There seems to be an. There seems to be an electrical fault in my dishwasher. It is a slimline

Question

There seems to be an electrical fault in my dishwasher. It is a slimline candy dishwasher purchased only three years ago. Everytime I try to start it all the electricity goes in the downstairs of my house. I changed the fuse twice and it worked for a while only for the same thing to happen again. I also tried to turn off all other electical equipment downstairs to see if this made a difference, but it still didn't work. Would you have any idea what is wrong with it? Thanks. S. Byrne