Barbecue when you want to use a special grill should have to pay for the free On to "grill" then is completely no microwave heating pure grill. If set to "microwave grill" is part of the heating is microwave and the other part is grill heating. "Microwave" is pure microwave heating. It is best to refer to the manual operation do not all of a sudden open a few minutes slowly feel sure to master the required heat