What does the Vaillant ecoFIT pure F31 fault code mean?
The F31 fault code on the Vaillant ecoFIT pure indicates a malfunction in the printed circuit board (PCB), which is crucial for the boiler’s operation. This issue can lead to the boiler failing to start or operate correctly, affecting heating and hot water supply.
Common Causes
- Electrical Faults: Issues such as short circuits or damaged wiring can cause the PCB to malfunction.
- Component Failure: Components on the PCB may fail due to age, wear, or manufacturing defects, leading to the F31 error.
Can I fix it myself? (DIY)
It is highly recommended to call a qualified Gas Safe Engineer to diagnose and repair the PCB issue, as handling electrical components can be dangerous and may void warranties.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for replacing the PCB in a Vaillant ecoFIT pure is around £300 to £400. This includes the cost of the part and labour, reflecting the complexity of the repair and the need for professional expertise.