What does the Viessmann Vitodens 200-W F77 fault code mean?
The F77 fault code on the Viessmann Vitodens 200-W indicates that there are faulty user settings within the boiler’s control system. This can occur due to incorrect adjustments made by the user or a malfunction in the control interface.
Common Causes
- Incorrect Temperature Settings: The user may have set the temperature limits outside of the operational range, causing the boiler to trigger the fault code.
- Control Panel Malfunction: A fault in the control panel or user interface can lead to erroneous settings being registered, resulting in the F77 code.
Can I fix it myself? (DIY)
If you suspect the issue is due to incorrect settings, try resetting the boiler by turning it off and on again. However, for any persistent issues or if you are unsure, it is strongly advised to call a Gas Safe Engineer to ensure safety and compliance with regulations.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for resolving the F77 fault code is around £150 to £250. This includes potential recalibration of the control settings or replacement of the control panel, depending on the specific cause of the fault.