What should happen during the oven mode test for 5000 Series models?
Turn the cooking mode selector knob to BAKE. The following should occur: 350°F (the default baking temperature) and COOK appear in the display; the red preheat indicator lights up; and the oven light and fan turn on. If any of these do not occur, contact Bosch service at 800-944-2904.
From the official Bosch HBL503 500 Series Single Wall Oven manual, page 7
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