Your boiler is currently running its internal water circulation pump longer than expected after finishing a heating or hot water cycle, but this is usually just a system status notification rather than a breakdown.

pump run on after CH or DHW is satisfied

What causes this fault?

This fault occurs when the boiler's internal sensor detects a flame still burning after the heating cycle has finished or before it has even started. The most common reason is a sticking gas valve that isn't closing properly, or a faulty sensor providing a false signal to the control board.