How much does it cost to fix Ikon error code Neon 4 not lit?

Typical repair cost for the Ikon Neon 4 not lit fault is £120-350 including labour.

Neon 4 not lit High

Ikon Neon 4 not lit Fault Code

Q: What does the Ikon Neon 4 not lit fault code mean?

Your boiler is failing to light the gas flame or cannot detect that it has stayed lit, causing the system to shut down for safety.

Also written as NEON4NOTLIT — same fault.

The Ikon Neon 4 not lit fault code means: your boiler is failing to light the gas flame or cannot detect that it has stayed lit, causing the system to shut down for safety.. It appears on 1 Ikon model in our database.

Technical description: Ignition, pilot or flame proving fault - see detailed fault finding chart.

Typical repair cost £120-350 (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 4 not lit fault code

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

40-50 CI Repair: £120-350

Source

Ikon Neon 4 not lit fault code information on this page is sourced and cross-checked against the official Ikon service / installation manuals for each affected model.

Ikon 40-50 CI manual (PDF)

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