Need a little input guys. On a system I installed, one of the zones is running continually, even when the timer is set in the off position. During manual zone operation at the timer, the zone shuts off! When returned to auto, the zone turns back on again, when it shouldn't be. I replaced valve and solenoid, but same results. Could the problem be the timer? I am planning to swap wiring on that station with another zone to see if it does the same on another valve. Any thoughts? the controller is a rain bird ec 6.