BoilerFaultCodesViessmann F.357 Fault Code
Also written as F357 — same fault.
The Viessmann F.357 fault code means: your boiler is struggling to get enough gas to stay lit, which means it cannot provide heating or hot water until the supply is restored.. It appears on 4 Viessmann models in our database.
Technical description: Insufficient gas supply
DIY fix possible
Check that your gas meter has credit (if using a pre-payment meter).Ensure the gas emergency control valve (usually located by the meter) is in the 'on' position.Check if other gas appliances, like a hob, are working to confirm a house-wide supply issue.If you have an external gas meter and it is freezing weather, the regulator may be frozen; contact your gas supplier.
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Avoid the next call-out bill
A cover plan would handle faults like F.357: no call-out fees, no surprise bills.
Affiliate links. We may earn a commission at no extra cost to you.
Viessmann models that show the F.357 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Viessmann F.357 fault code information on this page is sourced and cross-checked against the official Viessmann service / installation manuals for each affected model.
- Viessmann Vitodens 100-W WB1A manual (PDF)
- Viessmann Vitodens 200-W B2HF System manual (PDF)
- Viessmann Vitodens 200-W B2KF Combi manual (PDF)
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026