What does the Vaillant Home F79 fault code mean?
The F79 fault code indicates a system flame detection fault in Vaillant Home boilers. This means that the boiler is unable to detect a flame during operation, which can prevent it from functioning safely and efficiently.
Common Causes
- Faulty Flame Sensor: The flame sensor may be dirty or malfunctioning, preventing it from accurately detecting the flame.
- Gas Supply Issues: Insufficient gas supply or pressure can lead to flame detection problems, causing the boiler to shut down for safety.
Can I fix it myself? (DIY)
It is recommended to call a Gas Safe Engineer for any gas or electrical issues related to this fault. Attempting to fix it yourself could pose safety risks.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for resolving an F79 fault could be around £150 to £250, primarily depending on whether the flame sensor needs cleaning or replacement, as well as any necessary gas supply adjustments.