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Starting Member


Wednesday, April 24th 2013, 8:11pm

Well Pressure Drops to zero when I turn on 1 Zone

I recently changed my well pump out. It was a 1/2hp and I put the same type in. My sprinker system which has 6 zones run perfectly. When I changed the pump zones 1,3-6 all run perfect. When zone 2 turns on my pressure drops to zero and my pump shuts off so the zone never comes on. I can hold the pressure switch to on and the pressure will build back up slowly, when it gets to 20psi I can let it go and the zone runs perfectly. Can you give me any suggestions?


Supreme Member

Posts: 5,323

Location: Metro NYC


Wednesday, April 24th 2013, 9:32pm

Too much flow, or at least too much initial flow. Double check for leaks, and if your zone valve has a flow control, throttle it down.

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