R-Pro › Field cases › Refrigeration systems

Compressor Overheating from High Condensing Pressure

Likely causes

Condenser coil/fin fouled with dust or grease

Check: Clean condenser fins (reverse-direction compressed air)

What to do: Clean condenser fins (reverse-direction compressed air) → Measure fan motor current and check rotation direction → Ensure ≥30 cm clearance around condenser → Check for refrigerant overcharge (subcooling 5–8°C target) → If pressure remains high, purge non-condensable gas

Condenser fan faulty or wrong rotation direction

Check: Measure fan motor current and check rotation direction

What to do: Measure fan motor current and check rotation direction → Ensure ≥30 cm clearance around condenser → Check for refrigerant overcharge (subcooling 5–8°C target) → If pressure remains high, purge non-condensable gas

Hot air recirculation from insufficient clearance

Check: Ensure ≥30 cm clearance around condenser

What to do: Ensure ≥30 cm clearance around condenser → Check for refrigerant overcharge (subcooling 5–8°C target) → If pressure remains high, purge non-condensable gas

Refrigerant overcharge

Check: Check for refrigerant overcharge (subcooling 5–8°C target)

What to do: Check for refrigerant overcharge (subcooling 5–8°C target) → If pressure remains high, purge non-condensable gas

Non-condensable gas (air) present

Check: If pressure remains high, purge non-condensable gas

What to do: If pressure remains high, purge non-condensable gas

Field tip

High condensing pressure increases compression ratio and discharge temperature. Improve condenser heat rejection. If discharge temperature exceeds 135°C continuously, oil carbonization and internal damage risk is high. Stop immediately and fix root cause.

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