LG Washer SUD Error Code: What It Means & What to Check

Q: My LG washer is showing a SUD error code. What does it mean?

A: On many LG washers, SUD means the washer has detected too many suds. In plain terms, there is too much soap foam in the tub, and the washer may pause or extend the cycle while it tries to clear the suds.

This is often caused by using too much detergent, using the wrong detergent type, or adding extra soap products. In many cases, no parts are needed. If the code keeps returning even with correct detergent use, a sensor-related issue (such as a pressure sensing problem) may need diagnosis.

Common Symptoms You May Notice

• SUD error code appears during wash or rinse
• Cycle takes longer than expected
• Washer pauses while trying to reduce suds
• Excess foam visible in the drum or door glass (front-load models)
• Poor rinse performance or repeated rinse attempts
• Error returns on multiple loads

Safety First (Homeowner-Safe)

• Avoid adding more detergent when the washer shows a SUD error.
• Do not force the door open during a locked cycle.
• If suds overflow, unplug the washer and wipe up water/foam promptly to prevent slips.
• Use only washer-safe detergent products as directed by the label.
• Keep children and pets away from spilled detergent or suds on the floor.

Quick Checks You Can Try First

1. Confirm you are using HE detergent
   High-efficiency (HE) detergent is required for many LG washers. Non-HE detergent can create excessive foam and trigger SUD.
2. Reduce detergent dosage
   Even HE detergent can cause too many suds if too much is used. Use the amount recommended for load size and soil level.
3. Avoid “extra” soap products
   Extra detergent boosters, hand-wash soaps, or too much softener can contribute to oversudsing.
4. Run a rinse/spin cycle to help clear suds
   After the washer settles, a rinse/spin cycle can help remove leftover detergent foam from the tub and clothes.
5. Rewash heavily soapy loads without adding detergent
   If laundry still feels soapy, run another rinse cycle only.
6. Watch for repeat SUD errors with correct detergent use
   If SUD keeps returning even with proper HE detergent and dosage, service may be needed.

Common Causes of an LG Washer SUD Error

• Too much detergent used
• Wrong detergent type (non-HE detergent)
• Multiple soap products causing oversudsing
• Detergent buildup from repeated overuse
• Load type trapping excess soap (towels/bulky items can hold detergent)
• Pressure sensing issue (if SUD recurs despite correct detergent use)

Likely Parts / Components Involved

• Not usually a parts failure
• Occasionally pressure sensor / water level sensing components (if recurring without oversudsing cause)
• Related sensing hose/wiring (less common, service diagnosis)

When to Call Beacon Services & Appliances

If the SUD code keeps appearing after switching to the correct HE detergent and reducing the dosage, the washer may need diagnosis for a sensing issue. A technician can check the pressure sensing system and make sure the washer is reading water and foam conditions correctly.

At Beacon Services & Appliances, our friendly technicians in yellow can help diagnose recurring LG washer SUD errors and get your washer running normally again.

Request service online or call (352) 726-7530. You can also visit www.BeaconSaves.com.

📍 Contact Beacon Services & Appliances
📞 (352) 726-7530
🌐 www.BeaconSaves.com