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Key Features

  • TurboWash™ 360 Technology
  • SmartThinQ® Technology
  • Allergiene™ Cycle / AAFA Certified
  • Steam Technology
  • 4.5 cu.ft. Capacity
  • LG SideKick™ Compatible

available colors:

Black Steel
Suggested Price


Suggested Price
Promotion Price*


Promotion Price*

AAFA Certified LG Washers

LG washers with the Allergiene™ Cycle use the power of steam to remove over 95% of pet dander and dust mites.


Power Clean Big Loads in Under 30 Minutes*

Five powerful jets with variable sprays surround clothes from multiple angles, so detergent can penetrate deep into fabrics for a complete clean—even for big loads—in under 30 minutes*.

*Based on independent testing comparing models WM3900HBA and WM4370HWA in normal cycle with TurboWash™360° option, 10 lb. load vs. TurboWash® 2.0 option, 8 lb. load (Feb. 2019).


Think you can’t do laundry on the go? Think Again.

Expand the limits of your laundry room with the LG SmartThinQ® app. Select a cycle, start or stop the wash and get notifications about when your laundry will be done, all from your smartphone. It even works with the Google Assistant and Amazon Alexa, so you can manage your laundry with simple voice commands.


Deep Clean With Steam

Our steam technology gently but powerfully penetrates fabrics to virtually eliminate dirt, odors and wrinkles.


For Small Loads that Can’t Wait

Whether it’s your kids’ favorite shirt, yoga pants or a school uniform, washing a full load seems wasteful for just a few pieces. Now you can wash small loads that just can’t wait with the LG SideKick™ Pedestal Washer or wash two loads at once to save time.


Get it All Done In Less Time

Ultra-large capacity (4.5 cu.ft.) means you have the room to do more laundry in fewer loads.


ColdWash™ Technology

Using the cold cycle on your washer doesn’t have to mean compromising. ColdWash™ technology uses cold water and enhanced washing motions to penetrate deep into fabrics, giving you cold water savings with warm water performance.

Washer/dryer stacked on a black background with an outline drawing of a kithcen

Fits in More Places

Get extra capacity without taking up extra space, thanks to a 30” depth that easily fits into smaller spaces or second floor closets.


Warranty / Certifications



What People Are Saying

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Ask your questions. Share your answers.
Please first review the detailed product information and help guides in the Product Support section for this product prior to posting a question.

The video doesn’t explain much. What is the purpose of the drawer on the bottom?

Asked by: WhiskeyTangoFoxtrot
There is a picture here that says they drawer is an small loader for small loads or 2 loads at once
Answered by: Curtis81
Date published: 2019-05-14

Will it clean tough loads? Farm clothes, dirt, grease, mechanics clothing, etc

Asked by: BB37
Oh yes perfect for that
Answered by: Roxie d
Date published: 2019-05-11

How many pounds of dry laundry can it hold. For example a commercial dexter washer can do 30lbs of dry. I need a HUUGE washer. Also is this a water saving machine, I don't want it to save water, I want it to actually wash my clothes.

Asked by: sandy11
As given in the title description, the ENERGY STAR® Qualified LG 4.5 cu.ft. Smart wi-fi Enabled Front Load Washer with TurboWash™ 360 Technology, Model # WM3900HBA has a capacity of 4.5 cubic feet. While this is a volumetric capacity that cannot be directly converted to weight, the washer will hold about 18 - 20lbs of laundry. This washer is a High-Efficiency Washer that features technology that helps to reduce the amount of water and energy needed to do a load of laundry. It will use up to 80% less water than traditional, top-loading washers, and deliver 65% energy savings, and also can wash more laundry in one go than traditional machines...^IFV
Answered by: Ivanf
Date published: 2019-05-06

Will delay start be available on the phone app? Also what is the difference between TurboWash 2.0 and TurboWash 360.

Asked by: jkliving
The LG SmartThinQ® application that you can download on your smartphone so you can communicate with the Energy Star Qualified LG 4.5 cu.ft. Smart wi-fi Enabled Front Load Washer with TurboWash™ 360 Technology, Model # WM3900HBA has a Remote Start feature that you can enable and then start a cycle on the washer with from your smartphone. It does not feature a Delay Wash. That function is an option on the washing machine that you can initiate by pressing the button. Each press of the button increases the delay time by 1 hour for up to 19 hours...^IFV
Answered by: Ivanf
Date published: 2019-04-24

Where can we buy in the US the matching heat pump dryer (DLHC3900B)?  We’re ready to purchase a set of this washer and a matching heat pump dryer in NYC but no vendor seems to even have that unit listed in their system for purchase.  

Asked by: Red7
Regrettably, the matching LG Heat Pump Dryer, Model # DLHC3900B has not been released yet and is currently not available for purchase. We do not have a timetable yet for when it will be released or when it will be available for sale in the U.S...^IFV
Answered by: Ivanf
Date published: 2019-05-07

Can the companion dryer (DLEX3900B) to the WM3900HBA use the LG drying rack #3750EL1001A?  If not, will a drying rack be available?

Asked by: JeffTH
Hi JeffTH. Yes, the LG Drying Rack, Part # 3750EL1001A is compatible with the LG 30 Inch Smart Black Steel 7.4 cu.ft. Electric Dryer, Model # DLEX3900B...^IFV
Answered by: LGJoel
Date published: 2019-02-26

Any updates on release date? Dr E

Asked by: Dr E
Thank you for your inquiry and interest in the LG 4.5 cu.ft. Front Load Washer with TurboWash360™, Model # WM3900HBA. Regrettably, we currently do not have any updates on the release date for this washer. You can click on the 'Learn More' button on the washer's product page to open a page on which you can scroll down to "Sign Up For the Latest Updates" and fill in and submit a form so you can receive the latest information on pricing, availability, and release date for the washer...^IFV
Answered by: LGJoel
Date published: 2019-04-24

Is 4.5 Cu.ft. the only option or will there be any larger options?

Asked by: Laundryknight
Regrettably, we currently do not have any information about if the LG 4.5 cu.ft. Front Load Washer with TurboWash360™, Model # WM3900HBA will be made available in any other option or about if LG has any plans to make it available in any other options...^IFV
Answered by: LGJoel
Date published: 2019-02-19
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