Hello all. I just turned on my water today to my sprinkler system to be met with an odd surprise. As soon as I turn the valve from the back flow assembly to the sprinkler line, one of my zones fires up and I have no way of controlling it other than to turn the valve back off. I can flip my sensor switch on the wall unit to bypass and test the other zones, but I can't get this one zone to shut off. Any ideas? Thanks.