I have a controller with an A and B schedule. A for the back yard and B for the front. I replaced three valves in the front yard with the water turned off (due to a broken valve) Once I turned the water back on to the front, one of the stations in the back yard came on. Can someone help?
Define "turned the water back on" - if you open a supply valve, and a zone is flowing water when it shouldn't, that's a mechanical problem in the zone valve. Unplug the controller, if you aren't certain. If you operate a controller to turn on the system, and an unwanted zone is on, that might still be a valve problem. Or a defective controller. Or bad wiring.