What does the Worcester Bosch Greenstar CDi F85 fault code mean?
The F85 fault code on the Worcester Bosch Greenstar CDi indicates a fault with the boiler’s internal components, often related to the control system or communication issues. This error typically requires professional diagnosis and repair to ensure safe operation.
Common Causes
- Control Board Failure: A malfunction in the control board can disrupt communication within the boiler, triggering the F85 fault code.
- Wiring Issues: Damaged or loose wiring connections can lead to communication failures between components, resulting in this fault code.
Can I fix it myself? (DIY)
It is strongly advised to call a Gas Safe Engineer for any repairs related to the F85 fault code, as it involves gas and electrical components that require professional expertise.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for resolving the F85 fault code could range from £150 to £300, depending on whether the control board needs replacement or if wiring repairs are necessary. This cost reflects the complexity of the issue and the need for professional service.