Excessively noisy burner (1) Emergency

Chaffoteaux Excessively noisy burner (1) Fault Code

Also written as EXCESSIVELYNOISYBURNER1 — same fault.

The Chaffoteaux Excessively noisy burner (1) fault code means: your boiler is burning fuel at an incorrect rate, which is causing the loud noise and indicates the mixture is not balanced correctly for safe operation.. It appears on 2 Chaffoteaux models in our database.

Act immediately

Turn off your boiler and stop using gas appliances. Call a Gas Safe engineer now. This fault can be dangerous if ignored.

Technical description: Over-gassed.
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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Chaffoteaux models that show the Excessively noisy burner (1) fault code

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

Source

Chaffoteaux Excessively noisy burner (1) fault code information on this page is sourced and cross-checked against the official Chaffoteaux service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026