Boiler pressure high

[Mike_SE]

Hello, I joined this forum as it looks like a helpful place. So our boiler is at high pressure all the time, whether the heating is on it not (3bar). Hearing works fine and bleeding the radiators hasn't helped. It also starts to make a loud noise during the night. Never does it in the daytime. If I turn the mains water off, it stops. What could this be? Could someone also identify the flathead screw/valve on the pipes to the left on the picture as well and whether it should be set that way or not?

Thanks in advance

 

[Mike_SE]

The noise at night can be heard upstairs and almost sounds like a breathing/sucking noise, repetitive noise and very annoying!

 

[muggles]

Your photo is too close to see what it's corrected to, but if it's your filling loop then it should be closed. If your filling loop has been left open that will explain the high pressure

 

[Mike_SE]

Thanks for replying. That's what I suspected. I've taken another one and perhaps you could confirm based on this

 

[ianmcd]

yes that is your filling loop , it should be closed , slot at 90 degrees to pipe, only in the position it is in when you have to actually top up the pressure, have to add though, what a very poor installation

 

[Mike_SE]

Thanks for the confirmation. We've only been in the house for a few weeks and only noticed this so I'll close it off and I guess I'll need to bleed the radiators so the system goes to the right pressure?

Can't disagree, I'm expecting it'll need to be changed reasonably soon.

 

[CBW]

It’ll take a lot of bleeding, but yes that’s one way, unless there’s a radiator drain off cock, and do it from there?