Nelson SmartZone EZ: Zone 2 Won’t Shut Off – Pump Relay or Controller Fault

Zone 2 runs continuously; only power disconnect stops it. Controller off but pump runs.

Diagnosis

1. Disconnect controller power. If pump stops → controller faulty. If pump keeps running → pump‑start relay stuck.
2. If pump stops but zone 2 still runs → valve stuck open (rebuild/replace valve).