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I haven't tried it with al the radiators but when I partially drained the system to let the anti sludging agent in I opened and closed both valves on one of the radiators (I have drain points between the radiator and the outlet valve on all my downstairs radiators) and water came out when either...

Hi, My Problem I have no heat downstairs but do have it upstairs and hot water. However, pump still appears to be running as I can hear it switch speeds when I flick the lever on its side (3 speed Grunfoss 15-60) I have been told that one of my downstairs radiators was sludging (kitchen)...