What does the Glow-worm Flexicom F40 fault code mean?
The F40 fault code on the Glow-worm Flexicom indicates a wiring issue within the boiler’s electrical system. This can prevent the boiler from operating correctly, leading to heating and hot water supply problems.
Common Causes
- Loose Connections: Wiring connections may have come loose due to vibration or wear, disrupting the electrical flow.
- Damaged Wiring: Insulation on the wires may be damaged, causing short circuits or open circuits that trigger the fault code.
Can I fix it myself? (DIY)
It is strongly advised to call a Gas Safe Engineer to diagnose and repair the wiring issues, as working with electrical components can be dangerous and may void your warranty.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for resolving the F40 fault could be around £150 to £250, depending on the extent of the wiring issues and whether parts need to be replaced. This includes labour costs for a qualified engineer.