Having problems pressurising system

[Apex84]

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.

[Someone-Else]

I am NOT a plumber or heating engineer, but you said when you re pressurise it, it drops to nothing. Can you be more specific as when does it drop? (Within minutes, hours, next day, when the boiler is...........)

Have you looked at your PRV pipe? (It will be the pipe from the boiler that (usually) goes outside, is it wet? (Or gently tie a small plastic bag on it and see if it gets blown off.)

[Apex84]

Hi,


Thanks for the reply

I don't think it is the PRV pipe, as I couldn't see any water on the patio, but I will try the bag trick.

It seems to just drain down in about 30 minutes