Neon C illuminated Low

Alpha Neon C illuminated Fault Code

Also written as NEONCILLUMINATED — same fault.

The Alpha Neon C illuminated fault code means: your boiler is operating normally and the burner is currently lit, which is exactly what should be happening when you have the heating or hot water turned on.. It appears on 3 Alpha models in our database.

Monitor it

This is a minor fault. Keep an eye on it and mention it at your next annual boiler service. Reset the boiler and see if it clears.

Technical description: Burner lit

Engineer required

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

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Alpha models that show the Neon C illuminated fault code

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

Source

Alpha Neon C illuminated fault code information on this page is sourced and cross-checked against the official Alpha service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026