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Powermax 155 system. House is 8 years old. It started last xmas with two cold downstairs rads - rest were hot. Rads removed and flushed and refitted with new valves. No success. Have had the pumps and boiler checked out - all ok. Local Plumbing company put cleaner in two weeks ago and...

Two of my downstairs radiators are cold. The inlet pipes are also cold. wierd thing is that they are at different ends of the house (one living room, other dining room). I have disconnected both radiators and flushed them through. I have also replaced all valves on both, drained the system...