Got a call for this cooker where the oven was not heating and would now trip the rccb as soon as cust set timer.
I of course went straight in with a new oven element which worked, so after checking it was heating for 1 or 2 minutes I turned it off … and it blew the trip.
The megger shows the appliance has low insulation, I disconected all the elements and the fan motors, still low insulation.