What does the Worcester Bosch Greenstar Si F98 fault code mean?
The F98 fault code indicates a problem with the system diagnostics of the Worcester Bosch Greenstar Si boiler. This typically suggests that the boiler’s control system has detected an internal fault that prevents it from operating correctly.
Common Causes
- Faulty PCB: The printed circuit board (PCB) may be malfunctioning, leading to incorrect readings and system failures.
- Wiring Issues: Damaged or loose wiring connections can disrupt communication between components, triggering the fault code.
Can I fix it myself? (DIY)
It is recommended to call a Gas Safe Engineer for this issue, as it involves complex electrical diagnostics and potential safety risks. Attempting DIY repairs could void your warranty or lead to unsafe conditions.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for resolving the F98 fault code is around £200 to £300. This includes potential replacement of the PCB or repair of wiring, which are common issues associated with this fault.