Unplug it and then open i t up. You are looking for a piece of shredded paper that is stuck or jammed. Can even be a accumulation of paper dust. The piece won't be that big but most of the time that is all that is wrong. The paper either jams the door sensor or blocks it and gives the error. It can also be a bad door sensor or switch. Not very common but can happen.
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Unplug it and then open i t up. You are looking for a piece of shredded paper that is stuck or jammed. Can even be a accumulation of paper dust. The piece won't be that big but most of the time that is all that is wrong. The paper either jams the door sensor or blocks it and gives the error. It can also be a bad door sensor or switch. Not very common but can happen.