What does the Vaillant ecoTEC pro F24 fault code mean?
The F24 fault code on a Vaillant ecoTEC pro boiler indicates an overheating issue, which can lead to the boiler shutting down to prevent damage. This fault typically arises when the temperature exceeds safe operating 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 temperature, leading to overheating.
Can I fix it myself? (DIY)
While some issues may be resolved by checking the pressure and resetting the boiler, it is strongly advised to call a Gas Safe Engineer for any gas or electrical problems to ensure safety and compliance with regulations.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for addressing the F24 fault could range from £150 to £300, depending on whether the heat exchanger needs cleaning or replacement, as well as the cost of labour.