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I had the system drain down in summer and now I cannot get one of the downstairs radiator works. It is warm but never hot. Seems to me its war up a bit if the boiler/ pump running for several hours. Radiator has been flush with water. RTV is working. In the hot water tank cupboard, after 3 way...

I just had a plumber look at my heating/water system as part annual service. I had a problem with air trapped in HW circuit. In the hot water tank cupboard, between the pump and the 3 way motorized valve, I have a pipe with a large screw on top - acting as an air release valve. The welded head...