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1st time to turn on this year
Controller was off. I turned the water on and 1 zone started running. What do I check
Probably the controller is trying to irrigate. First check your time setting on the controller.
Find the valve that's stuck on and repair it or adjust it. Worst case scenario you'll have to replace it.
Check to see if the solenoid is loose. Turn it clockwise until it's snug. Don't over tighten. Do you see any leaking?