LG Washer Sud/Sd Error: Excess Suds Fix

The Sud error on LG washers indicates the machine has detected excessive foam. This is a protective feature—too many suds can overflow, damage components, and prevent proper cleaning. The fix is simple: wait, and change your detergent habits.

Why Sud Error Occurs

LG’s High Efficiency (HE) washers use less water than traditional machines. This means:

• Less water to dilute detergent
• Suds have nowhere to go
• Sensor detects foam level and pauses cycle

Common causes:

1. Too much detergent — The #1 cause by far
2. Non-HE detergent — Regular detergent creates excessive suds
3. Soft water + normal detergent amount — Soft water needs even less detergent
4. Detergent residue buildup — From previous overuse
5. Fabric softener in drum — Should only go in dispenser

Immediate Fix: What to Do Now

Step 1: Wait

This is the most important step. The washer is designed to handle this:

1. Pause and wait 20-30 minutes
2. The washer may:
   • Add cold water to dilute suds
   • Run extra rinse cycles
   • Extend the drain time
3. In many cases, the cycle resumes automatically

Step 2: Check Progress

If the washer resumes:

• Let it complete the cycle
• Check the final rinse for remaining suds
• Items may need an additional rinse cycle

If the washer remains stopped after 30 minutes:

• Press PAUSE/CANCEL
• Select RINSE + SPIN cycle
• This flushes suds from the system

Step 3: Drain if Necessary

If the washer is full of water and suds:

1. Select DRAIN ONLY or SPIN ONLY
2. Let it pump out the water
3. If it won’t drain (suds clogging pump), wait longer for suds to dissipate

Preventing Sud Errors: Detergent Guide

Rule 1: Use Only HE Detergent

HE (High Efficiency) detergent is required for LG washers. Look for the HE symbol on the bottle:

• Low-sudsing formula designed for HE machines
• Works effectively with less water
• Rinses cleaner
• All major brands offer HE versions

Rule 2: Use Less Than You Think

Here’s the uncomfortable truth: detergent manufacturers want you to use more detergent. The cap measurements are designed to run through your bottle faster.

Recommended amounts for HE washers:

Load Size	HE Liquid	HE Powder
Small	1 tablespoon	1 tablespoon
Medium	1.5 tablespoons	1.5 tablespoons
Large	2 tablespoons	2 tablespoons
Very dirty	2 tablespoons max	2 tablespoons max

Compare to cap lines:

• Most caps measure 1-2 oz (2-4 tablespoons) for “normal” loads
• This is 2-4x more than you need

Rule 3: Adjust for Water Hardness

Soft water (common with water softeners):

• Use even LESS detergent
• Soft water makes detergent more effective
• Start with half the normal amount

Hard water:

• May need slightly more detergent
• Consider water softener or detergent booster
• Don’t exceed 2 tablespoons

Rule 4: Detergent Pods

If using pods:

• Use ONE pod per load
• Don’t use extra “for heavily soiled items”
• Place pod directly in drum, not dispenser

If Sud Errors Keep Happening

Clean Out Detergent Residue

If you’ve been overusing detergent, residue has built up inside the machine:

1. Run TUB CLEAN cycle with no detergent
2. Run a second TUB CLEAN with 1/2 cup white vinegar
3. Run a third TUB CLEAN with a washer cleaning tablet
4. Wipe out the detergent dispenser drawer

Check the Drain Pump Filter (Front Load Only)

Soap residue can clog the drain pump filter:

1. Locate the filter access panel (lower front of washer)
2. Place towels and a shallow pan to catch water
3. Open the panel and slowly turn the filter cap
4. Remove and clean the filter
5. Check for soap buildup inside the filter housing

Consider Your Detergent Brand

Some detergents are sudsiering than others, even within HE formulas:

Lower suds HE detergents:

• Tide HE Turbo Clean
• Persil ProClean
• Method 8X
• Seventh Generation Free & Clear

Watch out for:

• Heavily scented formulas (often sudsierer)
• “Concentrated” formulas (easy to overdose)
• Store brands (check for HE symbol)

Model Coverage

This guide applies to all LG washers displaying Sud or Sd:

Front Load (WM series): All models—particularly prone to Sud errors due to sealed drum design

Top Load (WT series): All models with impeller or agitator

When to Call a Tech

Contact LG support (1-800-243-0000) if:

• Sud error occurs with correct HE detergent amount
• Washer won’t drain after extended waiting
• Sud errors appear with NO detergent added
• Error occurs only on certain cycles

These may indicate sensor or drain system issues unrelated to actual suds.

Sources

For official LG support:

• LG Washer Sud Error
• LG US Support

Related Guides

• LG Washing Machine Error Codes: Complete Guide
• How to Reset an LG Washing Machine
• LG Washer tCL: Tub Clean Reminder