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Well Pump Blows Pressure Relief Valve When Zone Activates

Well pump system: when zone activates, pump blows water out pressure relief valve, zone doesn't run. Manual valve opening works fine.

Valve Not Opening Electrically

The zone valve isn't actuating from the controller. Possible causes:

Controller not sending signal
Wiring break to valve
Failed solenoid
Failed diaphragm

Diagnostic Resource

Visit irrigationtutorials.com for step-by-step electrical troubleshooting guide to isolate which component is at fault.

Quick Test

Manually open valve (bleed screw or solenoid twist)
If pump runs normally → Valve mechanism OK, problem is electrical
Test controller voltage at zone terminal (22-26 VAC)
Test voltage at valve solenoid

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