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Hi all..............I have an extension where one of the interior walls, which faces north on the outside, is rendered. Since it was completed by the builder a couple of years ago, the interior plaster has been gradually flaking away ( bubbling in parts) and when you rub it the whole area...

It's roughly 15 years old, and recently started to bang loudly - presumably scale build up in heat exchanger as everything else is working AOK. After checking everthing was AOK, an engineer said that he had "tweaked the boiler" by turning the gas pressure down to stop the boiler from...