What does the Worcester Bosch Greenstar i F98 fault code mean?
The F98 fault code on a Worcester Bosch Greenstar i boiler indicates a problem with the communication between the boiler and its system partners, such as the thermostat or other control devices. This can lead to issues with heating and hot water delivery.
Common Causes
- Faulty Thermostat: A malfunctioning thermostat may not communicate properly with the boiler, causing the F98 error.
- Wiring Issues: Damaged or loose wiring connections between the boiler and its control devices can disrupt communication, triggering the fault code.
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 safety risks. Attempting to fix it yourself could lead to further complications.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for resolving the F98 fault code is around £150 to £250, primarily depending on whether a new thermostat or wiring repairs are needed. This cost reflects the complexity of diagnosing and fixing communication issues.