I was planning to disconnect the M anyway to for some of my testing…
My thoughts for testing are:
- Disconnect M and see if the system will run. If there a master valve is wired, but maybe stuck open as Gene suggested, will it run without the option checked in the app, as it is now?
- Disconnect M and use my toner connected to M and grounded to a metal stake. See if I can trace it. I would think I should at least be able to get a tone inside the valve box on the commons and whichever colored wire leads to M. Might even be able to trace at ground level??
Using the tracer, I may be able to pick up the common wire and locate the “missing” valve boxes. I also have a very good metal detector that may be of some value.