What does the Vaillant Home F87 fault code mean?
The F87 fault code on a Vaillant Home boiler indicates a system flue gas temperature fault, which suggests that the boiler is detecting an abnormal temperature in the flue gases. This can lead to inefficient operation and potential safety risks if not addressed promptly.
Common Causes
- Blocked Flue: A blockage in the flue system can prevent proper venting of exhaust gases, causing temperature anomalies.
- Faulty Temperature Sensor: A malfunctioning temperature sensor may incorrectly read the flue gas temperature, triggering the fault code.
Can I fix it myself? (DIY)
It is highly recommended to call a Gas Safe Engineer to diagnose and repair this issue, as it involves gas and electrical components that can be dangerous if handled improperly.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for addressing the F87 fault could range from £150 to £300, depending on whether the issue is a simple sensor replacement or requires more extensive work on the flue system.