Irrigation System Runs with Controller Off: Mainline Break or Stuck Valves

Controller off but water runs to system; heads don't pop up. Water shutoff at main stops it.

Two Possibilities

Mainline Break: Pipe from main shutoff to valves is cracked. Look for wet spot; small leaks may take time to surface.
Stuck Automatic Valves: One or more valves stuck open. Water should appear at their heads. Valves can usually be rebuilt.

Locate valves with a wire/valve locator (rent from irrigation supply). Then inspect each valve.

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