What does the Glow-worm Flexicom F75 fault code mean?
The F75 fault code on the Glow-worm Flexicom indicates a failure in the system reset process, often related to issues with the boiler’s internal components or communication errors. This fault can prevent the boiler from operating correctly, leading to heating and hot water supply interruptions.
Common Causes
- Faulty PCB: A malfunctioning printed circuit board can disrupt the reset process and cause the F75 error.
- Low System Pressure: Insufficient water pressure in the heating system can trigger the fault code, as the boiler requires a minimum pressure to function properly.
Can I fix it myself? (DIY)
If you are comfortable with basic maintenance, check the system pressure and ensure it is within the recommended range (typically 1-1.5 bar). If the pressure is low, you can top it up using the filling loop. However, for any electrical or gas-related issues, it is essential to call a qualified Gas Safe Engineer.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for resolving the F75 fault could range from £150 to £300, depending on whether the issue is a simple pressure adjustment or requires a replacement PCB, which can be more expensive due to parts and labour.