BoilerFaultCodesViessmann F.379 Fault Code
Also written as F379 — same fault.
The Viessmann F.379 fault code means: your boiler is failing to light the gas or cannot detect that it has successfully stayed lit, resulting in the system shutting down for safety.. It appears on 3 Viessmann models in our database.
Technical description: Flame signal not present or insufficient
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 F.379 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Viessmann F.379 fault code information on this page is sourced and cross-checked against the official Viessmann service / installation manuals for each affected model.
- Viessmann Vitodens 200-W B2HF System manual (PDF)
- Viessmann Vitodens 200-W B2KF Combi manual (PDF)
- Viessmann Vitodens 222-F B2TF manual (PDF)
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026