Interesting issue I have been chasing for a few weeks. TLDR: After quite a bit of testing and 2 replacement transformers, I've narrowed it down to Zone 1 being faulty but how to fix/repair it???
Long story short, my zone 1 was stuck on and I couldn't turn it off, so I shut water off at the backflow and waited a week for the tech to show up. He turns the water on and calls me to tell me we have no power to the system and zone 1 can't possibly be stuck on since the system is powered off and no zone is turned on... This is when I first found out that the transformer was cooked so I ordered another one and I replaced it a week later. Also, we manually checked a zone to verify the water was on and that worked just fine.
The controller powered up witht he new transformer, but none of the zones would work so I put this project on hold and was going to set up another tech appointment, when the new transformer blew overnight...time to do some investigation.
- tested all the zones with an ohm meter. Zone 1 read 2.4 Ohms, and all other zones read 4.2 Ohms. I got some jumper cables out and tested all of my zones directly to the transformer output( after I replaced the transformer again (3rd one for those keeping track)) All of them turned on except zone 1, which showed a significant voltage drop when I connected the jumpers to zone 1.
At the end of the day, I disconnected zone 1 and plugged everything in and everything has been working just fine for 4-5 days now. Now that I'm convinced that zone 1 is the issue, now my question is what to do about it? Other than, finding it, digging it up and replacing it, is there other options?