New Rain Bird Controller Installed But Zones Still Don't Run: Field Voltage Test

New controller, 24V at controller terminals, but zones don't run. The voltage must be verified at the valve solenoids—not just the controller.

Critical Test

1. Run a zone manually at controller.
2. At the valve box, measure AC volts across the two solenoid wires.
3. 24V present → Solenoid bad (replace, ~$15).
4. 0V → Wire break or bad splice between controller and valve.

Common Field Faults

• Common wire disconnected at valve manifold
• Nick in zone wire from edging/trenching
• Water-filled wire nut corroded

Controller terminals show voltage because the circuit is open. Under load (solenoid connected), voltage drops if wire is damaged. Test at the valve—it's the truth.