I installed my system about 15 years ago and I have maintained it over the years. I had this problem once before, but was able to fix it by installing a new solenoid on the valve. This time however, that procedure had no effect. The zone will come on fine by turning the valve in the valve box. It just won't come on electircally via the controller.
So, I got my multimeter and tested the resistance at the controller, and all zones except that one measure 0 ohms. What does that mean and what do I do from here? Does that mean there is potentially a broken wire? Bad controller? Where do I go from here?
Thanks to anyone who can help!