Hardie RD-600 Shows "75", Zone 1 Runs Forever – Replace Controller

12-year-old RD-600 shows "75" on display, zone 1 runs continuously, must shut off water at basement.

Verdict

Controller failed. 12 years is good life.

Full reset: unplug, remove battery, wait 10 min, restart.

Buy from irrigation supply: Rain Bird SST, Irritrol Rain Dial. Add rain sensor (wireless/freeze).

Irrigation: Hardie RD-600 Display Frozen After Power Outage: Controller Failure; Hardie Controller Manual Station Error: Replace Panel or Upgrade to Rain Dial; Hardie 446PR Display Garbled: Reset or Replace; Adding Stations to a James Hardie (Irritrol) Controller: Understanding Station Limits; Finding a Replacement for the Hardie RD-600 Irrigation Controller; Programming Hardie Rain Dial for Weekly Watering Schedule; Hardie Controller Runs Continuously: Valve or Controller Fault?; James Hardie Touch Command LX II Lost Stations After Power Outage; James Hardie Controller (c. 1993): MV Terminal & Pump Start Issues; Hardie HR6200 Fuse Holder Replacement: Contact Irritrol (Toro)

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