Error code
Samsung Washing Machine Error Code SUD
The washer has detected too much foam inside the drum. The most likely cause is too much detergent for the load size. Check first: use less detergent on the next load and make sure it is suitable for automatic washing machines.
Quick decision
SUD
What it usually means
The washer has detected too much foam inside the drum.
First safe action
Turn the machine off and let the foam settle before trying to restart it.
Stop and call an engineer when
Call an engineer if SUD returns repeatedly with correct detergent use, or if it appears alongside drainage, fill, or leak-related faults.
Meaning
Samsung washing machine error code SUD usually means the machine has detected oversudsing. In most cases, this happens because too much detergent was used, the wrong detergent type was added, or foam is slowing drainage and confusing the water-level readings.
Check first by stopping the cycle and letting the foam settle. If the machine also struggles to drain, compare the fault with Samsung 5C, while repeated water-level warnings can overlap with Samsung 1C.
In practice, SUD is commonly linked to Too much detergent for the load size, Wrong detergent type, especially non-HE detergent, or Foam slowing drainage or affecting level sensing.
Likely causes
- Too much detergent for the load size
- Wrong detergent type, especially non-HE detergent
- Foam slowing drainage or affecting level sensing
How to fix it safely
- Turn the machine off and let the foam settle before trying to restart it.
- Use less detergent on the next load and make sure it is suitable for automatic washing machines.
- Run one rinse or drain-only cycle after the foam has dropped; if the machine still will not drain properly, compare the symptoms with Samsung 5C.
Can I fix this myself?
YesSUD is usually one of the more DIY-friendly Samsung washing-machine codes because the first fix is correcting detergent use and letting the foam clear.
Safety boundary: Stop if the machine also leaks, repeatedly overfills, or keeps failing even when you are using the correct detergent dose.
When to call an engineer
Call an engineer if SUD returns repeatedly with correct detergent use, or if it appears alongside drainage, fill, or leak-related faults.
Safety warning
Disconnect the appliance from the mains before opening any filter or checking for drainage problems.
Useful hub links
Related pressure and level fault codes
Samsung Washing Machine Error Code LC - Leak or Drainage Problem
The machine has detected a leak risk or water collecting where it should not.
Samsung Washing Machine Error Code OC - Overfilling Problem
The washer thinks the drum is overfilling or the water level is rising too high.
Samsung Washing Machine Error Code 1C - Water Level Sensor Problem
The washer is not getting a reliable water-level reading from the pressure sensing system.
Samsung Washing Machine Error Code 5C
The washer cannot drain the water away
Relevant guide
Frequently asked questions
Can I keep using a Samsung washing machine with SUD showing?+
Only after the foam has settled and you have corrected the detergent amount. Repeated restarts while the machine is full of suds can make the cycle run poorly.
Will resetting clear Samsung SUD permanently?+
Only if you also fix the detergent issue. If you keep using too much detergent, the code is likely to return.
Is Samsung SUD dangerous?+
Usually not, but repeated oversudsing can lead to drainage problems, poor rinsing, and occasional leak-style warnings.