LG multi V PLUS, Service Manual

Page: 270 / 373

270 Trouble Shooting Guide
Self-diagnosis function
No
Check or replace the fan.
Yes
Is the indoor/outdoor fan normal?
No
Check installation condition so that
heat exchange is done.
Yes
Is heat exchange normally done?
No
Check LEV and check valve of
the outdoor/indoor unit
Yes
Is LEV or check
valve of outdoor/indoor
unit normal?
No
Replace the high pressure switch.
Yes
Is the high pressure switch normal?
No
Replace the PCB.
Yes
Is detection circuit of
the high pressure switch
normal?
No
Check pipe clogging or refrigerant
Yes
Is there shielding?
Check whether the service valve is opened.
• Remove shielding of the outdoor unit
• Check the indoor unit filter
Failure Checking Method
Fault diagnosis and Trouble shooting guide
24
109
140
Error Item
Error
Display No.
Major Error Occurrence Cause Meaning
High pressure
switch of outdoor
unit Compressor stops by
high pressure switch
of outdoor unit
• Failure of high pressure switch
• Check outdoor fan and shielding of heat
exchanger on cooling mode
• Check indoor fan and shielding of heat
exchanger on heating mode
• Clogging of compressor check valve
• Pipe size reduction by damage of refrigerant pipe
• Pulled out of indoor/outdoor LEV terminal
• Excessive filling of refrigerant
• Poor vacuum work
• Check communication lines of indoor units.
• Check LEV connection of indoor unit PCB.