We have a Neff B1641 oven.the problem we have is that the oven will heat up.when it gets to a certain temperature it will trip all the electricity in the house
You may well have a defective heating element in the oven. As the element warms up the metal expands very slightly and at a certain point the heating wire inside touches the outer case - a short to earth and an immediate trip from the Earth Leakage safety breaker (RCD).
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix electric cookers.