LG Dishwasher LDF6920ST Repair Manual

The LG Dishwasher LDF6920ST is a high-performance built-in dishwasher featuring QuadWash technology, LoDecibel quiet operation, TrueSteam for sanitization, SmartThinQ connectivity, EasyRack Plus adjustable racks, and multiple wash cycles. This repair manual covers safety procedures, troubleshooting, component replacement, and maintenance for the LDF6920ST model. Below are key sections for safety, features, troubleshooting, repair procedures, and maintenance.

1. Features at a Glance 2. Safety Precautions 3. Troubleshooting Guide 4. Specifications 5. Component Identification 6. Disassembly Procedures 7. Common Repairs 8. Error Codes 9. Maintenance Schedule 10. Regulatory Information 11. Parts List

Features at a Glance

Key components: QuadWash spray system, stainless steel tub, adjustable racks, control panel, heating element, pump assembly, and SmartThinQ module.

Feature	Description
QuadWash Technology	Four spray arms for thorough cleaning
LoDecibel Operation	Quiet performance at 44 dBA
TrueSteam	Sanitizes dishes and reduces drying time
SmartThinQ	Wi-Fi connectivity for remote monitoring
EasyRack Plus	Adjustable upper rack with folding tines
Multiple Wash Cycles	Normal, Heavy, Turbo, Express, Rinse
Soil Sensor	Automatically adjusts cycle based on soil level
Delay Start	Program start time up to 19 hours later
Child Lock	Prevents accidental operation changes
Stainless Steel Interior	Durable and resistant to stains

Safety Precautions

Always disconnect power before servicing. Follow electrical safety procedures.

Disconnect power: Unplug dishwasher or turn off circuit breaker.
Water supply: Turn off water supply valve before working on water lines.
Electrical safety: Use insulated tools; avoid water contact with electrical components.
Component handling: Allow heating element to cool before touching.

WARNING! Risk of electric shock and burns. Always verify power is disconnected before servicing.

Troubleshooting Guide

Common issues and diagnostic procedures for the LDF6920ST model.

Dishwasher won't start: Check power supply, door latch, control board.
Poor cleaning: Inspect spray arms, filter, water temperature.
Water not draining: Check drain hose, pump, drain valve.
Leaking: Inspect door seal, tub, hose connections.
Unusual noises: Check for obstructions in pump or spray arms.

CAUTION! Always disconnect power before troubleshooting electrical components.

Specifications

Model: LDF6920ST
Type: Built-in Dishwasher
Capacity: 14 place settings
Noise Level: 44 dBA
Water Consumption: 2.9 gallons per cycle (Normal wash)
Power Requirements: 120V, 60Hz, 15A
Dimensions: 33.875" H x 23.75" W x 24.5" D
Water Connection: 1/2" NPT
Drain Hose: 5/8" ID, maximum 10 feet length
Warranty: 1 year parts and labor, 10 years tub

Component Identification

Major components and their locations within the dishwasher assembly.

Front Panel: Control buttons, display, door handle, door latch mechanism.

Interior: Upper and lower racks, spray arms, filter assembly, detergent dispenser, heating element, temperature sensor. Rear: Water inlet valve, drain pump, motor assembly, control board, wiring harness.

Disassembly Procedures

Step-by-step instructions for accessing internal components.

Remove lower rack and filter assembly.
Detach kick plate and toe panel.
Remove door panel and inner door liner.
Access control panel and electronic components.
Remove tub and pump assembly.

Tip: Take photos during disassembly for reassembly reference.

Common Repairs

Detailed procedures for frequently needed repairs.

Spray arm replacement: Remove retaining clip, replace arm.
Heating element: Disconnect power, remove mounting nuts, replace element.
Door latch: Remove inner panel, disconnect wiring, replace latch assembly.
Water inlet valve: Turn off water, disconnect hoses, replace valve.
Drain pump: Remove lower access panel, disconnect hoses and wiring, replace pump.
Control board: Document wiring connections, remove mounting screws, replace board.

WARNING! Always verify part compatibility and follow torque specifications.

Error Codes

Diagnostic codes and their meanings for the LDF6920ST.

Error Code	Description	Solution
IE	Water inlet error	Check water supply, inlet valve, pressure switch
OE	Drain error	Check drain hose, pump, obstructions
FE	Water leak detected	Inspect door seal, hoses, tub for leaks
HE	Heating element error	Check heating element, temperature sensor
LE	Motor error	Inspect wash motor, wiring, control board

Maintenance Schedule

Regular maintenance procedures to ensure optimal performance.

Monthly: Clean filter assembly, inspect spray arms, check door seal. Quarterly: Run cleaning cycle with dishwasher cleaner, inspect drain hose. Annually: Check water connections, inspect electrical components.

CAUTION! Use only LG-approved cleaning products to avoid damage.

Regulatory Information

UL listed; complies with NSF/ANSI 184 for residential dishwashers. Energy Star certified. Manufactured by LG Electronics. For technical support, visit www.lg.com or contact 1-800-243-0000. Copyright © 2023 LG Electronics.

Parts List

Part Number	Description	Application
AGM73269501	Spray Arm Assembly	Upper and lower arms
6321ER2002B	Heating Element	Water heating and drying
MDS39227502	Door Latch	Door closing mechanism
4713ER1002A	Water Inlet Valve	Water supply control
6871JJ2008F	Drain Pump	Water drainage system
6871JJ3015A	Control Board	Main electronic control
MDS33394801	Filter Assembly	Food particle filtration
MDS39227501	Door Seal	Water leak prevention

Ordering: Contact LG Parts at 1-800-243-0000 or visit www.lgparts.com

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