If you see this fault code, you may have used tool much detergent or a wrong one, which has resulted in suds. The manufacturer recommends using a particular type of HE detergent.
If your machine is sudded badly, it will not pump water through the system properly. The system has to extend the rinse mode to clear suds. Also, it will require more water. The washer may pause and rinse several times, and it will take much longer for the washer to finish the cycle. And there will be Sud or Sd flashing on the screen.
If you have adjusted the amount of detergent properly and are using the right type of it, but the error is still there, try running a cleaning cycle to remove the remaining ssud from the system. Follow the instruction manual.