R-Pro › Field cases › Refrigeration systems
Compressor Seizure / Lock-up
Likely causes
Seizure from oil shortage
Check: Measure starting current (≥6–8× rated = seizure suspected)
What to do: Measure starting current (≥6–8× rated = seizure suspected) → Check winding and insulation resistance → If high pressure is elevated, recover some refrigerant and retry start → If restart fails, recover all refrigerant → Verify oil quantity and spec, then replace compressor → Evacuate and recharge
Mechanical damage from liquid refrigerant slugging
Check: Check winding and insulation resistance
What to do: Check winding and insulation resistance → If high pressure is elevated, recover some refrigerant and retry start → If restart fails, recover all refrigerant → Verify oil quantity and spec, then replace compressor → Evacuate and recharge
Seized after prolonged shutdown
Check: If high pressure is elevated, recover some refrigerant and retry start
What to do: If high pressure is elevated, recover some refrigerant and retry start → If restart fails, recover all refrigerant → Verify oil quantity and spec, then replace compressor → Evacuate and recharge
Power and control signals are normal but the compressor is mechanically seized. Compressor replacement required. Never open the refrigeration circuit without recovering refrigerant.
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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