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Hydro Rain 100C Works Manual But Not Auto: Check Rain Delay, Reset, Power Cycle

Auto Fails, Manual Works Only with Rain Sensor Off

Ensure program has: station run times, watering days, start time.

Checks

Rain delay not active (press CLEAR).
Press RESET, reprogram from scratch.
Remove battery, power off 1 min, power on, reinstall battery.

If Still Fails

Controller likely needs replacement.

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