LG LDT5678 Series User Manual (English)

Questions and Answers:

L
Laura GarrettAug 10, 2025
What to do if the LG LDT5678 shows a DRAIN ERROR?
- C
  Chelsea SmithAug 10, 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).
J
joshuacampbellAug 18, 2025
What to do if the LG LDT5678 displays a LEAKAGE ERROR?
- J
  Jennifer HowardAug 18, 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).
G
garybrownAug 25, 2025
How to fix an INLET ERROR on an LG Dishwasher?
- C
  clarkcolleenAug 26, 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.
B
Brett CoxSep 1, 2025
Why does my LG Dishwasher show a BUBBLE ERROR?
- C
  Cassidy SmithSep 1, 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 LDT5678 Series Specifications

General

Brand	LG
Model	LDT5678 Series
Category	Dishwasher
Language	English

Summary

DISHWASHER SERVICE MANUAL

Important Safety Notice

Safety Precautions for Service

Outlines essential safety warnings and precautions for authorized service technicians.

Specifications

Technical Specifications

Details key technical specifications of the dishwasher, including electrical, dimensions, and performance metrics.

Features and Operation

Product Features Overview

Describes advanced features like QuadWash, Inverter Direct Drive Motor, EasyRack Plus, Hybrid Drying, and Smart ThinQ.

Dishwasher Cycles

Standard and Special Cycles

Details available cycles: Auto, Heavy, Delicate, Refresh, Normal, Turbo, Download, Machine Clean, Rinse, Express.

Cycle Options

Drying and Delay Features

Explains options like Dual Zone, Half Load, Energy Saver, High Temp, Extra Dry, Night Dry, and Delay Start.

Test Mode Operations

Check Program Operation

Describes test modes for checking load, LED lighting, and component status.

Parts Identification

Exterior and Interior Parts

Illustrates and labels exterior and interior components of the dishwasher for identification.

Program Charts

Schematic Diagrams of Programs

Provides detailed schematic diagrams of various wash programs and their sequences.

How to Disassemble Components

Lower Cover Disassembly

Step-by-step instructions for removing the lower cover, including screw removal.

Front Cover Assembly

Front Cover Removal Procedures

Details front cover removal for different model series, including cautions for harness and actuator.

Control Panel Assembly

Control Panel and Handle Removal

Instructions for removing the control panel assembly and handle for various models.

Door Liner Assembly

Blower and Dispenser Assembly Procedures

Guides for removing the blower assembly and dispenser, including using a service jig.

Lower Frame Removal

Lower Frame Component Removal

Details on removing screws, holder hook, harness holder, and overflow hose from the lower frame.

Tub Assembly

Rack Removal Procedures

Instructions for removing upper and lower racks for 2-rack and 3-rack models.

Gliding Upper Rack Procedures

Upper Rack Removal and Reassembly

Step-by-step guide for removing and reassembling the gliding upper rack.

Nozzle and Water Guide Removal

Lower Connector Assembly

Procedure for removing lower nozzle and water guides, and assembling the lower connector.

Component Removal: Air Guide, Sensor, Valve, Motor

Air Guide Assembly Removal

Instructions for removing the air guide assembly, hall sensor, inlet valve, and drain motor.

Main PCB and Fire Retardant Sheet Installation

Main PCB Removal

Steps for removing the main PCB, emphasizing careful handling.

Fire Retardant Sheet Installation

Guidance on attaching the fire retardant sheet to the safety cover.

Casing, Pump, and Hinge Assembly Removal

Casing, Pump, and Base Cover Removal

Hinge Supporter & Rail Assembly Removal

Sump & Base and Latch Replacement

Sump & Base Removal

Latch Replacement Procedure

Sump Assembly Components

Vario Motor, Soil Sensor, Thermistor Removal

Sump Assembly Details (Models 1)

Steam Model Sump Assembly

Steam Valve and Hose Removal

Steam Model Door Liner Assembly

Steam Nozzle Removal

Troubleshooting Methods

Troubleshooting by Error Message

Lists common error messages (INLET, DRAIN, LEAKAGE, BUBBLE) and their causes/remedies.

Troubleshooting by Error Message (Continued)

Common Error Codes and Solutions

Covers EXCESS, THERMAL, HEATER, MOTOR, and VARIO errors with diagnostic steps.

Troubleshooting Methods: Water Supply

Water Supply Troubleshooting Flowchart

Flowchart to diagnose water supply issues, checking connections, pressure, and filter.

Troubleshooting Methods: Water Supply (Cont.)

Water Supply Troubleshooting for Specific Models

Specific troubleshooting flowchart for water supply issues on selected LG dishwasher models.

No Power Troubleshooting

Power Supply and Connection Checks

Steps to diagnose and resolve 'No Power' issues, checking voltage, fuses, and connections.

Washing Result Issues

Troubleshooting Unsatisfactory Washing

Addresses issues like white deposits, streaks, particles, and poor cup/utensil cleaning.

Drying Result Issues

Troubleshooting Unsatisfactory Drying

Covers streaks and water drops on dishes, and general drying performance issues.

Trouble Diagnosis by Symptom

No Power Symptom Diagnosis

Diagnoses and resolves 'No Power' issues by checking connections, fuses, and power switch.

Wash Pump/Motor Operation Issues

Pump/Motor Not Running Diagnosis

Power Button Operation Issues

Power Button Auto-Off Troubleshooting

Installation Instructions

Cabinet Opening Requirements

Water and Electrical Connections

Connecting Water Supply Line

Connecting Power Supply

Sliding Dishwasher into Cabinet

Cabinet Installation Precautions

Connecting Water Supply Line and Power

Water Supply Line Connection

Power Connection Procedures

Final Installation Check

Post-Installation Checks

Installation Check Error Codes

Exploded View (Models 1)

Exploded View (Models 2)

Exploded View (Models 3)

Base Assembly - Various Models

Base Assembly Components (Models 1)

Upper Rack Assembly - Various Models

Upper Rack Components (Models 1)

Water Guide Assembly

Water Guide Components

Lower Rack Assembly - Various Models

Lower Rack Components (Models 1)

3rd Rack Assembly

3rd Rack Components

Panel Assembly - Various Models

Panel Assembly Components (Models 1)

Front Cover Assembly - Various Models

Front Cover Components (Models 1)

Door Liner Assembly - Various Models

Door Liner Components (Models 1)

Wiring Diagram

Wiring Diagram Overview

Presents wiring diagrams for various LG dishwasher series, illustrating connections.

Main PCB Layout

Main PCB Connector and Component Identification (1)

Main PCB Connector Layout (2)

Main PCB Connector Assignment for Specific Models

Display PCB Layout

Display PCB Connector and Component Identification

MCU PCB Layout (1)

MCU PCB Connector Details (Case 1)

MCU PCB Layout (2)

MCU PCB Connector Details (Case 2)

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