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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 - and that is why my zone will not close. It is a Nelson solenoid. I am going back to see the salesman tomorrow but would appreciate any input just in case this proves not to be the problem.