Your boiler is simply cooling itself down after finishing a heating or hot water cycle and will restart normally once it has finished.

pump / fan overrun

What causes this fault?

This occurs when the boiler has reached its required temperature and needs to shift excess heat away from the internal heat exchanger. The pump and fan continue to run for a short period to prevent the unit from overheating and to protect the internal components. It is a natural part of the boiler's operating cycle and indicates the system is managing its temperature correctly.