First floor zone calls for heat and boiler keeps turning on off

I have a slant fin boiler hot water baseboard the first floor zone calls for heat and the boiler short cycles .
I replaced the thermostat and also replaced the expansion tank which was filled with water. I also bled all three zones and air came out. I also have been having banging pipes. After the bleeding and installing new expansion tank banging stop for a day but then came back. Could the first floor zone valve e bad and be causing this problem.