What does the Worcester Bosch Greenstar CDi F88 fault code mean?
The F88 fault code on the Worcester Bosch Greenstar CDi indicates a communication issue between the boiler’s control board and the technical support system. This may result in the boiler being unable to operate correctly and requires attention to restore functionality.
Common Causes
- Faulty Control Board: A malfunctioning control board can disrupt communication with the technical support system, leading to the F88 error.
- Wiring Issues: Damaged or loose wiring connections can prevent proper signals from being transmitted, causing the 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 risks. Attempting to fix it yourself could lead to further complications or safety hazards.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for resolving the F88 fault code is around £250 to £400, 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 expertise.