What does the Viessmann Vitodens 100-W F96 fault code mean?
The F96 fault code on the Viessmann Vitodens 100-W indicates a problem with the boiler’s energy management system. This typically involves issues with the control unit or sensor malfunctions affecting the boiler’s efficiency and operation.
Common Causes
- Faulty Control Unit: The control unit may be malfunctioning, leading to incorrect energy management signals.
- Sensor Issues: A defective temperature or pressure sensor can disrupt the energy management process, causing the fault code to appear.
Can I fix it myself? (DIY)
It is recommended to call a Gas Safe Engineer for this issue, as it involves complex electronic components and safety risks associated with gas appliances.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for resolving the F96 fault could be around £250 to £400, primarily due to the potential need for replacing the control unit or sensors, which can be expensive components.