Zones Come On Together – Short in Controller or Field Wires

Zone 1 (off) runs with zone 2 (10 min). Sometimes other pairs (9+10).

Isolation

1. Disconnect zone 1 wire at controller.
2. Run zone 2. If only zone 2 runs → short in controller terminal strip.
3. If both run → short in field wiring between controller and valves.

Replace controller or repair field wires.