R-Pro › Field cases › Air conditioning
Inverter Overcurrent Error (Excessive Compressor Load)
Likely causes
Refrigerant overcharge causing liquid slugging and overload
Check: Note error code and identify cause in manufacturer manual
What to do: Note error code and identify cause in manufacturer manual → Cut inverter power, wait 5 minutes, then attempt restart → During restart, measure running current with clamp meter (vs. rated) → Measure high/low side pressures (check for overcharge or condenser fault) → If error repeats, measure compressor winding and insulation resistance
High compression ratio from elevated head pressure
Check: Cut inverter power, wait 5 minutes, then attempt restart
What to do: Cut inverter power, wait 5 minutes, then attempt restart → During restart, measure running current with clamp meter (vs. rated) → Measure high/low side pressures (check for overcharge or condenser fault) → If error repeats, measure compressor winding and insulation resistance
Compressor internal bearing wear
Check: During restart, measure running current with clamp meter (vs. rated)
What to do: During restart, measure running current with clamp meter (vs. rated) → Measure high/low side pressures (check for overcharge or condenser fault) → If error repeats, measure compressor winding and insulation resistance
The inverter has detected overcurrent and stopped the compressor as protection. Eliminate the compressor load cause. Bypassing the inverter to apply direct power risks compressor burnout and defeats safety protection — fire hazard.
All 565 cases work offline in R-Pro, with error codes for 62 brands and P-T data for 108 refrigerants.
Open R-Pro →