What does the Vaillant ecoTEC plus F24 fault code mean?
The F24 fault code on the Vaillant ecoTEC plus indicates that the boiler is experiencing overheating issues. This can lead to the boiler shutting down to prevent damage, and it typically requires immediate attention to ensure safe operation.
Common Causes
- Blocked Heat Exchanger: A build-up of debris or limescale can restrict water flow, causing the boiler to overheat.
- Faulty Temperature Sensor: If the temperature sensor is malfunctioning, it may incorrectly signal that the boiler is overheating, triggering the F24 fault.
Can I fix it myself? (DIY)
It is recommended to call a Gas Safe Engineer for this issue, as overheating can be dangerous and may involve gas or electrical components that require professional handling.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for addressing the F24 fault could range around £150 to £300, depending on whether the heat exchanger needs cleaning or replacement, or if the temperature sensor requires servicing.