LG Dishwasher LDF8072ST Repair Manual

The LG Dishwasher LDF8072ST is a high-performance built-in dishwasher featuring QuadWash technology, LoDecibel quiet operation, EasyRack Plus adjustable upper rack, TurboClean cycle, SmartThinQ connectivity, and multiple wash cycles. This repair manual covers safety procedures, troubleshooting, component replacement, and maintenance for the LDF8072ST model. Below are key sections for safety, features, installation, operation, and repair procedures.

1. Features at a Glance 2. Safety Precautions 3. Installation Guidelines 4. Technical Specifications 5. Control Panel and Settings 6. Common Error Codes 7. Component Replacement 8. Maintenance Procedures 9. Troubleshooting Guide 10. Regulatory Information

Features at a Glance

Key components: QuadWash spray system, stainless steel tub, EasyRack Plus adjustable racks, control panel with LED display, wash arm assembly, filter system, drain pump, and heating element.

Feature	Description
QuadWash Technology	Four spray arms for comprehensive cleaning coverage
LoDecibel Operation	Quiet performance at 44 dBA
EasyRack Plus	Adjustable upper rack with fold-down tines
TurboClean Cycle	High-pressure wash for heavily soiled dishes
SmartThinQ	Wi-Fi connectivity for remote monitoring
Stainless Steel Tub	Durable construction with anti-microbial properties
Multiple Wash Cycles	Normal, Heavy, Light, Rinse, Sanitize options
Soil Sensor	Automatically adjusts cycle based on soil level
Heated Dry	Optional heating element for drying
Delay Start	Program start times from 1-12 hours

Safety Precautions

Before performing any repairs, ensure proper safety procedures are followed.

Disconnect power: Unplug dishwasher or turn off circuit breaker before servicing.
Water supply: Turn off water supply valve before working on water connections.
Component access: Allow unit to cool if recently operated; wear protective gloves.
Electrical safety: Use insulated tools when working with electrical components.

WARNING! Risk of electrical shock and water damage. Always disconnect power and water before servicing.

Installation Guidelines

Proper installation ensures optimal performance and safety.

Location requirements: Level floor, adequate clearance, proper electrical and plumbing connections.
Electrical connection: 120V, 60Hz, 15A dedicated circuit with proper grounding.
Water connection: 1/2" water supply line, maximum water pressure 120 psi.
Drain connection: Proper drain hose installation with high loop or air gap.
Final checks: Level unit, test for leaks, verify proper operation.

CAUTION! Ensure all connections are secure and leak-free before operation.

Technical Specifications

Model: LDF8072ST
Type: Built-in Dishwasher
Capacity: 14 place settings
Noise Level: 44 dBA
Water Consumption: 2.9 gallons per cycle (normal)
Power Requirements: 120V, 60Hz, 15A
Water Pressure: 20-120 psi
Dimensions: 33.875"H x 23.875"W x 24.5"D
Weight: 105 lbs
Wash System: QuadWash with 4 spray arms

Control Panel and Settings

Front control panel with LED display and touch controls.

Controls: POWER, CYCLE SELECTION (Normal, Heavy, Light, Rinse, Sanitize), OPTIONS (Heated Dry, Delay Start, Sani Rinse), START/PAUSE.

Settings: Cycle selection based on soil level, temperature settings (Normal 120°F, Sani 155°F), delay start programming, option selections for enhanced cleaning. SmartThinQ settings for remote monitoring and control via mobile app.

Common Error Codes

Diagnostic error codes help identify specific issues.

Error Code	Description	Possible Cause
IE	Water inlet error	Water supply issue, inlet valve failure
OE	Drain error	Drain pump failure, drain hose clog
FE	Water overflow	Float switch activation, overfilling
LE	Motor position error	Wash motor assembly issue
HE	Heating error	Heating element failure, thermostat issue
dE	Door lock error	Door latch mechanism failure

Component Replacement

Step-by-step procedures for common component replacements.

Inlet valve replacement: Disconnect power/water, remove lower panel, disconnect wires/hoses, install new valve.
Drain pump replacement: Access through lower panel, disconnect electrical and drain connections, remove mounting screws.
Heating element replacement: Remove lower rack, disconnect power, remove element mounting nuts.
Spray arm replacement: Remove lower rack, unscrew spray arm, replace with new unit.
Control panel replacement: Remove door panel, disconnect ribbon cables, transfer components.

Note: Always verify part numbers and use genuine LG replacement parts.

Maintenance Procedures

Regular maintenance ensures optimal performance and longevity.

Filter cleaning: Remove and clean filter assembly monthly.
Spray arm inspection: Check for clogs and free rotation quarterly.
Door seal cleaning: Wipe door gasket regularly to prevent leaks.
Interior cleaning: Run empty cycle with dishwasher cleaner monthly.
Drain hose inspection: Check for kinks or clogs every 6 months.

CAUTION! Unplug unit before performing any maintenance procedures.

Troubleshooting Guide

Symptom	Possible Cause	Corrective Action
Dishwasher won't start	Power supply, door latch	Check power connection, verify door closed properly
Poor cleaning results	Spray arm obstruction, filter clog	Clean spray arms, check filter assembly
Water not draining	Drain pump, drain hose	Check drain pump operation, clear drain hose
Leaking water	Door seal, hose connections	Inspect door gasket, check hose connections
Unusual noise	Spray arm, pump, foreign objects	Check for obstructions, inspect pump assembly
Error codes displayed	Component failure	Refer to error code chart for specific diagnosis

Reset: Unplug for 5 minutes or turn off circuit breaker to reset control board.

Regulatory Information

UL Listed: Complies with UL 749 standards. Energy Star Certified: Meets energy efficiency requirements. FCC Part 15: Class B digital device compliance. Copyright © 2023 LG Electronics; all rights reserved. For technical support, visit www.lg.com or contact LG Customer Service at 1-800-243-0000.