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
Review the parameter settings for the network number
- 2
Check the hardware switch settings (e.g., DIP switches) that configure the network number
Verified technical data. Last updated: March 2026
Related Faults
Source: Mitsubishi Electric MELSEC Q-series MELSECNET/H