What does the Viessmann Vitodens 111-W F96 fault code mean?
The F96 fault code on the Viessmann Vitodens 111-W indicates a problem with the domestic hot water (DHW) reset function. This typically means that the boiler is unable to reset the DHW temperature, which can lead to issues with hot water supply.
Common Causes
- Faulty DHW Sensor: A malfunctioning sensor may not accurately detect the water temperature, preventing the reset from occurring.
- Control Board Issue: A fault in the control board can disrupt the communication between components, affecting the DHW reset function.
Can I fix it myself? (DIY)
It is strongly advised to call a Gas Safe Engineer for this issue, as it involves gas and electrical components that require professional handling. Attempting DIY repairs could pose safety risks.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for addressing the F96 fault could range from £150 to £300, depending on whether the DHW sensor or control board needs replacement. This estimate includes parts and labour costs typical for professional repairs.