BoilerFaultCodesHalstead 41 Fault Code
The Halstead 41 fault code means: your boiler is struggling to circulate water properly, causing the flame to cut out shortly after it starts to prevent overheating.. It appears on 2 Halstead models in our database.
Technical description: Water flow failure/ Flame for a short period only - Low water pressure / Reversed sensors
DIY fix possible
Check the pressure gauge on the front of the boiler; it should be between 1.0 and 1.5 bar.If the pressure is too low, use the filling loop valves to top the system up with water.Ensure all radiator valves and boiler isolation valves are fully open.
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Halstead models that show the 41 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Halstead 41 fault code information on this page is sourced and cross-checked against the official Halstead service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 31 August 2026