Samsung · Washing Machine
Samsung Washing Machine SUD Error Code
Excess suds slowing drain and spin
What this error means
SUD (also shown as 5Ud) means Samsung detected excessive suds during drain or spin. The washer extends drain time trying to break foam and may pause with SUD on the display until suds level drops.
How SUD is detected
When SUD appears on a Samsung washing machine, the control board has confirmed that water did not leave the machine within the programmed drain window. On Samsung WF45T6000AW, Samsung WA52A5500AW, and similar variants, the drain pump runs for a fixed interval—often three to seven minutes on washers and dishwashers—while a pressure switch or turbidity sensor verifies the tub or sump is empty. If water remains, the cycle stops to prevent spin with a full tub or overflow on the next fill.
Most SUD calls are resolved without parts: run rinse and spin with no detergent. Restricted drain paths mimic pump failure because the impeller spins against a blocked hose or filter. Document whether the pump hums audibly during the drain step; a humming pump with no water movement points to a clogged filter or kinked hose, while silence may indicate a failed pump motor or loose wiring at the harness.
After clearing blockages, run a short cycle and listen at the drain hose for steady water flow. If SUD returns on the next load with a clean filter and straight hose, measure resistance at the pump motor connector per the service manual for your model before ordering a replacement pump assembly.
Common causes
- Non-HE detergent or double dose creating foam
- Liquid fabric softener in the wrong dispenser compartment
- Cold wash with powder that needs warmer water to dissolve
- Partial drain restriction trapping sudsy water in the tub
Step-by-step fixes
- 1Cancel and run Spin Only with no detergent on an empty drum
- 2Switch to HE detergent at the marked lines in the dispenser drawer
- 3Add one cup of white vinegar to an empty hot rinse to cut foam
- 4Clean the pump filter if suds were visible when SUD appeared
When to call a technician
SUD every cycle with correct HE detergent on an empty tub suggests drain pump or pressure sensor service.
Affected models
- Samsung WF45R6100AW
- Samsung WA52M7750AW
- Samsung WF45T6000AW
Prevention & maintenance
- Clean drain filters and hose terminations monthly on high-use washing machines to prevent SUD from lint and food debris buildup.
- Record when SUD appears in the cycle and whether it clears after a 60-second power reset on your Samsung washing machine—that detail speeds diagnosis if you call service.
- Keep the model and serial number from the rating plate when ordering parts for SUD; Samsung uses multiple revisions with different harness lengths and board firmware.
- Photograph wiring connector orientation before disconnecting any component while troubleshooting SUD; reversed plugs on pumps and valves cause immediate repeat faults.