LG multi V PLUS, Service Manual

Page: 273 / 373

Service Manual 273
Self-diagnosis function
Trouble shooting Flow
Fault diagnosis and Trouble shooting guide
34
143
145
Error Item
Error
Display No.
Major Error Occurrence Cause Meaning
34: High pressure rise of
main outdoor unit
143: High pressure rise
of Sub1 outdoor unit
145: High pressure rise
of Sub2 outdoor unit Compressor stops by
excessive rise of high
pressure
• Failure of high pressure sensor or high
pressure sensor detection circuit part
• Failure of indoor/outdoor unit fan
• Poor heat exchange by installation
conditions, damage of heat exchanger
• Clogging of discharge pipe
• Excessive filling of refrigerant
No No
Check or replace the PCB.
Yes
Yes
Replace the
pressure sensor.
Is discharge pressure actually high?
Is the pressure
sensor normal?
No
Check or replace the fan.
Yes
Is the fan of the indoor/outdoor
unit normal?
No
Check installation conditions 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
Recalculate and refill filling
quantity of refrigerant.
Yes
The quantity of additional filling of
refrigerant is correct?
No
Check pipe clogging or refrigerant
Yes
Is there shielding?
Check open status of the service valve.
• Remove shielding of the outdoor unit
• Check the indoor unit filter