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Thanks for the info. If the heat exchanger is scaled up can I buy a product to descale it (inhibitor, cleaner, etc) or would it need replacing? Thanks again for the help

Hi, I have an ariston eurocombi a23 and it has just started making a low whining noise when the hot water or central heating is run. It doesn't do it straight away but after a minute or two and then gradually gets louder. It has also just started (last couple of days) making a low noise for...