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: March 2026

Related Faults

Source: Mitsubishi Electric MELSEC Q-series MELSECNET/H