BoilerFaultCodesYour boiler is currently running its internal pump to cool down the system after it has finished heating your home or water.
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: Water pump over run
What causes this fault?
This occurs when the boiler has finished its heating cycle and needs to move heat away from the internal heat exchanger to prevent overheating. The system keeps the pump running for a short period to circulate the remaining hot water into the pipes. It is a normal safety function rather than a mechanical failure.
DIY fix possible
No action is usually required as this is a normal operating status.Wait for 5-10 minutes for the 'S' status to clear automatically.Ensure your radiator valves are open to help the heat dissipate.
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Protect yourself from future repair bills
A boiler cover plan would cover faults like S.07 — no call-out fees, no surprises.
Affiliate links — we may earn a commission at no extra cost to you.
Vaillant Thermocompact is discontinued — time for a new one?
Parts for discontinued models can be hard to find and expensive. A new A-rated boiler could save you money on both repairs and energy bills.
Affiliate links — we may earn a commission at no extra cost to you.