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.
- 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 120V, 60Hz, AC only outlet. Do not use an extension cord.
- Level the Washing Machine: Adjust the leveling legs to ensure the washing machine is level from front to back and side to side.
- Test Run: Run the washing machine through a complete cycle to check for leaks and proper operation.
Specifications
| Model Series | WM3900HWA |
| Type | Front Load Washing Machine |
| Color | White / Graphite Steel |
| Capacity | 4.5 cu. ft. |
| Noise Level (Wash/Spin) | 52 dB / 68 dB |
| Control Type | Touch Controls with LCD Display |
| Energy Rating | ENERGY STAR® Most Efficient |
| Water Consumption | 13.7 gallons/cycle |
| Power Requirements | 120V, 60Hz, 15A |
| Dimensions (HxWxD) | 39 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
- Additional Coverage: Optional extended warranty available
For warranty service, contact LG Customer Service at 1-800-243-0000 or visit LG.com
Key Features
AI Technology
LG's AI Technology automatically detects fabric textures and load size, then selects the optimal wash cycle for the best cleaning performance.
ThinQ Technology
Wi-Fi enabled for remote control via smartphone app, allowing you to monitor cycle status, download additional programs, and receive completion alerts.
TurboWash™ 360°
This feature saves time without compromising cleaning performance, washing a full load in just 30 minutes using powerful jet sprays and optimized drum rotations.
Steam Technology
Steam technology helps to remove tough stains, reduce allergens, and minimize wrinkles, leaving clothes fresh and hygienically clean.
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.
Smart Diagnosis
Quickly diagnose issues with your washer using the LG ThinQ app, which can identify problems and provide troubleshooting solutions.
Smart Features Explained
Voice Control
Compatible with Google Assistant and Amazon Alexa for hands-free operation
Cycle Download
Download new wash cycles and features directly to your washer via the ThinQ app
Remote Start
Start and monitor wash cycles from anywhere using your smartphone
Usage Reports
Track your energy and water usage over time to optimize efficiency
Maintenance Alerts
Receive notifications when it's time to clean the filter or perform maintenance
Firmware Updates
Automatic software updates to keep your washer running with the latest features
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Washing machine won't start | Power issue, door not closed properly, Wi-Fi connection | Check power supply, ensure door is latched completely, verify ThinQ connection |
| Poor cleaning results | Overloading, wrong detergent, incorrect AI program selection | Reduce load size, use correct detergent, allow AI to detect fabric type |
| Water not draining | Drain hose clogged or kinked, pump filter blocked | Check drain hose for obstructions or kinks, clean pump filter |
| Leaking water | Door not sealed, overfilling, loose connections | Check door seal, ensure proper detergent amount, check connections |
| Unusual noises | Foreign objects in drum, unbalanced load, motor issue | Check for foreign objects, redistribute load evenly, run diagnostic |
| ThinQ app not connecting | Wi-Fi issues, app not updated, router compatibility | Check Wi-Fi signal, update ThinQ app, restart router and washer |
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 - Run diagnostic test
- PE: Pressure switch error - Check water level sensor
Smart Diagnosis Feature
Use the LG ThinQ app to run Smart Diagnosis:
- Open the LG ThinQ app on your smartphone
- Select "Smart Diagnosis" from the menu
- Follow the on-screen instructions to initiate the diagnostic test
- The app will analyze the sounds and provide specific troubleshooting steps
- If needed, the app can connect you directly with LG customer support
Manual Downloads
Current ThinQ Model Manuals
WM3900HWA
4.5 cu.ft. Smart ThinQ Washer
WM4000HBA
4.5 cu.ft. ThinQ Steam Washer
WM4200HWA
4.8 cu.ft. AI ThinQ Washer
WM9000HVA
5.2 cu.ft. Premium ThinQ Washer
Popular Previous ThinQ Models
WM3900HWA
4.5 cu.ft. Smart ThinQ Washer
WM3700HWA
4.5 cu.ft. ThinQ Washer
WM3488HW
4.2 cu.ft. ThinQ Washer
WM3170CW
4.5 cu.ft. Smart ThinQ Washer