What does the Worcester Bosch Greenstar i F47 fault code mean?
The F47 fault code indicates a problem with the heat exchanger in the Worcester Bosch Greenstar i boiler. This typically means that the heat exchanger is either blocked, leaking, or has developed a fault that prevents it from functioning properly.
Common Causes
- Blocked Heat Exchanger: Debris or sludge buildup can obstruct the flow of water, leading to overheating and triggering the fault code.
- Leaking Heat Exchanger: A physical crack or corrosion in the heat exchanger can cause water to leak, resulting in a loss of pressure and efficiency.
Can I fix it myself? (DIY)
It is strongly advised to call a Gas Safe Engineer for this issue, as working on the heat exchanger involves gas and electrical components that require professional expertise. Attempting to fix it yourself could be dangerous.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for a faulty heat exchanger on a Worcester Bosch Greenstar i is around £600 to £800. This includes the cost of parts and labour, as heat exchangers can be expensive to replace and require skilled installation.