S.07 Low

Vaillant S.07 Fault Code

Also written as S07 — same fault.

The Vaillant S.07 fault code means: your boiler is simply cooling itself down after finishing a heating cycle and does not require any action.. It appears on 28 Vaillant 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: Heating mode: Pump overrun. The pump overrun for heating mode is activated.

What causes the Vaillant S.07 fault?

This status occurs when the boiler has finished heating your home and needs to dissipate the remaining heat from its internal components. The pump continues to circulate water briefly to prevent the heat exchanger from getting too hot while the burner is off. It is a completely normal part of the boiler's operation and ensures the longevity of the system.

This status is naturally more frequent during winter when the heating is cycling on and off to maintain a constant indoor temperature.

DIY fix possible

Wait for 5 to 10 minutesObserve if the code disappears once the pump stops runningCheck that your room thermostat is turned down if you want the heating to stay off

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Vaillant models that show the S.07 fault code

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

Source

Vaillant S.07 fault code information on this page is sourced and cross-checked against the official Vaillant service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026