Noises in CH system Medium

Chaffoteaux Noises in CH system Fault Code

Also written as NOISESINCHSYSTEM — same fault.

The Chaffoteaux Noises in CH system fault code means: your heating system is struggling due to trapped air or low water pressure, which is causing the banging or whooshing noises you are hearing.. It appears on 4 Chaffoteaux models in our database.

Book a service

This fault should be looked at by a Gas Safe engineer within the next week or two. It may get worse if left.

Technical description: Air presence in C.H. system or Insufficient pressure
Typical repair cost £80-150 (including labour)

DIY fix possible

Check the pressure gauge on the front of the boiler; if it is below 1 bar, use the filling loop to top it up to 1.5 bar.Turn off the boiler and let the radiators cool down.Use a radiator key to bleed each radiator starting from the ground floor up to the top floor to release trapped air.Re-check and top up the pressure gauge to 1.5 bar again if necessary.

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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 27 April 2026