BoilerFaultCodesChaffoteaux 1 05 Fault Code
Also written as 105 — same fault.
The Chaffoteaux 1 05 fault code means: your boiler has detected that water is not flowing around your heating system properly, so it has shut down to prevent damage.. It appears on 1 Chaffoteaux model in our database.
Technical description: Circulation insuffisante
DIY fix possible
Check your boiler pressure gauge and top it up to 1.5 bar if it is below 1.0 barEnsure all radiator valves are fully openCheck that your external heating system pump is running and not seized
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Chaffoteaux models that show the 1 05 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Chaffoteaux 1 05 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