Complaints of noise (2) Low
Boiler Fault Code Complaints of noise (2)
Also written as COMPLAINTSOFNOISE2 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code Complaints of noise (2) 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 Your boiler is making loud noises because trapped air bubbles are causing the water to rattle as it circulates through your heating system. (As reported on Chaffoteaux Flexiflame 140)
Pick your boiler brand for the Complaints of noise (2) fix
Source
Information for the Complaints of noise (2) fault code is sourced from the official service / installation manual for each model that displays it. Read more about how we source fault codes →
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026