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Thank you for the comments. Is there any way to test for a blockage, or to flush the heat exchanger? Tony

Hi, I get an intermittant, loud and rather alarming noise from my Mynute 28se gas boiler. It powers HW & CH with a mid position divertor valve and integral pump. It starts as a rumble and becomes more of a screech. It lasts three or four seconds and the pressure guage goes up by about half...