What does the Baxi Duo-tec F48 fault code mean?
The F48 fault code on a Baxi Duo-tec boiler indicates an issue with the air pressure switch, which is responsible for monitoring the airflow within the system. This fault can prevent the boiler from operating safely and efficiently.
Common Causes
- Blocked Flue: A blockage in the flue can restrict airflow, causing the air pressure switch to fail to operate correctly.
- Faulty Air Pressure Switch: The switch itself may be defective or malfunctioning, leading to incorrect readings and triggering the fault code.
Can I fix it myself? (DIY)
While some homeowners may attempt to clear blockages in the flue, it is strongly advised to call a Gas Safe Engineer for any repairs related to the air pressure switch or gas components to ensure safety and compliance with regulations.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for fixing the F48 fault code is around £150-£250, which includes the cost of a new air pressure switch and labour. This price reflects the complexity of diagnosing and replacing the component safely.