Sud (also shown as SUDS or 5D) on a Samsung washer means the machine detected too many suds and paused to let them settle — it can't spin safely through a tub full of foam. The good news: this is one of the most often free-to-fix codes there is. Here's the order a tech runs through it.
By far the #1 cause. High-efficiency washers use very little water, so a normal dose — or any non-HE detergent — creates way more suds than the machine can handle.
Check it: Use only HE detergent and cut the amount (often just 1–2 teaspoons for a normal load). Run an extra rinse to clear the current suds. This alone fixes most Sud codes.
Once suds are present, the machine keeps reading Sud until they're gone — it can look "stuck" on the code.
Check it: Run a rinse + spin (or a Self Clean / tub-clean cycle with no detergent) to flush the foam out, then try your load again.
If water + suds drain slowly, foam sits in the tub longer and trips Sud. A partly-clogged debris filter is the usual culprit.
Check it: Clean the debris filter behind the small door on the lower-front (towels ready — water comes out) so the machine can flush suds out fully.
Almost always a free fix — it's usually a detergent habit, not a broken part. If Sud keeps coming even with a tiny amount of HE detergent and a clean filter, a tech can check the drain and sensor.
In Middle Tennessee or the Baton Rouge area? We'll come to you, same-day. Anywhere else in the U.S.? Send a 10-second video, a real technician tells you exactly what's wrong for $50 (credited toward the repair), and we ship you the exact part. 24/7 — text, call, or upload anytime.
Run a rinse + spin (no detergent) to clear the foam, then going forward use only HE detergent and much less of it — often just 1–2 teaspoons. Too much detergent is the cause the vast majority of the time.
Either you're still using too much or non-HE detergent, or suds aren't draining out (a partly-clogged debris filter). Cut the detergent way down and clean the filter behind the lower-front door.
Usually not — it's the washer protecting itself from over-sudsing, and it's almost always a free detergent fix. If it persists with correct detergent and a clean filter, your $50 Quick Check credits toward any repair.