What does the Baxi Duo-tec F55 fault code mean?
The F55 fault code on a Baxi Duo-tec boiler indicates that the domestic hot water (DHW) flow rate is too high for the system to handle. This can lead to issues with hot water delivery and may require attention to ensure proper functioning.
Common Causes
- Incorrect Flow Rate Settings: The boiler may be set to a flow rate that exceeds its designed capacity, causing the fault code to trigger.
- Faulty Flow Sensor: A malfunctioning flow sensor can incorrectly report the flow rate, leading the boiler to believe it is too high.
Can I fix it myself? (DIY)
It is advisable to call a Gas Safe Engineer to diagnose and resolve this issue, as it may involve adjustments to the boiler settings or replacement of components. Attempting to fix it yourself could pose safety risks.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for addressing the F55 fault could range from £100 to £250, depending on whether the issue is a simple adjustment or requires replacement of the flow sensor, which can be more expensive.