No
Check or replace current detection
sensor or inverter PCB
Yes
Is the current normal?
No
Check the outdoor, indoor unit fan.
Yes
Is the outdoor/indoor
unit fan normal?
No
Check input power.
Yes
Is input power normal?
No
Check the LEV of outdoor/indoor unit
and Check valve
Yes
Is the LEV of outdoor/indoor unit and
Check valve normal?
No
No
Replace the compressor.
Yes
Check pipe clogging or refrigerant
Is insulation
resistance or coil resistance of
compressor normal?
No
Replace the compressor
Yes
Yes
Is the compressor
stopped? or is there any abnormal
vibration?
Is there shielding?
Measure actual current.
• Remove shielding of the outdoor unit
• Check the indoor unit filter
Failure Checking Method
Fault diagnosis and Trouble shooting guide
22
Error Item
Error
Display No.
Major Error Occurrence CauseMeaning
Maximum over
current (MAX CT)
or minimum
current
Over current or
minimum current flows
• 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)
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