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All brands · Refrigeration troubleshooting

High-pressure control trips

What is going on

Possible causes and checks for: high-pressure control trips.

Likely causes

  • No condenser airflow (fan motor burnt, relay stuck, blocked airway), no condenser water flow, dirty condenser, excessive load

Check in this order

  1. Cut-out should be ~20% above normal head
  2. Table A31
  3. Cycle ≥3× on gauges after any adjustment

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Calculators and reference tables

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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.