3 downstairs rads work fine, two upstairs north rads working really well but 2 upstairs south rads not at all, the feed pipe isn't even getting hot, so i changed both radiators for new ones and new thermostatic valves.
before changing rads i tested the valve to see if hot water came through when heating was on and it did on both, (clear hot water). old rads were full of sludge, so thought new rads would solve it. working ok for two or so days then back to cold.
what to do?
before changing rads i tested the valve to see if hot water came through when heating was on and it did on both, (clear hot water). old rads were full of sludge, so thought new rads would solve it. working ok for two or so days then back to cold.
what to do?
