What does the Worcester Bosch Greenstar CDi F84 fault code mean?
The F84 fault code indicates a diagnostic fault within the Worcester Bosch Greenstar CDi boiler. This typically suggests that the boiler’s control system has detected an issue that prevents it from operating correctly.
Common Causes
- Faulty PCB: A malfunctioning printed circuit board can disrupt the boiler’s diagnostics and overall functionality.
- Wiring Issues: Damaged or loose wiring connections can lead to communication failures between components, triggering the F84 fault code.
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 risks. Attempting to fix it yourself could lead to further damage or safety hazards.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for resolving the F84 fault code is around £200 to £300, primarily due to the potential need for a new PCB or extensive wiring repairs, which can be labour-intensive.