BoilerFaultCodesHalstead 41 Fault Code
The Halstead 41 fault code means: your boiler is struggling to detect water moving through it, likely because the internal water pressure has dropped too low or a sensor is misreading the situation.. It appears on 5 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 your boiler control panel to see if the pressure gauge is below 1.0 bar.If the pressure is low, locate the filling loop (usually a silver braided hose under the boiler) and open the valves to let water in until the needle reaches 1.5 bar.Once the pressure is in the green zone, close the valves tightly and restart the boiler.
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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.
- Halstead Dimplex Combi manual (PDF)
- Halstead Dimplex System manual (PDF)
- Halstead Eden CBX/SBX manual (PDF)
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026