What does the Viessmann Vitodens 100-W F46 fault code mean?
The F46 fault code indicates a faulty control signal within the Viessmann Vitodens 100-W boiler. This typically suggests an issue with the communication between the boiler’s control unit and other components, which can affect the boiler’s operation.
Common Causes
- Wiring Issues: Damaged or loose wiring connections can disrupt the control signals, leading to the F46 fault code.
- Faulty Control Board: A malfunctioning control board may fail to send or receive signals properly, resulting in this error code.
Can I fix it myself? (DIY)
It is advisable to call a Gas Safe Engineer for this issue, as it involves electrical components and safety risks. Attempting to fix it yourself could lead to further damage or safety hazards.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for resolving the F46 fault code is around £250 to £400. This includes potential replacement of the control board or repair of wiring, which can be costly due to the complexity of the components involved.