What does the Worcester Bosch Greenstar CDi F28 fault code mean?
The F28 fault code indicates that the boiler is unable to ignite due to the absence of a pilot flame. This can prevent the boiler from operating, leading to a lack of heating and hot water.
Common Causes
- Gas Supply Issue: There may be a problem with the gas supply, such as a closed valve or a gas leak, preventing fuel from reaching the boiler.
- Faulty Ignition Electrode: The ignition electrode may be damaged or dirty, which can hinder its ability to create a spark to ignite the gas.
Can I fix it myself? (DIY)
It is recommended to call a Gas Safe Engineer for any gas-related issues. However, you can check the gas supply and ensure that the gas valve is open. If the issue persists, professional assistance is necessary.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for resolving the F28 fault could be around £150 to £250, depending on whether the issue is a simple gas supply check or requires replacing the ignition electrode.