Installation Guide
Tools Needed:
- Adjustable wrench
- Level
- Screwdrivers (flat and Phillips)
- Pliers
- Tape measure
- Vent hose clamps
Step-by-Step Installation
- Choose Installation Location: Select a location near plumbing, electrical connections, and proper ventilation on a solid, level floor.
- Remove Shipping Materials: Remove all shipping bolts and packaging materials from the washer dryer unit.
- 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.
- Install Vent System: Connect vent hose to dryer outlet and route to exterior vent opening. Ensure proper clearance.
- Electrical Connection: Connect to a properly grounded 240V, 60Hz outlet for dryer function and 120V for washer function.
- 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 both wash and dry cycles to check for leaks, proper operation, and adequate ventilation.
Specifications
| Model Series | WM3900HWA |
| Type | Front Load Washer Dryer Combo |
| Color | Graphite Steel / White |
| Washer Capacity | 4.5 cu. ft. |
| Dryer Capacity | 7.4 cu. ft. |
| Noise Level (Wash/Spin/Dry) | 52 dB / 68 dB / 65 dB |
| Control Type | Touch Controls with LCD Display |
| Energy Rating | ENERGY STAR® Certified |
| Water Consumption | 8,200 L/year |
| Power Requirements | 240V/120V, 60Hz, 30A |
| Dimensions (HxWxD) | 74 x 27 x 29 inches |
| Weight | 185 lbs |
| Max Spin Speed | 1300 RPM |
Warranty Information
- Full Warranty: 2 years parts and labor
- Motor Warranty: 10 years on Direct Drive Motor
- Dryer System Warranty: 5 years on dryer components
- 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 Design
Combines washing and drying functions in a single unit, saving space and providing complete laundry solution in one machine.
ThinQ Technology
Smart connectivity allows remote control via smartphone app, cycle monitoring, and downloadable wash programs for optimal performance.
Direct Drive Motor
LG's innovative Direct Drive motor connects directly to the drum without belts, reducing noise and vibration while increasing reliability.
Sensor Dry System
Advanced moisture sensors detect when clothes are dry and automatically shut off, preventing over-drying and saving energy.
Steam Technology
Steam refresh cycle removes wrinkles and odors from clothes, while steam washing helps eliminate tough stains and allergens.
TurboWash™ & TurboDry™
Accelerated wash and dry cycles that clean and dry full loads quickly without compromising performance or fabric care.
Smart ThinQ Features
Remote Start
Start wash and dry cycles remotely using the ThinQ app on your smartphone
Cycle Monitoring
Monitor cycle progress and receive completion alerts on your mobile device
Diagnostics
Smart diagnosis feature helps troubleshoot issues and schedule service if needed
Program Download
Download new wash programs and cycles as they become available
Energy Monitoring
Track energy and water usage through the ThinQ app for efficient laundry management
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, child lock engaged | Check power supply, ensure door is latched, disable child lock |
| Clothes not drying properly | Overloading, lint filter clogged, vent system restricted | Reduce load size, clean lint filter, check vent system |
| Water not draining | Drain hose clogged or kinked, pump filter blocked | Check drain hose for obstructions, clean pump filter |
| Leaking water | Door not sealed, overfilling, loose water connections | Check door seal, ensure proper detergent amount, check connections |
| Unusual noises during operation | Foreign objects in drum, unbalanced load, worn components | Check for foreign objects, redistribute load, contact service |
| Error codes displayed | Various system malfunctions detected | Refer to error code list 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
- UE: Unbalanced load - Redistribute clothes and restart
- tE: Temperature sensor error - Contact service center
- HE: Heater error - Check dryer heating system
Manual Downloads
Current ThinQ Washer Dryer Models
WM3900HWA
4.5 cu. ft. ThinQ Washer Dryer
WM4000HWA
4.8 cu. ft. Smart Combo
WM4200HWA
5.0 cu. ft. Steam Combo
WM3900HBA
4.5 cu. ft. Black Stainless
Popular Previous Models
WM3488HW
2.3 cu. ft. Washer Dryer
WM3997HWA
4.3 cu. ft. Smart Combo
WM3998HWA
4.5 cu. ft. Steam Combo
WM3455HW
2.3 cu. ft. Compact Combo