In short, when you select "Wash" the machine tries to start filling but trips your house electrics. You unplug the machine, reset the electrics, try again and the same happens.
One would guess you have a badly failed inlet valve or associated wiring, but it could be the control board or just possibly the heater. That's not an exhaustive list but worth looking at.
Someone with a simple multimeter who knows what they are doing could do a lot of checking. They could even eliminate some items by simply disconnecting them and trying the machine but, I stress, that should be someone COMPETENT.