About 1.5 months ago, I replaced my old Pre-2005 Rainbird ESP-8TM controller with a Rachio Gen 3 12 Zone controller from Costco.
Wiring was pretty basic, moved the 8 zone wires and COM wire from the Rainbird to the Rachio. As I have no outlet near this controller, I did not hook up the Rachio Transformer but opted to reuse the Rainbird transformer that was pre-exisiting from the Rainbird (which also requires 24VAC) into the Rachio 24VAC slots. Incoming power from the transformer was measured with a multimeter at 27.6 VAC.
Up until this past Sunday, all was running fine without issue. I attempted to run the system manually via my phone app Sunday and found the controller is offline. There were no issues with the home wifi. I then went to look at the controller itself and found no lights on. I could not run the controller manually either. I disconnected the power wires for 15ish minutes in hopes it would reset. I hook them back up, issue still existed. Held down the Stop button for 10 seconds to try manual reset. Did not work.
Called customer support, they are sending a new transformer but I do not think this is the issue. Shouldn’t the system work with the 24VAC wires already hardwired and installed into the 24VAC slots? Perhaps I am missing something here???
As a side note, to keep newly seeded portions of my lawn watered on these 88+ deg F days, I have hooked the Rainbird controller back up and all zones are back to working without issue. I would really love to go back to the Rachio for the functionality and ability to control from anywhere.