We had this problem some time ago with our previous oven but it didn't happen all the time..we have recently installed a new oven and it worked ok for a few days then to problem started again. So as soon as you turn it it trips out the main RCCD switch not the oven trip. I have changed the cooker wall switch - still happened then today I have changed both the cooker RCD and the RCCD and now very frustrated as it trips straight out as soon as I switch it on. The lights & clock light up but as soon as the oven is turned on - thats it. Please can someone advise..getting very frustrated