Recently had a new pcb board fitted on Halstead Ace boiler. The boiler kept to a constant pressure before this. Since this was fitted the central heating pressure rises up to about 2 bar and would continue to rise if i let it. The pressure rise is very slow over about an 8 hour period when the central heating is on. When I get up in the morning after the heating has been off the guage is only just under 2 bar so i ive been draining water off to drop it back down to about 1bar. i then go through the above process the following day. I just dont want anything to go wrong over the christmas period anyone any ideas what the problem could be thanks