neon flashing (Section I) High

Baxi neon flashing (Section I) Fault Code

Also written as NEONFLASHINGSECTIONI — same fault.

The Baxi neon flashing (Section I) fault code means: your boiler is lighting up but shutting off shortly after because it cannot confirm that the flame is staying on, meaning you currently have no heating or hot water.. It appears on 3 Baxi models 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: Burner extinguishes after 10 seconds - flame sensing fault
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 flashing (Section I) fault code

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

Source

Baxi neon flashing (Section I) 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 7 July 2026