Installation Guide
Service Tools Required:
- Multimeter
- Pressure gauge
- Torx screwdriver set
- Nut drivers
- Water pressure tester
Professional Installation Steps
- Site Preparation: Ensure proper electrical and plumbing connections are available with adequate clearance for service access.
- Remove Shipping Materials: Remove all transit bolts and protective packaging from the dishwasher unit.
- Water Connection: Connect hot water supply line using approved connectors and check for proper water pressure (20-120 psi).
- Drain Connection: Install drain hose with high loop configuration and ensure proper drainage flow.
- Electrical Connection: Connect to dedicated 120V, 15A circuit with proper grounding. Verify voltage and amperage.
- Level and Secure: Adjust leveling legs and secure dishwasher to countertop or adjacent cabinets.
- Initial Test Run: Perform diagnostic cycle to verify proper operation and check for leaks.
Technical Specifications
| Model Series | LDFN454HT / LDP681HST |
| Type | Built-in Dishwasher |
| Finish | Stainless Steel / Black Stainless |
| Place Settings | 14-16 Place Settings |
| Noise Level | 42-48 dBA |
| Control Type | Touch Controls with LED Display |
| Energy Rating | ENERGY STAR® Certified |
| Water Consumption | 2.5-3.5 Gallons per Cycle |
| Power Requirements | 120V, 60Hz, 15A |
| Dimensions (HxWxD) | 33.875 x 23.875 x 24.5 inches |
| Weight | 105 lbs |
| Drying System | Condensation Drying with Heat Exchange |
Service Warranty Information
- Limited Warranty: 1 year parts and labor
- Direct Drive Motor: 10 years on wash motor
- Stainless Tub: Lifetime limited warranty
- Service Coverage: Optional extended service plans available
For technical service support, contact LG Service Department at 1-800-243-0000 or visit LG Service Portal
System Features
QuadWash™ Technology
Four multi-directional spray arms provide complete coverage and powerful cleaning from every angle, eliminating the need for pre-rinsing.
Direct Drive Motor
LG's reliable Direct Drive motor operates quietly and efficiently with fewer moving parts, reducing service requirements and increasing longevity.
TrueSteam® Technology
Steam technology helps remove baked-on foods, sanitize dishes, and reduce water spots for superior cleaning performance and hygiene.
LoDecibel™ Operation
Advanced sound insulation and motor technology provide ultra-quiet operation as low as 42 dBA, comparable to a quiet library.
SmartThinQ® Technology
Wi-Fi connectivity enables remote monitoring, cycle customization, diagnostic alerts, and software updates via smartphone app.
EasyRack™ Plus System
Adjustable upper rack with flexible tines accommodates oversized items and provides versatile loading options for various dishware.
Cleaning Technology Explained
Normal Wash
Standard cleaning cycle for everyday dishes with balanced water and energy usage
Heavy Wash
Intensive cleaning for pots, pans, and heavily soiled items with extra wash time
Express Wash
Quick 30-minute cycle for lightly soiled dishes with reduced water consumption
Sanitary Cycle
High-temperature wash with steam to eliminate 99.9% of common bacteria
Crystal Clean
Gentle wash with lower temperature for delicate glassware and china
Smart Diagnosis
Automated system check that identifies issues and provides error code analysis
Troubleshooting
| Problem | Possible Cause | Service Solution |
|---|---|---|
| Dishwasher won't start | Power supply issue, door latch failure, control board error | Check circuit breaker, test door switch, diagnose control board |
| Poor cleaning results | Clogged spray arms, worn wash arm seals, low water pressure | Clean spray arms, replace seals, check water inlet valve |
| Water not draining | Clogged drain hose, faulty drain pump, drain motor failure | Clear drain line, test drain pump, replace drain motor if needed |
| Leaking water | Door seal damage, tub cracks, loose water connections | Replace door gasket, repair tub, tighten all connections |
| Unusual noises | Foreign objects in pump, worn wash motor bearings | Inspect pump assembly, replace wash motor if bearings worn |
| Error codes displayed | Sensor failures, control board issues, component malfunctions | Diagnose specific error code, replace faulty components |
Service Error Codes
- IE: Water inlet error - Check water supply and inlet valve operation
- OE: Drain error - Inspect drain pump and hose for obstructions
- FE: Flood error - Check for leaks and water sensor operation
- LE: Motor error - Diagnose wash motor and control board
- dE: Door error - Test door latch mechanism and switches
- HE: Heating error - Check heating element and temperature sensors
- PE: Pressure error - Test pressure switch and water level sensor
Manual Downloads
Current Model Service Manuals
LDFN454HT
Top Control Dishwasher
LDP681HST
Stainless Steel Dishwasher
LDP762HST
SmartThinQ Dishwasher
LDT780HST
PrintProof™ Dishwasher
Previous Model Service Manuals
LDFN454ST
Stainless Steel Model
LDP676VST
Stainless Interior
LDT9965BD
Black Stainless
LDS5540ST
Stainless Top Control