BoilerFaultCodesViessmann 30:0 Fault Code
Also written as 300 — same fault.
The Viessmann 30:0 fault code means: your boiler has detected an issue with the water pump that moves heat around your radiators and taps, meaning it cannot circulate heat effectively.. It appears on 3 Viessmann models in our database.
Technical description: Internal non-variable speed circulation pump (automatic adjustment)
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 30:0 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Viessmann 30:0 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 manual (PDF)
- Viessmann Vitodens 200-W manual (PDF)
- Viessmann Vitodens 222-F manual (PDF)
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026