Rain Bird ESP-LX "Fault 4" Code: Zone Skipped

Decoding "Fault 4" on ESP-LX Controllers

When the display shows symbols or "Fault 4" and the controller skips station 4 in auto but runs it in test, the controller has detected a short circuit on station 4's output and disabled it for protection.

Troubleshooting Steps

1. At the controller, disconnect station 4's field wire.
2. Run a manual cycle on station 4. If "Fault 4" disappears, the short is in the field (wiring or solenoid).
3. If fault persists with wire disconnected, the controller's output triac is shorted—replace controller.
4. In the field: check solenoid resistance (20–60 Ω). A reading near 0 Ω = shorted solenoid.
5. Inspect wire path for damage, water in splices, or wire-to-wire contact.

Clearing the Fault

Once the short is fixed, the controller will automatically re-enable the station on the next cycle. No manual reset needed.

Download the full manual at rainbird.com for all fault code definitions.