Discharge Temperature - LG multi V PLUS Service Manual

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