BoilerFaultCodesViessmann 357 Fault Code
The Viessmann 357 fault code means: your boiler is not receiving enough gas to light properly, which means it cannot provide heating or hot water.. It appears on 1 Viessmann model in our database.
Technical description: Insufficient gas supply
DIY fix possible
Check if other gas appliances, like a hob, are working to confirm your gas supply is active.If you have a pre-payment meter, ensure it has sufficient credit.Check that the gas emergency control valve (usually located near the meter) is in the fully open position.Reset the boiler by following the instructions on the display panel.
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Viessmann models that show the 357 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Viessmann 357 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