What does the Worcester Bosch Greenstar CDi F25 fault code mean?
The F25 fault code on the Worcester Bosch Greenstar CDi indicates a failure to ignite the boiler. This typically means that the boiler is unable to detect a flame during the ignition process, which can prevent it from operating properly.
Common Causes
- Gas Supply Issue: There may be a problem with the gas supply, such as a blockage or shut-off valve being closed.
- Ignition Electrode Fault: The ignition electrode could be dirty or faulty, preventing it from creating a spark 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. However, you can check the gas supply to ensure it is on and not blocked, but do not attempt to fix internal components yourself.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for resolving the F25 fault could be around £150 to £250, depending on whether the issue is a simple gas supply check or requires replacing the ignition electrode.