Hello Dede, this code means that there is an issue with the display panel. Please unplug the unit for 1-2 minutes, and plug it back in. If you feel like you don't notice a change, please contact us via Facebook Messenger: http://m.me/samsungsupport 
Twitter: https://bit.ly/2pTYDc7 
LiveChat or Email: https://bit.ly/2z9FXFrt 
or by calling 1-800- SAMSUNG ^Penny