What does the Glow-worm Betacom F42 fault code mean?
The F42 fault code on a Glow-worm Betacom boiler indicates a flue gas temperature fault, which suggests that the boiler is unable to properly monitor or control the temperature of the flue gases. This can lead to inefficient operation and potential safety hazards if not addressed promptly.
Common Causes
- Blocked Flue: A blockage in the flue system can prevent proper ventilation, causing the temperature to rise excessively.
- Faulty Temperature Sensor: A malfunctioning temperature sensor may provide inaccurate readings, leading to the F42 fault code being triggered.
Can I fix it myself? (DIY)
It is highly recommended to call a Gas Safe Engineer for this issue, as it involves gas and electrical components that can be dangerous if handled improperly. Attempting DIY repairs could lead to further complications or safety risks.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for resolving the F42 fault could range from £150 to £300, depending on whether the issue is a simple flue cleaning or requires replacement of the temperature sensor. This estimate includes labour and parts.