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Hello, the F3 code is for the oven temperature sensor. It may have failed open or shorted. Here is something to try. Turn off the power for a few minutes and then try again and if needed allow the oven to cool and see if the door will open. If that does not work, set the oven for clean and wait until the door fully locks and then hit cancel and it should unlock. If none of this works the oven will need to be pulled out to test the sensor with a meter. Let me know what happens.