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.
- ThinQ App Setup: Download LG ThinQ app and connect your washing machine to Wi-Fi for smart features.
- Test Run: Run the washing machine through a complete cycle to check for leaks and proper operation.
Specifications
| Model Series | WM3900HWA |
| Type | Front Load Fully Automatic Washing Machine |
| Color | Graphite Steel / White |
| 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 gallons per cycle |
| Power Requirements | 120V, 60Hz, 15A |
| Dimensions (HxWxD) | 39 x 27 x 30 inches |
| Weight | 185 lbs |
| Max Spin Speed | 1300 RPM |
| Wi-Fi Connectivity | 2.4 GHz Wi-Fi |
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 Direct Drive Motor
LG's AI-powered Direct Drive motor uses artificial intelligence to detect fabric types and optimize washing motions for the best cleaning performance.
ThinQ Smart Technology
Connect to your smartphone for remote control, cycle monitoring, and smart diagnostics. Receive alerts when cycles complete and download new wash programs.
TurboWash 360°
Five powerful jets spray water from multiple directions to penetrate fabrics quickly, cleaning a full load in just 39 minutes with excellent results.
AI Fabric Care
Automatically detects fabric softness and weight to customize wash motions and water temperature for optimal fabric care and cleaning.
Steam Technology
Allergy Care cycle uses steam to remove over 95% of common household allergens. Steam also helps reduce wrinkles and refresh clothes.
Smart Diagnosis
Quickly diagnose issues using the ThinQ app. The machine can send error data directly to LG service centers for faster troubleshooting.
Smart Wash Programs
Normal
Everyday wash for mixed fabrics with moderate soil
Heavy Duty
Intensive cleaning for heavily soiled items and sturdy fabrics
Delicates
Gentle care for silk, lace, and other delicate fabrics
Quick Wash
Fast cleaning for lightly soiled items in just 15 minutes
Allergy Care
Steam cycle that reduces allergens and bacteria
Sports Wear
Special program for athletic clothing and activewear
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Washing machine won't start | Power issue, door not closed properly, Wi-Fi interference | Check power supply, ensure door is latched completely, check Wi-Fi connection |
| ThinQ app not connecting | Wi-Fi signal weak, incorrect setup, app issues | Check Wi-Fi strength, reinstall ThinQ app, reset network settings |
| Poor cleaning results | Overloading, wrong detergent, incorrect AI settings | Reduce load size, use HE detergent, check AI fabric detection |
| Water not draining | Drain hose clogged or kinked, pump filter blocked | Check drain hose for obstructions, clean pump filter |
| Unusual noises | Foreign objects in drum, unbalanced load, motor issue | Check for foreign objects, redistribute load evenly, run diagnostics |
| Steam function not working | Water supply issue, steam generator problem | Check water connection, run steam diagnostic test |
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 sensor error - Check water level sensor
Manual Downloads
Current ThinQ Models
WM3900HWA
4.5 cu.ft. ThinQ Washer
WM4000HBA
4.8 cu.ft. ThinQ Washer
WM4200HWA
5.0 cu.ft. ThinQ Washer
WM9000HVA
5.8 cu.ft. ThinQ Washer
Popular Previous Models
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