Hardie Irrigation System Runs Continuously: Valve vs Controller Diagnosis

Hardie System Sprinklers Run Immediately When Water Turned On

A Hardie irrigation system activates all sprinklers immediately when water supply is turned on, running continuously without cycling. The controller appears to have no control over the valves.

Simple Diagnostic Test

1. Turn off controller power (unplug or switch off)
2. Turn on main water supply to irrigation
3. Observe sprinklers:

• Sprinklers run with controller OFF: Valve(s) stuck open mechanically/hydraulically
• Sprinklers stay off with controller OFF: Controller sending constant signal (faulty controller)

If Valves Are Stuck Open

Most common cause: debris in valve seat, torn diaphragm, or solenoid plunger stuck up. Since all zones run, either multiple valves failed simultaneously (unlikely) or there's a master valve issue. Check master valve first if present.

If Controller Is Faulty

Controller outputs constant voltage to valves. Requires controller repair or replacement. Hardie controllers are now manufactured by Irritrol as "Rain Dial" series.

Valve Repair Resources

Step-by-step valve rebuilding guides at irrigationtutorials.com cover diaphragm replacement, solenoid cleaning, and seat inspection for all major brands.