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New Member


Wednesday, June 24th 2015, 9:50am

Valve stuck open - Zone always on

My zone 4 keeps getting stuck open. The only way I can get it to turn off is by pulling the fuse for the well pump. Turning off the timer/controller has no effect. Even unplugging the timer from power does nothing. Then, the only way I can seem to get it to reset and close is by having the timer unplugged and well pump fuse pulled for a couple of hours. I cannot for the life of figure out what is happening. I cleaned out the valve, replaced the whole top half of the valve (diaphragm,solenoid), but still have the problem. Could it possibly by the timer causing the issue? Would that be the next thing to replace? Help is greatly appreciated!!


Supreme Member

Posts: 5,269

Location: Metro NYC


Wednesday, June 24th 2015, 12:18pm

It's fairly easy to confirm whether the controller is activating that valve solenoid, simply by unscrewing the solenoid while you have the valve apart. What make and model of valve?


New Member


Wednesday, June 24th 2015, 1:33pm

Its a Nelson 7901. I will take the solenoid off tonight and see if its being activated.

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