Ok so I just bought a house and only 2 of 7 zones work. When I go to the backyard green valve box, I can only manually turn on 1 of the 4 valves, the other three wont supply water to the sprinkler heads but I hear water flowing and water is comming out of the valve when i go to turn it on. Im thinking that I have a bad valve or a bad silenoid, am I on the right track?
