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The selonoid is located on the zone valve. It will have two wires protruding from it.



The valve will either be located in the ground (hopefully in a valve box) or up against the foundation of the house...depending on your particular layout.

Several things are possibilities, generally when a solenoid goes bad, it does not cause a fuse to blow, it usually stops at that zone and an error message displays. Check to see if zone 3 operates normally with the wire disconnected at the controller, if it does, there is a short, if not it is in the controller. In my experience, I have found that some digging in the yard was done and cut or exposed a wire in the ground. If it is located with other buried wires, near the house meter, the exposed wire can pick up leaking voltage from others in the area. It will be a matter of tracing the wire to the valve. In rare cases though, it can be the solenoid shorted. Good Luck.