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have bleed the radiators and haven't heard any more groaning /rumbling noise.the only thing I hear is when the system starts up is like a dripbut its inconsistent like starts then goes when the system is warmed up .then comes and goes.I hear on and off on some of the other radiators depending...

yes mate probably,we have had the house for a couple of years and its been fine until recently.what should I start to look at/for or do I need a professional.thanks again

hi ,my central heating system seems to make a lot of noise when it starts up followed by the sound of occasional dripping/trickling waterthere isn't a leak as have checked all radiators and after a while no sound at all only when it switches .have found downstairs ones working fine but upstairs...