What does the Vaillant ecoTEC exclusive F71 fault code mean?
The F71 fault code indicates a problem with the water quality detected by the boiler. This typically means that the system is experiencing issues related to the presence of impurities or contaminants in the water supply.
Common Causes
- Contaminated Water Supply: Impurities in the water, such as rust or debris, can trigger the F71 fault code.
- Incorrect Water Hardness: Water that is too hard or too soft can affect the boiler’s operation and lead to this fault.
Can I fix it myself? (DIY)
It is recommended to call a Gas Safe Engineer to address this issue, as it may involve testing and treating the water quality, which requires professional expertise.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for addressing the F71 fault code is around £150 to £250. This includes potential water treatment solutions and professional service fees.