Frequently Asked Questions Do I have to preheat my Philips indoor grill? Preheating your Philips grill will ensure that your food is grilled in the shortest possible time for the best possible taste. Barbecue grid Pre-heat the barbecue grid (1) for 6 minutes. This will ensure that the barbecue grid is at the right temperature when you start grilling. Grilling grid There is no need to preheat the grilling grid (2). You can start grilling immediately after you switch on the grill.