NEON 3 High

Halstead NEON 3 Fault Code

Also written as NEON3 — same fault.

The Halstead NEON 3 fault code means: your boiler is struggling because the internal fan is stuck running without the system actually igniting to produce heat.. It appears on 1 Halstead 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: FAN RUNNING
Typical repair cost £150-300 (including labour)

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 3 fault code

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

Source

Halstead NEON 3 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