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Valve not responding / wrong superheat

What is going on

Possible causes and checks for: valve not responding / wrong superheat.

Likely causes

  • Lost steps (needs re-initialization)
  • Wrong refrigerant selected in controller P/T table
  • Bad pressure transducer or temperature sensor
  • Controller power (24 Vac in, 12 Vdc to motor)
  • Valve stuck

Check in this order

  1. Compare controller superheat to measured, verify transducer/thermistor readings, re-initialize (power cycle), refrigerant setting, %-open display

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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.