Installation Guide
Tools Needed:
- Adjustable wrench
- Level
- Screwdrivers (flat and Phillips)
- Pliers
- Tape measure
- Vent duct clamps
Step-by-Step Installation
- Choose Installation Location: Select a location near plumbing, electrical, and venting 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.
- Install Venting System: Connect the dryer vent duct to the exterior vent hood using approved ducting materials.
- 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 Combo Unit: Adjust the leveling legs to ensure the 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 | WM3998HWA |
| Type | 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 LED Display |
| Energy Rating | ENERGY STAR® Certified |
| Water Consumption | 12.5 gallons per cycle |
| Power Requirements | 240V, 60Hz, 30A |
| 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: 5 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, saving space and providing complete laundry solution in one machine.
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.
Steam Technology
Steam refresh cycle removes wrinkles and odors from clothes, while steam washing helps eliminate tough stains and allergens.
Sensor Dry System
Automatically senses moisture levels and adjusts drying time accordingly, preventing over-drying and saving energy.
SmartThinQ Technology
Wi-Fi enabled for remote control via smartphone app, allowing you to monitor cycle status, download programs, and receive alerts.
TurboWash™ & TurboSteam™
Advanced washing and drying technologies that save time while maintaining excellent cleaning and drying performance.
Wash Programs
Normal
Standard wash for everyday cotton and mixed fabrics
Heavy Duty
Intensive cleaning for heavily soiled items and work clothes
Delicates
Gentle cycle for silk, lace, and delicate fabrics
Quick Wash
Fast 30-minute cycle for lightly soiled items
Sanitary
High-temperature cycle to eliminate bacteria and allergens
Steam Refresh
Removes wrinkles and odors without washing
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Unit won't start | Power issue, door not closed properly | Check power supply, ensure door is latched completely |
| Clothes not drying properly | Vent blockage, overloaded, incorrect cycle | Clean vent system, reduce load size, select appropriate cycle |
| 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 | Foreign objects in drum, unbalanced load | Check for foreign objects, redistribute load evenly |
| Error codes displayed | Various system issues detected | Refer to error code section in manual, contact service if needed |
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: Heating element issue - Contact service center
Manual Downloads
Current Model Manuals
WM3998HWA
4.5 cu. ft. Washer Dryer Combo
WM3900HWA
4.5 cu. ft. Smart Combo
WM4000HWA
4.8 cu. ft. Large Capacity Combo
WM3500CLA
Compact Washer Dryer Combo
Popular Previous Models
WM3488HW
2.3 cu. ft. Compact Combo
WM3997HWA
4.3 cu. ft. Washer Dryer Combo
WM3170CW
Smart ThinQ Combo
WM3455HW
Medium Capacity Combo