Have a Hunter Pro C w/ 3 station module. System comes on but will not turn the valves on. Run the system test but no errors come up. Can manually turn valves on and they due work. Have tracked the lines with a line tester and appears there is not a broken wire. When I check current on the box, it shows 12 volts across all the leads when 1 zone is turned on. I have replaced the controller, thinking maybe the transformer was bad, but it is doing the same thing. If I unhook all the zones but 1, it still will not turn the valves on.