I'm in the process of doing a cleanup job and moving a well pump for a customer. We replaced the pump, all three valves and the pump start relay, then started reconnecting and repairing all the pipes to the zones. Zone 1 is working fine and has good pressure. Zone 2 works fine and has good pressure, but every time I try to run Zone 3 I get "3 err". I read about Rain Bird controllers having this issue so I replaced the controller with a new ESP-4M controller and get the same "3 err" code. So I thought maybe it's a bad valve, so I replaced #3 valve with a new valve and get the same error. I called Rain Bird and they said it sounds like a bad wire or connection, I pulled off all the grease caps, clipped all the ends and reconnected the wires...same error again. I plan on replacing all the wiring this afternoon, but other than that I have run out of things to try. Any ideas for the next step in resolving this "3 err" would be greatly appreciated.