Hunter SRV Valve Won't Shut Off: Flush, Replace Diaphragm, or Swap Valve Internals

One of Four Hunter SRV Valves Stays Open; Cleaned, Swapped Solenoid, Swapped Wires

You’ve done the right checks. Next:

Flush the valve: remove bonnet, take out diaphragm, run water through to clear debris.
Replace the diaphragm.
If still stuck, buy a replacement SRV valve and swap the diaphragm, solenoid, and lid as a unit.

Be careful not to flood the box or introduce new debris.

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