What does the Worcester Bosch Greenstar Ri F39 fault code mean?
The F39 fault code on the Worcester Bosch Greenstar Ri indicates a problem with the heat exchanger, which may be due to blockages or scaling. This issue can lead to reduced heating efficiency and potential overheating of the boiler.
Common Causes
- Blockage: Debris or sludge accumulation in the heat exchanger can restrict water flow, causing overheating.
- Scaling: Hard water can lead to limescale build-up, which impairs heat transfer and efficiency.
Can I fix it myself? (DIY)
It is recommended to call a Gas Safe Engineer for this issue, as working on the heat exchanger involves gas and electrical components that require professional expertise.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for a faulty heat exchanger on a Worcester Bosch Greenstar Ri is around £600. This includes parts and labour, as heat exchangers can be expensive to replace and require skilled installation.