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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.

F906

Intermediate CPU Error

Mitsubishi Electric · MELSEC Q-series MELSECNET/H

What does F906 mean?

An error has been detected within the intermediate CPU module of the system. This indicates a hardware or firmware issue with this specific CPU.

Common Causes

  • Fault or malfunction within the intermediate CPU

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check the intermediate CPU for any diagnostic indicators, error messages, or signs of malfunction

Browse all codes in this manual (60)
Verified technical data. Last updated: April 2026

Related Faults

F105Initial Status with Baton/Data Link IssueF106Control/Sub-control Station Shift StatusF107Baton Pass Error (Baton Lost)
Source: Mitsubishi Electric MELSEC Q-series MELSECNET/H
Open Manual (Page 162)Search more codes in this manual