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It is green and square. would i need to replace the whole unit as it appears to be split into two or three units. cheers for all your help as well

Hi I have a Myson Orion boiler which buzzes when in operation, It all works fine but there is a distinct electrical buzzing sound similiar to a transformer at a electricity substation. when it is heating water. when removing the bottom consumer front panel there is a honeywell box with the...