ok thanks I will look at thatWhat make and model of oven was the old one ?
Most likely the oven element is permanently attached to a circuit board that is powered up when you switch the oven on.
Which incorporates the on/off, temp, and timer functions, rather than a simple switch.
So if the element is starting to fail, it may short out that board and trip your RCD.
well spotted, it is a Spanish set up. Both the cooker and the hob are connected together to the same mcbthis does not look like a UK set-up, all the blacks and blues ( I never knew that is what a RCD was called a CDC/differential circuit breaker) the Double pole MCB's will help find the fault,
are the hob and oven on the same MCB?