What does the Glow-worm Betacom F100 fault code mean?
The F100 fault code indicates an issue with the central heating inlet pressure, which may be too low for the boiler to operate correctly. This can lead to inadequate heating performance and requires immediate attention to ensure safe operation.
Common Causes
- Low Water Pressure: This can occur due to leaks in the system or insufficient water supply, preventing the boiler from functioning properly.
- Faulty Pressure Sensor: A malfunctioning pressure sensor may incorrectly read the inlet pressure, triggering the fault code even if the pressure is adequate.
Can I fix it myself? (DIY)
If you are comfortable, you can check the pressure gauge on the boiler and attempt to repressurise the system by adding water through the filling loop. However, if you suspect a leak or if the problem persists, it is crucial to call a Gas Safe Engineer for further diagnosis and repair.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for addressing the F100 fault could range from £100 to £250, depending on whether the issue is simply a pressure adjustment or requires replacement of components like the pressure sensor.