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Won't cut in / won't cut out

What is going on

Possible causes and checks for: won't cut in / won't cut out.

Likely causes

  • Faulty stat
  • Calibration

Check in this order

  1. Bypass test
  2. Ice-water (32°F) and 45°F bath contact test
  3. Data logger
  4. H
  5. Replace if points don't open/close or chatter

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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.