boiler pressure rising valliant

Hi All, I recently had an issue where the boiler turned off due to low pressure in the CH circuit. I have since found that the pressure vessel diaphragm had failed so I put in a new one and pressurised the air side to 1 bar. This has not fixed the issue. When the boiler is heating it will go up...

I have a new combi boiler (Vaillant ecoTEC plus 832), 3 months old. It worked perfectly, until bathroom fitters installed a new radiator: The fitter refilled the system after installation of the new radiator and set the pressure at 1.6B. Heating is off, hot water was not run at all, he pressure...

Hi The pressure goes up gradually overall and have to bleed every 3 days or so. It goes up when heating is on and down when not but overall it keeps rising. I disconnected the filling loop. - it's a gas combi about 4 yrs old - I tried to get a non working rad working by bleedin it then turning...