Irritrol KD-9 "Fuse" Display: Systematic Solenoid and Wiring Check

Irritrol KD-9 flashes "fuse" with no stations working manually. Need to identify faulty component.

Isolation Procedure

1. Remove battery, power off 1 minute
2. Power on WITHOUT battery
3. Manually activate stations ONE AT A TIME starting at #1
4. When "fuse" appears → that station's circuit has fault

Valve Operation Basics

Controller sends 24VAC → solenoid coil → magnetic plunger lifts → opens valve port → water pressure lifts diaphragm.

Manual Valve Opening

• Unscrew solenoid (catch internal parts!)
• Or open bleed screw on valve body
• Turn water on → valve opens

Fault Sources

• Solenoid shorted (most common)
• Crossed/nicked field wires
• Bad splice connections

Test each solenoid: 20-60 Ohms = good. Replace any out of range.