When bake is turned on the unit comes on for half a minute and goes off after that. After four minutes the f3 code appears.
The "F3" error code means that the control board senses the oven temperature sensor open.
Remove the oven sensor harness from the control board and measure the sensor resistance. It suppose to be about 1100 ohms at the room temperature.
If the reading is incorrect, replace the oven sensor.
If the reading is correct, replace the oven control board.
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The oven sensor WB21T10007
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The oven control board WB27T11252
Here are the breakdown diagrams and http://www.appliancepartspros.com/partsearch/model.aspx?model_id=5200844
Gene.