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Superheat above target

What is going on

Possible causes and checks for: superheat above target.

Likely causes

  • Undercharge
  • Liquid-line restriction
  • Metering device malfunction (underfeeding)
  • Moisture in system (freezing at orifice)
  • Excessive heat load

Check in this order

  1. Leak check & charge
  2. Check temp drop across drier/line
  3. Check orifice
  4. Replace drier/evacuate
  5. Check load/airflow

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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.