yOUR OVEN MUST HAVE 2 SETS OF ELEMENTS, TOP AND BOTTOM(unseen by you since in the bottom cavity) AND FAN ELEMENT( near to circular in shape, with fan located in the centre, in the back, also concealed). YOUR DESCRIPTION SEEM TO BE AN ELEMENT BURNT AND GOT HOLE IN IT. BUT U WILL HAVE TO ESTABLISH WHICH ONE DEPENDING ON WHICH ONE OF THE TWO SETS IS NOT HEATING. TRY THE GRILL AND IF THAT COMES ON OK, THEN YOU ARE LOOKING AT FAULTY FAN ELEMENT.
NII DAN
November 2008