Rain Bird ESP-6TM "Err" Flashing: Shorted Valve Solenoid or Wiring

Error Meaning

"Err" (without number) means one or more valves are shorting the controller. Internal breaker trips to protect the board.

Find the Faulty Zone

1. Set dial to AUTO, press OFF to clear error.
2. Manually start zones one by one from controller.
3. The zone that triggers "Err" immediately is the culprit.

Fix

Replace that zone's solenoid. If error persists with solenoid disconnected, the field wiring has a short (nicked wires, water in splice). Repair or replace wire run.