Irritrol KD9 Flashing "FUSE" with All 9 Zone Numbers

The KD9 controller flashes "FUSE" followed by all nine zone numbers (1-9) in auto mode. In manual mode, each zone shows its run time with a battery symbol crossed out.

What "FUSE" + All Zone Numbers Means

This indicates all nine valves have been skipped due to a detected fault on the very first valve. The controller attempts zone 1, detects a short or overload, skips it, then sequentially skips zones 2-9 as well.

Troubleshooting Steps

1. Reset the controller - Power cycle to clear any logic errors
2. Test zone 1 manually - Activate only zone 1 and observe if "FUSE" flashes immediately
3. If zone 1 triggers the fault - The problem is either the zone 1 solenoid or its wiring
4. Check voltage at zone 1 terminals - Should read 22-26 VAC when active

About the Crossed-Out Battery Symbol

This symbol isn't documented in current KD9 manuals. It may indicate a backup battery issue or be a legacy display artifact. Focus on the "FUSE" error first.

Next Steps

If zone 1 is confirmed as the culprit, disconnect its wire at the valve and test the solenoid resistance (should be 20-60 ohms). Replace the solenoid if out of range, or trace the wiring for damage if the solenoid tests good.