my dishwasher keeps blowing my trip switch?

I have a hotpoint sdw60 aquarius dishwasher it was working all ok then one day i put it on and it tripped my main fuse box i have changed the plug fuse but it still does it,can anyone help me i think i need to change the leakage trip fuse or the fuse inside the machine but dont know how to go about it, if any one has had the same problem could you tell me how you resolved the problem. thank you