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Loud bangs few mins after hot water/heating switched on

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MAS90

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Hi All,


We have a greenstar 15ri boiler, what I believe is a vented cylinder and two tanks in the attic. About 10 minutes or so after the heating or hot water is switched on there are loud bangs/scraping noises coming from pipes next to the cylinder. We believe the culprit is an aerjec2 that runs to the smaller tank in the attic (photo below).

Any ideas on what is causing these noises and if there's anything we can do to fix this ourselves?

Any help or advise would be greatly appreciated as it's driving us nuts!

Thanks
Will

IMG_20181021_110300091.jpg
 
are you rads getting warm?
 

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