Disassembly Guide
Tools Required:
- Torx screwdriver set (T10-T25)
- Phillips screwdrivers (#1, #2)
- Flathead screwdriver
- Nut drivers (7mm, 10mm)
- Multimeter
- Pliers (needle nose and slip joint)
Step-by-Step Disassembly
- Power Disconnection: Unplug the WashTower from electrical outlet and shut off water supply valves.
- Top Panel Removal: Remove rear screws and slide top panel backward to release from front clips.
- Control Panel Access: Detach control panel connectors and remove mounting screws to access main board.
- Front Panel Removal: Remove lower kick plate, disconnect door lock mechanism, and detach front panel clips.
- Drum Access: Remove bellows clamp, disconnect suspension springs, and carefully extract drum assembly.
- Motor Disconnection: Label all motor wires before disconnecting from main control board.
- Pump Assembly: Drain residual water and remove drain pump housing for inspection or replacement.
Component Specifications
| Model Series | WM3900HWA / DLE3900W |
| Type | Stacked Washer + Dryer Combo |
| Motor Type | Inverter Direct Drive |
| Motor Part Number | 6325EL2001B |
| Control Board | 6871JJ2002A (Main PCB) |
| Drain Pump | 4681EA2001T |
| Heater Element | DC47-00019A (Dryer) |
| Door Lock | 5220FR2006B |
| Thermal Fuse | DC32-00007A |
| Belt Part Number | Not Applicable (Direct Drive) |
| Weight Capacity | 4.5 cu.ft Washer / 7.4 cu.ft Dryer |
Replacement Parts Information
- LG Genuine Parts: Required for warranty repairs
- Cross-Reference: Check compatibility with WM4000/5000 series
- Availability: Most parts available through LG Parts Distributors
For parts ordering, contact LG Parts at 1-800-243-0000 or visit LG Parts Website
Diagnostic Procedures
| Symptom | Diagnostic Steps | Test Results |
|---|---|---|
| No Power | Check outlet voltage, test power cord, inspect main fuse | Verify 120V at outlet, continuity in power cord |
| Not Draining | Test drain pump, check for obstructions, inspect drain hose | Pump should show 10-30 ohms resistance |
| Not Spinning | Check motor brushes, test motor windings, inspect hall sensor | Windings should show 2-5 ohms between phases |
| Water Leakage | Inspect door seal, check water inlet valves, test pressure switch | Door seal should be pliable without cracks |
| Excessive Noise | Check drum bearings, inspect spider arm, test shock absorbers | Bearings should rotate smoothly without play |
| Error Codes Displayed | Document error code, check corresponding sensor, test wiring | Refer to error code chart for specific component tests |
Advanced Diagnostics
- Service Mode Access: Press and hold Temp + Soil for 3 seconds
- Sensor Testing: Use multimeter to verify sensor resistance values
- Board Diagnostics: Check for burned components and cold solder joints
- Motor Test Mode: Access through service menu for direct motor control
Repair Instructions
Motor Replacement
Complete guide for replacing the Direct Drive motor including torque specifications for mounting bolts and proper alignment procedures to prevent vibration issues.
Control Board Repair
Step-by-step instructions for diagnosing and replacing the main control board, including programming procedures and software updates required after replacement.
Drum Bearing Service
Detailed procedure for replacing drum bearings and seals, including special tool requirements and proper lubrication specifications for long-term reliability.
Door Lock Mechanism
Comprehensive guide for diagnosing and replacing door lock assemblies, including testing procedures and safety interlock verification.
Heater Element Replacement
Safe procedures for replacing dryer heating elements, including thermal fuse testing and proper clearance measurements for optimal performance.
Water Valve Service
Instructions for testing and replacing water inlet valves, including flow rate verification and filter screen cleaning procedures.
Common Repair Procedures
Pump Replacement
30-minute procedure for drain pump replacement including proper hose routing and leak testing
Sensor Calibration
Calibration process for moisture sensors and temperature probes to ensure accurate readings
Belt Inspection
Dryer belt tension adjustment and replacement guidelines for optimal performance
Seal Replacement
Door gasket replacement procedure with proper alignment and sealing verification
Shock Absorber Service
Suspension system maintenance and replacement for vibration control
Board Programming
Control board initialization and software loading procedures after replacement
Technical Downloads
WashTower Service Manuals
WM3900HWA
Complete Service Manual
WM4000HBA
Advanced Repair Guide
WM5000HWA
Technical Bulletin
WM3500HWA
Parts Catalog
Diagnostic Tools & Software
Service Tool v2.1
Diagnostic Software
Error Code Database
Complete Error Listing
Wiring Diagrams
Complete Schematics
Firmware Updates
Latest Software Versions