What does the Baxi Duo-tec F41 fault code mean?
The F41 fault code on a Baxi Duo-tec boiler indicates a problem with the domestic hot water (DHW) flow switch. This fault typically means that the flow switch is either stuck, faulty, or not detecting water flow correctly.
Common Causes
- Faulty Flow Switch: The flow switch may be defective and unable to signal the boiler to heat water.
- Blocked Pipework: Debris or limescale buildup in the pipework can prevent proper water flow, leading to the fault code.
Can I fix it myself? (DIY)
It is recommended to call a Gas Safe Engineer to diagnose and repair this issue, as it involves gas and electrical components that can be dangerous if handled improperly.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for fixing the F41 fault could range from £150 to £250, primarily depending on whether the flow switch needs replacing or if additional plumbing work is required to clear blockages.