GE Profile Double Ovens won't heat above 100

We have a GE Profile double oven set, with the top oven being a convection oven. The ovens won’t heat above 100. The broiler works on both. I can trick the bottom one (regular oven) to work if I turn broiler on for a minute so temp goes above 100, then can switch to bake for whatever temp I want. The top convection one will not work with this trick. Help please!