ErrorCodeDoctor
LG · Washing Machine (Front Load)

LG Washing Machine (Front Load) SUD error code

Difficulty: Easy · Cost: $0 · Duration: Wait for automatic cycle to complete

The SUD code appears when your LG washing machine detects an excessive amount of soap foam inside the drum. The machine automatically adds a suds-reduction cycle to break down the foam before continuing, which can add up to 2 hours to the total cycle time. If the suds are detected during the spin cycle the machine will pause to prevent water from leaking out. This is not a mechanical fault — it is almost always caused by using too much detergent or the wrong type.

Common causes

  • Too much detergent added for the load size
  • Using regular detergent instead of HE detergent in an HE machine
  • Detergent residue built up inside the drum from previous washes
  • Soft water conditions that cause detergent to foam more than usual

How to fix it

  1. 1

    Do not open the machine — let it complete the automatic suds reduction cycle

  2. 2

    Once the cycle finishes run an empty rinse cycle to clear remaining soap residue

  3. 3

    Reduce the amount of detergent you use in future washes

  4. 4

    Switch to HE detergent if you are not already using it

  5. 5

    Run a Tub Clean cycle to remove any detergent buildup inside the drum

Related LG Washing Machine (Front Load) error codes

1

OE

The washer cannot drain the water out of the drum

easy
2

IE

The washer did not fill with enough water within the expected time

easy
3

UE

The laundry inside the drum is unevenly distributed and the washer cannot spin properly

easy
4

CL

Child lock is active — the control panel is locked and cannot be adjusted

easy

SUD error — frequently asked questions

What does the SUD error mean on a LG washing machine (front load)?

Too many soap suds were detected inside the drum

What causes the SUD error?

The SUD error is usually caused by: Too much detergent added for the load size; Using regular detergent instead of HE detergent in an HE machine; Detergent residue built up inside the drum from previous washes; Soft water conditions that cause detergent to foam more than usual.

Can I fix the SUD error myself?

Yes — this is rated an easy fix that most people can do themselves, typically in Wait for automatic cycle to complete.

How much does it cost to fix the SUD error?

Fixing the SUD error on a LG washing machine (front load) typically costs $0, depending on parts and whether you do it yourself or hire a technician.

Is it safe to keep using my washing machine (front load) with the SUD error?

In most cases yes, but it's best to address the SUD error soon — see the fix steps below to resolve it.