0009
Fatal Internal Hardware Error
Allen-Bradley · MicroLogix 1400 Programmable Controllers
What does 0009 mean?
An unexpected and critical hardware error has occurred within the controller itself. This type of fault typically indicates a severe malfunction in the controller's physical components, preventing normal operation.
Common Causes
- Unexpected internal hardware error.
Repair Steps & Checklist
Click steps to track your progress.
- 1
Cycle power on your controller.
- 2
Redownload your program and reinitialize any necessary data.
- 3
Review and implement proper grounding guidelines and use surge suppressors as described in the controller User Manual.
Verified technical data. Last updated: March 2026
Related Faults
Source: Allen-Bradley MicroLogix 1400 Programmable Controllers