What does the Vaillant ecoFIT pure F35 fault code mean?
The F35 fault code on the Vaillant ecoFIT pure indicates a problem with the ignition electrode, which is responsible for igniting the gas in the boiler. This fault can prevent the boiler from starting or operating correctly, leading to heating and hot water issues.
Common Causes
- Dirty Ignition Electrode: Accumulation of debris or carbon can hinder the electrode’s ability to create a spark.
- Faulty Ignition Electrode: The electrode itself may be damaged or worn out, requiring replacement.
Can I fix it myself? (DIY)
It is recommended to call a Gas Safe Engineer for this issue, as working with gas appliances can be dangerous. Attempting to fix electrical components without proper training can also pose safety risks.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for replacing a faulty ignition electrode on a Vaillant ecoFIT pure is approximately £120. This includes the cost of the part and labour, reflecting the specific nature of the repair required.