What does the Vaillant ecoTEC exclusive F24 fault code mean?
The F24 fault code indicates that the boiler is experiencing overheating issues, which can lead to potential damage if not addressed promptly. This fault typically triggers when the temperature exceeds safe operating limits, prompting the boiler to shut down to prevent further complications.
Common Causes
- Blocked Heat Exchanger: A build-up of debris or limescale can restrict water flow, causing the boiler to overheat.
- Faulty Thermistor: If the thermistor is malfunctioning, it may incorrectly read the temperature, leading to overheating conditions.
Can I fix it myself? (DIY)
It is advisable to call a Gas Safe Engineer to diagnose and repair the issue, especially if it involves gas or electrical components. Attempting to fix these issues without proper training can be dangerous.
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 the thermistor needs replacing. This estimate includes parts and labour costs typical for a qualified engineer.