How much does it cost to fix Baxi error code Neon 4?

Typical repair cost for the Baxi Neon 4 fault is £120-250 including labour.

Neon 4 High

Baxi Neon 4 Fault Code

Q: What does the Baxi Neon 4 fault code mean?

Your boiler is failing to light the internal flame, which means it cannot produce any heat or hot water and has shut down as a safety precaution.

Also written as NEON4 — same fault.

The Baxi Neon 4 fault code means: your boiler is failing to light the internal flame, which means it cannot produce any heat or hot water and has shut down as a safety precaution.. It appears on 1 Baxi model in our database.

Technical description: Flame Failure

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 4 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 4 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