What does the Vaillant ecoFIT pure F25 fault code mean?
The F25 fault code on a Vaillant ecoFIT pure boiler indicates a failure to ignite, which can prevent the boiler from starting up and providing heat or hot water. This issue may arise due to various factors, including problems with the gas supply or ignition components.
Common Causes
- Gas Supply Issues: Insufficient gas pressure or a blocked gas supply can prevent ignition.
- Faulty Ignition Electrode: A malfunctioning ignition electrode may fail to create the spark needed to ignite the gas.
Can I fix it myself? (DIY)
It is recommended to call a Gas Safe Engineer for any gas or electrical issues. Attempting to fix ignition problems without proper training can be dangerous.
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 more extensive work.