Irritrol 476PR Shows “1FUS” and Drains 9 V Battery in Days

Controller flashes “1FUS” and the backup battery dies quickly.

“FUS” indicates a short circuit. A bad solenoid on one valve is the most common cause.

If all zones trigger it, the fault is in the controller or common field wiring.

Irrigation: Irritrol KD6-INT Zone 4 Stuck On: Valve Diaphragm or Solenoid Plunger; Richdel 446PR Hybrid: Zone 2 Runs Continuously Even in Off Position; Toro Vision II: One Zone Shows 24V Constantly But Won't Water; Irritrol KwikDial Blinking Display: Reset or Replace Panel; Toro Greenkeeper Zone Stuck On: Valve Failure, Not Controller; Irritrol KD-9 "Fuse" Display: Systematic Solenoid and Wiring Check; Hunter ICC: All Zones Show 26V Simultaneously—No Water Flow; Sprinkler Solenoid Testing After Controller Voltage Confirmed—Ohmmeter Method; Irritrol Controller Error 1: Valve 1 Solenoid or Wiring Fault; Irritrol Total Control: Two Valves Intermittent — Check Diaphragms

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