Some of the upstairs radiators in my house were always cold so I bled them. This fixed the problem for that day, however, none of the radiators are now working.

When I bled them, I had to keep turning the pressure up as it kept dropping and no air was escaping until I did. The pressure is now sitting around 10 bar.

The boiler is a heatrae sadia megaflow.

What have I done and how can I undo it?

Cheers
Fraser

Fraser, January 2007

you can release out of rad bleed nipple / or rad drain tap. if you call an engineer make sure you tell them its a unvented megaflow system. you don't want anyone tappering with it.

hi-spec plumbing, January 2007

How do I get the pressure down again?

So is there nothing i can do other than calling out an engineer?

Fraser, January 2007

megaflows need a engineer who is trained in unvented systems g3 cert. but i can advise you i wouldn't leave it sitting a 10 bar to long or you'll find more bursts than you planned.your rad valves etc are only designed for max pressure of 10 bar.

hi-spec plumbing, January 2007