Rain Dial RD-600 Multi-Function Dial Won’t Advance Clockwise After Power Outage

After a power outage, a Rain Dial RD-600 controller’s multi-function dial won’t turn clockwise (forward) but moves counterclockwise. The dial feels stuck, preventing selection of zone 1. This suggests a power surge damaged the motor-drive mechanism or the dial’s detent/spring.

Troubleshooting Steps

1. Full power reset: Unplug the transformer, remove the 9V backup battery, wait 5 minutes. Reconnect battery, then transformer.
2. Remove the dial: Gently pull the dial off its shaft (some have a setscrew). Check for debris, cracked plastic, or a bent shaft.
3. Clean the shaft and detent with canned air and a soft brush. Do not lubricate.
4. Reinstall the dial and wiggle it gently back and forth to reseat the detent.
5. Test: Power up and try advancing the dial through all positions.

If It Still Sticks

• The internal motor/gear assembly is likely damaged. Repair cost often exceeds a new controller.
• Replace with a modern equivalent: Irritrol Rain Dial-R (direct descendant), Rain Bird ESP-TM2, or Hunter X-Core. All use the same 24 VAC wiring.

Tip: Install a surge protector (e.g., Intermatic IG1240) on the controller’s 120 VAC supply to prevent future surge damage.