I had that happen up north. The valve sticks open due to most likely dirt so the valve cannot shut its water off so the only way to whoa it down is turn the water off. You might get lucky and take one of the zone’s sprinkler heads off, run it for a few with that head off to suck the dirt out of the controller. If that don’t work it’s only four screws to take off and replace the guts or the controller. At least here they put the valve in a known box. Up north I had to locate them in the middle of the yard and not a fun project at all.
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I will say the things that others are probably thinking but afraid to say.
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