@bettstop could be your selector switch or your thermostat. Use this guide [guide|11194|Black and Decker Toast R Oven Knobs Replacement - iFixit Repair Guide|new_window=true] to get a good visual on the switch. Post some good images of those with your QUESTION. That might allow us to direct you how to test the switches [guide|11194|Black and Decker Toast R Oven Knobs Replacement - iFixit Repair Guide|new_window=true]