Installation Guide
Tools Needed:
- Adjustable wrench
- Level
- Screwdrivers (flat and Phillips)
- Pliers
- Tape measure
- Gas line connector (for gas models)
Step-by-Step Installation
- Choose Installation Location: Select a location near necessary 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.
- Connect Drain Hose: Route the drain hose into a standpipe or laundry tub with a high loop to prevent backflow.
- Vent Installation: Install proper venting for dryer function according to local building codes.
- Electrical Connection: Connect to a properly grounded 120V, 60Hz, AC only outlet. Do not use an extension cord.
- 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 | WM3998HWA |
| Type | Washer Dryer Combo |
| Color | Graphite Steel / White |
| Wash Capacity | 4.5 cu. ft. |
| Dry Capacity | 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 | 8,200 L/year |
| Power Requirements | 120V, 60Hz, 15A |
| 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
- 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.
ThinQ Technology
Wi-Fi enabled for remote control via smartphone app, allowing you to monitor cycle status, download additional programs, and receive completion alerts.
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.
Sensor Dry Technology
Automatically senses moisture levels and adjusts drying time accordingly, preventing over-drying and saving energy.
Steam Technology
Steam technology helps to remove tough stains, reduce allergens, and minimize wrinkles in both wash and dry cycles.
TurboWash™
This feature saves time without compromising cleaning performance, washing a full load in just 30 minutes using powerful jet sprays.
Wash Programs
Normal
Standard wash cycle for everyday fabrics and normal soil levels
Heavy Duty
Intensive cleaning for heavily soiled items and sturdy fabrics
Delicates
Gentle cycle for delicate fabrics requiring special care
Quick Wash
Fast cycle for lightly soiled items needing quick refresh
Sanitary
High-temperature cycle to eliminate bacteria and allergens
Wrinkle Care
Reduces wrinkles through steam and gentle tumbling
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 washing results | Overloading, wrong detergent, incorrect program selection | Reduce load size, use HE detergent, select appropriate program |
| Clothes not drying properly | 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 water connections | Check door seal, ensure proper detergent amount, check connections |
| Unusual noises | Foreign objects in drum, unbalanced load, installation issues | Check for foreign objects, redistribute load evenly, verify installation |
| Error codes displayed | Various system malfunctions detected | Refer to error code section below for specific solutions |
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 heating element and connections
Maintenance Tips
Clean Lint Filter
Clean lint filter after every drying cycle to maintain efficiency and prevent fire hazards.
Check Drain Pump
Regularly inspect and clean drain pump filter to prevent clogs and drainage issues.
Clean Door Seal
Wipe door seal regularly to prevent mold and mildew buildup.
Run Cleaning Cycle
Use tub clean cycle monthly with affresher to maintain freshness.
Manual Downloads
Current Model Manuals
WM3998HWA
4.5 cu. ft. ThinQ Combo
WM3900HWA
4.5 cu. ft. Steam Combo
WM3488HW
2.3 cu. ft. Compact Combo
WM4000HWA
4.8 cu. ft. Large Capacity
Popular Previous Models
WM3997HWA
4.3 cu. ft. ThinQ Combo
WM3888HWA
4.2 cu. ft. Steam Combo
WM3477HW
2.3 cu. ft. Compact
WM3677HWA
4.2 cu. ft. Standard