What does the Worcester Bosch Greenstar Si F84 fault code mean?
The F84 fault code on the Worcester Bosch Greenstar Si indicates a safety issue within the heating system, typically related to the pressure or flow of water. This fault can prevent the boiler from operating safely, requiring immediate attention.
Common Causes
- Low Water Pressure: Insufficient water pressure can trigger the F84 fault, as the system requires a certain level to function correctly.
- Blocked or Faulty Components: Issues such as a blocked heat exchanger or faulty pump can disrupt the flow of water, leading to safety concerns.
Can I fix it myself? (DIY)
It is advisable to check the water pressure and reset the boiler if it is low. However, for any gas or electrical issues, you must call a qualified Gas Safe Engineer to ensure safety and compliance with regulations.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for resolving the F84 fault could range from £150 to £300, depending on whether it involves a simple pressure adjustment or the replacement of faulty components like the pump or heat exchanger.