What does the Worcester Bosch Greenstar i F99 fault code mean?
The F99 fault code on the Worcester Bosch Greenstar i indicates a problem with the system community, which typically relates to communication issues between the boiler and the heating system. This can prevent the boiler from operating correctly and may require attention to restore functionality.
Common Causes
- Faulty Wiring: Damaged or loose wiring connections can disrupt communication between components.
- Control Board Issues: A malfunctioning control board may fail to process signals correctly, leading to the F99 error.
Can I fix it myself? (DIY)
It is advisable to call a Gas Safe Engineer for this issue, as it involves electrical components and potential safety risks. Attempting to fix it without proper training could lead to further damage or safety hazards.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for resolving the F99 fault could range from £150 to £300, depending on whether wiring repairs or control board replacement is necessary. This estimate reflects the cost of parts and labour for a qualified engineer.