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
Take noise reduction measures.
- 2
Reset the CPU module and RUN it again. If the same error is displayed again, this suggests a CPU module hardware fault.
Verified technical data. Last updated: March 2026
Related Faults
Source: Mitsubishi Electric MELSEC System Q/L Series