LG Dishwasher Installation Manual LDF7551ST

The LG LDF7551ST is a high-performance built-in dishwasher featuring QuadWash™ technology, LoDecibel™ quiet operation, TrueSteam® for sanitizing, SmartThinQ® technology for app control, adjustable racks, multiple wash cycles, and energy-efficient operation. Below are key sections for safety, features, installation, setup, operation, and troubleshooting.

1. Features at a Glance 2. Installation Requirements 3. Step-by-Step Installation 4. Specifications 5. Controls and Settings 6. Connecting Utilities 7. Operating Instructions 8. Smart Features 9. Care & Maintenance 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: Stainless steel tub, QuadWash™ spray arms, adjustable upper rack, silverware basket, control panel, water inlet valve, drain hose, power cord.

Feature	Description
QuadWash™ Technology	Four spray arms for thorough cleaning
LoDecibel™ Operation	Quiet performance at 44 dBA
TrueSteam®	Sanitizes dishes and reduces odors
SmartThinQ®	Wi-Fi enabled for app control and monitoring
Adjustable Racks	Flexible loading for various dish sizes
Multiple Wash Cycles	Heavy, Normal, Light, Rinse, Express
Energy Star® Certified	Energy and water efficient
Stainless Steel Interior	Durable and resistant to stains
Child Lock	Safety feature to prevent accidental use
Delay Start	Program start time for convenience

Installation Requirements

Before installation, verify you have the necessary tools and materials.

Electrical: 120V, 60Hz dedicated circuit, 15-amp fuse or circuit breaker
Water Supply: Hot water connection (120°F minimum)
Drain: Standpipe or garbage disposal connection
Space: Standard 24-inch cabinet opening
Tools: Level, adjustable wrench, screwdrivers, pliers

WARNING! Dishwasher must be installed by qualified technician. Ensure proper grounding and water connections to prevent damage.

Step-by-Step Installation

Follow these steps for proper installation.

Position dishwasher: Slide into cabinet opening, level using adjustable feet
Connect water supply: Attach water inlet hose to hot water supply line
Connect drain hose: Route to standpipe or garbage disposal
Electrical connection: Plug into grounded outlet or hardwire per local codes
Secure to counter: Use mounting brackets to prevent tipping
Test operation: Run initial cycle to check for leaks and proper function

CAUTION! Do not kink water lines. Ensure all connections are tight before operation.

Specifications

Model: LDF7551ST
Type: Built-in Dishwasher
Capacity: 14 place settings
Noise Level: 44 dBA
Water Consumption: 2.9 gallons per cycle (Normal)
Power Requirements: 120V, 60Hz, 10A
Dimensions (HxWxD): 33.875" x 23.875" x 24.5"
Weight: 105 lbs
Warranty: 10-year limited warranty on tub and rack

Controls and Settings

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

Display: Cycle indicators, time remaining, error codes, SmartThinQ status.

Cycle Settings: Heavy for pots/pans, Normal for everyday, Light for lightly soiled, Rinse for holding, Express for quick wash. Options: Heated Dry for spot-free drying, Sanitize for high-temp wash, Delay Start for timed operation.

Connecting Utilities

Water Supply: Connect to hot water line using supplied hose. Drain: Route to standpipe (minimum 20" height) or garbage disposal. Electrical: Plug into grounded outlet.

Turn off water supply and electrical power before connecting
Use thread seal tape on all water connections
Ensure drain hose has high loop to prevent backflow
Verify proper grounding for electrical safety

Tip: Use a bucket to catch water when disconnecting lines during installation.

Operating Instructions

Daily operation steps for optimal performance.

Load dishes: Scrape food debris, arrange items properly in racks
Add detergent: Use recommended dishwasher detergent in dispenser
Select cycle: Choose appropriate wash cycle for load type
Add options: Select heated dry, sanitize, or delay start as needed
Start cycle: Close door and press START
Unload: Wait for cycle completion, remove dishes when cool

WARNING! Do not use regular dish soap. Use only dishwasher-specific detergent to prevent suds overflow.

Smart Features

SmartThinQ® Technology: Download LG ThinQ app, connect dishwasher to Wi-Fi, monitor cycles remotely, receive notifications, download new cycles, troubleshoot issues via app.

Care & Maintenance

Monthly maintenance: Clean filter assembly, wipe door seal, run cleaning cycle with dishwasher cleaner. Quarterly: Check spray arms for clogs, inspect drain hose.

CAUTION! Unplug before maintenance. Do not use abrasive cleaners on stainless steel surfaces.

Regulatory Information

UL Listed: Complies with UL 749 standards. Energy Star® Certified: Meets EPA energy efficiency guidelines. FCC Part 15: Class B digital device. For support, visit www.lg.com or contact 1-800-243-0000. Copyright © 2024 LG Electronics.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Dishwasher won't start	Power/door	Check power supply; ensure door fully closed; reset circuit breaker.
Poor cleaning results	Spray arms/filter	Clean spray arms; check filter for debris; use proper detergent.
Water not draining	Drain hose/clog	Check drain hose for kinks; clean filter; ensure proper drain height.
Leaking water	Connections/door	Tighten water connections; check door seal; ensure level installation.
Unusual noise	Spray arms/installation	Check for obstructions in spray arms; verify unit is level.

Reset: Unplug for 1 minute or turn off circuit breaker for 30 seconds.

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