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Runs briefly then shuts down, very high head

What is going on

Possible causes and checks for: runs briefly then shuts down, very high head.

Likely causes

  • Dirty condenser coil (leaves/grass), overcharge, failed compressor/fan motor, bent fan blade

Check in this order

  1. High condenser split
  2. Compressor trips internal overload
  3. Clean coil
  4. Trim vegetation
  5. Caution — discharge line very hot. (32F) p.881 [855]

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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.