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Shuts off, won't run

What is going on

Possible causes and checks for: shuts off, won't run.

Likely causes

  • Float switch tripped (clogged drain), frost control open (coil below freezing, long runs or cool room)

Check in this order

  1. Clear drain
  2. Allow fan to clear frost
  3. Normal cycling. p.962 [936]

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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.