The ND fault code stands for “no drain’ and indicates a problem in the drain system. Particularly, the drain pump may be blocked or faulty. Check the drain pump for foreign objects (socks or other small items). Remove them, if any, and restart the cycle. There may be a more serious pump issue, which requires a serious repair or replacement of the whole pump.
Not unlikely, you have been using a wrong type of detergent, which has sudded the drain system. Consult your maintenance service provider and choose the right type of detergent.