U 1 error message

U1 is a right cover open error. So either that cover is not closed all the way, the tab on the door itself is not hitting the sensor that detects if it is closed, the sensor itself isn't working properly and lastly it could be board malfunctions. Most times on this model it is either a broken tab on the door or it is not shutting correctly. The front door has to be completely shut before the right door will shut. If you are looking at the right dooor straight on the sensor is at the bottom left corner of the machine. There is a little **** in the plastic that is where the sensor is. There is a piece of plastic on a spring that is on a guide that slides back when "triggered" some times that can come off the guide.
Hope this helps.