What does the Viessmann Vitodens 200-W F91 fault code mean?
The F91 fault code on the Viessmann Vitodens 200-W indicates an issue related to user training, suggesting that the user may not be fully aware of how to operate the boiler correctly. This can lead to operational errors that prevent the boiler from functioning as intended.
Common Causes
- Lack of User Knowledge: The user may not have received adequate training or information on how to operate the boiler effectively.
- Misinterpretation of Controls: Users might misinterpret the control panel settings, leading to incorrect operation and triggering the fault code.
Can I fix it myself? (DIY)
It is advisable to consult the user manual for guidance on proper operation and settings. If the issue persists or if you are unsure, please contact a qualified Gas Safe Engineer to avoid any safety risks.
Estimated Repair Cost (2026 UK Prices)
There is no specific repair cost associated with the F91 fault code, as it typically requires user education rather than a physical repair. However, if a Gas Safe Engineer is needed for consultation, expect to pay around £80-£120 for a service visit.