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ErrorLib — Industrial Fault Code Library

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2401H

Module verification error

Mitsubishi Electric · MELSEC iQ-R Series

What does 2401H mean?

The system detected an issue during module verification. This error indicates a discrepancy or problem during the module's verification process. If the "Direct change setting" is enabled, the system might continue operation without stopping, but the error itself will persist.

Common Causes

  • The "CPU Module Operation Setting at Error Detected Module Verify Error" parameter is set to "Stop".
  • A discrepancy occurred during module verification.
  • A module was physically removed or experienced a failure during operation while "Direct change setting" was enabled.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Verify the "Direct change setting" parameter at [Parameter] -> Module model name -> [CPU Parameter] -> "RAS Setting" -> "Online module change setting".

  2. 2

    Check the "CPU Module Operation Setting at Error Detected Module Verify Error" setting.

  3. 3

    If the error remains and affects the system with "Direct change setting" enabled, set it to "Disable" and perform an online module change using special relays and special registers.

Browse all codes in this manual (9)
Verified technical data. Last updated: April 2026

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Source: Mitsubishi Electric MELSEC iQ-R Series
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