What does the Worcester Bosch Greenstar Ri F91 fault code mean?
The F91 fault code indicates a problem with the system enhancements of the Worcester Bosch Greenstar Ri boiler. This typically relates to issues with the boiler’s internal components that manage system efficiency and performance.
Common Causes
- Faulty Sensor: A malfunctioning sensor can disrupt the boiler’s ability to monitor and adjust system enhancements effectively.
- Wiring Issues: Damaged or loose wiring connections can lead to communication failures between components, triggering the F91 fault code.
Can I fix it myself? (DIY)
It is highly recommended to call a Gas Safe Engineer for any repairs related to gas or electrical components. Attempting to fix these issues without proper training can be dangerous.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for resolving the F91 fault code is approximately £150 to £250. This includes diagnostics and potential replacement of faulty sensors or wiring, which are common issues associated with this fault.