BoilerFaultCodesViessmann 353 Fault Code
The Viessmann 353 fault code means: your boiler is not receiving enough gas to run at full power, so it has automatically lowered its performance to stay operational.. It appears on 1 Viessmann model in our database.
Technical description: Insufficient gas supply; burner output reduced
DIY fix possible
Check that your gas meter has credit (if using a pre-payment meter).Ensure your external gas emergency control valve is fully open.Check if other gas appliances, like a hob, are working correctly to rule out a wider supply issue.
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Viessmann models that show the 353 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Viessmann 353 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 7 July 2026