Boiler Fault Code Complaints of noise (6)

Also written as COMPLAINTSOFNOISE6 — same fault.

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

Fault code Complaints of noise (6) appears across 1 boiler brand and 2 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Debris has likely entered your boiler's internal gas supply component, causing it to vibrate or whistle while the system is running. (As reported on Chaffoteaux Flexiflame 140)