Toro Greenkeeper Zone Stuck On: Valve Failure, Not Controller

If zone runs continuously even with controller fully powered down — the valve is stuck open mechanically.

Causes

Rebuild valve (solenoid + diaphragm). See irrigationtutorials.com.

Controller reset (power + battery disconnect) confirmed it's not the controller.

Irrigation: Toro TCM 212 Losing Time: Microprocessor Failure Means Replacement; Toro ECTRA "Fuse" Flash on Zone 2: Internal Breaker Tripped by Shorted Solenoid or Wire; New Homeowner: Toro Greenkeeper System – What to Do with Valves in the Box?; Irritrol 476PR Shows “1FUS” and Drains 9 V Battery in Days; Richdel 446PR Hybrid: Zone 2 Runs Continuously Even in Off Position; Toro Vision II: One Zone Shows 24V Constantly But Won't Water; Diagnosing Toro EL-6+ Controller Zone Wiring Issues; Toro Greenkeeper 212 Buzzing Module: Power Cycle Without Battery; Toro GreenKeeper 212 Auto Schedule Fails – Reset or Replace; Toro GreenKeeper Controller Trips Breaker on Zone 2 After Sprinkler Changes

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