I have a Neff B1430N0GB/02 Oven, which is not working correctly . If I use Circotherm on the Function Selector, the oven partially heats, but the indicator shows that the temperature (say 180 degrees) has been reached in say 2 minutes (which is not possible). If I select Radiant Grilling and set the temperature, the grill heats normally to full temperature and the indicator does not show correct temperature until that is reached. I suspect the main element is faulty, but I am concerned that there may be a second fault in the thermostat. Can anyone help please. Thanks in anticipation.