LG Dishwasher LDS4821ST Installation Manual

The LG Dishwasher LDS4821ST is a 24-inch built-in dishwasher with stainless steel tub, multiple wash cycles, adjustable racks, energy star certification, quiet operation technology, LED display, and advanced cleaning features. Below are key sections for safety, installation requirements, step-by-step installation, electrical and plumbing connections, testing, and troubleshooting.

1. Features at a Glance 2. Installation Requirements 3. Step-by-Step Installation 4. Electrical Connection 5. Plumbing Connection 6. Final Setup and Testing 7. Specifications 8. Controls and Settings 9. Maintenance 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: Stainless steel tub, adjustable upper rack, silverware basket, control panel, water inlet valve, drain hose, power cord, and installation hardware.

FeatureDescription
Stainless Steel TubDurable and resistant to stains and odors
Adjustable Upper RackFlexible loading for various dish sizes
Multiple Wash CyclesNormal, Heavy, Light, Rinse Only, and Sanitize
Quiet OperationSound insulation for minimal noise
Energy Star CertifiedEnergy and water efficient
LED DisplayEasy-to-read cycle status and settings
Stainless Steel FrontModern appearance and easy to clean
Delay StartProgram start time for convenience
Child LockPrevents accidental changes to settings
Soil SensorAutomatically adjusts wash time based on soil level

Installation Requirements

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

  1. Location: Level floor near sink, with access to electrical outlet, hot water supply, and drain.
  2. Tools: Phillips screwdriver, adjustable wrench, level, pliers, tape measure, and drill.
  3. Materials: Water supply line (3/8" compression fitting), drain hose, wire nuts, and power cord (if not included).
  4. Clearance: Minimum 24-inch width, 34-inch height, and 24-inch depth for standard installation.

WARNING! Dishwasher is heavy; use two people for handling. Ensure electrical power is turned off during installation.

Step-by-Step Installation

Follow these steps for proper installation.

  1. Remove packaging: Unbox dishwasher and remove all protective materials.
  2. Position dishwasher: Slide into cabinet opening, ensuring level placement.
  3. Attach mounting brackets: Secure to countertop or adjacent cabinets.
  4. Connect water supply: Attach water inlet hose to hot water supply valve.
  5. Connect drain hose: Route to sink drain or garbage disposal.
  6. Electrical connection: Connect power cord to dedicated circuit.
  7. Test operation: Run a test cycle to check for leaks and proper function.

CAUTION! Do not kink water supply or drain lines. Ensure all connections are tight to prevent leaks.

Electrical Connection

WARNING! Electrical work should be performed by a qualified electrician. Failure to properly ground unit may result in electrical shock.

Plumbing Connection

Proper plumbing connections are essential for optimal performance.

  1. Water Supply: Connect 3/8" compression fitting to hot water supply line.
  2. Drain Hose: Route to sink drain or garbage disposal, ensuring no kinks.
  3. Air Gap: Install if required by local plumbing codes.
  4. Leak Check: Turn on water supply and check for leaks at connections.

Tip: Use Teflon tape on threaded connections to prevent leaks.

Final Setup and Testing

After installation, complete final setup and test operation.

  1. Level dishwasher: Adjust leveling legs for stability.
  2. Secure mounting brackets: Tighten screws to countertop or cabinets.
  3. Install toe kick: Attach provided panel to front of dishwasher.
  4. Run test cycle: Select Normal cycle and run to check for leaks and proper operation.
  5. Adjust settings: Set preferences for sound, display, and cycle options.

Note: First cycle may take longer as system initializes.

Specifications

Controls and Settings

Access control panel for cycle selection and settings.

Control Panel: POWER, CYCLE SELECT (Normal, Heavy, Light, Rinse, Sanitize), OPTIONS (Delay Start, Hi-Temp Wash, Sani Rinse), START/PAUSE, and CHILD LOCK.

Cycle Options: Normal for daily use, Heavy for pots and pans, Light for lightly soiled items, Rinse Only for rinsing without detergent, Sanitize for high-temperature cleaning.

Settings: Delay Start (1-24 hours), Sound On/Off, Display Brightness, and Rinse Aid Dispenser adjustment.

Maintenance

Regular maintenance ensures optimal performance and longevity.

  1. Clean Filter: Remove and rinse filter monthly.
  2. Check Spray Arms: Ensure holes are clear of debris.
  3. Inspect Door Seal: Wipe clean and check for damage.
  4. Use Rinse Aid: Refill as needed for spot-free drying.
  5. Run Cleaning Cycle: Use dishwasher cleaner every 3-6 months.

CAUTION! Unplug dishwasher before performing any maintenance.

Regulatory Information

UL Listed: Complies with UL 749 standards. Energy Star: 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 © 2023 LG Electronics; all rights reserved.

Troubleshooting

SymptomPossible CauseCorrective Action
Dishwasher not startingPower supply/doorCheck power cord; ensure door is fully closed; reset circuit breaker.
Water not fillingWater supply/valveEnsure water supply is on; check inlet valve and filter.
Poor cleaningSpray arms/filterClean spray arms and filter; use recommended detergent.
Leaking waterHoses/door sealCheck hose connections; inspect door seal for damage.
Unusual noiseSpray arms/installationEnsure spray arms rotate freely; check for proper leveling.
Dishes not dryingRinse aid/heatingRefill rinse aid; ensure heating element is functioning.

Reset: Turn power off for 1 minute then restart.

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

LG Dishwasher LDS4821ST Installation Manual © - All Rights Reserved 2025