What does the Worcester Bosch Greenstar Si F28 fault code mean?
The F28 fault code indicates an ignition failure in the Worcester Bosch Greenstar Si boiler. This typically means that the boiler is unable to ignite the gas supply, preventing it from heating water.
Common Causes
- Gas Supply Issues: There may be a problem with the gas supply, such as a closed valve or a gas leak, preventing the boiler from receiving gas.
- Electrode Problems: The ignition electrode may be dirty or faulty, which can hinder the ignition process.
Can I fix it myself? (DIY)
It is advisable to call a Gas Safe Engineer for any issues related to gas or electrical components. Attempting to fix these problems without proper training can be dangerous.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for resolving an F28 fault could range from £150 to £300, depending on whether the issue is with the gas supply or requires replacement of the ignition electrode.