What does the Glow-worm Flexicom F23 fault code mean?
The F23 fault code on a Glow-worm Flexicom boiler indicates a flame failure, meaning the boiler is unable to detect a flame during operation. This can prevent the boiler from heating water and providing hot water or central heating.
Common Causes
- Blocked Flue: A blockage in the flue can prevent proper ventilation, leading to flame failure.
- Faulty Flame Sensor: If the flame sensor is dirty or malfunctioning, it may not detect the flame, causing the boiler to shut down.
Can I fix it myself? (DIY)
It is recommended to call a Gas Safe Engineer for any gas or electrical issues. However, you can check the boiler pressure and reset the boiler if necessary, following the manufacturer’s instructions.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for addressing the F23 fault could range from £100 to £250, depending on whether a flame sensor replacement or flue cleaning is required. This estimate includes parts and labour costs.