What does the Viessmann Vitodens 222-F F25 fault code mean?
The F25 fault code on the Viessmann Vitodens 222-F indicates a problem with the ignition process, which prevents the boiler from lighting. This can lead to a lack of heating and hot water, requiring immediate attention.
Common Causes
- Faulty Ignition Electrode: The ignition electrode may be damaged or dirty, preventing it from creating a spark to ignite the gas.
- Gas Supply Issues: There may be a blockage or interruption in the gas supply, which can hinder the ignition process.
Can I fix it myself? (DIY)
It is strongly advised to call a Gas Safe Engineer for any gas or electrical issues, as attempting to fix these problems yourself can be dangerous and is against regulations.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for resolving the F25 fault could range from £150 to £300, depending on whether the ignition electrode needs replacement or if there are gas supply issues that require further investigation.