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I have a problem, when the heating is turned off I can bleed all the upstairs radiators and the main bleed from the back of the immersion tank. But when the pump is on and the heating is on, if I try and bleed the upstairs radiators I can open them and nothing comes out they don't hiss and no...

I have added new radiators recently and had a leak at the valves, on the return side, I fixed these and bled the system, and due to the location of the new rads increased the pump speed on my Grundfos UPS15-50 from 2 to 3. Thought all was well as all evening good heat all round, heating came...