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I've bled all the rads but found no air, cheers for the advice on 3-port valves I'll go and do some reading. From the other post about cold downstairs rads, the pump still sounds interesting, I'll keep looking. Cheers

I moved into my house in the summer and turned on the heating recently. The 2 downstairs rads next to the gas fire barely warm-up at all. The upstairs rads are hot apart from the bottom couple of inches which are cold. Hot water is fine. Doing my homework, suggests a pump problem. But where do I...