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I am referring to my central heating system not working correctly if that is what you are referring to when you ask what am i referring to and what is a mv.

Thanks in advance to anybody who assists me. I have a Baxi Solo RS or RS/SS central heating system fitted about 16 years ago i changed the pump about 3 years ago. The radiators upstairs and 3 of 5, of the downstairs radiators were working fine and 2 downstairs were not. After a little...