The poblem valve is newer, a Toro 53709. Is it possible the celenoid (sp) is bad? It just screws onto the top of the valve and the wiring is simple.
Moved into a home over the winter with a 6 zone Toro sprinkler system. All works fine except one zone. When I open the valve the heads in that zone acitivate and I can only shut them off by closing the valve. It's not the controller. Is this a valve adjustment problem or is it more? please help.