Neon 2 not lit High

Ikon Neon 2 not lit Fault Code

Also written as NEON2NOTLIT — same fault.

The Ikon Neon 2 not lit fault code means: your boiler has switched itself off because it has gotten too hot, likely due to a circulation issue or a faulty internal sensor.. 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: Overheat cut off device tripped or thermostat, overheat cut off device faulty - see detailed fault finding chart.
Typical repair cost £90-190 (including labour)

DIY fix possible

Check that all radiator valves are fully openEnsure your system pressure is at the correct level (usually 1.0 to 1.5 bar)Allow the boiler to cool down and try pressing the manual reset button

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Ikon models that show the Neon 2 not lit fault code

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

Source

Ikon Neon 2 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