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
Implement noise reduction measures for the control system environment.
- 2
Reset the CPU module and attempt to RUN it again.
- 3
If the same error is displayed again after resetting, diagnose for a CPU module hardware fault.
Verified technical data. Last updated: March 2026
Related Faults
Source: Mitsubishi Electric MELSEC System Q/L Series