What does the Viessmann Vitodens 100-W F72 fault code mean?
The F72 fault code on the Viessmann Vitodens 100-W indicates an issue with the boiler’s date setting, which can affect the overall operation of the unit. This fault typically arises when the internal clock is not set correctly, leading to operational disruptions.
Common Causes
- Incorrect Date/Time Settings: The date or time may have been set incorrectly, either manually or due to a power interruption.
- Faulty Control Board: A malfunction in the control board may prevent the correct date and time from being stored or displayed.
Can I fix it myself? (DIY)
You can attempt to reset the date and time settings through the boiler’s user interface. If the issue persists or if you are unsure, it is strongly advised to contact a qualified Gas Safe Engineer to avoid any safety risks.
Estimated Repair Cost (2026 UK Prices)
The estimated cost for repairing the F72 fault, assuming it requires a replacement control board, would be around £250 to £350. This includes parts and labour, as control board replacements can be expensive and require professional installation.