Fairford - water pump doesn't stop

Hi
I'm John and we have recently bought a 2016 Fairford. I joined on the recommendation of a friend. We are looking forward to going abroad in a couple of days time in it.
I've done a Puriclean water clean and have flushed the system. I am refilling with water but the water pump won't stop. Is there an easy solution? I have run lots of water through, but think there might still be air in the system 
Thanks in advance.

Welcome to the forum. It does take a time for the system to fill from empty. A few minutes when the pump will be running. . Is there any water running out underneath in which case it will be the boiler dump valve which is activated in the case of freezing temperatures.