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ErrorLib — Industrial Fault Code Library

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1104

RAM Error - Address RAM

Mitsubishi Electric · MELSEC System Q/L Series

What does 1104 mean?

The address RAM in the CPU module is faulty. This diagnostic occurs at power ON or after a reset of the CPU module.

Common Causes

  • Faulty address RAM in the CPU module.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Implement noise reduction measures for the control system environment.

  2. 2

    Reset the CPU module and attempt to RUN it again.

  3. 3

    If the same error is displayed again after resetting, diagnose for a CPU module hardware fault.

Browse all codes in this manual (53)
Verified technical data. Last updated: April 2026

Related Faults

1000CPU Down Error1001CPU Down Error with Device Access Issue1002CPU Down Error
Source: Mitsubishi Electric MELSEC System Q/L Series
Open Manual (Page 1308)Search more codes in this manual