What does the Worcester Bosch Greenstar Si F41 fault code mean?
The F41 fault code on the Worcester Bosch Greenstar Si indicates a problem with the diverter valve, which is responsible for directing hot water to either the heating system or the hot water supply. This fault can prevent the boiler from functioning correctly, leading to issues with heating and hot water availability.
Common Causes
- Faulty Diverter Valve: The diverter valve may be stuck or malfunctioning, preventing it from switching between heating and hot water modes.
- Electrical Issues: There could be a wiring fault or a problem with the control board that affects the diverter valve’s operation.
Can I fix it myself? (DIY)
It is recommended to call a Gas Safe Engineer to address this issue, as it involves gas and electrical components that require professional expertise. Attempting to fix it yourself could pose safety risks.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for the diverter valve replacement is around £250 to £350, which includes parts and labour. This cost reflects the complexity of the repair and the need for a qualified engineer to ensure safety and compliance with regulations.