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Key Features

  • 4.2 cu. ft. Ultra Large Capacity
  • Ventless Condensing Drying
  • TurboWash® Technology
  • LG Steam Technology
  • Direct Drive Motor 10-Year Limited Warranty
  • LG SideKick™ Compatible
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.


Largest Capacity All-In-One Washer/Dryer

Enjoy the convenience of an all-in-one washer/dryer combo without giving up on capacity. The largest capacity (4.2 cu. ft.) means you have the room to get it all done.


Ventless Drying

No access to external venting? No problem. LG’s all-in-one washer/dryers use ventless condensing to dry your clothes without the need for external venting.


Fast Forward Your Wash

Give big loads the same great clean while cutting your wash time by up to 30 minutes* with LG’s enhanced TurboWash® technology.

*1. Compared to an LG front load washer without TurboWash®. Based on AHAM-HLW-1-2010 test protocol. Cotton / Normal or comparable cycle at default settings, 8 lb. loads. Excludes quick wash or comparable cycles intended for small, lightly soiled loads only.


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.


A Smarter Way to Wash

6Motion™ Technology uses up to 6 different wash motions to provide a smart cleaning experience that is gentle on clothes and maximizes washing performance.


Easily Maintain &
Keep Fresh

TubClean Cycle is designed for easy, periodic maintenance to keep your washer fresh. The cycle uses water jets and intense heat (up to 149 degrees) to sterilize the tub and help keep your high-performing washer in tip-top condition.


Warranty / Certifications




Follow the tips below to make sure your LG product will fit in the space intended.

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What People Are Saying

Rated 5 out of 5 by from Laundry Processing Unit This is the second one I have owned. Yes, I bought it a second time. The first one got left behind in a real estate transaction. Do not think of this as a Washer & Dryer. It is a "Laundry Processing Unit." This new one works better than the older model and gets things dryer. Once this unit teaches you how it want you to do laundry, you will be thrilled with it. Keep an open mind. You do not have to switch wet laundry to the dryer. You can leave and set it on delay to be finishing up when you return. When it finishes, pull clothing out one article at a time, give it three shakes and it is very dry. I would recommend this product with the caveat that you keep an open mind as it does not work like a conventional side-by-side set.
Date published: 2019-06-21
Rated 5 out of 5 by from Great Michine We love it. We needed a new washer / dryer that took up less space and this is the one. I read about this type of machine many years ago being used in Europe, so I knew something about them. My wife just found out about them one night when she was looking at washers on the internet. I checked it out and was sold. Love all the functions that this washer / dryer has, so many settings. Washer does a great job, but the dry times take a little getting used to. We're learning. Over all we love it. A lot more quite then our old washer and it uses a lot less water.
Date published: 2019-06-19
Rated 5 out of 5 by from Great big capacity machine for a small space I bought this machine after months of agonizing over the reviews. I am thrilled with my results. I have washed a set of queen sheets with additional light weight shirts and everything was dry. I have actually switched the dryer selection to damp dry. I read in a review to simply shake in article of clothing that seems damp (something about surface moisture) and the item will suddenly be dry. Well it really does work! I read to not fully load the washer for best drying results but in my household of 2, I am able to wash sheets, towels and all items of clothing for a week in only 5 loads while still separating by weight and color.
Date published: 2019-06-14
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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.

Is there an option to vent this dryer 

Asked by: Gh12345
Regrettably, there is no option to vent the LG Front Load Washer / Dryer Combo, Model # WM3997HWA...^IFV
Answered by: Ivanf
Date published: 2019-06-06

Without the sidekick does it come with a pedestal?

Asked by: Cono
Neither the LG Sidekick™ Pedestal Washer notr an LG Laundry Pedestal come with the LG Front Load Washer / Dryer Combo, Model # WM3997HWA. Both are separate purchases...^IFV
Answered by: Ivanf
Date published: 2019-05-28

Is this unit (without the sidekick) a fully ADA/ANSI 2017 accessible unit for TYPE A Residential units?

Asked by: Lorne B
Hi Lorne B. Although the LG Front Load Washer / Dryer Combo, Model # WM3997HWA does meet some of the requirements to be considered ADA compliant, it does not have ADA certification...^IFV
Answered by: Ivanf
Date published: 2019-05-01

bought a combo washer dryer wm3997hwa whats the deal with the lint?

Asked by: kevini
The Washer/Dryer Combo units do not have a lint trap as the lint flushes out through the drain line since it uses a condensing system and not a heating element. It is recommended that you sort laundry into similar loads that are washable in the same cycle. Refer to the chart on page 19 in the manual for sorting clothes. ^AC
Answered by: Amber C
Date published: 2019-01-14

I have heard through some of the reviews that users have been advised to make the drain level at almost ground level to aid with drying performance.  I read nothing about this in the manual. What do you think

Asked by: Djaytch99
Hello, we can only advise the unit be installed per the manual to ensure proper performance. Total height of the drain hose end should not exceed 96 inches (244.8 cm) from the bottom of the washer. The drain must be installed in accordance with any applicable local codes and regulations. Make sure that the water lines are not stretched, pinched, crushed, or kinked. ^AC
Answered by: Amber C
Date published: 2019-01-03

Dimensions of the shipping carton

Asked by: Bartwhistler
Hello, it is Carton (WxHxD) 29 1/2" x 42 1/4" x 31 1/4" and Weight (Product/Carton) 211 lbs/225.8 lbs. ^AC
Answered by: Amber C
Date published: 2018-12-25

How do I get wrinkles out of my clothes? I don't see any type of anti wrinkle cycle and everything I take out is wrinkled beyond a regular iron.

Asked by: Zaf8
I have found that if I use the damp dry setting and remove my clothes as soon as the drying cycle finishes that my clothes are dry enough and not wrinkled much.
Answered by: ladycheme
Date published: 2018-11-08

Where is this combo washer/dryer manufactured?

Asked by: DrKate
Hi DrKate. Regrettably, the only way to identify where the LG Front Load Washer / Dryer Combo, Model # WM3997HWA is manufactured will be to look at the carton that it is shipped in or to look at the nameplate that is attached to the unit. LG is an international company with worldwide factories. Parts for the washer may come from different factories in different countries and the washer be assembled in a different country. The nameplate will have the date of manufacture, country of manufacture/country of assembly stamped on it...^IFV
Answered by: LGJoel
Date published: 2018-09-27
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