Bleeding Radiators Required Due To High Boiler Pressure?

Postby rootsrat » Thu Oct 17, 2013 7:48 pm

Hi all. First of all - I am a total newbie when it comes to DIY and I have never did much of it, so apologies for any silly questions.

Me and my girlfriend have recently moved into a 2 bed house with CH. We've previously lived in a flat which had electric heating, and so I don't really know anything about CH.

I did some research on web though...

The pressure in our boiler is really high, it oscillates between 2.5 and 3, where 3 is the max the boiler can handle - according to the dial.

Apparently the most common cause of that is air in the CH system. The remedy is to bleed the radiators, which I intend to do as soon as my radiator key arrives (yes, I didn't have one!).

I switched the radiators on tonight to check which ones need bleeding - and the internet teaches us ( icon_wink.gif ) that it's the ones that are not fully heated at the top parts...

Unfortunately mine were cold at the bottom parts (all of them), and I had to switch the heating off as the pressure was getting to 3.5, which was already at the red mark on the pressure dial.

So my question is - what should I do? Do I bleed them all? Will this cause massive pressure drop and a need to re-pressurise the boiler? I need some guidance and advice, as the nights are getting cold and we really need to start heating the house...

Thanks in advance for any kind advice and help!
Rank: Labourer
Progress to next rank:
Posts: 2
Joined: Thu Oct 17, 2013 7:46 pm


Simply Build It

Postby proptech » Fri Oct 18, 2013 10:04 pm

You are quite right, the pressure is too high. I would suspect that there could be a problem with the filling loop, or filling device on the boiler, or even has been left turned on.
I assume this is a gas boiler, so please get a Gas Safe registered engineer out to check it over, and make sure all is safe.
Rank: Foreman
Progress to next rank:
Posts: 415
Joined: Wed Dec 05, 2012 11:22 pm

Postby rootsrat » Sat Oct 19, 2013 10:36 am

Hi there

Thanks for your reply. I have already arranged for an engineer to come over, but I'm not sure if they are Gas Safe registered engineer. I will certainly find out!
Rank: Labourer
Progress to next rank:
Posts: 2
Joined: Thu Oct 17, 2013 7:46 pm

Display posts from previous
Sort by
Order by

  • DIY How to Project Guides

  • DIY how to tutorial projects and guides - Did you know we have a DIY Projects section? Well, if no, then we certainly do! Within this area of our site have literally hundreds of how-to guides and tutorials that cover a huge range of home improvement tasks. Each page also comes with pictures and a video to make completing those jobs even easier!


  • Related Topics