What does the Viessmann Vitodens 050-W E397 fault code mean?
The E397 fault code on the Viessmann Vitodens 050-W indicates a malfunction in the system control board. This issue can prevent the boiler from operating correctly, leading to heating and hot water failures.
Common Causes
- Power Supply Issues: Fluctuations or interruptions in the power supply can affect the control board’s functionality.
- Component Failure: A failure of internal components on the control board itself can lead to this fault code being displayed.
Can I fix it myself? (DIY)
It is recommended to call a qualified Gas Safe Engineer to diagnose and repair this issue, as it involves electrical components and safety risks.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for replacing the control board on a Viessmann Vitodens 050-W is around £400 to £600. This cost reflects the price of the part and the labour involved in the replacement.