LG Inverter Washing Machine Service Manual

Technical Service & Repair Guide

Professional Edition

Safety Precautions

Required Safety Equipment:

  • Insulated tools
  • Safety gloves
  • Protective eyewear
  • Multimeter
  • Voltage tester

Service Safety Procedures

  1. Power Disconnection: Always disconnect power supply before performing any service or repair work.
  2. Capacitor Discharge: Discharge main capacitor before handling electrical components to prevent electric shock.
  3. Water Supply Shut-off: Close water supply valves before disconnecting water lines.
  4. Component Handling: Handle electronic boards with anti-static precautions to prevent damage.
  5. Testing Procedures: Use proper testing equipment and follow manufacturer's diagnostic procedures.
  6. Reassembly Verification: Ensure all components are properly reassembled and secured before testing.
  7. Final Testing: Perform comprehensive testing after repairs to verify proper operation and safety.
Warning: Only qualified technicians should perform service and repairs. Failure to follow safety procedures may result in injury or void warranty.

Disassembly Guide

Tools Required Torx screwdrivers, socket set, panel removal tools
Service Level Certified Technician Required
Estimated Time 30-90 minutes depending on repair
Difficulty Level Intermediate to Advanced

Step-by-Step Disassembly

  • Control Panel Removal: Remove top panel screws and carefully disconnect wiring harnesses
  • Front Panel Access: Remove front panel clips and disconnect door lock mechanism
  • Drum Access: Remove spring clamps and carefully extract drum assembly
  • Motor Disconnection: Disconnect motor wiring and remove mounting bolts
  • Pump Assembly: Remove drain pump cover and disconnect hoses
  • Heater Element: Access heating element through rear panel

For complete disassembly procedures, refer to the full service manual download.

Component Specifications

Direct Drive Motor

Specifications: 3-phase BLDC motor, voltage range 180-240V, maximum RPM 1400. Test procedures include resistance checks and hall sensor verification.

Control Board

Main PCB specifications: microprocessor controlled, 32-bit processor, flash memory for program storage. Diagnostic LEDs and error code display capabilities.

Drain Pump

Centrifugal pump specifications: 30W power rating, flow rate 20L/min. Testing includes current draw measurement and impeller rotation check.

Heating Element

Heater specifications: 2000W heating element, thermal cut-out protection. Resistance should measure 20-30 ohms when cold.

Door Lock Mechanism

Electronic door lock with thermal fuse and position sensor. Test continuity and mechanical operation during diagnostics.

Water Valves

Solenoid water inlet valves: dual solenoid design, 24V operation. Test coil resistance and water flow control.

Common Replacement Parts

Motor Assembly

Part number: 3820ER2001A - Complete direct drive motor assembly

Main Control Board

Part number: 6871ER2002G - Main electronic control unit

Drain Pump

Part number: 4681ER2001A - Complete drain pump assembly

Door Lock

Part number: 5220ER1003B - Electronic door lock mechanism

Heating Element

Part number: 3920ER2004C - 2000W heating element

Water Inlet Valve

Part number: 3828ER1001A - Dual solenoid water valve

Diagnostic Procedures

Error Code Description Diagnostic Procedure
PE Pressure sensor error Check water level sensor and air hose for blockages
TE Temperature sensor error Test NTC sensor resistance and wiring continuity
LE Motor hall sensor error Check motor hall sensor signals and motor wiring
FE EEPROM communication error Verify main board communication and replace if faulty
HE Heating element error Test heater resistance and thermal cut-out operation
DE Door lock error Check door lock mechanism and wiring continuity

Advanced Diagnostics

  • Motor Testing: Measure phase resistance (should be 1-3 ohms between phases)
  • Control Board Diagnostics: Use service mode to check sensor inputs and outputs
  • Water System Testing: Verify water flow and pressure sensor calibration
  • Heating System: Test heater operation and temperature rise characteristics
  • Communication Systems: Verify Wi-Fi module and display communication
  • Vibration Analysis: Check suspension system and balance ring operation

Service Downloads

Technical Service Manuals

F4V9RYP2T

9.5kg DD Service Manual

F4V5RYP2T

9.5kg Steam Service

F4V7RYP2S

9.5kg ThinQ Service

F4V9RYP2W

9.5kg White Service

Technical Bulletins

TB-2023-001

Motor Diagnostic Update

TB-2023-002

Control Board Firmware

TB-2023-003

Wi-Fi Module Service

TB-2023-004

Error Code Updates

Note: These service manuals are intended for qualified technicians only. For additional technical documentation, visit the LG Service Portal.