Hunter ICC: Zones 2–8 Show Voltage But Don't Run—Wiring Fault

Diagnosing a Hunter ICC Controller with Phantom Voltage on Multiple Zones

A Hunter ICC shows 27V on zones 2–8 simultaneously when zone 2 runs. Zones 2–8 don't activate from controller but work manually. Moving zone 2 wire to zone 1 terminal doesn't activate it. Cleaning the board was suggested but didn't help.

Not the Controller: Wiring Issue

The controller outputs voltage correctly (zone 1 works). The fact that moving the wire doesn't activate the valve means the valve or its wiring is faulty.

Focus: Valve Wiring and Common Wire

1. Check all wire connections at the valves—replace with waterproof wire nuts.
2. Verify the common wire (white) is solid at the controller and every valve.
3. Inspect for nicks, cuts, or corrosion in the field wiring.

The simultaneous voltage on zones 2–8 suggests a shorted common or cross-wire in the field. Fix the wiring; the controller is likely fine.