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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.

F801

Network Number Error

Mitsubishi Electric · MELSEC Q-series MELSECNET/H

What does F801 mean?

A network number error has been detected, indicating a mismatch or incorrect configuration of the network number for the device.

Common Causes

  • Incorrect network number configured in parameters
  • Incorrect network number set via hardware switches (e.g., DIP switches)

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Review the parameter settings for the network number

  2. 2

    Check the hardware switch settings (e.g., DIP switches) that configure the network number

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