What does the Glow-worm Ultimate F29 fault code mean?
The F29 fault code on the Glow-worm Ultimate indicates a flame detection fault, meaning the boiler is unable to detect a flame during operation. This can prevent the boiler from firing up or maintaining operation, leading to heating and hot water issues.
Common Causes
- Faulty Flame Sensor: The flame sensor may be dirty or malfunctioning, preventing it from detecting the flame correctly.
- Gas Supply Issues: Insufficient gas supply or pressure can lead to the flame not being established, triggering the fault code.
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 by pressing the reset button if the pressure is within the normal range.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for resolving an F29 fault could be around £150 to £250, primarily for replacing a faulty flame sensor or addressing gas supply issues, which may require professional intervention.