What does the Worcester Bosch Greenstar CDi F90 fault code mean?
The F90 fault code indicates an issue with the product registration of the Worcester Bosch Greenstar CDi boiler. This typically means that the boiler has not been registered correctly with the manufacturer, which can affect warranty and service support.
Common Causes
- Unregistered Product: The boiler may not have been registered with Worcester Bosch during installation.
- Registration System Error: There may be a temporary issue with the manufacturer’s registration system preventing proper validation.
Can I fix it myself? (DIY)
It is recommended to contact a Gas Safe Engineer for assistance with this fault, as it involves product registration with the manufacturer and may require professional intervention.
Estimated Repair Cost (2026 UK Prices)
There is no direct repair cost associated with the F90 fault code, as it typically requires administrative resolution rather than a physical repair. However, if a Gas Safe Engineer is needed for assistance, expect to pay around £100 for their service call.