0002

Unexpected Reset

Allen-Bradley · MicroLogix 1400 Programmable Controllers

What does 0002 mean?

The controller experienced an unexpected reset, possibly due to electrical noise in the environment or an internal hardware malfunction. Consequently, the default program has been loaded, indicating a loss of the previously loaded user program.

Common Causes

  • Controller reset due to a noisy operating environment.
  • Internal hardware failure within the controller.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

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

  2. 2

    Install surge suppressors according to guidelines in the controller User Manual.

  3. 3

    Verify that the battery is connected to the controller.

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Verified technical data. Last updated: March 2026

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Source: Allen-Bradley MicroLogix 1400 Programmable Controllers