What does the Worcester Bosch Greenstar CDi F86 fault code mean?
The F86 fault code on the Worcester Bosch Greenstar CDi indicates a communication fault between the boiler and the user interface. This typically suggests an issue with the control board or the wiring connecting the two components.
Common Causes
- Faulty Control Board: A malfunctioning control board can disrupt communication, leading to the F86 error.
- Wiring Issues: Damaged or loose wiring between the boiler and the user interface can also cause this fault code to appear.
Can I fix it myself? (DIY)
It is recommended to call a Gas Safe Engineer for this issue, as it involves electrical components and potential safety hazards. Attempting to fix it yourself may void the warranty or lead to further complications.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for resolving the F86 fault code is around £150 to £250. This includes diagnostics and potential replacement of the control board or wiring, which can be costly due to the complexity of the components involved.