What does the Worcester Bosch Greenstar i F74 fault code mean?
The F74 fault code on the Worcester Bosch Greenstar i indicates a problem with the system operation, often related to a fault in the boiler’s internal components or sensors. This can lead to the boiler shutting down or failing to operate efficiently.
Common Causes
- Faulty Sensor: A malfunctioning temperature or pressure sensor can cause incorrect readings, leading to system operation issues.
- Electrical Fault: Issues with the boiler’s wiring or control board can disrupt communication between components, resulting in the F74 error.
Can I fix it myself? (DIY)
It is 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 F74 fault could range from £150 to £300, depending on whether a sensor replacement or electrical repair is needed. This cost reflects the complexity of diagnosing and fixing internal boiler issues.