A01

Operating System Software File Error

Mitsubishi Electric · MELSEC iQ-R Motion Controller

What does A01 mean?

This fault indicates an error within the installed operating system software file on the Motion CPU module. The corrupted file prevents the operating system from functioning correctly, leading to operational issues.

Common Causes

  • Corrupted operating system software file installed on the Motion CPU module

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Reinstall the operating system software.

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

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Source: Mitsubishi Electric MELSEC iQ-R Motion Controller
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