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Thermal overload trips repeatedly

What is going on

Possible causes and checks for: thermal overload trips repeatedly.

Likely causes

  • High ambient / poor airflow around compressor
  • Dirty or blocked condenser (high head)
  • Low oil
  • Shorted windings
  • High suction pressure (hot pull-down)
  • Liquid floodback

Check in this order

  1. Airflow around compressor, condenser cleanliness and head pressure, amps vs RLA, oil level, winding resistance/megohm, suction pressure on start

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Source: General HVAC service practice — verify per model. Written in our own words; check the manual for your exact model.

For licensed technicians. Gas, electrical and refrigerant work must be done by a qualified, licensed person. Shut off power and gas before servicing, never bypass a safety control, and follow the manufacturer’s manual for the exact model; it and local codes always take priority. HVACopedia is not affiliated with any manufacturer; brand and model names only identify the equipment.