Hunter ICC "NO AC" With Good Transformer Voltage: Board Failure

Hunter ICC showing "NO AC" despite 24VAC measured from each yellow transformer wire to ground indicates a controller main board fault—not a power issue.

Why Voltage Test Misleads

Measuring yellow-to-ground shows half the winding. Correct test: across both yellow wires = 24VAC. But you have 24V each to ground, so transformer is fine.

Root Cause

The ICC's AC detection circuit on the main board has failed (common after surges). The board "thinks" power is missing.

Fix

• Replace controller. ICC modular design allows panel swap, but full replacement (~$200) is more reliable.
• Install surge protector on 110V supply (e.g., Intermatic IG1240RC3) to protect new unit.

Don't repair—ICC boards aren't field-serviceable. A new Hunter ICC2 or Rain Bird ESP-LXME is a better investment.