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Toro Zone 1 Stays On All Cycle—Controller or Diaphragm

Toro system: Zone 1 runs entire cycle duration. Solenoid replaced, wiring checked. No fix.

Isolation Test

Run Zone 2 (or any other)
Measure voltage at controller Zone 1 terminal (red lead) vs COM (black)
If voltage present → controller short → replace controller
If 0V → valve mechanically stuck → rebuild/replace valve

Resource

Valve rebuild guide: irrigationtutorials.com

Irrigation: Rain Bird ESP-8LXi+ Zone 1 Valve Stays Open: Controller or Wiring Fault?; Troubleshooting a Richdel Front Drip Zone That Clicks But Won't Activate; Toro Zone 3 Failure: Controller Voltage Test After Valve and Pump Replacement; Toro Vision II Zone 6 Inactive: Locate Valve and Replace Solenoid; Diagnosing an 18-Year-Old Hardie Controller with SC Error Codes; Zone 1 Valve Won't Run Auto – Valve Backwards or Defective; Zone 2 Works Without Pump, Fails With Pump – Relay Interference; Orbit Valve Flutters and Won't Open Fully; Sprinkler System Stuck on One Zone: Electrical Troubleshooting; Zone 6 Works Manually But Not from Controller: Electrical Fault

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