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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.

ER2

Internal ROM Access Error (OS Installation)

Mitsubishi Electric · MELSEC iQ-R Motion Controller

What does ER2 mean?

This error indicates an access failure to the internal ROM of the Motion CPU module during operating system software installation from an SD memory card. This points to a hardware issue with the module's internal memory, preventing the OS from being written.

Common Causes

  • Hardware error in the Motion CPU module's internal ROM preventing OS installation

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Exchange the Motion CPU module.

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

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Source: Mitsubishi Electric MELSEC iQ-R Motion Controller
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