What does the Worcester Bosch Greenstar Si F79 fault code mean?
The F79 fault code indicates a problem with the system return, which can affect the boiler’s ability to operate efficiently. This issue may lead to overheating or inadequate heating throughout the system.
Common Causes
- Blocked Return Pipe: A blockage in the return pipe can restrict water flow, causing the boiler to register a fault.
- Faulty Pump: If the circulation pump is malfunctioning, it may not effectively move water through the system, leading to the F79 error.
Can I fix it myself? (DIY)
It is recommended to call a Gas Safe Engineer for this issue, as it involves gas and electrical components that require professional handling. Attempting to fix it yourself could pose safety risks.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for addressing the F79 fault could be around £150 to £250, depending on whether the issue is a blockage or requires pump replacement. This cost reflects the need for professional diagnosis and repair services.