Irritrol KD6: Front Controller Dead, Back Works Fine

Two KD6 controllers (front/back yard). Back works; front won't activate any zone. Display works, dial functions, but manual start does nothing for any zone.

Quick Checks

1. Rain sensor switch - Must be in BYPASS unless rain sensor installed
2. Common wire - White wire must connect to ALL valves
3. Water supply - Main valve to front zones open?

Factory Reset

Insert small flat screwdriver into reset contacts (usually two small pins/holes on circuit board). Display blinks, controller returns to default program.

If Reset Fails

Test controller output voltage (22-26 VAC at zone terminal vs Common). If no voltage with wires disconnected → controller failed. If voltage present → wiring or valve issue.

Since back controller works on same property, compare settings and wiring between the two units.