What does the Worcester Bosch Greenstar i F23 fault code mean?
The F23 fault code indicates a flame failure in the Worcester Bosch Greenstar i boiler, meaning the appliance is unable to detect a flame during operation. This can lead to the boiler shutting down to prevent unsafe conditions.
Common Causes
- Blocked Flue: A blockage in the flue can prevent proper ventilation, leading to flame failure.
- Faulty Ignition Electrode: If the ignition electrode is damaged or malfunctioning, it may fail to ignite the gas properly.
Can I fix it myself? (DIY)
It is recommended to call a Gas Safe Engineer for any gas or electrical issues, as working on these components can be dangerous. However, you can check the pressure gauge and ensure it is within the recommended range, and reset the boiler if necessary.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for resolving a flame failure issue could range from £150 to £300, depending on whether the ignition electrode needs replacing or if there are flue blockages that require clearing.