BoilerFaultCodesChaffoteaux 1 03 Fault Code
Also written as 103 — same fault.
The Chaffoteaux 1 03 fault code means: your boiler is struggling to move water through the system, likely due to low water pressure or a blockage.. It appears on 1 Chaffoteaux model in our database.
Technical description: Circulation insuffisante
DIY fix possible
Check your boiler pressure gauge; if it is below 1 bar, use the filling loop to top it up to 1.5 barEnsure all radiator valves are fully openCheck if your central heating pump is running or if it is stuck and needs a manual restart
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Avoid the next call-out bill
A cover plan would handle faults like 1 03: no call-out fees, no surprise bills.
Affiliate links. We may earn a commission at no extra cost to you.
Chaffoteaux models that show the 1 03 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Chaffoteaux 1 03 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