What does the Viessmann Vitodens 200-W F90 fault code mean?
The F90 fault code on the Viessmann Vitodens 200-W indicates an issue with the user documentation, which may lead to confusion regarding the operation or settings of the boiler. This fault typically suggests that the information provided to the user is either incorrect or insufficient for proper boiler management.
Common Causes
- Incorrect User Manual: The user manual may contain errors or outdated information that does not accurately reflect the boiler’s features.
- Software Glitch: A software issue within the boiler’s control system may cause it to misinterpret user inputs or settings.
Can I fix it myself? (DIY)
It is recommended to consult the official Viessmann documentation or contact a Gas Safe Engineer for assistance, as attempting to resolve documentation issues may not be safe or effective without professional guidance.
Estimated Repair Cost (2026 UK Prices)
Repair costs for addressing the F90 fault code may range from £100 to £200, primarily for professional consultation and potential software updates, as the issue is often related to documentation rather than a physical part failure.