What does the Worcester Bosch Greenstar Ri F81 fault code mean?
The F81 fault code indicates a problem with the system monitoring, which can affect the boiler’s ability to operate efficiently. This may be due to issues with the control board or sensor malfunctions.
Common Causes
- Control Board Failure: A malfunctioning control board can lead to incorrect readings and trigger the F81 fault code.
- Sensor Issues: Faulty temperature or pressure sensors may not provide accurate data, causing the system to report a monitoring fault.
Can I fix it myself? (DIY)
It is recommended to call a Gas Safe Engineer for this issue, as it involves electrical components and potential gas safety risks. Attempting to fix it without proper training could lead to further complications.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for resolving the F81 fault code is around £200 to £300, primarily due to the potential need for a new control board or sensor replacement, which can be expensive.