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I bought a new pump, but it was a contorsionists job to fit, as the pipe layout was crap. So I thought I'd see if the pump was the issue before I went to stage two :lol: I've shut down the upper rads and the downstairs one's are now hot. Where do I go from here? TIA

Hi, the pump had jammed on my system when I fired it up a couple of months ago. I drained the system and refilled it, then bled the air from the pump and the rads. It heats the upstairs rads instantly but takes ages to get the down stairs even warm. I've turned the pump up to the highest...