Controller Outputs 24V Constantly on One Zone: Workaround or Replace

14-year-old controller: one zone reads 24V constantly (even when off). Working zones read 0V off, 24V on. Can this be saved?

Workaround If Spare Station Exists

If you have a 6-station controller but only 5 zones wired:

1. Move faulty zone's field wire to unused terminal (e.g., #6)
2. Reprogram that zone to new station number
3. Leave faulty terminal disconnected

If All Stations Used

Replace the controller. The output driver (triac/transistor) for that station has failed shorted. Not economically repairable on 14-year-old residential unit.

Replacement Recommendations

• Rain Bird ESP-RZX / ESP-TM2
• Irritrol Rain Dial
• Hunter Pro-HC (if wanting smart features)