What does the Baxi Duo-tec F100 fault code mean?
The F100 fault code on a Baxi Duo-tec boiler indicates an unknown fault within the central heating system. This error suggests that the boiler has detected an issue that it cannot identify, which may require further investigation.
Common Causes
- Faulty PCB: A malfunctioning printed circuit board can lead to communication errors within the boiler.
- Sensor Issues: Problems with temperature or pressure sensors may cause the boiler to misinterpret system conditions.
Can I fix it myself? (DIY)
It is recommended to call a Gas Safe Engineer for this fault, as it may involve complex electrical or gas-related issues that require professional expertise.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for resolving the F100 fault could be around £200 to £300, primarily due to potential replacement of the PCB or sensors, which can be expensive and labour-intensive to install.