Hey I have a gen 3, it’s been hot and dry by me so I ran a 5min quick run now zone 1 won’t shut off. I tried manual. I held down the stop button now 1 blue dot and a flashing yellow bar
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Do you know the location of valve 1? That is usually indicative of an issue at the valve itself( i.e. solenoid, trash in the valve not allowing to close etc.).
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Your problem is a bad valve; the diaphragm is not functioning or, there is something lodge in the valve causing constant pressure to the diaphragm causing it not to shut. Turn off the water supply and unscrew the valve, check for foreign matters lodged, if nothing there get a new valve; gut out the old one and install the new guts from the new valve.