LG MULTI V Service Manual page 115

Error
Error Type
No.
Excessive rise of discharge
24 pressure in outdoor com-
pressor
n Error diagnosis and countermeasure flow chart
Is high pressure switch
connector connected
to PCB?
Note 1)
Yes
Is high pressure switch
connector short
during off time?
Note 2)
Yes
Is SVC valve open?
Yes
Is this error appeared
again after reset?
Yes
Is high pressure
more than 2500 kPa
at manifold gauge?
Yes
Is high pressure of
LGMV similar as
at manifold gauge?
Yes
Check pipe is blocked or
not and take measure
Error Point
Compressor off due to the
high pressure switch in
outdoor unit
No
Connect securely
No
Is high pressure switch
terminal short?***
Yes
Replace connecting cable
No
Open SVC valve
No
Re-check momentary
problem or not
Replace PCB
No
No
Replace high pressure sensor
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
No
Replace high pressure switch
Note 2)
Note 1) High pressure switch
Note 2) Check short with high
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Self-diagnosis function
Main Reasons
connector on Main PCB
pressure switch connector