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I fixed something like this earlier this fall, buried splice with water resistant connectors outside the building where the wire went from #14 to multistrand to the controller. Just above this splice was a hose bib which a resident told me was leaking. The landscaper replaced the controller in an effort to fix the problem. when I arrived all zones (weathermatic valves) had approx. 70 ohms of resistance, and between any two wires you could complete a circuit.
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