My son recently moved house;...the CH boiler is an Ideal Logic Combi ES30 and it’s about 2 or 3 years old. When the system is cold the water pressure shows approx 1.9 bar,...when the CH has been on for a while and everything is fully heated-up the pressure gauge rises to approx 2.9 bar. If the boiler is then turned off the pressure returns to 1.9 bar within 15 mins or so. Is this pressure range normal?...is 2.9 bar too high? The CH and hot-water appears to be functioning perfectly. As ever, all advice gratefully received.