Sometimes they can be reset, but most of the time, if it doesn't reset after the cabinet has cooled down, it will permanently remain open.
With the smoker off, open the door and look inside the cabinet, on the left side about 1/4 of the way down from the top you will see a disc about the size of a quarter. That is the high temperature heat sensor. If you don't see it, you will need to remove some of the seasoning in that area. Once located, clean the sensor off, and apply an ice cube on it for a few minutes. Next turn the unit on and make sure the temperature is set to high, and see if the power indicator light comes on, and the elements work.
If this doesn't work it can still be the inline fuse. Hopefully this trick will work for you. There is no way to visually check the inline fuse to see if it is good. You will need a multimeter to test continuity. The other way, which I don't recommend unless you are knowledgeable of electricity, is to use a 14ga wire or larger to bypass the fuse, during the testing period only. If you bypass the fuse, and the element works, then you need a new fuse. Unhook the wire, and do not operate Bradley with the fuse bypass.
By chance, if the power indictor light is working but you are not getting heat, you know that the sensor was reset, and you have a bad element.