Samsung vrt nd or nb error code

ND is not draining, the washer probably has water in it and won't open. In which case you need to open the little tiny panel on the front of the washer and pull out the little hose and drain the washer and then clean our the filter next to the hose. NB means not balanced and the clothes have become unbalanced, move the clothes around and start it back up. If it happens a lot the washer is not on even ground and needs to be leveled.

It means it's not draining. Look at the front of the washer bottom left corner and open the little from cover and look for draining instructions to drain and clean the filter.