BoilerFaultCodesChaffoteaux 2a Fault Code
Also written as 2A — same fault.
The Chaffoteaux 2a fault code means: your boiler is making a loud noise because the water pressure inside the system is too low for it to run properly.. It appears on 2 Chaffoteaux models in our database.
Technical description: Boiler noisy - Low pressure in sealed system
DIY fix possible
Locate the filling loop (the flexible silver hose usually underneath the boiler).Slowly open the valve(s) until you hear water entering the system.Watch the pressure gauge and close the valves when it reaches 1.5 bar.
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Chaffoteaux models that show the 2a fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Chaffoteaux 2a 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 31 August 2026