What does the Worcester Bosch Greenstar Si F71 fault code mean?
The F71 fault code indicates a calibration issue within the boiler’s control system. This typically means that the boiler is unable to accurately measure or control its internal parameters, which can affect its performance and efficiency.
Common Causes
- Sensor Malfunction: A faulty temperature or pressure sensor can lead to incorrect readings, causing calibration errors.
- Software Glitch: An issue with the boiler’s software or firmware may disrupt the calibration process, requiring a reset or update.
Can I fix it myself? (DIY)
It is recommended to call a Gas Safe Engineer to address this issue, as it involves the boiler’s internal calibration and may require specialized tools and knowledge to resolve safely.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for resolving the F71 fault code is around £150 to £250. This includes diagnostics and potential replacement of faulty sensors or software updates, which are common causes of this fault.