Without having the complete model number I will not be able to provide any model specific information, only general. Generally speaking the bake and broil elements alternate operation when it's in the Bake mode. Both elements in the oven must work in order for the oven to heat properly. The failure could one of the elements or possibly the control board. Turn the broiler ON to see if it heats and glows red. If it glows, the broil element is okay. Place the range in Bake and wait a few minutes and then open the door and then sprinkle a drop or two of water onto the bake element to see if sizzles. If the bake element is not working, the failure could be the bake element or the control board. In order to diagnose which one has failed will require
disconnecting the power supply from the range
and removing the bake element and testing the bake element for continuity using an ohm meter. You will need to disconnect the electrical connections from the bake element before checking the bake element for continuity.
I recommend resubmitting your question with the complete model number for model specific troubleshooting assistance. The model number will be behind the storage drawer along the frame.