LG multi V PLUS, Service Manual

Page: 272 / 373

272 Trouble Shooting Guide
Self-diagnosis function
Replace the temperature sensor.
Is the temperature
sensor of the compressor discharge
pipe normal?
Replace LEV.
Is LEV of indoor/outdoor unit normal?
Replace PCB. Is the outdoor unit PCB normal?
Modify wiring.
Are communication lines normal?
Check liquid injection valve switch. Is the liquid injection valve normal?
Check the hot gas bypass valve. Is the hot gas bypass valve normal?
Refill refrigerant.
Is refrigerant filling quantity calculated
suitably for the pipe length?
Check heat insulation status of the pipe.
Check open status of the service valve.
Check leakage of refrigerant.
Check the gas pipe strainer.
Failure Checking Method
Fault diagnosis and Trouble shooting guide
32
33
100
101
102
103
Error Item
Error
Display No.
Major Error
Occurrence Cause
Meaning
32: Discharge temperature of main outdoor unit
inverter compressor
33: Discharge temperature of main outdoor unit
constant speed compressor
100: Discharge temperature of Sub1 outdoor unit
No.1 constant speed compressor
101: Discharge temperature of Sub1 outdoor unit
No.2 constant speed compressor
102: Discharge temperature of Sub2 outdoor unit
No.1 constant speed compressor
103: Discharge temperature of Sub2 outdoor unit
No.2 constant speed compressor
• Defective temperature sensor of
compressor discharge pipe
• Insufficient refrigerant
• Failure of LEV
• Failure of liquid injection valve
• Leakage of hot gas bypass valve
• Insufficient open of liquid pipe service
valve on heating mode
• Poor heat insulation of pipe on
heating mode
Compressor stops
by high discharge
temperature of
compressor
No
No
No
No
No
No
No
Yes
Yes
Yes
Yes
Yes
Yes
Yes