Some Valves Stopped Working

Hi - after working well for a couple of weeks, the front yard (4 valves) stopped working through the app or manually through the rachio unit. They were not disabled as that happened on one last time and this forum helped me with that. The rachio unit and App act like they are going on but the valves just don’t turn on. I checked the wiring which has been in place for years with my old timer. I also manually turned on each valve at the valve and confirmed they work. Thoughts? I really need a reliable sprinkler timer.

To me it sounds very likely that the common wire that feeds those four zones has a poor connection somewhere, but probably in the manifold where the 4 valves are mounted.

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