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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.

F804

DIP Switch Error

Mitsubishi Electric · MELSEC Q-series MELSECNET/H

What does F804 mean?

An error related to the DIP switch settings has occurred, indicating a mismatch between the hardware configuration and expected or programmed settings.

Common Causes

  • Incorrect physical position of one or more DIP switches
  • Discrepancy between DIP switch settings and corresponding parameter settings

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Correct the hardware DIP switch settings according to the equipment documentation

  2. 2

    Verify that the parameter settings in the software align with the physical DIP switch positions

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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