What does the Worcester Bosch Greenstar CDi F81 fault code mean?
The F81 fault code on the Worcester Bosch Greenstar CDi indicates a compliance issue, often related to the boiler’s internal safety mechanisms or communication errors. This fault can prevent the boiler from operating correctly, leading to heating and hot water issues.
Common Causes
- Faulty PCB: The printed circuit board may have developed a fault, affecting the boiler’s ability to communicate and function properly.
- Wiring Issues: Damaged or loose wiring connections can lead to compliance errors, interrupting the signals necessary for safe operation.
Can I fix it myself? (DIY)
It is highly recommended to call a Gas Safe Engineer for this issue, as it involves electrical components and safety mechanisms that require professional expertise to diagnose and repair.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for resolving the F81 fault could range around £150 to £300, depending on whether the PCB needs replacement or if wiring repairs are necessary. This cost reflects the complexity of the repairs and the need for professional service.