Maximum Over Current (Max Ct) Or Minimum Current - LG multi V PLUS Service Manual

Self-diagnosis function
Fault diagnosis and Trouble shooting guide
Error
Error Item
Display No.
Maximum over
current (MAX CT)
or minimum
current
22
Failure Checking Method
Measure actual current.
Is the current normal?
Is the outdoor/indoor
unit fan normal?
Is input power normal?
Is the LEV of outdoor/indoor unit and
Check valve normal?
Is insulation
resistance or coil resistance of
compressor normal?
Is there shielding?
Is the compressor
stopped? or is there any abnormal
vibration?
• Remove shielding of the outdoor unit
• Check the indoor unit filter
268 Trouble Shooting Guide
Meaning
Over current or
minimum current flows
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
Yes
No
Major Error Occurrence Cause
• Pulled out or loose of inverter compressor
terminal
• Defective compressor
• Clogging of pipe
• Defective current detection sensor
• Low/high input voltage
• Failure of outdoor/indoor fan
• Excessive charge of refrigerant
• Failure of outdoor/indoor LEV/Check Valve
• Shielded (Outdoor unit shielded on cooling mode/
Indoor unit filter clogged on heating mode)
Check or replace current detection
sensor or inverter PCB
Check the outdoor, indoor unit fan.
Check input power.
Check the LEV of outdoor/indoor unit
and Check valve
Replace the compressor.
Check pipe clogging or refrigerant
Replace the compressor