BoilerFaultCodesChaffoteaux Noises in CH system Fault Code
Also written as NOISESINCHSYSTEM — same fault.
The Chaffoteaux Noises in CH system fault code means: your boiler or radiators are making unusual sounds because there is trapped air in the system or the water pressure has dropped too low.. It appears on 2 Chaffoteaux models in our database.
Technical description: Air presence in C.H. system or Insufficient pressure
DIY fix possible
Check the pressure gauge on the front of the boiler and top it up to 1.5 bar using the filling loop if it is too low.Carefully bleed your radiators using a radiator key to release any trapped air.Restart the boiler to see if the noises persist.
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Chaffoteaux models that show the Noises in CH system fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Chaffoteaux Noises in CH system 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