What does the Baxi Duo-tec F90 fault code mean?
The F90 fault code on a Baxi Duo-tec boiler indicates a central heating service fault, typically related to the boiler’s inability to operate correctly due to issues with the heating system or components. This fault may prevent the boiler from providing heating or hot water effectively.
Common Causes
- Blocked or Dirty Filters: A blockage in the system filters can restrict water flow, leading to heating issues.
- Faulty Pump: If the central heating pump is malfunctioning, it may not circulate water properly, causing the boiler to display the F90 fault.
Can I fix it myself? (DIY)
It is advisable to call a Gas Safe Engineer for this fault, as it may involve gas or electrical components that require professional handling. Attempting DIY repairs could pose safety risks.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for resolving an F90 fault could range from £150 to £300, depending on whether the issue is a simple filter clean or requires pump replacement. The costs reflect the need for professional service and potential parts replacement.