LG MULTI V IV ARNU12GTU 2 Series User Manual

Troubleshooting Guide
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Copyright ©2013 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
n Error diagnosis and countermeasure flow chart
1. Defective high pressure switch
2. Defective fan of indoor unit or outdoor unit
3. Check valve of compressor clogged
4. Pipe distortion due to the pipe damage
5. Refrigerant overcharge
6. Defective LEV at the indoor or outdoor unit .
7. Covering or clogging(Outdoor covering dur-
ing the cooling mode /Indoor unit filter clog-
ging during the heating mode)
8. SVC valve clogging
9. Defective outdoor PCB
Error
No.
Error Type Error Point Main Reasons
Compressor off due to the
high pressure switch in
outdoor unit
Excessive rise of discharge
pressure in outdoor com-
pressor
24*
Master
241
Slave1
242
Slave2
243
Slave3
244
Is high pressure switch
connector connected
to PCB?*
No
Note 1)
Note 2) Note 2)
Connect securely
Is high pressure switch
connector short
during off time?**
Yes
No
Is this error appeared
again after reset?
Yes
No
Is SVC valve open?
Yes
Re-check momentary
problem or not
Replace connecting cable
Open SVC valve
No
Yes
Is high pressure switch
terminal short?***
No
Replace high pressure switch
Yes
Is high pressure
more than 2500kPa
at manifold gauge?
No
Replace PCB
CH24 : inverter compressor PCB
CH109~154 : sub unit PCB
Yes
Is high pressure of
LGMV similar as
at manifold gauge?
No
Replace high pressure sensor
Yes
Check pipe is blocked or
not and take measure
Note 1) High pressure switch
connector on Main PCB
Note 2) Check short with high
pressure switch connector

LG MULTI V IV ARNU12GTU 2 Series Specifications

General

Brand	LG
Model	MULTI V IV ARNU12GTU 2 Series
Category	Air Conditioner
Language	English