R-Pro › Field cases › Air conditioning
Inverter Instability from Pressure Abnormality
Likely causes
Repeated inverter shutdown from high-pressure switch
Check: Measure both high-side and low-side pressures simultaneously
What to do: Measure both high-side and low-side pressures simultaneously → High pressure rising: check condenser (fan, fouling) → Low pressure dropping: check for refrigerant leak or expansion device blockage → Fix pressure issue and confirm inverter error does not recur
Frequent restarts from low-pressure switch
Check: High pressure rising: check condenser (fan, fouling)
What to do: High pressure rising: check condenser (fan, fouling) → Low pressure dropping: check for refrigerant leak or expansion device blockage → Fix pressure issue and confirm inverter error does not recur
Compressor protection triggered by refrigerant shortage
Check: Low pressure dropping: check for refrigerant leak or expansion device blockage
What to do: Low pressure dropping: check for refrigerant leak or expansion device blockage → Fix pressure issue and confirm inverter error does not recur
Even with stable power, abnormal pressure (high or low) is causing inverter instability.
All 565 cases work offline in R-Pro, with error codes for 62 brands and P-T data for 108 refrigerants.
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