I enjoy a baxi 105 and the pump keep running on. any idea`s? ...

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Answers:    do you mean for 15 minutes after the boiler go off

some are supposed to do that to stop the bake exchanger overheating.

Its its permanent, it'll be the controller board.
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The pump will run as long as within is a demand for warmth,and will continue to run for a term after the time control has be switched off.This is call pump overrun,its to protect the heat exchanger.If the pump runs 24/7 consequently,as already stated,the boiler will need a clean pcb.
Do you have a room themostat fitted?