NEON 4 Low

Halstead NEON 4 Fault Code

Also written as NEON4 — same fault.

The Halstead NEON 4 fault code means: your boiler is operating normally and the main burner is currently lit to provide heat or hot water.. It appears on 1 Halstead model 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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Halstead models that show the NEON 4 fault code

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

Source

Halstead NEON 4 fault code information on this page is sourced and cross-checked against the official Halstead service / installation manuals for each affected model.

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