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Thanks, my pump is a myson 2 speed, at the moment it is set on 1 should i turn it up to 2

the last 2 rads on our central heating system have just gone cold the feed is hot but the return is cold the boiler fires up initially and gets quite hot, then altho making a noise it does not appear to be working the rads upstairs are all hot, even one in the same room as the boiler...