BoilerFaultCodesViessmann 06 Fault Code
The Viessmann 06 fault code means: your boiler has detected a sequence of ignition or flame detection errors and has shut itself down for safety.. It appears on 9 Viessmann models in our database.
Technical description: Burner control switches to lockout
What causes the Viessmann 06 fault?
This fault occurs when the boiler's internal computer fails to detect a reliable flame during the ignition process. The most common reasons are worn-out sparks that can no longer light the gas, or a dirty sensor that cannot 'see' the flame even after it has started. It can also be caused by a lack of gas reaching the burner due to a faulty valve or a blockage in the air supply.
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 06 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Viessmann 06 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 111-W manual (PDF)
- Viessmann Vitodens 200-W manual (PDF)
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026