DIY Rain Bird ESP-6TM to SST-600i Controller Replacement

Replacing a Rain Bird ESP-6TM with an SST-600i is a manageable DIY task if you label wires meticulously.

Wire-by-Wire Process

1. Turn off 110V breaker to controller.
2. Label every field wire with tape: #1, #2... #6, C (common), MV (if used).
3. Label 110V wires: Black (hot), White (neutral), Green (ground).
4. Disconnect old, mount new, reconnect identically.
5. Restore power, test each zone manually.

After Replacement: Zones Still Don't Run

If new SST-600i shows normal display but no zones activate:

• Test voltage at controller terminals (22–26 VAC per zone when running).
• If no voltage → controller defective (rare on new unit).
• If voltage present → field issue: bad common wire splice, cut wire, or multiple bad solenoids.
• Test one zone at valve: 24VAC at solenoid? If yes, valve/solenoid fault. If no, wire fault.

Most "new controller, same problem" cases reveal a pre-existing field fault the old controller tolerated or masked.