ER3
License Key File Error (SD Card)
Mitsubishi Electric · MELSEC iQ-R Motion Controller
What does ER3 mean?
This error indicates a problem with the license key file present on the SD memory card during the installation mode. The system cannot validate the license for the operating system, halting the installation.
Common Causes
- Corrupted or invalid license key file on the SD memory card
Repair Steps & Checklist
Click steps to track your progress.
- 1
Check the license key file on the SD memory card for integrity and correctness.
Verified technical data. Last updated: March 2026
Related Faults
Source: Mitsubishi Electric MELSEC iQ-R Motion Controller