If the lower section of your oven is no longer heating up leaving your food undercooked, then you may have a fault with the heating element.
Heating element faults can cause your oven to not heat enough to operate efficiently or effectively. Over time, the lower element can age, breaking continuity and preventing electricity from flowing through the conductor.
Use this genuine replacement Lower Heating Element to ensure your oven heats up correctly.
Please check model fit list to ensure this part is correct for your model.