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A quick follow up... I drained the system down today and took off the valve switching between heat/hot water. The 22mm pipes in and out of this were caked with hardened sludge, so I cut out as much pipe as I could get access to and replaced it. Refilled and voila - heat and hot water...

I have bled everthing, all the rads (these never produce any air) and the pump. When I bleed the pump, water comes out accompanied by a hissing noise. Thinking that this hiss is some air, I've bled it for up to fifteen minutes at a time. Both times I tried this I gave up before the hissing...

The diverter valve (that switches between hot water and heating?) is on compression fittings so I guess it would be possible to crack one of those. I'm not sure if I understand though, on the hot water side there is a vertical pipe with a bleed screw on it (bleeding this hasn't helped me move...

Hi, I've been having problems with heat circulating in my CH since I replaced a radiator in the bathroom about a month ago. System is a vented, pumped system with a quite old Concord WRS boiler (pump on this replaced last year, system also powerflushed at that time). Everything was...