LG Direct Drive Washing Machine and Dryer Manual

The LG Direct Drive Washing Machine and Dryer is a high-efficiency laundry system featuring direct drive motor technology, multiple wash programs, steam functions, smart diagnosis, energy-saving modes, and advanced drying cycles. This front-loading unit offers large capacity, quiet operation, and intelligent fabric care with options for delicate, heavy-duty, quick wash, and specialized cycles. Below are key sections for safety, features, installation, operation, maintenance, and troubleshooting.

1. Features at a Glance 2. Installation 3. First-Time Setup 4. Specifications 5. Controls and Settings 6. Connecting Utilities 7. Operating Modes 8. Maintenance & Cleaning 9. Safety Features 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: Direct Drive Motor, Control Panel, LCD Display, Detergent Dispenser, Drum Light, Steam Function, Child Lock, Delay Start.

FeatureDescription
Direct Drive Motor10-year warranty, quiet operation, reduced vibration
Steam TechnologyRemoves wrinkles and allergens, reduces odors
Smart DiagnosisAutomatically diagnoses issues via sound analysis
6 Motion DD TechnologyMultiple wash motions for different fabric types
TurboWashFast cleaning with powerful water jets
Allergy CareEliminates 99.9% of allergens with steam and hot water
Wi-Fi ConnectivityRemote control and monitoring via LG ThinQ app
Energy Star CertifiedEnergy and water efficient operation
Child LockPrevents accidental program changes
Delay StartProgram start up to 19 hours later

Installation

Unpack and inspect contents. Place on level, solid floor.

  1. Remove shipping bolts: Use included wrench to remove all transit bolts.
  2. Connect water supply: Attach hot and cold water hoses to corresponding valves.
  3. Connect drain hose: Secure to standpipe or laundry sink.
  4. Level the unit: Adjust leveling feet to ensure machine is perfectly level.
  5. Plug into grounded electrical outlet.

WARNING! Machine is heavy; use two people for installation. Ensure all connections are secure and leak-free.

First-Time Setup

Power on unit; follow initial setup procedure.

  1. Run initial cleaning cycle: Use Tub Clean cycle without laundry.
  2. Set preferences: Configure language, time, and default settings.
  3. Download LG ThinQ app: For smart features and remote control.
  4. Test basic functions: Run quick wash cycle to verify operation.

CAUTION! Ensure unit is properly leveled to prevent vibration and noise during operation.

Specifications

Controls and Settings

Access functions via control knob and touch panel. Main Controls: POWER, START/PAUSE, PROGRAM SELECTION, OPTIONS.

Display: Cycle time remaining, selected program, options, error codes.

Wash Programs: Cotton, Synthetic, Delicates, Wool, Quick Wash, Heavy Duty, Tub Clean, Rinse+Spin, Spin Only. Options: Temperature, Spin Speed, Steam, Pre Wash, Extra Rinse, Delay Start. Dryer Programs: Cotton, Synthetic, Delicates, Quick Dry, Time Dry. Settings: Dry Level, Time, Cool Down, Wrinkle Care.

Connecting Utilities

Water Supply: Hot and cold water connections. Drain: Standpipe or laundry sink. Electrical: Grounded outlet.

  1. Turn off water supply before connecting hoses.
  2. Use only recommended hoses and fittings.
  3. Ensure drain hose is properly secured without kinks.
  4. Verify electrical outlet is properly grounded.

Tip: Install water leak detector for added protection.

Operating Modes

Supports various fabric types and soil levels.

  1. Load laundry: Distribute evenly in drum, do not overload.
  2. Add detergent: Use HE detergent in appropriate dispenser.
  3. Select program: Choose based on fabric type and soil level.
  4. Set options: Adjust temperature, spin speed, additional features.
  5. Start cycle: Press START/PAUSE to begin.
  6. Drying: Transfer to dryer, select appropriate dry cycle.
  7. Steam functions: Use for refresh, sanitize, or wrinkle removal.
  8. Smart functions: Control remotely via ThinQ app.

WARNING! Do not overload machine. Follow fabric care labels for best results.

Maintenance & Cleaning

Regular maintenance ensures optimal performance and longevity.

  1. Clean detergent dispenser monthly: Remove and rinse thoroughly.
  2. Run Tub Clean cycle: Monthly with affresh® tablet or vinegar.
  3. Clean door seal: Wipe regularly to prevent mold and residue.
  4. Clean lint filter: After each drying cycle.
  5. Inspect hoses: Check for leaks or wear annually.

CAUTION! Unplug before cleaning. Use only recommended cleaning products.

Safety Features

Child Lock: Prevents accidental program changes. Door Lock: Automatic during operation. Overflow Protection: Prevents water damage. Imbalance Detection: Automatically redistributes load.

Regulatory Information

UL Listed; complies with FCC Part 15. ENERGY STAR® partner. Copyright © 2024 LG Electronics; all rights reserved. For support, visit www.lg.com or contact 1-800-243-0000. Model: WM3900HWA

Troubleshooting

SymptomPossible CauseCorrective Action
Machine won't startPower/child lockCheck power connection; ensure child lock is off; close door properly.
Excessive vibrationLeveling/loadRe-level machine; redistribute load evenly; remove shipping bolts.
Water not fillingWater supply/hosesCheck water valves are open; inspect hoses for kinks; clean inlet filters.
Not drainingDrain hose/clogCheck drain hose position; clear any clogs; clean pump filter.
Error codes displayedVarious issuesRefer to error code chart in manual; use Smart Diagnosis feature.

Reset: Unplug for 1 minute, then restart.

Service: 1-800-243-0000; www.lg.com

LG Direct Drive Washing Machine and Dryer Manual © - All Rights Reserved 2025