Oops, I was wrong about a few things in my earlier post...I was tlking to my son over the phone and I think he misunderstood some of my questions.
As I said, I have a hunter system with a Hunter PRO C control panel. The panel has 12 zones, tho only 10 are being used. (zones 2 and 10 are empty)
When the panel is plugged in, zone one is always on. zones 3 and 4 will not operate from the panel (manually or as part of a program) unless I open the solinoid by hand at the zone. zones 5-9 & 11&12 work fine. When they run, zone one is still on, tho there is obviously a slight drop in the pressure.
Yesterday, I had said that zone one was still on when it was not plugged in, indicating debris in the valve. This is not the case. Zone one turns off when the panel is unplugged, which indicates it isn't the valve, but an electical problem or a panel problem.
This morning I unplugged the panel and switched the zone 1 and zone 3 wires at the panel. the problem reversed itself (the former zone 1 sprinklers turned off and the former zone 3 sprinklers tuned on.) So it seems Zone 1 is always on. As I said, zone 2 on the panel isn't used, so I put the zone 3 wire into the zone 2 termnal, just to see what would happen. The Zone 3 sprinklers came on. So it seems Zones one and two are sending current as long as the panel is plugged in and Zones 3 and 4 are dead.
I removed the panel to reset it and on a whim, plugged in the box that houses the panel and wiring. Zone one came on. So, it doesn't seem to be the panel. Is it the modules? I'm sort of at a loss right now.
This post has been edited 1 times, last edit by "hamiltos777" (Jul 28th 2012, 11:45am)