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ErrorLib — Industrial Fault Code Library

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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. 1

    Check the license key file on the SD memory card for integrity and correctness.

Browse all codes in this manual (19)
Verified technical data. Last updated: April 2026

Related Faults

0BD2HSynchronous Encoder Axis Speed Monitor Range Exceeded19EAHCommand Generation Axis Length Per Cycle Invalid1A31HCommand Generation Axis Positioning Address Out of Range
Source: Mitsubishi Electric MELSEC iQ-R Motion Controller
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