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Hello, the first thing you want to check is that the bake & broil element are actually working. If both are in fact working, the sensor would be the culprit.
On the back wall of the oven is a small sensor. It tells the computer when to send power to the elements so they keep an accurate temp. The sensor should have a resistance reading of 1080 ohms at room temp. If the sensor does test good, the board would be faulty. I work on the honor system here at Just Answers. I'm not credited for my work until you rate my answer positively using the star rating system at the top of your page. Thanks