What does the Glow-worm Betacom F66 fault code mean?
The F66 fault code on the Glow-worm Betacom indicates a problem with the central heating flow temperature, which may prevent the boiler from operating efficiently. This fault typically suggests that the boiler is unable to reach or maintain the required flow temperature for heating.
Common Causes
- Faulty Temperature Sensor: The temperature sensor may be malfunctioning, leading to incorrect readings and triggering the fault code.
- Blocked Heat Exchanger: A blockage in the heat exchanger can restrict water flow, causing the boiler to fail in achieving the desired temperature.
Can I fix it myself? (DIY)
It is advisable to call a Gas Safe Engineer to diagnose and repair this issue, as it may involve gas or electrical components that require professional handling. Attempting DIY repairs could be dangerous.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for resolving the F66 fault could be around £150 to £250, depending on whether the temperature sensor needs replacing or if the heat exchanger requires cleaning. This cost reflects the complexity of the repairs and the need for professional expertise.