What does the Vaillant ecoTEC plus F25 fault code mean?
The F25 fault code on the Vaillant ecoTEC plus indicates a failure to ignite, which can prevent the boiler from operating properly. This issue typically arises from problems with the ignition system or gas supply.
Common Causes
- Gas Supply Issue: If there is an interruption in the gas supply, the boiler will not ignite.
- Faulty Ignition Electrode: A malfunctioning ignition electrode can fail to create the necessary spark for ignition.
Can I fix it myself? (DIY)
It is recommended to call a Gas Safe Engineer for any issues related to gas or electrical components. 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 could be around £150 to £250, primarily depending on whether the ignition electrode needs replacement or if there are gas supply issues that require further investigation.