"BURN" is a warning that appears on newer models. This is a sign the Instant Pot is being overheated because the bottom of the pot is getting dry, cause it to be unable to build pressure. The best way to prevent the "BURN" warning is to read the recipe and get all your ingredients ready before you start cooking with your Instant Pot. If you aren't ready for the next step in the recipe, the liquids tend to evaporate and the Instant Pot won't build pressure.