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Valve won't open/close

What is going on

Possible causes and checks for: valve won't open/close.

Likely causes

  • Coil burned or no signal, plunger stuck, wrong NC/NO type, pilot-operated valve with insufficient pressure differential, installed backward

Check in this order

  1. Coil voltage/continuity, click on energize, pressure differential, flow arrow

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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.