0003

Memory Module User Program Corrupt

Allen-Bradley · MicroLogix 1400 Programmable Controllers

What does 0003 mean?

An error occurred with the memory module's internal memory, indicating that the user program stored on it is corrupt. This fault can also manifest when attempting to switch the controller to Run mode. The integrity of the stored program is compromised.

Common Causes

  • Memory module memory error.
  • Corruption of the user program stored on the memory module.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Reprogram the memory module with the correct user program.

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Verified technical data. Last updated: March 2026

Related Faults

Source: Allen-Bradley MicroLogix 1400 Programmable Controllers