What does the Glow-worm Ultimate F28 fault code mean?
The F28 fault code on a Glow-worm Ultimate boiler indicates a failure to ignite, which can prevent the boiler from heating water or providing central heating. This issue typically arises from problems with the gas supply or ignition components.
Common Causes
- Gas Supply Issue: There may be a blockage or interruption in the gas supply, preventing the boiler from receiving the necessary fuel to ignite.
- Ignition Electrode Fault: The ignition electrode may be dirty or faulty, failing to create the spark needed to ignite the gas.
Can I fix it myself? (DIY)
It is recommended to call a Gas Safe Engineer for any gas or electrical issues, as working on gas appliances can be dangerous. However, you can check the gas supply to ensure it is on and unobstructed.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for resolving an F28 fault could be around £150 to £250, depending on whether the issue is a simple gas supply blockage or requires replacement of ignition components.