating
Float switch Housing (CN-FLOAT)
[***] Standard of drain pipe head height / slope
MAX 450
Copyright ©2017 LG Electronics. Inc. All right reserved.
Only for training and service purposes
*** Indoor PCB drain pump connector
(Check input of 220V)
(Marked as CN-DPUMP)
- 103 -
LGE Internal Use Only
083
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