What does the Viessmann Vitodens 200-W F25 fault code mean?
The F25 fault code on the Viessmann Vitodens 200-W indicates an ignition fault, which means the boiler is unable to ignite the burner. This can prevent the heating system from functioning properly, leading to a lack of hot water or heating.
Common Causes
- Insufficient Gas Supply: If there is a blockage or issue with the gas supply, the boiler may not receive the necessary fuel to ignite.
- Faulty Ignition Electrode: A damaged or dirty ignition electrode can prevent the spark needed to ignite the gas from occurring.
Can I fix it myself? (DIY)
It is recommended to call a Gas Safe Engineer for any gas or electrical issues, as working on these systems can be dangerous. If you suspect a pressure issue, you can check the pressure gauge and reset the boiler if necessary, but always prioritize safety and professional assistance.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for resolving an F25 fault could range from £150 to £300, depending on whether the issue is a simple gas supply blockage or requires replacement of the ignition electrode, which can be more costly.