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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.

F803

Group Number Error / Station Number Error

Mitsubishi Electric · MELSEC Q-series MELSECNET/H

What does F803 mean?

A group number or station number error has been detected, typically due to incorrect hardware setting switches or parameter configurations. This prevents proper addressing on the network.

Common Causes

  • Incorrect hardware setting switch (e.g., DIP switch) configuration for group or station number
  • Incorrect group number or station number specified in parameters

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Correct the physical hardware setting switch positions (e.g., DIP switches) related to group or station numbers

  2. 2

    Verify and correct the parameter settings for group or station numbers

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
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