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    Loud humming noise in micro bore central heating system

    Thank you all for your replies. I am not sure about the anti gravity valve, as I do not know what to look for. When I bleed the radiators I do get some black water and it does smell a bit. Also the hall radiator has a cold spot at the bottom, which does not appear to be air, as I belive air...
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    Loud humming noise in micro bore central heating system

    Hello, I have a micro bore central heating system, fed by a Baxi 105e combi boiler, which was fitted 2 years ago. The heating system itself, radiators and pipework is approximatly 15 years of age. I have a loud humming/whining noise from the central heating pipe work. This has happened...
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