What does the Vaillant Home F24 fault code mean?
The F24 fault code on a Vaillant Home boiler indicates an overheating issue, which can lead to the boiler shutting down to prevent damage. This fault typically arises from problems with the temperature sensors or circulation issues within the system.
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.
Can I fix it myself? (DIY)
It is advisable to call a Gas Safe Engineer to diagnose and repair the issue, as working on gas appliances can be dangerous. However, you can check the pressure gauge and ensure it is within the normal range (1-1.5 bar) and reset the boiler if necessary.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for fixing an F24 fault could range from £150 to £300, depending on whether the issue is a blocked heat exchanger or a faulty temperature sensor. This cost includes parts and labour for a qualified engineer.