How much does it cost to fix Halstead error code Neon L2?

Typical repair cost for the Halstead Neon L2 fault is £120-220 including labour.

Neon L2 High

Halstead Neon L2 Fault Code

Q: What does the Halstead Neon L2 fault code mean?

Your boiler is struggling to correctly read or communicate the temperature of the water, so it has safely paused operation to prevent overheating.

Also written as NEONL2 — same fault.

The Halstead Neon L2 fault code means: your boiler is struggling to correctly read or communicate the temperature of the water, so it has safely paused operation to prevent overheating.. It appears on 1 Halstead model in our database.

Technical description: Demand on / Thermistor check

Typical repair cost £120-220 (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 L2 fault code

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

Hero Repair: £120-220

Source

Halstead Neon L2 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