What does the Vaillant ecoTEC pro F31 fault code mean?
The F31 fault code on a Vaillant ecoTEC pro boiler indicates a malfunction with the fan, which is crucial for proper combustion and ventilation. This issue can lead to the boiler shutting down to prevent unsafe operating conditions.
Common Causes
- Blocked Fan: Debris or obstructions may prevent the fan from operating effectively.
- Electrical Fault: Issues with the wiring or connections to the fan can disrupt its functionality.
Can I fix it myself? (DIY)
It is recommended to call a Gas Safe Engineer for this issue, as it involves electrical components and safety risks. Attempting to fix it yourself could lead to further damage or safety hazards.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for fixing the fan on a Vaillant ecoTEC pro boiler is around £200 to £300. This includes parts and labour, as the fan itself typically costs between £100 and £150, with additional charges for professional installation.