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Hardie RD-600 No Operation Despite 27VAC: Diagnostic Questions

Display OK, Programs OK, Manual/Station Fail, Battery/Reset Tried

Expert asks critical diagnostic questions:

Tested station voltage output?
Weather sensor present?
Pump/master valve?
Recent yard/basement work?
Harsh environment?
Traced wires? Open circuit?
Power surge?
Water on?
27V reading location?
Tried direct valve wiring to timer?

Irrigation: Hardie 9‑Station Controller Replacement: Irritrol Rain Dial; Hardie Irrigation System Runs Continuously: Valve vs Controller Diagnosis; Hardie RJC-FOUR Controller: Obsolete Model Replacement Options; 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; Hardie Controller Flashes, Won't Run – 15 Years Old, Replace; Hardie Controller Runs Continuously: Valve or Controller Fault?; Hardie RD-600 Display Goes Crazy: Module Cost vs. New Controller; Hardie HR6200 Fuse Holder Replacement: Contact Irritrol (Toro)

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