get a multimeter and see what the controller is doing
does the system have a master valve?
I do not believe the system has a master valve but I'm not sure. There is no information from the original installation other than the controller manual.
I have a multimeter and can do basic things with it. What should I look for? Can I have the system start running with the water off and just check the connections to be sure each zone is getting the same voltage when its activated?