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Compressor Motor Overload (Winding Fault)

Likely causes

Inter-turn winding short causing overcurrent

Check: Measure winding resistance between all terminal pairs (check 3-phase symmetry)

What to do: Measure winding resistance between all terminal pairs (check 3-phase symmetry) → Measure insulation resistance terminal-to-body (≥1MΩ) → Compare operating current to rated → Measure supply voltage balance (≤3% imbalance) → If replacement decided, recover refrigerant and replace

Winding insulation degraded from repeated overheating

Check: Measure insulation resistance terminal-to-body (≥1MΩ)

What to do: Measure insulation resistance terminal-to-body (≥1MΩ) → Compare operating current to rated → Measure supply voltage balance (≤3% imbalance) → If replacement decided, recover refrigerant and replace

Increased internal mechanical friction

Check: Compare operating current to rated

What to do: Compare operating current to rated → Measure supply voltage balance (≤3% imbalance) → If replacement decided, recover refrigerant and replace

Field tip

Compressor motor overload from winding fault. Measure winding and insulation resistance, then consider replacement. Continued operation with shorted winding causes burnout and carbonized oil contaminating the entire circuit.

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