Hardie Controller Dead Display, Zone 1 Stuck On

A Hardie controller with a dead LCD (even after battery replacement) that only stops watering when unplugged has a failed microprocessor. Zone 1 running continuously without power to the controller confirms a stuck valve—likely the solenoid or diaphragm.

Dual Failure Mode

1. Controller: Dead display + no zone control = replace controller.
2. Zone 1 valve: Runs with controller unplugged = mechanical valve failure.

Immediate Actions

1. Shut off main irrigation water.
2. Replace controller (see options below).
3. While water is off, rebuild zone 1 valve: new diaphragm + solenoid.

Controller Replacements

• Irritrol Rain Dial (6/9/12 zone): Modern equivalent, easy programming.
• Hunter XC / Pro-C: Better features, seasonal adjust.
• Rain Bird ESP-TM2 / ESP-Me: Reliable, good support.

Match zone count. Wiring transfers directly—label all wires first.

Valve Rebuild

Identify valve brand/model (on body). Buy diaphragm + solenoid kit ($15–$25). Clean valve body thoroughly. Reassemble. Test manually before restoring controller power.

Why Both Failed Together

Possible cascade: valve solenoid shorted → sent voltage back into controller output → fried driver chip → controller died → valve stuck energized (if fail-closed) or debris held it open. Replacing both prevents recurrence.