LG Washing Machine sud error code

The washer detected too many soap suds. It adds a suds-reducing cycle, which can add up to 2 hours to the wash.

Also shown as: sud, SUD, Sud, Suds

Last updated: October 6, 2026

Quick answer: LG washing machine error code sud: too many suds detected. The most common cause is too much detergent. Try this first — let the reducing cycle finish. If that does not clear it, run Rinse and Spin to clear suds.

What causes the sud error?

  • Too much detergent
  • Non-HE detergent used in an HE washer
  • Soft water combined with a normal detergent dose
  • Detergent buildup from previous washes

How to fix LG sud — step by step

Work through these in order, from simplest and safest first. Stop as soon as the code clears.

  1. Let the reducing cycle finish
    The washer handles the suds on its own. Do not add more detergent or open the door repeatedly.
  2. Run Rinse and Spin to clear suds
    If suds remain, turn the washer off and on, then run a Rinse+Spin cycle with no detergent to flush them out.
  3. Use less HE detergent next time
    Switch to high-efficiency (HE) detergent and use the smallest recommended dose. In soft water areas, use even less.

When to call a technician

Stop and call a qualified technician if any of these apply:
  • SUD appears on every load with correct detergent
  • The washer will not drain the sudsy water
  • You suspect a drain or pressure sensor fault
  • Detergent residue smell never goes away

Frequently asked questions

Why does the cycle take 2 extra hours with SUD?

The washer pauses and runs extra rinses to break the foam down safely instead of spinning a foam-filled drum.

I used the normal amount. Why SUD?

Normal amounts of non-HE detergent foam far too much in HE washers. The detergent type matters more than the amount.

Can suds damage the washer?

Occasionally, no. Chronic over-sudsing leaves residue that causes odors and can confuse sensors.

Sources

Every meaning and fix above was checked against official manufacturer documentation:

FixCode provides general troubleshooting information only — not professional repair advice. If you are unsure about any step, stop and call a qualified technician. Repairs done incorrectly can be dangerous and may void your warranty.

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