What does the Glow-worm Flexicom F27 fault code mean?
The F27 fault code indicates that the return temperature of the heating system is too high, which can prevent the boiler from operating efficiently. This issue can lead to overheating and potential damage if not addressed promptly.
Common Causes
- Blocked Heat Exchanger: A blockage in the heat exchanger can restrict water flow, causing the return temperature to rise excessively.
- Faulty Temperature Sensors: Malfunctioning temperature sensors may provide inaccurate readings, leading the boiler to misinterpret the return temperature.
Can I fix it myself? (DIY)
It is advisable to call a Gas Safe Engineer to diagnose and repair the issue, as it may involve gas or electrical components that require professional expertise.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for resolving the F27 fault could range from £150 to £300, depending on whether the issue is a blocked heat exchanger or a faulty sensor, with labour and parts included.