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Hardie RD-1200 Controller Not Activating Stations: Voltage and Wiring Test Procedure

12-station Hardie RD-1200 (~11-12 years old) shows programmed but no stations run. Manual button does nothing.

Standard Diagnostic Sequence

Verify water supply on.
Check controller output: 24 VAC at COM and zone terminal when zone activated manually.
If voltage good (24-27 VAC), ohm-test field wiring continuity (solenoid ~30 ohms; 6-8 = short).
Disconnect at valve to isolate solenoid vs. wire short.
Check wire resistance alone (few ohms).

Tony provides the full multimeter procedure for both voltage and resistance testing. This is the universal troubleshooting path for "controller shows on but valves don't open."

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 RD-1200 Battery Drain: Replace Panel, Not Whole Controller; Hardie Controller Manual Station Error: Replace Panel or Upgrade to Rain Dial; Hardie 446PR Display Garbled: Reset or Replace; Hardie Controller Runs Continuously: Valve or Controller Fault?; Hardie RD-1200 Blank LCD: Troubleshooting Power & Display Issues; Hardie HR6200 Fuse Holder Replacement: Contact Irritrol (Toro)

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