What does the Vaillant ecoTEC exclusive F25 fault code mean?
The F25 fault code indicates that the boiler is experiencing a no ignition issue, meaning it is unable to ignite the burner to produce heat. This can lead to a lack of hot water and heating in the property.
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 problem with the gas supply, such as low pressure or a blockage, which can hinder ignition.
Can I fix it myself? (DIY)
It is recommended to call a Gas Safe Engineer for any gas or electrical issues, as attempting to fix these problems without proper training can be dangerous.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for resolving the F25 fault code is around £150 to £250, primarily depending on whether the ignition electrode needs replacement or if there are gas supply issues that require further investigation.