Sprinkler zone turns on automatically

Discussion in 'Irrigation / Sprinkler Forum' started by nate.barclay, Apr 10, 2010.

  1. nate.barclay

    nate.barclay New Member

    May 25, 2007
    Hello all. I just turned on my water today to my sprinkler system to be met with an odd surprise. As soon as I turn the valve from the back flow assembly to the sprinkler line, one of my zones fires up and I have no way of controlling it other than to turn the valve back off. I can flip my sensor switch on the wall unit to bypass and test the other zones, but I can't get this one zone to shut off. Any ideas? Thanks.

  2. Fireguy97

    Fireguy97 Irrigation Contractor

    Mar 21, 2010
    Irrigation Contractor / Certified Backflow Assembl
    Kamloops, in Beautiful British Col
    You could have either a bad solinoid, a stuck solinoid, or whoever winterized your system open the valves manually (by turning the solinoid) and left that one open.

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  4. hj

    hj Moderator & Master Plumber Staff Member

    Aug 31, 2004
    Cave Creek, Arizona
    Most valves WILL operate when the water is first turned on because they have lost their pressurization, but they turn off as soon as the valve chamber fills with water. You either have a damaged diaphragm, bad solenoid valve, or the manual control is turned on.
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