What does the Worcester Bosch Greenstar CDi F78 fault code mean?
The F78 fault code indicates a problem with the user feedback system of the Worcester Bosch Greenstar CDi boiler. This typically means that the boiler is unable to communicate properly with the user interface, which can affect its operation.
Common Causes
- Faulty User Interface: The control panel or display may be malfunctioning, leading to incorrect feedback being sent to the boiler.
- Wiring Issues: Damaged or loose wiring connections between the user interface and the boiler can disrupt communication, triggering the fault code.
Can I fix it myself? (DIY)
It is recommended to call a Gas Safe Engineer to diagnose and repair this issue, as it involves electrical components that can be hazardous if handled improperly.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for resolving the F78 fault could be around £150 to £250, primarily due to the potential need for replacing the user interface or repairing wiring, which requires professional expertise.