How to fix Worcester Bosch Greenstar CDi fault code F65

What does the Worcester Bosch Greenstar CDi F65 fault code mean?

The F65 fault code indicates a faulty installation issue with the Worcester Bosch Greenstar CDi boiler. This may involve incorrect setup or configuration that prevents the boiler from operating efficiently or safely.

Common Causes

  • Incorrect Flue Installation: If the flue is not installed correctly, it can lead to improper ventilation and exhaust issues.
  • Improper Pipework Configuration: Incorrectly sized or routed pipework can cause flow problems, leading to installation faults.

Can I fix it myself? (DIY)

It is highly recommended to call a qualified Gas Safe Engineer to address installation faults, as these issues can involve gas and electrical components that require professional expertise.

Estimated Repair Cost (2026 UK Prices)

The estimated repair cost for resolving an F65 fault could range from £150 to £300, depending on the specific installation issue and any necessary adjustments or replacements required.