What does the Worcester Bosch Greenstar i F25 fault code mean?
The F25 fault code on the Worcester Bosch Greenstar i indicates that there is no water flow detected within the system. This can lead to overheating and potential damage if not addressed promptly.
Common Causes
- Blocked Filter: A blockage in the system filter can restrict water flow, triggering the F25 fault code.
- Low Water Pressure: Insufficient water pressure in the system can prevent proper circulation, leading to the fault code being displayed.
Can I fix it myself? (DIY)
If you are comfortable, you can check the pressure gauge and refill the system if the pressure is low. However, for any gas or electrical issues, it is crucial to call a Gas Safe Engineer to ensure safety and compliance with regulations.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for addressing the F25 fault could be around £150 to £250, primarily depending on whether a filter cleaning or replacement is needed, or if a more complex issue is identified.