BoilerFaultCodesVaillant Ignition indicator Fault Code
Also written as IGNITIONINDICATOR — same fault.
The Vaillant Ignition indicator fault code means: your boiler is attempting to light the flame, but it is not staying lit or detecting the burner, which prevents your heating and hot water from working.. It appears on 3 Vaillant models in our database.
Technical description: The gas valve will open and sparking will commence at the burner. The ignition indicator will illuminate.
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 Ignition indicator fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Vaillant Ignition indicator fault code information on this page is sourced and cross-checked against the official Vaillant service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026