Toro Greenskeeper: One Zone Stays On Continuously

On a Toro system, one zone runs even when the controller is off. The homeowner is new to the system.

Immediate Checks

Flow Control: The large knob on the valve should be about halfway open. If fully open, it may prevent closing.
Valve Internals: If flow control adjustment doesn't help, disassemble the valve. Look for debris, a torn diaphragm, or worn seat.

A valve repair guide is available at Irrigation Tutorials. If the valve body is cracked, replace the entire valve.

Irrigation: Toro TMC-212 Hydraulic System: Diagnosing a Stuck-On Zone; Toro Vision II: One Zone Shows 24V Constantly But Won't Water; Winterizing Rain Jet RJC-6 System: Blow-Out Method; Toro 4‑Zone Hydraulic System: Two Stations Don’t Water – Valve Problem; Toro Greenkeeper Zone Stuck On: Valve Failure, Not Controller; Toro Vision 1 System Requires Manual Bleeding of Master Valve; Toro Greenkeeper 212: Zone Won't Shut Off; Toro Zone 4 Runs Constantly: Manual Valve Operation Guide; Toro Extra Timer Cycling Continuously: Troubleshooting Guide; All Six Toro Valves Stuck Open After Winter: Pressure and Sequence Fix

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