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 motorized valve, I found bypass valve fully opened. Should be this partly closed to stop flow circulate?
thanks Jerry
thanks Jerry