1105

RAM ERROR

Mitsubishi Electric · MELSEC System Q/L Series

What does 1105 mean?

The CPU memory in the CPU module is faulty. This indicates a problem with the main processing unit's internal memory. This error is typically detected at power ON or during a system reset, pointing to a potential hardware malfunction within the CPU module.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Take noise reduction measures.

  2. 2

    Reset the CPU module and RUN it again. If the same error is displayed again, this suggests a CPU module hardware fault.

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Verified technical data. Last updated: March 2026

Related Faults

Source: Mitsubishi Electric MELSEC System Q/L Series