LG LDT7797 Series User Manual (English)

Questions and Answers:

E
Emily RiveraAug 6, 2025
What to do if the LG LDT7797 shows a DRAIN ERROR?
- B
  bdavisAug 6, 2025
  If your LG Dishwasher displays a DRAIN ERROR, it could be due to several reasons. First, check and clean the filter assembly. Also, inspect the drain hose for any kinks or blockages and remove them. The inner hole of the drain case might be blocked, so repair or replace the drain motor. Other potential causes include a clogged air gap (clean the air gap), a knockout plug of the garbage disposal not removed (remove the knock out plug), a locked or defective washing motor (replace the pump casing assembly), wiring issues (check and reconnect the wire), a stuck drain motor impeller (clean the drain motor), or a damaged controller (replace the controller).
R
Robert CarterAug 14, 2025
What to do if the LG LDT7797 Dishwasher displays a LEAKAGE ERROR?
- J
  Jacob DelgadoAug 14, 2025
  If your LG Dishwasher is showing a LEAKAGE ERROR, there are several potential causes. The door gasket may have come loose or fallen off, requiring replacement of the door liner assembly. The float assembly might be stuck, necessitating replacement of the floater assembly. Other possible issues include a damaged controller (replace the controller), an improperly connected seal assembly to the sump (reassemble the seal on the sump), the unit not being leveled properly (make it level), or using the wrong detergent (use dishwasher detergent).
S
Stephen KellyAug 21, 2025
How to fix an INLET ERROR on an LG LDT7797 Dishwasher?
- H
  hannah61Aug 21, 2025
  If your LG Dishwasher displays an INLET ERROR, it could be due to several reasons. Ensure the water supply tap is open. Check the wiring connection and reconnect if necessary. Inspect the inlet hose for kinks and repair if needed. Low (below 10 psi) or high (above 120 psi) water pressure can also cause this, so call a plumber for service. Clean the filter of the inlet valve if it's clogged. Check the electric resistance of the inlet valve (23~27?). Also, check and reconnect the wire. If the impeller of the air breaker is stuck, replace the air breaker. Check the electric resistance of the hall sensor. In case of damaged controller replace the controller.
A
Andrew BrightAug 28, 2025
Why does my LG LDT7797 show a BUBBLE ERROR?
- S
  Sonya MaysAug 28, 2025
  A BUBBLE ERROR on your LG Dishwasher typically indicates oversudsing, which is caused by using improper detergent. Make sure to only use detergents designed for dishwashers. Another cause could be failure to level the dishwasher, so ensure it is properly leveled.

LG LDT7797 Series Specifications

General

LoDecibel™ Operation	Yes
Display	LED
SmartDiagnosis™	Yes
NFC Tag On	No
Height Adjustable Upper Rack	Yes
Stainless Steel Tub	Yes
Number of Wash Arms	4
Energy Star Certified	Yes
ENERGY STAR® Qualified	Yes
Wash Cycles	Normal, Heavy, Rinse
Noise Level	42 dBA
Motor Type	Direct Drive
Fold Down Tines	Yes
Tub Material	Stainless Steel
Wash System	QuadWash
Drying System	Condensing

Summary

Important Safety Notice

Specifications

Features and Operation

Product Features Overview

Details on key features like QuadWash, Inverter Drive Motor, EasyRack Plus, Hybrid Drying, and Smart ThinQ.

Control Panel Functions

Power Button Operation

Explanation of how to turn the dishwasher on and off using the Power button.

Display and Indicator Functions

Details on the digital display, rinse aid icon, and Wi-Fi indicator.

Control Lock and Chime Settings

Instructions for activating Control Lock, Wi-Fi connection, and chime on/off.

Cancel and Start Functions

How to cancel a cycle and start the dishwasher operation.

Dishwasher Cycles

Cycle Descriptions

Explanation of various wash cycles: Auto, Heavy, Delicate, Refresh, Normal, Turbo, Download, Machine Clean, Rinse, Express.

Cycle Options

Option Explanations

Details on optional settings: Dual Zone, Half Load, Energy Saver, Pre-Steam, High Temp, Extra Dry, Night Dry, Delay Start.

Test Mode Operations

Parts Identification

Exterior Parts

Diagrams and labels for external dishwasher components.

Interior Parts

Diagrams and labels for internal dishwasher components.

Program Charts

Disassembly Instructions

Lower Cover Disassembly

Steps for removing the lower cover, including screw removal.

Front Cover Assembly Disassembly

Front Cover Removal and Caution

Procedure for removing the front cover with cautions for wire harness and actuator.

Control Panel Assembly Disassembly

Door Liner Assembly Disassembly

Blower Assembly Removal

Steps for removing the blower assembly, including cover and vent.

Dispenser Assembly Removal

Instructions for removing the dispenser assembly using a service jig.

Door Spring and Liner Replacement

Door Spring Replacement

Procedure for replacing the door spring, involving rope and roller.

Door Liner Replacement

Instructions for removing and replacing the door liner, with caution about door dropping.

Lower Frame Disassembly

Tub Assembly - Rack Removal

Removing Racks (2-Rack Models)

Instructions on how to slide out racks for models with a 2-rack configuration.

Removing Racks (3-Rack Models)

Instructions on how to remove all racks for models with a 3-rack configuration.

Gliding Upper Rack Procedures

Removing Gliding Upper Rack

Steps to detach and remove the gliding upper rack using a tool.

Reassembling Gliding Upper Rack

Procedure for reassembling the gliding upper rack onto its glide rails.

Nozzle and Water Guide Disassembly

Removing Nozzle and Water Guides

Steps for removing the lower nozzle and water guides from the tub bracket.

Lower Connector Assembly

Instructions for properly assembling and securing the new lower connector.

Various Component Disassembly

Air Guide Assembly Removal

Procedure for removing the air guide assembly, including nut and clamp.

Hall Sensor Disassembly

Steps to remove the hall sensor using a screwdriver.

Inlet Valve Removal

Instructions for removing the inlet valve, including screws and connector.

Drain Motor Removal

Steps for removing the drain motor, including connector and drain case.

PCB and Sheet Installation

Main PCB Removal

Instructions for removing the main PCB, emphasizing care due to its delicate nature.

Fire Retardant Sheet Installation

Guide for attaching the fire retardant sheet to the safety cover.

Casing, Pump, Hinge, and Rail Disassembly

Casing, Pump, and Base Cover Removal

Steps for removing the casing assembly, pump, and base cover.

Hinge Supporter & Rail Assembly Removal

Procedure for removing the hinge supporter and rail assembly.

Hinge Supporter and Rail Procedures

Removing Hinge Supporter

Steps to remove the hinge supporter from the base hook.

Removing Rail Assembly

Instructions for detaching and sliding out the glide rail assembly.

Reassembling Glide Rail

Procedure for properly aligning and reassembling the glide rail.

Sump, Base, and Latch Procedures

Sump and Base Removal

Instructions for removing the sump and base components, including water guide caution.

Latch Replacement

Steps for replacing the latch mechanism, with important notes on operation.

Sump Assembly Components

Vario Motor and Cam Removal

Procedure for removing the vario motor and cam assembly.

Soil Sensor Removal

Steps for removing the soil sensor.

Thermistor Removal

Instructions for removing the thermistor and O-ring.

Steam Model Sump Assembly

Steam Ball Valve Removal

Steps for removing the steam ball valve.

Steam Nozzle Hose Removal

Procedure for removing the steam nozzle hose, with caution about caps and bearings.

Steam Model Door Liner Assembly

Steam Nozzle Removal

Instructions for removing the steam nozzle and bracket.

Troubleshooting by Displayed Error Message

Inlet Error Troubleshooting

Diagnosing and resolving inlet errors related to water supply and valve issues.

Drain Error Troubleshooting

Diagnosing and resolving drain errors related to water level and drain hose.

Leakage Error Troubleshooting

Diagnosing and resolving leakage errors, including door gasket and seals.

Bubble Error Troubleshooting

Addressing bubble errors caused by excessive suds or improper leveling.

Excess Error Troubleshooting

Resolving excess water errors and automatic drain pump operation.

Thermal Error Troubleshooting

Diagnosing thermal errors related to thermistor resistance output.

Heater Error Troubleshooting

Resolving heater errors due to water temperature issues or overheating.

Motor Error Troubleshooting

Diagnosing and fixing motor errors related to abnormal operation.

Vario Error Troubleshooting

Addressing vario errors related to improper vario cam position.

Troubleshooting by Symptom

Water Supply Troubleshooting Flowchart

Step-by-step guide to diagnose water supply issues, including LQC mode checks.

AE Error Troubleshooting Checklist

Checklist for AE errors to provide more details for repair reports.

Troubleshooting - No Power

No Power Diagnosis Flowchart

Diagnostic steps for troubleshooting power issues, checking voltage and connections.

Troubleshooting - Washing Results

Washing Result Troubleshooting Flowchart

Guide to diagnose and improve washing results, addressing streaks and particles.

Troubleshooting - Drying Results

Drying Result Troubleshooting Flowchart

Steps to improve drying performance and address water drops on dishes.

Trouble Diagnosis by Symptom

No Power Diagnosis Flowchart

Diagnosing power issues by checking connections, fuse, and switches.

Wash Pump/Motor Not Running Diagnosis

Troubleshooting steps when the wash pump or motor does not run.

Power Button Auto-Off Issue Diagnosis

Steps to address issues where the power button does not automatically turn off.

Installation Instructions

Cabinet Opening Preparation

Guidelines for preparing the cabinet opening, including dimensions and warnings.

Water and Electrical Connections

Dishwasher Preparation for Installation

Removing Interior Packing Materials

Instructions for removing all packing materials from the dishwasher interior.

Lower Cover Removal for Installation

Steps to remove the lower cover as part of the installation process.

Installing Mounting Brackets

Sliding Dishwasher into Cabinet

Connecting Water Supply and Power

Connecting Water Supply Line

Detailed steps for connecting the water supply line to the dishwasher inlet valve.

Connecting Power Supply

Instructions for connecting the dishwasher to the dedicated power supply.

Drain Hose and Disposal Connections

Connecting Drain Hose

Instructions for connecting the drain hose to the disposal or waste tee.

Connecting to Disposal without Air Gap

Guidelines for connecting the drain hose to a disposal unit, avoiding siphoning.

Leveling the Dishwasher

Dishwasher Leveling Procedure

General guidance on leveling the dishwasher for proper operation.

Checking Leveling

Method to check the tub level for proper front-to-back and side-to-side alignment.

Adjusting Leveling Feet

Adjusting Front Leveling Feet

Steps for adjusting the front leveling feet using a screwdriver or wrench.

Adjusting Rear Leveling Foot

Procedure for adjusting the rear leveling foot using the center screw.

Securing the Dishwasher

Securing Dishwasher to Cabinet Opening

Options for securing the dishwasher to the countertop or cabinet frame.

Securing Dishwasher to Countertop

Instructions for securing the dishwasher to a wood countertop using brackets.

Securing Dishwasher to Cabinet Frame

Steps for securing the dishwasher to the cabinet frame using provided screws.

Final Installation Check

Installation Check Error Codes

Table of common error codes and their possible causes and solutions during installation.

Exploded View Diagrams

Exploded View - LDT/LDF/LDB Series

Exploded view diagram for specific LG dishwasher models.

Exploded View - LDP/LDT/LDPS Models

Exploded view diagram for specific LG dishwasher models.

Exploded View - LUDP/LDT/LSDF/SKSDW Models

Exploded view diagram for specific LG dishwasher models.

Tub Assembly Diagrams

Tub Assembly - LDT/LDF/LDB Models

Diagrams of the tub assembly for specific LG dishwasher models.

Tub Assembly - LDP/LDT/LDF/LDPS Models

Diagrams of the tub assembly for specific LG dishwasher models.

Tub Assembly - LUDP/LDT/LSDF/SKSDW Models

Diagrams of the tub assembly for specific LG dishwasher models.

Base Assembly Diagrams

Base Assembly - LDT/LDP/LDF/LSDF/LDB Models

Diagrams of the base assembly for specific LG dishwasher models.

Base Assembly - SKSDW/LDPS Models

Diagrams of the base assembly for specific LG dishwasher models.

Base Assembly - LUDP8997 Model

Diagram of the base assembly for the LUDP8997** model.

Base Assembly - LDT/LDP/LSDT/LDF Models

Diagrams of the base assembly for specific LG dishwasher models.

Upper Rack Assembly Diagrams

Upper Rack Assembly - LDF/LDT/LDB Models

Diagrams of the upper rack assembly for specific LG dishwasher models.

Upper Rack Assembly - LDP/LDT/LDPS Models

Diagrams of the upper rack assembly for specific LG dishwasher models.

Upper Rack Assembly - LDP6797 Model

Diagram of the upper rack assembly for the LDP6797** model.

Upper Rack Assembly - LUDP/LDT/LSDF/SKSDW Models

Diagrams of the upper rack assembly for specific LG dishwasher models.

Water Guide Assembly Diagrams

Water Guide Assembly - LDP/LSDF/LDT/SKSDW Models

Diagram of the water guide assembly for specific LG dishwasher models.

Lower Rack Assembly Diagrams

Lower Rack Assembly - LDF/LDT/LDB Models

Diagrams of the lower rack assembly for specific LG dishwasher models.

Lower Rack Assembly - LDP/LDT/LDPS Models

Diagrams of the lower rack assembly for specific LG dishwasher models.

Lower Rack Assembly - LUDP/LDT/LSDF Models

Diagrams of the lower rack assembly for specific LG dishwasher models.

Lower Rack Assembly - LDT/LDP/SKSDW Models

Diagrams of the lower rack assembly for specific LG dishwasher models.

3rd Rack Assembly Diagrams

3rd Rack Assembly - LDT/LDF/LDP Models

Diagram of the 3rd rack assembly for specific LG dishwasher models.

Panel Assembly Diagrams

Panel Assembly - LDP/LDF/LDB Models

Diagrams of the panel assembly for specific LG dishwasher models.

Panel Assembly - LDT/LSDF/LSDT/SKSDW Models

Diagrams of the panel assembly for specific LG dishwasher models.

Panel Assembly - LUDP8997 Model

Diagram of the panel assembly for the LUDP8997** model.

Front Cover Assembly Diagrams

Front Cover Assembly - LUDP/LDP/LDF/LDB Models

Diagrams of the front cover assembly for specific LG dishwasher models.

Front Cover Assembly - LDT Models

Diagrams of the front cover assembly for specific LG dishwasher models.

Front Cover Assembly - LSDF/LSDT Models

Diagrams of the front cover assembly for specific LG dishwasher models.

Front Cover Assembly - SKSDW Model

Diagram of the front cover assembly for the SKSDW24*** model.

Door Liner Assembly Diagrams

Door Liner Assembly - LDB/LDP/LUDP Models

Diagrams of the door liner assembly for specific LG dishwasher models.

Door Liner Assembly - LDP/LDPS Models

Diagrams of the door liner assembly for specific LG dishwasher models.

Door Liner Assembly - LDT Models

Diagrams of the door liner assembly for specific LG dishwasher models.

Door Liner Assembly - LDT/LSDF/LSDT/SKSDW Models

Diagrams of the door liner assembly for specific LG dishwasher models.

Sump Assembly Diagrams

Sump Assembly - LDP/SKSDW/LSDF/LDT Models

Diagrams of the sump assembly for specific LG dishwasher models.

Sump Assembly - LDP/LSDT/LDT Models

Diagrams of the sump assembly for specific LG dishwasher models.

Sump Assembly - LDT/LDP/LDF/LUDP Models

Diagrams of the sump assembly for specific LG dishwasher models.

Wiring Diagrams

Wiring Diagram - LDF/LDT/LDP/LDB Models

Wiring diagrams for specific LG dishwasher model series.

Wiring Diagram - LDP/LDT/LDPS Models

Wiring diagrams for specific LG dishwasher model series.

Wiring Diagram - LUDP/LDT Models

Wiring diagrams for specific LG dishwasher model series.

Wiring Diagram - LSDF/LDT/LSDT/SKSDW/LDP Models

Wiring diagrams for specific LG dishwasher model series.

Main PCB Diagrams

Main PCB Connector Identification (General)

Detailed identification of connectors and pins on the main PCB.

Main PCB Connector Identification (Specific Models)

Connector identification for main PCB on specific LG dishwasher models.

Display PCB Diagram

MCU PCB Diagrams

MCU PCB Diagram - Case 1 (LDT Models)

Diagram of the MCU PCB for LDT7797** and LDT5665** models.

MCU PCB Diagram - Case 2 (LSDF/LDT/LSDT/SKSDW/LDP Models)

Diagram of the MCU PCB for various LG dishwasher models.

MCU PCB Diagram - LUDP8997 Model

Appendix

Sound Insulation Sheet Installation Guide

Instructions for installing the sound insulation sheet to make the dishwasher quieter.

LG LDT7797 Series User Manual

Table of Contents

Questions and Answers:

LG LDT7797 Series Specifications

Summary

Important Safety Notice

Specifications

Features and Operation

Product Features Overview

Control Panel Functions

Power Button Operation

Display and Indicator Functions

Control Lock and Chime Settings

Cancel and Start Functions

Dishwasher Cycles

Cycle Descriptions

Cycle Options

Option Explanations

Test Mode Operations

Parts Identification

Exterior Parts

Interior Parts

Program Charts

Disassembly Instructions

Lower Cover Disassembly

Front Cover Assembly Disassembly

Front Cover Removal and Caution

Control Panel Assembly Disassembly

Door Liner Assembly Disassembly

Blower Assembly Removal

Dispenser Assembly Removal

Door Spring and Liner Replacement

Door Spring Replacement

Door Liner Replacement

Lower Frame Disassembly

Tub Assembly - Rack Removal

Removing Racks (2-Rack Models)

Removing Racks (3-Rack Models)

Gliding Upper Rack Procedures

Removing Gliding Upper Rack

Reassembling Gliding Upper Rack

Nozzle and Water Guide Disassembly

Removing Nozzle and Water Guides

Lower Connector Assembly

Various Component Disassembly

Air Guide Assembly Removal

Hall Sensor Disassembly

Inlet Valve Removal

Drain Motor Removal

PCB and Sheet Installation

Main PCB Removal

Fire Retardant Sheet Installation

Casing, Pump, Hinge, and Rail Disassembly

Casing, Pump, and Base Cover Removal

Hinge Supporter & Rail Assembly Removal

Hinge Supporter and Rail Procedures

Removing Hinge Supporter

Removing Rail Assembly

Reassembling Glide Rail

Sump, Base, and Latch Procedures

Sump and Base Removal

Latch Replacement

Sump Assembly Components

Vario Motor and Cam Removal

Soil Sensor Removal

Thermistor Removal

Steam Model Sump Assembly

Steam Ball Valve Removal

Steam Nozzle Hose Removal

Steam Model Door Liner Assembly

Steam Nozzle Removal

Troubleshooting by Displayed Error Message

Inlet Error Troubleshooting

Drain Error Troubleshooting

Leakage Error Troubleshooting

Bubble Error Troubleshooting

Excess Error Troubleshooting

Thermal Error Troubleshooting

Heater Error Troubleshooting

Motor Error Troubleshooting