Beko keeps blowing the trip switch?

My beko WM has started blowing the trip switch at the main board. I checked and changed fuses to no avail, and the plug unit is completely sealed and water tight. Dunno what to do, its only about 2 years old. I dont know whether this is related but sometimes my mean lean fat reducing grilling machine will also blow the trip. It is on the same ring/route but i dont use more than 1 appliance at once. Help!