How much does it cost to fix Baxi error code Neon 5?

Typical repair cost for the Baxi Neon 5 fault is £120-250 including labour.

Neon 5 High

Baxi Neon 5 Fault Code

Q: What does the Baxi Neon 5 fault code mean?

Your boiler has detected that it is overheating and has automatically switched itself off to prevent damage.

Also written as NEON5 — same fault.

The Baxi Neon 5 fault code means: your boiler has detected that it is overheating and has automatically switched itself off to prevent damage.. It appears on 1 Baxi model in our database.

Technical description: Safety Thermostat Activated

Typical repair cost £120-250 (including labour)

Engineer required

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

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Baxi models that show the Neon 5 fault code

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

System 35/60 / 60/100 Repair: £120-250

Source

Baxi Neon 5 fault code information on this page is sourced and cross-checked against the official Baxi service / installation manuals for each affected model.

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