My central heating system system starts up fine but after about an hour it starts making this really loud roaring noise which seems to be travelling around the system. It stops for a minute or two than will start up again and last for a minute or two before stopping again. I have bled all the radiators. It only seems to happen once the water has heated up for a while and seems worse when it is just on water heating only. Any ideas folks?
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central heating makes roaring noise
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namsag
boiler stat gone and needs changing its allowing water in the system to get too hot
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