How much does it cost to fix Heatline error code S.41?

Typical repair cost for the Heatline S.41 fault is £80-150 including labour.

S.41 High

Heatline S.41 Fault Code

Q: What does the Heatline S.41 fault code mean?

Your boiler's internal water pressure is currently too high, which prevents it from operating safely to protect the system.

Also written as S41 — same fault.

The Heatline S.41 fault code means: your boiler's internal water pressure is currently too high, which prevents it from operating safely to protect the system.. It appears on 8 Heatline models in our database.

Technical description: High pressure value

Typical repair cost £80-150 (including labour)

DIY fix possible

Locate a radiator in your home with a bleed valvePlace a cloth and container under the valveOpen the bleed valve slowly to release water until the boiler pressure gauge drops to the green zone (usually 1.5 bar)Close the valve tightly

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Heatline models that show the S.41 fault code

Click a model for the full fault code list and model-specific repair notes.

Source

Heatline S.41 fault code information on this page is sourced and cross-checked against the official Heatline service / installation manuals for each affected model.

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