What does the Worcester Bosch Greenstar i F65 fault code mean?
The F65 fault code indicates a problem with the system thermal sensor, which is responsible for monitoring the temperature of the heating system. This fault can lead to overheating or inefficient operation of the boiler.
Common Causes
- Faulty Thermal Sensor: The thermal sensor may be malfunctioning or damaged, leading to incorrect temperature readings.
- Blocked Heat Exchanger: A blockage in the heat exchanger can cause overheating, triggering the fault code.
Can I fix it myself? (DIY)
It is recommended to call a Gas Safe Engineer to diagnose and repair the issue, as it involves gas and electrical components that can be dangerous if handled improperly.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for the F65 fault code is around £150 to £250, primarily due to the potential need for a new thermal sensor and associated labour costs.