We have just had a cobi boiler fitted, but the up stairs radiators have to be blead all the time because they are cold at the top when the system is turned on.
close all rad valves,then open one at a time little bit first one nearest the boiler then work away from boiler open bit more each rad till the last one is open fully,then bleed rads
me
March 2009
hi look out side where the boiler is fitted you will see a discharge pipe if this is leaking then the pressure will drop ,
it is called a pressure relieve valve,if no leak, the problem must be under the ground floor in the pipe work
chris nort london
March 2009
Once they have been bled that should be it. Does the combi pressure valve drop and needs to be re-pressurised regularly. If so, you definitely have a leak on your sytem somewhere.
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