Installation Guide
Tools Needed:
- Stacking kit (included)
- Adjustable wrench
- Level
- Screwdrivers (flat and Phillips)
- Pliers
- Tape measure
Step-by-Step Stacking Installation
- Prepare Location: Ensure floor is level, solid, and near plumbing/electrical connections with adequate clearance.
- Install Washer: Position washer first, level it using adjustable feet, and connect water supply lines and drain hose.
- Install Stacking Kit: Attach stacking bracket to top of washer following manufacturer instructions.
- Position Dryer: Carefully lift and place dryer onto stacking bracket, ensuring secure connection.
- Connect Venting: Install proper venting system for dryer exhaust according to local codes.
- Electrical Connection: Connect both units to properly grounded outlets. Do not use extension cords.
- Final Check: Ensure all connections are secure, units are level, and test both washer and dryer functions.
Specifications
| Model Series | WM3900HWA / DLEX3900W |
| Type | Stackable Washer & Dryer Combo |
| Color | White |
| Washer Capacity | 4.5 cu. ft. |
| Dryer Capacity | 7.4 cu. ft. |
| Noise Level (Washer) | 55 dB / 72 dB |
| Control Type | Touch Controls with LCD Display |
| Energy Rating | ENERGY STAR® Certified |
| Water Consumption | 13.5 gallons per cycle |
| Power Requirements | 120V, 60Hz (Washer) / 240V, 30A (Dryer) |
| Stacked Dimensions (HxWxD) | 78.5 x 27 x 32.5 inches |
| Weight | 205 lbs (Washer) / 125 lbs (Dryer) |
Warranty Information
- Full Warranty: 1 year parts and labor
- Motor Warranty: 10 years on Direct Drive Motor
- 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 smart features allow remote control, cycle monitoring, and smart diagnostics through the LG ThinQ app on your smartphone.
Direct Drive Motor
LG's innovative Direct Drive motor connects directly to the drum without belts, reducing noise and vibration while increasing reliability.
TurboSteam™
Steam technology in both washer and dryer helps remove tough stains, reduce allergens, and refresh clothes without washing.
Sensor Dry System
Automatically senses moisture levels and adjusts drying time to prevent over-drying and save energy.
Stackable Design
Space-saving vertical design perfect for apartments, condos, and small laundry rooms with included stacking kit.
Allergiene™ Cycle
Uses steam to remove over 95% of common household allergens from fabrics, perfect for families with allergies.
Smart ThinQ Features
Remote Start
Start and monitor laundry cycles from anywhere using your smartphone
Cycle Download
Download additional wash cycles and features via the ThinQ app
Diagnostics
Smart diagnosis feature helps troubleshoot issues through the app
Usage Monitoring
Track energy and water usage to optimize efficiency
Voice Control
Compatible with Amazon Alexa and Google Assistant for voice commands
Maintenance Alerts
Receive notifications for filter cleaning and maintenance needs
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Units won't start | Power issue, door not closed, child lock engaged | Check power supply, ensure doors are latched, check child lock settings |
| Excessive vibration | Unbalanced load, uneven stacking, floor not level | Redistribute load, check stacking installation, level the units |
| Poor drying performance | Vent blockage, overloaded, incorrect cycle | Clean vent system, reduce load size, select proper drying cycle |
| Wi-Fi connection issues | Network problems, incorrect setup | Check network connection, re-run ThinQ setup process |
| Water not draining | Drain hose clogged, pump filter blocked | Check drain hose for obstructions, clean pump filter |
| Error codes displayed | Various system faults | Refer to error code section below, contact service if persistent |
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
- tE: Temperature sensor error - Contact service center
- UE: Unbalanced load - Redistribute clothes and restart
Manual Downloads
Current Stackable Models
WM3900HWA
4.5 cu. ft. ThinQ Washer
DLFX3900W
7.4 cu. ft. ThinQ Dryer
WM4000HWA
4.5 cu. ft. Steam Washer
DLEX4000W
7.4 cu. ft. Steam Dryer
Popular Stackable Combos
WM3470HVA
4.5 cu. ft. Washer
DLFX3470V
7.3 cu. ft. Dryer
WM3600HWA
4.5 cu. ft. ThinQ Washer
DLEX3600W
7.4 cu. ft. ThinQ Dryer