Installation Guide
Tools Needed:
- Adjustable wrench
- Level
- Screwdrivers (flat and Phillips)
- Pliers
- Tape measure
- Stacking kit (included)
Step-by-Step Installation
- Choose Installation Location: Select a location with adequate space for both units, 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 Washer First: Position washer in desired location and connect water supply lines and drain hose.
- Install Stacking Kit: Attach stacking bracket to top of washing machine according to kit instructions.
- Position Dryer: Carefully lift and position dryer on top of stacking bracket, ensuring secure fit.
- Connect Ventilation: Install dryer vent hose according to local building codes and manufacturer specifications.
- Electrical Connection: Connect both units to properly grounded outlets. Do not use extension cords.
- Level the Units: Adjust leveling legs to ensure both washer and dryer are level and stable.
- Test Run: Run both units through complete cycles to check for proper operation and leaks.
Specifications
| Model Series | WM3900HWA / DLEX3900W |
| Type | Stackable Front Load Washer and 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® Most Efficient |
| Water Consumption | 13 gallons per cycle |
| Power Requirements | 120V, 60Hz (Washer) / 240V, 30A (Dryer) |
| Dimensions (Stacked HxWxD) | 125 x 27 x 32 inches |
| Weight (Combined) | 210 lbs |
| Max Spin Speed | 1300 RPM |
Warranty Information
- Full Warranty: 1 year parts and labor
- Motor Warranty: 10 years on Direct Drive Motor
- Drum Warranty: 10 years on stainless steel drum
- Additional Coverage: Optional extended warranty available
For warranty service, contact LG Customer Service at 1-800-243-0000 or visit LG.com
Key Features
LG ThinQ Technology
Smart connectivity allows remote control and monitoring via smartphone app, with cycle status updates, custom cycle creation, and energy usage tracking.
Direct Drive Motor
LG's innovative Direct Drive motor connects directly to the drum without belts, reducing noise and vibration while increasing reliability and efficiency.
TurboSteam™ Technology
Steam technology in both washer and dryer helps remove tough stains, reduce allergens, and refresh clothes without washing.
Sensor Dry System
Advanced moisture sensors automatically detect when clothes are dry and adjust drying time accordingly, preventing over-drying and saving energy.
Stackable Design
Space-saving vertical design perfect for apartments, condos, and small laundry rooms while maintaining full-size capacity.
Allergiene™ Cycle
Special cycle uses steam to remove over 95% of common household allergens like dust mites and pet dander from fabrics.
Smart Control Features
Remote Start
Start cycles remotely from your smartphone using the LG ThinQ app
Cycle Monitoring
Monitor cycle progress and receive notifications when cycles complete
Diagnostics
Smart diagnostics can identify issues and provide troubleshooting steps
Energy Monitoring
Track energy and water usage to optimize efficiency and reduce costs
Software Updates
Receive automatic software updates with new features and improvements
Voice Control
Compatible with Amazon Alexa and Google Assistant for voice commands
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Units won't start | Power issue, door not closed properly, child lock engaged | Check power supply, ensure doors are latched, disable child lock |
| Excessive vibration | Unbalanced load, uneven stacking, floor not level | Redistribute load, check stacking kit installation, level units |
| Water not draining | Drain hose clogged or kinked, pump filter blocked | Check drain hose for obstructions, clean pump filter |
| Dryer not heating | Gas supply off, thermal fuse blown, heating element failure | Check gas supply, reset thermal fuse, contact service |
| Wi-Fi connection issues | Network problems, incorrect setup, signal interference | Check network connection, re-run setup, move router closer |
| Long drying times | Lint buildup, overloading, improper venting | Clean lint filter, reduce load size, check vent 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
- tE: Temperature sensor error - Contact service center
- UE: Unbalanced load - Redistribute clothes and restart
Manual Downloads
Current Stackable Models
WM3900HWA / DLEX3900W
4.5 cu. ft. Washer + 7.4 cu. ft. Electric Dryer
WM4000HBA / DLGX4001B
4.5 cu. ft. Washer + 7.4 cu. ft. Gas Dryer
WM3400CW / DLE3400W
4.2 cu. ft. Washer + 7.3 cu. ft. Electric Dryer
WM3500CW / DLGX3501V
4.5 cu. ft. Washer + 7.4 cu. ft. Gas Dryer
Popular Previous Stackable Models
WM3070CW / DLE3000W
4.2 cu. ft. Washer + 7.3 cu. ft. Electric Dryer
WM3170CW / DLGX3171W
4.5 cu. ft. Washer + 7.4 cu. ft. Gas Dryer
WM2240CW / DLE2100W
4.0 cu. ft. Washer + 7.0 cu. ft. Electric Dryer
WM2455HW / DLE2510W
4.2 cu. ft. Washer + 7.3 cu. ft. Electric Dryer