Installation Guide
Tools Needed:
- Adjustable wrench
- Level
- Screwdrivers (flat and Phillips)
- Pliers
- Tape measure
- Stacking kit
Step-by-Step Installation
- Choose Installation Location: Select a location with adequate space for the stacked unit, near plumbing and electrical connections on a solid, level floor.
- Remove Shipping Materials: Remove all shipping bolts and packaging materials from both washer and dryer units.
- Install Stacking Kit: Follow manufacturer instructions to properly install the stacking kit between washer and dryer units.
- Connect Water Supply: Connect hot and cold water supply lines to the washer's water inlet valves. Use only new hoses.
- Connect Drain Hose: Route the drain hose into a standpipe or laundry tub with a high loop to prevent backflow.
- Ventilation Setup: Install proper venting for the dryer according to local building codes.
- Electrical Connection: Connect to properly grounded 120V, 60Hz, AC only outlets. Do not use extension cords.
- Level the Unit: Adjust the leveling legs to ensure the stacked unit is level from front to back and side to side.
- Test Run: Run both washer and dryer through complete cycles to check for proper operation.
Specifications
| Model Series | WM3900HWA / DLEX3900W |
| Type | Stacked Front Load Washer & Electric Dryer |
| Color | White / Graphite Steel |
| Washer Capacity | 4.5 cu. ft. |
| Dryer Capacity | 7.4 cu. ft. |
| Noise Level (Washer) | 54 dB / 72 dB |
| Control Type | Touch Controls with LCD Display |
| Energy Rating | ENERGY STAR® Certified |
| Water Consumption | 13 gallons per cycle |
| Power Requirements | 120V, 60Hz (Washer) / 240V, 30A (Dryer) |
| Dimensions (HxWxD) | 74.5 x 27 x 30.5 inches |
| Total Weight | 205 lbs |
| Max Spin Speed | 1300 RPM |
Warranty Information
- Full Warranty: 1 year parts and labor
- Motor Warranty: 10 years on Direct Drive Motor
- Dryer Drum Warranty: 10 years
- Additional Coverage: Optional extended warranty available
For warranty service, contact LG Customer Service at 1-800-243-0000 or visit LG.com
Key Features
ThinQ Technology
Wi-Fi enabled for remote control via smartphone app, allowing you to monitor cycle status, download additional programs, and receive completion alerts for both washer and dryer.
Direct Drive Motor
LG's innovative Direct Drive motor connects directly to the drum without belts or pulleys, reducing noise and vibration while increasing reliability and efficiency.
TurboSteam™ Technology
Steam technology in both washer and dryer helps to remove tough stains, reduce allergens, and minimize wrinkles, leaving clothes fresh and hygienically clean.
Sensor Dry System
The dryer automatically senses moisture levels and adjusts drying time accordingly, preventing over-drying and saving energy.
6 Motion DD Technology
Six different wash motions can be combined to provide the optimal wash for any fabric type, from gentle handling of delicates to powerful cleaning of heavily soiled items.
Space Saving Design
Stacked configuration saves valuable floor space while providing full-size washer and dryer capacity, ideal for apartments and small laundry rooms.
Smart Features
Remote Start
Start washer or dryer cycles remotely using the ThinQ app
Cycle Monitoring
Monitor cycle progress and receive notifications when cycles complete
Diagnostics
Smart diagnostics help troubleshoot issues and schedule service if needed
Software Updates
Receive automatic software updates with new features and improvements
Energy Monitoring
Track energy and water usage through the ThinQ app
Voice Control
Compatible with Amazon Alexa and Google Assistant for voice commands
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Unit won't start | Power issue, door not closed properly, control lock activated | Check power supply, ensure door is latched completely, check control lock settings |
| Poor cleaning results | Overloading, wrong detergent, incorrect program selection | Reduce load size, use HE detergent, select appropriate program |
| Clothes not drying properly | Lint filter clogged, venting issue, overloading | Clean lint filter, check venting system, reduce load size |
| Water not draining | Drain hose clogged or kinked, pump filter blocked | Check drain hose for obstructions or kinks, clean pump filter |
| Unusual noises | Foreign objects in drum, unbalanced load, stacking kit issue | Check for foreign objects, redistribute load evenly, verify stacking kit installation |
| Vibration during operation | Unbalanced load, uneven floor, improper stacking | Redistribute load, level the unit, verify stacking kit installation |
Error Codes
- IE: Water supply issue - Check water supply and inlet valve
- OE: Drain issue - Check drain hose and pump
- FE: Flooding detected - Check for leaks and water supply
- LE: Motor issue - Contact service center
- dE: Door not closed properly - Ensure door is fully closed
- UE: Unbalanced load - Redistribute clothes and restart
- tE: Thermal issue - Check dryer venting and heating element
- PF: Power failure - Unit detected power interruption
Manual Downloads
Current Stacked Models
WM3900HWA
Stacked Washer Dryer Combo
WM4000HBA
Smart Stacked Laundry Center
WM3470HVA
Compact Stacked Unit
WM3500HWA
White Stacked System
Popular Previous Stacked Models
WM3488HS
Stacked Laundry Center
WM3077HW
Compact Stacked Unit
WM3455HW
White Stacked System
WM3170CW
Stacked Washer Dryer