How much does it cost to fix Halstead error code 41?

Typical repair cost for the Halstead 41 fault is £80-250 including labour.

41 High

Halstead 41 Fault Code

Q: What does the Halstead 41 fault code mean?

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.

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 8 Halstead models in our database.

Technical description: Water flow failure/ Flame for a short period only - Low water pressure / Reversed sensors

Typical repair cost £80-250 (including labour)

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.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026