F800
Mode Switch Error
Mitsubishi Electric · MELSEC Q-series MELSECNET/H
What does F800 mean?
An error related to the mode switch setting has occurred, likely indicating a hardware configuration mismatch or an invalid mode selection.
Common Causes
- Incorrect physical position of a hardware mode switch
- Invalid parameter setting for the operational mode
Repair Steps & Checklist
Click steps to track your progress.
- 1
Verify the physical position of any mode switches on the hardware
- 2
Check the parameter settings related to the operational mode for correctness
Verified technical data. Last updated: March 2026
Related Faults
Source: Mitsubishi Electric MELSEC Q-series MELSECNET/H