What does the Worcester Bosch Greenstar i F64 fault code mean?
The F64 fault code indicates a problem with the system hydraulic, which can affect the boiler’s ability to operate efficiently. This issue may stem from various hydraulic components within the system that are malfunctioning or blocked.
Common Causes
- Blocked Heat Exchanger: A build-up of debris or limescale can restrict water flow, leading to hydraulic issues.
- Faulty Pump: If the circulation pump is not functioning correctly, it can prevent adequate water movement through the system.
Can I fix it myself? (DIY)
It is advisable to call a Gas Safe Engineer for this issue, as it involves complex hydraulic components that require professional expertise. 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 F64 fault could be around £150 to £300, depending on whether the issue is a blocked heat exchanger or a faulty pump. This cost reflects the price of parts and labour for a qualified engineer.