What does the Glow-worm Betacom F79 fault code mean?
The F79 fault code indicates a domestic hot water (DHW) outlet pressure fault in the Glow-worm Betacom boiler. This typically means that the pressure of the water being delivered for heating is not within the acceptable range, which can affect the boiler’s performance.
Common Causes
- Low Water Pressure: Insufficient water pressure in the system can lead to this fault, often caused by leaks or insufficient filling of the system.
- Blocked DHW Heat Exchanger: A blockage in the heat exchanger can restrict water flow, resulting in pressure issues and triggering the fault code.
Can I fix it myself? (DIY)
If you are experienced with boiler maintenance, you can check the system pressure and attempt to refill it if it’s low. However, for any gas or electrical issues, it is strictly advised to call a Gas Safe Engineer to ensure safety and compliance with regulations.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for addressing the F79 fault could be around £150 to £250, primarily depending on whether the issue is a simple pressure refill or requires cleaning/replacing the heat exchanger, which can be more labour-intensive.