Installation Guide
Tools Needed:
- Adjustable wrench
- Level
- Screwdrivers (flat and Phillips)
- Pliers
- Tape measure
Step-by-Step Installation
- Choose Installation Location: Select a location near necessary plumbing and electrical connections on a solid, level floor.
- Remove Shipping Materials: Remove all shipping bolts and packaging materials from the washing machine dryer combo.
- Connect Water Supply: Connect hot and cold water supply lines to the 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.
- Electrical Connection: Connect to a properly grounded 240V, 60Hz, AC only outlet. Do not use an extension cord.
- Level the Unit: Adjust the leveling legs to ensure the washer dryer is level from front to back and side to side.
- Test Run: Run the unit through a complete wash and dry cycle to check for leaks and proper operation.
Specifications
| Model Series | WM3900HWA |
| Type | Front Load Washer Dryer Combo |
| Color | White / Graphite Steel |
| Wash Capacity | 4.5 cu. ft. |
| Dry Capacity | 7.4 cu. ft. |
| Noise Level (Wash/Dry) | 55 dB / 65 dB |
| Control Type | Touch Controls with LCD Display |
| Energy Rating | ENERGY STAR® Certified |
| Water Consumption | 8,200 L/year |
| Power Requirements | 240V, 60Hz, 30A |
| Dimensions (HxWxD) | 89 x 69 x 75 cm |
| Weight | 85 kg |
| Max Spin Speed | 1300 RPM |
Warranty Information
- Full Warranty: 2 years 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
All-in-One Washer Dryer
Complete laundry solution in one unit - wash and dry clothes without transferring loads between machines.
ThinQ Smart Technology
Wi-Fi enabled for remote control via smartphone app, allowing you to monitor cycle status, download additional programs, and receive completion alerts.
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.
Sensor Dry System
Automatically senses moisture levels and adjusts drying time to prevent over-drying and save energy.
Steam Technology
Steam technology helps to remove tough stains, reduce allergens, and minimize wrinkles, leaving clothes fresh and hygienically clean.
TurboWash™ & TurboDry™
Advanced technologies that save time without compromising performance, completing full cycles efficiently.
Smart Functions
Remote Start
Start wash and dry cycles remotely using the ThinQ app
Cycle Monitoring
Monitor cycle progress and receive notifications when complete
Diagnostics
Smart diagnosis feature helps troubleshoot issues quickly
Software Updates
Receive automatic software updates for improved performance
Energy Monitoring
Track energy and water usage through the app
Voice Control
Compatible with Google Assistant and Amazon Alexa
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Unit won't start | Power issue, door not closed properly | Check power supply, ensure door is latched completely |
| Poor drying results | Overloading, lint filter clogged, incorrect program | Reduce load size, clean lint filter, select appropriate program |
| Water not draining | Drain hose clogged or kinked | Check drain hose for obstructions or kinks, clean filter |
| Leaking water | Door not sealed, overfilling, loose connections | Check door seal, ensure proper detergent amount, check connections |
| Unusual noises during drying | Foreign objects in drum, unbalanced load | Check for foreign objects, redistribute load evenly |
| Wi-Fi connection issues | Network problems, incorrect setup | Check network connection, re-run ThinQ setup process |
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: Temperature sensor error - Contact service center
Manual Downloads
Current Model Manuals
WM3900HWA
4.5 cu. ft. ThinQ Washer Dryer
WM4000HBA
5.0 cu. ft. ThinQ Combo
WM4200HWA
4.5 cu. ft. Steam Combo
WM3488HW
2.3 cu. ft. Compact Combo
Popular Previous Models
WM3997HWA
4.3 cu. ft. Washer Dryer
WM3998HBA
4.3 cu. ft. Black Combo
WM3477HWA
2.3 cu. ft. Compact Unit
WM3250HWA
4.5 cu. ft. Basic Combo