What is the problem when the dw causes the main fuse in the house to trip?

Machine Bosch SMS 603

When switched on to do a wash it trips the main fuse in the house - and will not work when the main switch has been re-set. Other appliances in the kitchen are working fine!

The socket, fuse and plug are OK - they have been checked.

The front panel has been removed and no broken wires were spotted. The only thing that looks odd is that the LED for the on/off indicator looks blown.