What does the Worcester Bosch Greenstar CDi F71 fault code mean?
The F71 fault code indicates a problem with the backup system of the Worcester Bosch Greenstar CDi boiler. This typically suggests that the boiler is unable to operate correctly due to a failure in its secondary heating or control systems.
Common Causes
- Faulty PCB: The printed circuit board may be malfunctioning, leading to incorrect signals being sent to the boiler components.
- Sensor Issues: A defective temperature or pressure sensor can cause the backup system to fail, preventing the boiler from functioning properly.
Can I fix it myself? (DIY)
It is strongly advised to call a Gas Safe Engineer for this issue, as it involves electrical components and gas safety regulations. Attempting to fix it yourself could pose serious safety risks.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for resolving the F71 fault could be around £200 to £300, primarily due to the potential need for a new PCB or sensor replacement, which can be expensive and requires professional installation.