I also have this machine,mine does the same thing- im told by the engineer that its a design fault(great!) apparently the motor is at the top and there isnt enough room for it to move when the machine is going,therefor it bangs of the side of the casing.Im also told that the latest Hotpoint washer/dryer has the motor located at the bottom where there is more room.
my machine is so noisy at times that my neighbours can here it.i love the way the washing comes out but hate the noise it makes -very dissapointing model.
maureen., July 2010