What does the Worcester Bosch Greenstar i F85 fault code mean?
The F85 fault code indicates a faulty system feedback issue, which typically means that the boiler is not receiving the correct information from the system regarding its operational status. This can lead to the boiler shutting down to prevent further issues.
Common Causes
- Faulty Sensor: A malfunctioning temperature or pressure sensor can send incorrect data to the boiler, triggering the F85 fault code.
- Wiring Issues: Damaged or loose wiring connections between the boiler and the system can disrupt feedback signals, causing the fault to appear.
Can I fix it myself? (DIY)
It is recommended to call a Gas Safe Engineer for this issue, as it involves electrical components and safety risks. Attempting to fix it without proper training can lead to further damage or safety hazards.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for resolving the F85 fault code is around £150 to £250, primarily due to the potential need for sensor replacement or wiring repairs, which require professional expertise.