What Sd means
The washer detected an over-sudsing condition and paused to let the suds settle. It continues on its own; the code may flash again at the end as a reminder.
Also shown as: SUd, 5d, 5Ud, depending on the model.
Likely causes
- Too much detergent, or non-HE detergent
Safe first checks
- Let the cycle finish, then use less HE detergent next time. Run a rinse or an empty cycle to clear leftover suds.
When to stop
Samsung says this code doesn't mean service is needed.
Checked against: Samsung US: Washing machine information and error codes; Samsung Russia: Sud (5ud) or Sd (5d) on the washer display. Codes can differ by model and year, so confirm with your owner's manual.