Neon 3 not lit High

Ikon Neon 3 not lit Fault Code

Also written as NEON3NOTLIT — same fault.

The Ikon Neon 3 not lit fault code means: your boiler has detected an issue with the ventilation system and has shut down as a safety precaution to ensure exhaust gases are being cleared correctly.. It appears on 1 Ikon model in our database.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description: Air flow proving fault - that is fan or air pressure switch - see detailed fault finding chart.
Typical repair cost £120-280 (including labour)

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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Ikon models that show the Neon 3 not lit fault code

Click a model for the full fault code list and model-specific repair notes.

Source

Ikon Neon 3 not lit fault code information on this page is sourced and cross-checked against the official Ikon service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026