LG Washer SUD Error: Excessive suds / over-sudsing
LG washer error — here’s what you need to know. The SUD error code on your LG washer indicates excessive suds detected inside the drum. This is a Low severity issue. What Does SUD Mean on an LG Washer? SUD (sometimes displayed as SUDS or Sud) means the washer’s sensors have detected an abnormally high […]
~90%
DIY Fixable
From $0 (detergent fix) — $200 (pump/sensor)
Typical Repair Cost
10 minutes – 1 hour
Pro Repair Time
Quick Assessment
Answer to continue safely
Is it safe to keep using?
Yes. SUD does not indicate a mechanical failure. The washer is safe to use once the suds clear. Correct your detergent type and quantity before the next load.
Can I reset the code?
Yes. The SUD code clears automatically once the washer successfully drains the excess foam through its built-in extended rinse. No manual reset button is required.
When to stop immediately?
Stop if you notice: Stop the cycle if water or suds are actively leaking onto the floor — risk of slip hazard and water damage., Stop if the SUD code returns on every cycle even after using the correct HE detergent in the minimum dose..
Symptoms You May Notice
Visible foam visible through door glass or around the door seal
A thick layer of soap foam is visible through the porthole glass or seeping around the rubber door gasket during the wash or rinse phase.
SUD code on display with cycle paused
The washer halts mid-cycle and displays SUD, then automatically attempts additional rinse passes to break down the foam.
Cycle runs unusually long
The machine adds one or more unplanned rinse cycles to flush out suds, extending total cycle time well beyond the original estimate.
Slow or incomplete drain
Thick suds can partially block the drain pump impeller, causing the drum to drain slowly or leave a small amount of water after the spin.
Possible Causes
Excess detergent or wrong detergent type
Using non-HE detergent or exceeding the HE detergent dose guideline generates far more foam than the drum and pump can handle.
DIY PossibleDetergent residue buildup in drum and dispenser
Soap deposits from repeated over-dosing accumulate on the drum walls and dispenser tray, re-activating as foam in subsequent cycles.
DIY PossibleFaulty pressure sensor or drain pump
A malfunctioning water-level pressure sensor can falsely detect suds, or a worn pump may fail to clear foam efficiently even at normal detergent levels.
Requires ProfessionalSafe Checks You Can Do
-
1
Let the washer complete its automatic rinse
Do not cancel the cycle. LG washers automatically add rinse passes to break down suds. Wait for the machine to clear the code on its own before intervening.
-
2
Reduce detergent and switch to HE formula
For the next wash, use only HE-labeled detergent and fill only to the lowest line of the measuring cup or as specified by the detergent manufacturer for your load size.
-
3
Run a Tub Clean cycle
Run LG's built-in Tub Clean cycle (without clothes or detergent) to flush residual soap deposits from the drum, gasket, and pump.
When to Call a Professional
Contact a qualified technician if:
- SUD persists after multiple Tub Clean cycles and confirmed correct HE detergent usage — pressure sensor likely faulty.
- Drum consistently fails to drain fully despite low suds — drain pump may need replacement.
- Water visible leaking from door gasket during sudsing event — gasket seal inspection needed.
Need Professional Help?
Find qualified technicians in your area for proper diagnostics and repair.
Washer Repair Service Schedule Appointment