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Thanks for quick response. I should probably add that I can hear water running through the pump (don't know if significant) but can't really hear anything else from it. It does seem very hot to the touch though? Discovered header tank practically empty the other week (probably about the same...

Hi I've got a problem with only my upstairs radiators getting hot (the downstairs ones stay cold). However, if I turn off all the radiators upstairs, the downstairs ones work fine? The pump was replaced in Oct last year and I've bled all the radiators in the system? Any help or advice...