LG Dishwasher LDF7811ST Service Manual

The LG Dishwasher LDF7811ST is a high-performance built-in dishwasher featuring multiple wash cycles, energy-saving options, advanced cleaning technology, stainless steel interior, quiet operation, LED display, child lock, leak protection, and smart diagnostics. 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 Procedures 8. Maintenance & Cleaning 9. Safety Features 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: Stainless steel tub, control panel, spray arms, filter system, detergent dispenser, heating element, and door latch mechanism.

Feature	Description
Wash Cycles	Heavy, Normal, Light, Rinse Only, Speed Wash
Options	Heated Dry, Sanitize, Delay Start, Child Lock
Spray System	Multi-directional spray arms for complete coverage
Filtration	Self-cleaning filter system
Energy Efficiency	ENERGY STAR certified
Noise Level	Quiet operation (below 50 dBA)
Display	LED digital display with cycle indicators
Smart Features	Smart Diagnosis technology
Capacity	14-place setting capacity
Dimensions	Standard 24-inch built-in

Installation

Unpack and inspect contents. Ensure proper location and utility connections.

Prepare opening: Ensure cabinet opening meets specified dimensions.
Connect water supply: Attach hot water line (120°F recommended).
Connect drain hose: Ensure proper height and secure connection.
Electrical connection: Connect to dedicated 120V, 15A circuit.
Level dishwasher: Adjust leveling legs for proper alignment.
Secure to cabinet: Attach mounting brackets to countertop.

WARNING! Disconnect power before installation. Ensure proper grounding.

First-Time Setup

After installation, perform initial setup and test run.

Remove shipping materials: Check interior for all protective items.
Load test dishes: Use minimal load for first cycle.
Add detergent: Use recommended dishwasher detergent.
Select Normal cycle: Run complete cycle without dishes first.
Check for leaks: Monitor all connections during first run.
Set preferences: Configure default settings as needed.

CAUTION! Do not use regular dish soap. Use only dishwasher detergent.

Specifications

Model: LDF7811ST
Type: Built-in Dishwasher
Color: Stainless Steel
Capacity: 14 Place Settings
Noise Level: 48 dBA
Water Consumption: 2.9 gallons per cycle (Normal)
Energy Consumption: 0.93 kWh per cycle (Normal)
Water Pressure: 20-120 psi
Electrical: 120V, 60Hz, 15A
Dimensions (HxWxD): 33.875" x 23.875" x 24.5"

Controls and Settings

Control Panel: POWER, CYCLE SELECTION, OPTIONS, START/PAUSE, DELAY START.

Cycle Options: Heavy, Normal, Light, Rinse Only, Speed Wash, China/Crystal

Additional Features: Heated Dry, Sanitize, Delay Start (1-24 hours), Child Lock, Half Load

Display Indicators: Cycle progress, time remaining, option status, error codes

Smart Diagnosis: Hold START for 3 seconds to activate diagnostic mode

Connecting Utilities

Water Supply: Hot water line (120°F recommended). Drain: Proper hose installation. Electrical: Dedicated circuit.

Turn off water and power before connecting.
Install water supply line with shut-off valve.
Ensure drain hose has high loop or air gap.
Verify electrical connection meets local codes.
Check for leaks after connections complete.

Tip: Use thread seal tape on all water connections.

Operating Procedures

Daily operation and cycle selection guidelines.

Loading: Scrape food debris, load dishes properly.
Detergent: Add detergent to dispenser (rinse aid if needed).
Cycle Selection: Choose appropriate cycle for load type.
Options: Select additional features as needed.
Start: Close door firmly, press START.
Unloading: Wait for cycle complete signal, unload from bottom rack first.

WARNING! Do not open door during operation. Steam may cause burns.

Maintenance & Cleaning

Regular maintenance ensures optimal performance and longevity.

Filter Cleaning: Clean filter monthly or as needed.
Spray Arms: Check for clogs monthly.
Interior Wiping: Wipe door gasket and interior monthly.
Exterior Cleaning: Clean with mild detergent and soft cloth.
Monthly Cleaning: Use dishwasher cleaner monthly.

CAUTION! Unplug unit before performing any maintenance.

Safety Features

Child Lock: Prevents accidental operation. Leak Protection: Automatic shut-off if leak detected. Thermal Protection: Prevents overheating.

Regulatory Information

UL Listed: Complies with UL 749 standards. ENERGY STAR: Meets energy efficiency guidelines. FCC Part 15: Class B digital device. Copyright © 2025 LG Electronics; all rights reserved. For support, visit www.lg.com or contact 1-800-243-0000.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Dishwasher won't start	Power/door	Check power supply; ensure door closed properly; reset circuit breaker.
Poor cleaning	Loading/detergent	Check loading; use proper detergent; clean filter; check water temperature.
Water not draining	Drain clog	Check drain hose for kinks; clean filter; check garbage disposal connection.
Leaking water	Seals/connections	Check door seal; inspect water connections; ensure proper loading.
Unusual noise	Spray arms/objects	Check for obstructions in spray arms; ensure proper rack positioning.

Reset: Turn power off for 5 minutes, then restart.

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