BoilerFaultCodesChaffoteaux 1 04 Fault Code
Also written as 104 — same fault.
The Chaffoteaux 1 04 fault code means: your boiler has detected that water is not flowing through the system correctly, which is preventing it from heating your home safely.. It appears on 1 Chaffoteaux model in our database.
Technical description: Circulation insuffisante
DIY fix possible
Check your central heating pressure gauge to ensure it is between 1 and 1.5 barIf the pressure is low, use the filling loop to top it up to the correct levelEnsure all radiator valves are fully openReset the boiler using the reset button on the control panel
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Chaffoteaux models that show the 1 04 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Chaffoteaux 1 04 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