BoilerFaultCodesViessmann F0 Fault Code
The Viessmann F0 fault code means: your boiler has experienced a serious internal brain failure and the main control board likely needs to be replaced.. It appears on 8 Viessmann models in our database.
Technical description: Burner in fault position. Internal fault. Replace the control unit.
What causes the Viessmann F0 fault?
This fault occurs when the boiler's central processor can no longer communicate with the internal components or fails its own start-up safety checks. It is usually caused by an electrical component failure on the main circuit board or a surge that has damaged the delicate microchips that control the heating process.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Viessmann models that show the F0 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Viessmann F0 fault code information on this page is sourced and cross-checked against the official Viessmann service / installation manuals for each affected model.
- Viessmann Vitodens 050-W BPJD manual (PDF)
- Viessmann Vitodens 100-W manual (PDF)
- Viessmann Vitodens 100-W WB1B manual (PDF)
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026