Hello, and thank you for using this service. I'll be helping you with your problem today.

F3 E2 means that your oven thinks your oven is too hot inside. Now, if you haven't given the oven a few hours to cool down, just wait a few hours and see what happens. If the error won't clear after a few hours, this is either a bad oven sensor or a bad display relay control board. You can't test the board but you can test the sensor. Open the door and remove the 3-4" long thin metal rod attached to the back wall. There are 2 screws holding the sensor on that you can remove and then pull the sensor forward until you can disconnect it. With a multimeter, check the resistance of the sensor at room temperature and it should be about 1080 ohms. If it's not, replace the sensor, otherwise you need to replace your relay board.

Now I understand that your door is locked right now because of the error code, so just give it some time and see if it cools down and unlocked. If not, you just need to manually open the door and replace the door latch assembly. It's not easy to manually unlock the door. You'll need to use a coat hanger and pull the latch assembly from RIGHT to LEFT by slipping it down between the door and the oven frame at the top. Force the latch over to the left and open the door.