Installation Guide
Tools Needed:
- Adjustable wrench
- Level
- Screwdrivers (flat and Phillips)
- Pliers
- Tape measure
- Gas line connector (if gas model)
Step-by-Step Installation
- Choose Installation Location: Select a location with proper ventilation, near necessary plumbing and electrical/gas connections on a solid, level floor.
- Remove Shipping Materials: Remove all shipping bolts and packaging materials from the combo 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.
- Electrical/Gas Connection: Connect to properly grounded outlet. For gas models, ensure proper gas line connection by qualified technician.
- Ventilation Setup: Install proper venting system for dryer function according to local building codes.
- Level the Unit: Adjust the leveling legs to ensure the combo unit is level from front to back and side to side.
- Test Run: Run both wash and dry cycles to check for leaks and proper operation.
Specifications
| Model Series | WM3900HWA / WM3998HWA |
| Type | Front Load Washer Dryer Combo |
| Color | White / Graphite Steel |
| Capacity (Wash/Dry) | 4.5 cu.ft / 4.5 cu.ft |
| Noise Level (Wash/Dry) | 55 dB / 65 dB |
| Control Type | Touch Controls with LCD Display |
| Energy Rating | ENERGY STAR® Certified |
| Water Consumption | Approx. 6,500 L/year |
| Power Requirements | 120V, 60Hz (Electric) / Natural Gas (Gas Models) |
| Dimensions (HxWxD) | 74 x 27 x 30 inches |
| Weight | 185 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
All-in-One Design
Combines washing and drying functions in a single unit, perfect for small spaces and eliminating the need to transfer laundry between machines.
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.
ThinQ Technology
Wi-Fi enabled for remote control via smartphone app, allowing you to monitor cycle status, download additional programs, and receive completion alerts.
Steam Technology
Steam technology helps to remove tough stains, reduce allergens, and minimize wrinkles, leaving clothes fresh and hygienically clean.
Sensor Dry System
Automatically senses moisture levels and adjusts drying time accordingly, preventing over-drying and saving energy.
TurboWash™ & TurboSteam™
Advanced washing and drying technologies that save time without compromising performance, with quick cycles for busy lifestyles.
Smart Functions
Remote Start
Start wash or dry cycles remotely using the ThinQ app from anywhere
Cycle Monitoring
Monitor remaining time and cycle progress through smartphone notifications
Diagnostics
Smart diagnostics can identify issues and provide troubleshooting guidance
Software Updates
Receive automatic software updates with new features and improvements
Energy Monitoring
Track energy and water usage through the ThinQ application
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 completely, disable child lock |
| Poor drying results | Overloading, lint filter clogged, improper venting | Reduce load size, clean lint filter, check venting 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 connections | Check door seal, ensure proper detergent amount, check connections |
| Excessive vibration | Unbalanced load, uneven floor, shipping bolts not removed | Redistribute load, level the machine, ensure shipping bolts removed |
| Error codes displayed | Various system issues detected | Refer to error code section in manual, 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
- HE: Heater error - Check heating element and connections
Manual Downloads
Current Model Manuals
WM3900HWA
4.5 cu.ft ThinQ Combo
WM3998HWA
4.5 cu.ft Graphite Combo
WM4000HWA
4.8 cu.ft ThinQ Combo
WM3900HBA
4.5 cu.ft Black Combo
Popular Previous Models
WM3488HW
2.3 cu.ft Washer Dryer Combo
WM3997HWA
4.5 cu.ft White Combo
WM3455HW
2.3 cu.ft Compact Combo
WM3070CW
4.2 cu.ft Stackable Combo