What does the Vaillant Home F23 fault code mean?
The F23 fault code on a Vaillant Home boiler indicates a flame failure, meaning the boiler is unable to detect a flame during operation. This can lead to the boiler shutting down to prevent unsafe conditions.
Common Causes
- Blocked Flue: A blockage in the flue can prevent proper ventilation, causing the flame to extinguish.
- Faulty Ignition Electrode: If the ignition electrode is damaged or malfunctioning, it may not ignite the gas properly, leading to flame failure.
Can I fix it myself? (DIY)
It is recommended to call a Gas Safe Engineer for any gas-related issues, including flame failure. Attempting to fix gas appliances without proper training can be dangerous.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for resolving an F23 fault could be around £150 to £250, depending on whether the issue is a simple flue blockage or requires replacement of the ignition electrode.