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Hard starting / stalls on restart

What is going on

Possible causes and checks for: hard starting / stalls on restart.

Likely causes

  • Low voltage (≥10% low) on PSC motor
  • Restart before pressures equalize

Check in this order

  1. Wait for equalization
  2. Add start cap + relay per A1. pp.835, 844 [809, 818]

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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.