What does the Viessmann Vitodens 111-W F97 fault code mean?
The F97 fault code on the Viessmann Vitodens 111-W indicates a problem with the heating circuit update, which may affect the boiler’s ability to maintain the desired temperature. This fault typically arises from communication issues within the heating system or a malfunction in the control unit.
Common Causes
- Communication Error: A disruption in the communication between the boiler and the heating circuit can trigger this fault code.
- Control Unit Malfunction: A failure in the control unit or software may prevent the heating circuit from updating correctly.
Can I fix it myself? (DIY)
It is recommended to call a Gas Safe Engineer for this issue, as it involves complex electrical and gas components that require professional expertise to diagnose and repair safely.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for addressing the F97 fault code could range from £150 to £300, depending on whether the issue is a simple reset or requires replacement of the control unit, which can be costly.