Troubleshooting Irritrol KD6 Controller Power Issues and Display Flashes

Irritrol KD6 Powers Down and Shows Random Display Flashes

An Irritrol KD6 KwikDial controller that powers itself off, loses memory, and flashes the display during operation typically indicates a short in the valve circuit. The "FUSE" message (even without a zone number) points to a faulty solenoid or a wiring short, often related to the master valve or backflow preventer.

Diagnostic Steps

1. Test the solenoids: Disconnect each solenoid from the field wires and measure resistance with a multimeter. A healthy solenoid reads 20–60 Ω. Replace any solenoid reading below 20 Ω or above 60 Ω.
2. Check the master valve/backflow wiring: If no zone number appears with the "FUSE" alert, inspect the master valve solenoid and its wiring for damage or corrosion.
3. Reset the controller: Momentarily touch the "Reset" contact with a flat‑blade screwdriver. The display will blink, indicating a return to factory defaults (see manual page 3).

If the problem persists after solenoid replacement and a reset, the controller’s internal circuitry may be damaged and require replacement.