What does the Vaillant ecoTEC plus F59 fault code mean?
The F59 fault code on the Vaillant ecoTEC plus indicates a problem with the system air vent, which may be blocked or malfunctioning. This can lead to issues with the boiler’s ability to vent air properly, potentially causing performance problems or overheating.
Common Causes
- Blocked Air Vent: Debris or dirt may obstruct the air vent, preventing proper airflow.
- Faulty Air Vent Mechanism: The internal mechanism of the air vent may be damaged or malfunctioning, leading to incorrect operation.
Can I fix it myself? (DIY)
It is advisable to call a Gas Safe Engineer to address this issue, as working with gas appliances can be dangerous. Attempting to fix the air vent without proper training may lead to further complications.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for fixing the F59 fault is around £150 to £250, depending on whether the air vent needs cleaning or replacement. This cost reflects the need for professional service and potential parts involved.