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4.5 cu. ft. Ultra Large Capacity Smart Front Load Washer

LG WM3420CW

Features

  • Enjoy a 2-year limited warranty on select appliances purchased through April 08, 2026 via the ThinQ® app. Terms apply.
  • 4.5 cu. ft. Ultra Large Capacity lets you clean larger loads
  • 6Motion™ technology uses different wash motions for a thorough clean
  • With ColdWash™ technology, clean like warm and save like cold

Quick Specs

  • Type: Washer
  • Style: Front Loading
  • Fuel: Electric
  • Energy Star Rated: No

See More

 
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Get A Custom Clean

Based on the cycle you select, LG 6Motion™ technology uses up to 6 different wash motions, each designed to get clothes cleaner and help them last longer. Options range from a scrubbing PowerMotion that helps to dissolve stains to the gentle Swinging motion that's ideal for delicates.

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Cleans Like Warm, Saves Like Cold

Saving energy doesn't have to mean compromising on cleaning with the ColdWash™ option. Powered by the LG Direct Drive Motor and 6 motion™ technology, it's ideal for cleaning all types of clothes-even those you normally wash in warm water. Can be used with almost any wash cycle and virtually all fabric types.

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Built-in Intelligence Takes Out The Guesswork

Forget about endless sorting or toggling through cycles-built-in sensors use AI technology to detect fabric texture and load size, then automatically select the right wash motions, temperatures and more for advanced fabric care.

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Count On Quiet, Efficient Performance

Backed by a 10-year limited warranty, the LG Direct Drive Motor delivers peace of mind with every load. Fewer moving parts means less noise and vibration, greater stability and durable performance you can depend on for years to come.

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Go Big To Save Time And Get More Done

Say never again to never-ending piles of laundry-this ultra large capacity washer fits more clothes in every load and helps you power through laundry day in less time. Bring on big loads of towels or jeans -this 4.5 cu. ft. washer fits more in every load up to 20 lbs.

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Smooth Surface Helps Prevent Snags

Unlike tubs made from porcelain or plastic, the LG NeveRust® Stainless Steel Tub avoids the chips and nicks that can snag fabrics and ruin clothing.

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More Style, Less Space.

LG closet-depth washers and dryers have a shallower depth to fit in more places & add sleek style to any room.

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Wash Two Loads At The Same Time

Add the one-of-a-kind LG SideKick™ pedestal washer and wash small loads that just can't wait in the compact washer below while you do a big load up top. Warm and cold settings and 6 cycles let you care for all types of items, from delicates and hand washables to workout wear and baby clothes. Elevate your washer for easier loading and unloading.

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A Smarter Home Starts with the ThinQ® app

The ThinQ® app offers control and convenience for smart LG appliances to help you simplify life and enjoy the comforts of home. Manage and monitor your washer remotely, track and download cycles, connect with Google or Alexa voice assistants, and access smart diagnosis, customer support, and more. ThinQ Care appliances send usage, maintenance, and diagnostic alerts to help you keep them running smoothly. ThinQ UP appliances receive software updates for new features and enhancements. Learn More.

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Measure First, Order Right.

Nothing is more frustrating than an appliance that doesn't fit. We'll help you find the right one for your space. Watch the Full Movie with Audio Descriptions Watch the Full Movie

Get A Custom Clean Based on the cycle you select, LG 6Motion™ technology uses up to 6 different wash motions, each designed to get clothes cleaner and help them last longer. Options range from a scrubbing PowerMotion that helps to dissolve stains to the gentle Swinging motion that's ideal for delicates.

Cleans Like Warm, Saves Like Cold Saving energy doesn't have to mean compromising on cleaning with the ColdWash™ option. Powered by the LG Direct Drive Motor and 6 motion™ technology, it's ideal for cleaning all types of clothes-even those you normally wash in warm water. Can be used with almost any wash cycle and virtually all fabric types.

Built-in Intelligence Takes Out The Guesswork Forget about endless sorting or toggling through cycles-built-in sensors use AI technology to detect fabric texture and load size, then automatically select the right wash motions, temperatures and more for advanced fabric care.

Count On Quiet, Efficient Performance Backed by a 10-year limited warranty, the LG Direct Drive Motor delivers peace of mind with every load. Fewer moving parts means less noise and vibration, greater stability and durable performance you can depend on for years to come.

Go Big To Save Time And Get More Done Say never again to never-ending piles of laundry-this ultra large capacity washer fits more clothes in every load and helps you power through laundry day in less time. Bring on big loads of towels or jeans -this 4.5 cu. ft. washer fits more in every load up to 20 lbs.

Smooth Surface Helps Prevent Snags Unlike tubs made from porcelain or plastic, the LG NeveRust® Stainless Steel Tub avoids the chips and nicks that can snag fabrics and ruin clothing.

More Style, Less Space. LG closet-depth washers and dryers have a shallower depth to fit in more places & add sleek style to any room.

Wash Two Loads At The Same Time Add the one-of-a-kind LG SideKick™ pedestal washer and wash small loads that just can't wait in the compact washer below while you do a big load up top. Warm and cold settings and 6 cycles let you care for all types of items, from delicates and hand washables to workout wear and baby clothes. Elevate your washer for easier loading and unloading.

A Smarter Home Starts with the ThinQ® app The ThinQ® app offers control and convenience for smart LG appliances to help you simplify life and enjoy the comforts of home. Manage and monitor your washer remotely, track and download cycles, connect with Google or Alexa voice assistants, and access smart diagnosis, customer support, and more. ThinQ Care appliances send usage, maintenance, and diagnostic alerts to help you keep them running smoothly. ThinQ UP appliances receive software updates for new features and enhancements. Learn More.

Measure First, Order Right. Nothing is more frustrating than an appliance that doesn't fit. We'll help you find the right one for your space. Watch the Full Movie with Audio Descriptions Watch the Full Movie

Features

  • Enjoy a 2-year limited warranty on select appliances purchased through April 08, 2026 via the ThinQ® app. Terms apply.
  • 4.5 cu. ft. Ultra Large Capacity lets you clean larger loads
  • 6Motion™ technology uses different wash motions for a thorough clean
  • With ColdWash™ technology, clean like warm and save like cold
  • Built-in intelligence takes out the guesswork-AI technology selects optimal wash settings
  • Get the ThinQ® app to access smart functions, ThinQ Care™ alerts and download new ThinQ UP™ features
  • Direct Drive Motor 10-Year Limited Warranty
  • ENERGY STAR Certified for an efficient clean that saves on water and energy
Laundry Appliance Capacity
Capacity 4.5 cu. ft.
Summary
Product Color White (W)
Dial-A-Cycle™ Yes
Hard Buttons No
Electric Dryer Option DLE3420W
Gas Dryer Option DLG3421W
Series LG
Touch Buttons Yes
Type Front Load Washer
Energy
CEE Tier 3
ENERGY STAR® Most Efficient Yes
ENERGY STAR Certified Yes
IMEF 3.1
IWF 2.9
Washer Programs
No. of Washer Programs 10
Washer Programs Quick Wash, AI Wash, ColdWash™, Bedding, Delicates, Downloaded, Heavy Duty, Normal, Perm. Press, Tub Clean
No. of Washer Options 8
Washer Options Delay Start, Control Lock, Extra Rinse, Pre-wash, Remote Start, Signal, Spin Only, Wi-Fi
No. of Wash/Rinse Temps 5
Wash/Rinse Temps Hot, Semi Warm, Warm, Cold, Tap Cold
No. of Spin Speeds 5
Spin Speeds Extra High, High, Medium, Low, No Spin
Water Levels Load Sensing
No. of Soil Levels 3
Fabric Care Features
Turbowash® No
AI DD® Yes
Soil Level Sensor No
Allergiene™ Cycle No
ColdWash™ Option Yes
Sanitary Cycle No
Steam Technology No
Laundry Appliance Convenience Features
4 Tray Dispenser Prewash, Main Wash (with liquid detergent cup), Bleach, Fabric Softener
Auto Suds Removal Yes
Control Lock Yes
Drum Light No
End of Cycle Signal Yes
Leveling Legs Yes
LoadSense Yes
Cabinet Vibration Sensor Yes
True Balance® Anti-Vibration System Yes
Laundry Appliance ThinQ® Smart Features
Energy Monitoring Yes
NFC Tag On No
PCC No
SmartDiagnosis™ (v3.0) Yes
Tub Clean Coach Yes
Wi-Fi Yes
Motor
Axis Horizontal
Max RPM 1260
Motor Type Inverter Direct Drive Motor
Materials and Finishes
All Available Colors White (W)
Cabinet Painted Steel
Control Panel Plastic
Door / Rim Glass/White Rim
Door Cover Clear Round Cover
NeveRust™ Stainless Steel Drum Yes
Top Plate Painted Steel
Power Source
Washer Electrical Requirements 120 V, 60 Hz, 6 A
Ratings UL Listed
Washer Power Source Type Electric
Options/Accessories
LG Sidekick™ Pedestal Washer WD300CW
Pedestal WDP6W
Stacking Kit KSTK4
Dimensions
Carton (WxHxD) 29 3/4" x 41 7/8" x 31 1/2"
Depth with Door Open (55" D with door open)
LG Sidekick™ Pedestal Washer (WxHxD) 27 x 14 1/8 x 30 3/4 (50 1/2 D with door open)
Pedestal (WxHxD) 27" x 13 5/8" x 28" (43 7/8" D with door open)
Product (WxHxD) 27" x 39" x 30 1/4"
Weight (Product/Carton) 185.2 / 198.4 lbs.
Warranty & UPC
Direct Drive Motor 10 Years
Drum 3 Years
Parts and Labor 1 Year
UPC 048231349895

Quick Specs


  • Appearance

  • Type: Washer
  • Style: Front Loading
  • Fuel: Electric

  • Features

  • Energy Star Rated: No

Professional delivery and installation is available for every product we sell. We would be happy to coordinate delivery and installation for you.

Extended warranties are usually very inexpensive and can save you thousands in the future. Some can even cover extra costs that result, such as cost of food that spoils when your fridge dies. It's simple and inexpensive to purchase extended warranties and one of the smartest ways to protect your investment.

Appliances can be large, heavy and expensive. You probably don't have the special tools or expertise needed to fix them in a crisis. If you can spare a few thousand dollars without batting an eyelash for new appliances should they break tomorrow, don't buy a warranty. But if you're like most of us, protect yourself by purchasing inexpensive extended warranties when you buy a new product and save yourself big money in the long run.