GE Profile gas oven will not heat broil and cooktop work fine

My Gas GE Profile oven will not heat up. The gas burners on the top of the oven as well as Hi and Low broil work fine. The oven is 5-6 years old. Is this a repair I can make on my own? What parts do I need to check or replace? There is no error code on the electronic key pad when the oven is on, it just reads 100 degrees and does not heat up. Can you walk me through step by step? Thanks