BoilerFaultCodesViessmann 0F Fault Code
The Viessmann 0F fault code means: your boiler is reminding you that its scheduled annual service is now due, but it should continue to provide heating and hot water as normal.. It appears on 8 Viessmann models in our database.
Technical description: Control mode - Maintenance
What causes the Viessmann 0F fault?
This code is triggered by an internal countdown timer within the boiler's control unit, which tracks operating hours or calendar months since the last professional visit. It is not caused by a mechanical failure or a broken part, but rather a pre-set reminder to ensure the appliance remains efficient and safe. Once your Gas Safe engineer completes the maintenance work, they will reset this timer to clear the notification.
This code often appears in autumn as homeowners turn their heating back on, revealing that the twelve-month service interval has passed during the summer months.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Gas Safe Register →Viessmann models that show the 0F fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Viessmann 0F fault code information on this page is sourced and cross-checked against the official Viessmann service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026