I have one zone that will not shut off. It runs with all the other zones thus reducing the pressure on all of them. I replaced the diaphram and solenoid but this did not solve the problem. When I purchased the solenoid two small pieces (they looked like bushings of spaces of some kind) that were inside the body fell out. I asked the salesman how they went back in and he told me that I no longer needed these pieces. I threw them away but I suspect that he was wrong and that I did need the pieces ...
