How much does it cost to fix Halstead error code Neon L3?

Typical repair cost for the Halstead Neon L3 fault is £150-300 including labour.

Neon L3 High

Halstead Neon L3 Fault Code

Q: What does the Halstead Neon L3 fault code mean?

Your boiler is struggling to clear exhaust fumes because it cannot confirm that the internal fan is moving air properly, preventing it from lighting safely.

Also written as NEONL3 — same fault.

The Halstead Neon L3 fault code means: your boiler is struggling to clear exhaust fumes because it cannot confirm that the internal fan is moving air properly, preventing it from lighting safely.. It appears on 1 Halstead model in our database.

Technical description: Fan operation indicator / Air Pressure Switch check

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 L3 fault code

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

Hero Repair: £150-300

Source

Halstead Neon L3 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