Compressor thermal trip repeats

Question

Accepted Answer

Suction pressure too low (refrigerant shortage). Check: Measure suction and discharge pressures What to do: Measure suction and discharge pressures → Check refrigerant charge — inspect sight glass for bubbles → Check and clean condenser fins → Clean or replace suction strainer → Check oil level and color → Inspect machine room ventilation Condensing pressure too high (condenser fouling). Check: Check refrigerant charge — inspect sight glass for bubbles What to do: Check refrigerant charge — inspect sight glass for bubbles → Check and clean condenser fins → Clean or replace suction strainer → Check oil level and color → Inspect machine room ventilation Insufficient or contaminated refrigeration oil. Check: Check and clean condenser fins What to do: Check and clean condenser fins → Clean or replace suction strainer → Check oil level and color → Inspect machine room ventilation Suction filter clogged. Check: Clean or replace suction strainer What to do: Clean or replace suction strainer → Check oil level and color → Inspect machine room ventilation Ambient temperature excessively high. Check: Check oil level and color What to do: Check oil level and color → Inspect machine room ventilation

Compressor thermal trip repeats

Likely causes

Suction pressure too low (refrigerant shortage)

Condensing pressure too high (condenser fouling)

Insufficient or contaminated refrigeration oil

Suction filter clogged

Ambient temperature excessively high

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