What does the Baxi Duo-tec F80 fault code mean?
The F80 fault code on a Baxi Duo-tec boiler indicates a fault with the central heating user interface. This typically suggests a communication issue between the user interface and the boiler’s control system.
Common Causes
- Loose Connections: Wiring or connectors between the user interface and the main control board may be loose or damaged.
- Faulty User Interface: The user interface itself may be malfunctioning or have internal faults that prevent proper operation.
Can I fix it myself? (DIY)
It is recommended to call a Gas Safe Engineer for this issue, as it involves electrical components that can be hazardous if not handled correctly.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for resolving an F80 fault could be around £150 to £250, primarily due to the potential need for a new user interface or repairs to the wiring, including labour costs.