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Frost/sweat on suction line to compressor

What is going on

Possible causes and checks for: frost/sweat on suction line to compressor.

Likely causes

  • Overcharge
  • Stuck/broken thermostat
  • (cap tube too large)

Check in this order

  1. Correct charge by weight
  2. Replace stat
  3. Liquid floodback washes out oil, breaks valves

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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.