S.95 High

Heatline S.95 Fault Code

Also written as S95 — same fault.

The Heatline S.95 fault code means: your boiler has temporarily stopped working because it has detected a technical issue with its internal voltage or circulation, cutting off both your heating and hot water to protect the system.. It appears on 7 Heatline models in our database.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description: Voltage control, DHW and CH is in blockage
Typical repair cost £100-350 (including labour)

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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Heatline models that show the S.95 fault code

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

Source

Heatline S.95 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 31 August 2026