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. 1

    Cycle power on your controller.

  2. 2

    Redownload your program and reinitialize any necessary data.

  3. 3

    Review and implement proper grounding guidelines and use surge suppressors as described in the controller User Manual.

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Verified technical data. Last updated: March 2026

Related Faults

Source: Allen-Bradley MicroLogix 1400 Programmable Controllers