What does the Baxi Duo-tec F24 fault code mean?
The F24 fault code on a Baxi Duo-tec boiler indicates an overheating issue, which can lead to the boiler shutting down to prevent damage. This fault typically arises when the temperature of the water in the system exceeds safe limits.
Common Causes
- Blocked Heat Exchanger: A build-up of debris or limescale can restrict water flow, causing the boiler to overheat.
- Faulty Thermostat: If the thermostat is malfunctioning, it may not accurately read the water temperature, leading to overheating.
Can I fix it myself? (DIY)
It is recommended to call a Gas Safe Engineer for any issues related to gas or electrical components. However, you can check the pressure gauge and ensure it is within the recommended range; if it’s low, you may need to repressurise the system.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for addressing an F24 fault could range from £150 to £300, depending on whether a new thermostat or heat exchanger cleaning is required. This estimate reflects the cost of parts and labour for a qualified engineer.