Hunter ICC Runs With Controller Unplugged: Failure Analysis

Controller Powers System Despite Being Disconnected

Hunter ICC 14-zone system runs through a program with controller unplugged and battery removed. Only two zones work now. Resetting doesn't restore control.

Diagnosis: Controller Hardware Failure

This is a catastrophic controller failure — likely a shorted output triac or relay that's stuck closed, bypassing the microprocessor entirely. The fact it runs unpowered confirms the output stage is passing line voltage or holding a latched state independently.

Immediate Action

1. Disconnect controller completely (unplug, remove battery, disconnect field wires)
2. Replace controller — repair is not viable for this failure mode
3. Inspect field wiring for damage from the fault condition

Replacement Notes

Hunter ICC is current generation. Direct replacement preserves wiring. Consider ICC2 for enhanced features. Reprogram all zones, verify each operates correctly before leaving site.