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Hardie RD-600 System Won't Start After Winter: Check Main Water Valve First

RD-600 plugged in, time set, but no sprinklers run. Before troubleshooting electronics, verify the basics.

Checklist

Main irrigation shutoff valve OPEN? (Often left closed after winterization.)
Valves manually operable? Go to valve box, turn bleed screw on each. Heads pop up? Water supply OK.
If manual works but controller doesn't → controller or wiring issue.
If manual fails → main valve closed or supply issue.

Controller Reset

Power off 5 min (remove battery too), restore, reprogram. Fixes winter "glitch" states.

Start at the valve box. 50% of "system dead" calls are just a closed main valve.

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