Problem pressurising system

[Apex1984]

Hi there,

I am having issues pressurising my boiler/system. my boiler was below pressure but I had to replace the external filling loop valve (tap had broken on the old one) I did this, and there are no leaks around it. However, every time I pressurise the system back up to 2 bars it drops down to nothing. I also keep bleeding the radiators as they seem to get loads of air in. Am I not running the filling loop for long enough? what am I doing wrong? I can't find any leaks. Any help would be much appreciated.

 

[Deleted member 120897]

If you’re bleeding rads, then the pressure will drop, might be wise to keep it open slightly until you’re nearly complete and then close it off at say 2 bar and bleed the last rad.