A 6-year-old Toro DDC-6 displays "03" with arrow pointing to "Year" after winter storage with dead 9V battery. Buttons unresponsive even after battery replacement.
A dead battery with power off can corrupt the controller's memory state. The capacitor-backed memory gets "confused" without clean power cycling.
Controller hardware is likely damaged. The DDC-6 is discontinued; replace with modern equivalent (Rain Bird ESP-TM2 or Irritrol Rain Dial). These offer better reliability, easier programming, and current support.
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Hardie Rain Dial 1993: Zones 6 & 7 Run Together—Crossed Wire or Controller
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