What does the Worcester Bosch Greenstar CDi F59 fault code mean?
The F59 fault code indicates an issue with the condensate pipe, which may be blocked or frozen, preventing proper drainage of condensate from the boiler. This can lead to operational issues and may cause the boiler to shut down to prevent damage.
Common Causes
- Blocked condensate pipe: Debris or sludge can accumulate in the pipe, obstructing the flow of condensate.
- Frozen condensate pipe: In cold weather, the condensate can freeze, particularly if the pipe is not adequately insulated or is exposed to low temperatures.
Can I fix it myself? (DIY)
If you suspect a blockage, you can attempt to clear the condensate pipe by using warm (not boiling) water to thaw any ice or clear debris. However, if you are unsure or if the issue persists, it is strongly advised to call a Gas Safe Engineer for assistance.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for addressing a faulty condensate pipe is around £150. This includes clearing blockages or thawing frozen sections, which typically requires a professional service to ensure safety and compliance with regulations.