BoilerFaultCodesVaillant Burner lock out indicator Fault Code
Also written as BURNERLOCKOUTINDICATOR — same fault.
The Vaillant Burner lock out indicator fault code means: your boiler has stopped working because it failed to light the flame properly, so it has safely shut itself down to prevent gas from building up.. It appears on 4 Vaillant models in our database.
Technical description: Illuminates when the boiler fails to light after ignition attempts or if the flame supervision device detects no flame
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Vaillant models that show the Burner lock out indicator fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Vaillant Burner lock out indicator fault code information on this page is sourced and cross-checked against the official Vaillant service / installation manuals for each affected model.
- Vaillant Thermocompact manual (PDF)
- Vaillant Turbomax 242/282 1E manual (PDF)
- Vaillant Turbomax VU 282 manual (PDF)
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026