I have a samsung BQ2Q7G078 built in oven the oven works fine when its on but as soon as i open door it trips the main fuse in the house. ive been told it could be the door lock switch so am looking for any advise on how easy it is to change and where to buy one any help would be much appreciated.
It might be an element fault. All we know at the moment is the unit is tripping your RCD. These devices detect earth faults so you would need to find out which component has the problem