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ErrorLib — Industrial Fault Code Library

Disclaimer: ErrorLib is an independent technical reference tool. While we aim for accuracy, always verify with the manufacturer’s official service manuals before performing maintenance on industrial equipment. ErrorLib is not affiliated with the brands listed.

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.

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 1309)Search more codes in this manual