What does the Baxi Duo-tec F58 fault code mean?
The F58 fault code on a Baxi Duo-tec boiler indicates a central heating pressure fault, typically meaning that the system pressure is either too low or too high. This can lead to inadequate heating performance and may require immediate attention to ensure safe operation.
Common Causes
- Low Water Pressure: This can occur due to leaks in the system or insufficient water in the boiler.
- High Water Pressure: This may be caused by a faulty pressure relief valve or expansion vessel issues.
Can I fix it myself? (DIY)
If the pressure is low, you can attempt to repressurise the system by using the filling loop, following the manufacturer’s instructions. However, if you suspect a more serious issue, such as a leak or a faulty component, it is essential to call a Gas Safe Engineer for assistance.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for addressing a central heating pressure fault could range from £150 to £300, depending on whether it’s a simple repressurisation or if parts like a pressure relief valve need replacing.