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Hi,when firing up,the boiler will run for a few minutes then cut out(you can hear a humming, but then manually switch out and it goes quiet).We have had a new hot water cylinder fitted a couple of weeks ago, and had a few problems with air etc etc, but the boiler was on constant,however as now...

Hi,Yesterday I had a new hot water cylinder replaced by a plumbing friend.He drained the system etc etc, all is fine apart from when we switched back on,all the radiators worked, apart from 1 downstairs and two upstairs.When I tried to bleed these,only cold water is coming out and no air.Am I...