Not sure about your make , but if 1 half of the unit works ( The top elements in your case) and the oven doesnt, I would suggest that there may be 2 fuses in your meter box ( If the oven is wired across 2 phases) or there may be 2 fuses in the back of the oven and the fuse that protects the oven has failed. If unsure, be safe and get an Electrician or a stove technician to sort it out for you.
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Not sure about your make , but if 1 half of the unit works ( The top elements in your case) and the oven doesnt, I would suggest that there may be 2 fuses in your meter box ( If the oven is wired across 2 phases) or there may be 2 fuses in the back of the oven and the fuse that protects the oven has failed. If unsure, be safe and get an Electrician or a stove technician to sort it out for you.