Understanding the 'FUSE' Error on an Irritrol KD6 Controller

KD6 Shows "FUSE" on Zone 5—No User‑Replaceable Fuse Exists

The Irritrol KD6 uses an internal electronic circuit breaker, not a physical fuse. "FUSE 5" means the controller detected a short on zone 5 and skipped it to protect itself.

Troubleshoot Zone 5

1. Locate valve 5 and disconnect both wires from its solenoid.
2. Activate zone 5 from the controller.
3. If "FUSE" still appears, the short is in the field wiring (damaged insulation, crossed wires).
4. If the message clears, the solenoid is shorted—replace it (unscrew old, screw on new, reconnect wires).

Solenoid replacement is straightforward; see irrigationtutorials.com for a walkthrough.