Rain Bird ESP-ME Pump Runs Continuously: Controller or Relay Fault

Pump Runs Whenever Controller Has Power, Even in OFF

Unplugging controller display cable stops pump. Lightning storms and surge protector trips preceded issue.

Identify wire on PS (pump start) or MV (master valve) terminal.
Disconnect that wire.
With controller OFF, measure voltage between that terminal (+) and C/common (-). - 22–26 VAC → controller defective (sending constant signal). - 0 VAC → controller OK; relay switch stuck ON.

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