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So this error code means that the oven thinks the oven is getting too hot. You'll want to shut the oven off or unplug it right now. Wait for the oven to get to room temperature and then test resistance through the oven sensor after removing. The resistance of the sensor should be 1080 ohms at room temperature. If not then replace the sensor--otherwise you have a faulty control board that would need to be replaced I'm sorry to say.
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Once the oven cools off, it's attached to the back wall inside the oven near the top. Below is a link to the sensor you're looking for. You can either pull it forward after unscrewing it if the screws are inside the oven, or just pull the oven forward and remove the back sheet metal panel to expose the plug to the sensor and unplug the sensor to test it.
CLICK HERE for sensor