pressure on boiler to high Baxi 30 HE?

Hi did not shut the pressure loop properly so pressure is on 3 plus.

Got rid of the air bubbles using a hosepipe opening the gate flow and having the loop open.
now the loop is closed and having the gate open draining the water the pressure goes down to 2 but when I shut the gate the pressure rises again I have done this for 3 hours do I continue or try something else.