Richdel 446PR 50Hz Won't Stop—Controller Failure

446PR 50Hz: one zone keeps running despite all programs OFF. Pause stops it but another starts. Only main water shutoff stops all.

Diagnosis

Controller failed. But first verify: ONLY ONE start time in ONE program. Multiple overlapping starts cause phantom runs.

Water Shutoff

System should have backflow preventer (vacuum breaker or electric valve) with gate valve on mainline before valves. Close that gate valve for irrigation-only shutdown.