S.30 Low

Heatline S.30 Fault Code

Also written as S30 — same fault.

The Heatline S.30 fault code means: your boiler is currently in standby mode because it is not receiving any instructions from your thermostat or hot water tap to start heating up.. It appears on 8 Heatline models in our database.

Monitor it

This is a minor fault. Keep an eye on it and mention it at your next annual boiler service. Reset the boiler and see if it clears.

Technical description: No request for heating or domestic water.

DIY fix possible

Check your room thermostat is set to a temperature higher than the current room temperature.Ensure your heating timer or programmer is currently in an 'ON' period.Try turning on a hot water tap to see if the boiler ignition sequence begins.

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Heatline models that show the S.30 fault code

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

Source

Heatline S.30 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 7 July 2026