LG LDT7808 Series User Manual

LG LDT7808 Series

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DISHWASHER

SERVICE MANUAL

NOTE

For Authorized Service Technicians

CONFIDENTIAL

MODEL : LUDP8997SN / LDT7797ST / LDP6797ST /

LDP5676BD / LDT5665ST / LDF5545ST / LSDF9897**

LDT7808** / LSDT9908**





Any reproduction or duplication (including by way of email, facsimile or other electronic means),

publication, modification, copying or transmission of this Service Manual is STRICTLY PROHIBITED unless you

have obtained the prior written consent of the LG Electronics entity from which you received this Service

Manual. The material covered by prohibition includes, without limitation, any text, graphics or logos in this

Service Manual.

Copyright ⓒ 2017 LG Electronics Inc. All rights

reserved. Only for training and service purposes.

All manuals and user guides at all-guides.com

Table of Contents

Questions and Answers:

K
Kevin FitzpatrickAug 6, 2025
What to do if the LG Dishwasher displays a DRAIN ERROR?
- M
  Mark WilliamsAug 7, 2025
  If your LG Dishwasher displays a DRAIN ERROR, you can try the following: First, clean the filter assembly. Next, remove any kinks or blockages in the drain. You may also need to clean the air gap or the drain motor. Ensure the wire is properly connected. Additionally, remove the knock out plug. If these steps don't resolve the issue, the drain motor or pump casing assembly might need repair or replacement, or the controller might need replacing.
M
Michael BergerAug 16, 2025
What to do if the LG LDT7808 displays an INLET ERROR?
- K
  Kristy ConwayAug 16, 2025
  If your LG Dishwasher displays an INLET ERROR, try the following: Begin by opening the water supply tap. Check and reconnect the wire. Inspect and, if necessary, repair the inlet hose. Clean the filter of the inlet valve and verify the electric resistance of the inlet valve (23~27?). Also, check the electric resistance of the hall sensor. You may need to replace the air breaker or the controller. If the problem persists, call a plumber for service.
T
Travis HobbsAug 27, 2025
How to fix a BUBBLE ERROR on my LG LDT7808 Dishwasher?
- A
  Anthony OwensAug 27, 2025
  If your LG Dishwasher displays a BUBBLE ERROR, make sure that you only use detergents which are designed for use in dishwashers. Also, ensure that the dishwasher is level and properly installed.

LG LDT7808 Series Specifications

General

Type	Built-In
Series	LDT7808
Energy Star Certified	Yes
Child Lock	Yes
Stainless Steel Tub	Yes
Soil Sensor	Yes
Water Heater	Yes
Delay Start	Yes
Third Rack	Yes
Height	33.875 inches
Width	23.75 inches
Depth	24.5 inches

Summary

Important Safety Notice

Specifications

Features and Operation

Parts

Program Charts

How to Disassemble

Lower Cover Disassembly

Procedure for removing the lower cover of the dishwasher.

Front Cover Assembly

Steps to disassemble the front cover assembly for different models.

Control Panel Assembly

Instructions for removing the control panel and handle.

Door Liner Assembly

Steps to disassemble blower and dispenser components of the door liner.

Door Spring Replacement

Guide for replacing the door spring mechanism.

Lower Frame Removal

Steps to remove the lower frame assembly and overflow hose.

Tub Assembly

Instructions for removing racks and water guides from the tub.

Air Guide Assembly

Procedure for removing the air guide, inlet valve, and drain motor.

Main PCB Removal

Steps for safely removing the main printed circuit board.

Sump Assembly

Guide for removing sump components like motor, sensor, and thermistor.

Steam Model Sump Assembly

Specific steps for disassembling the sump in steam models.

Steam Model Door Liner Assembly

Steps for removing the steam nozzle from the door liner.

Troubleshooting Methods

Troubleshooting by Error Message

Guide to diagnosing and resolving issues based on displayed error codes.

Troubleshooting Methods (Flowcharts)

Flowcharts for diagnosing common operational problems and symptoms.

Diagnosis and Repair by Symptom

Step-by-step guides for troubleshooting specific symptoms.

Installation Instructions

Preparing Cabinet Opening

Guidelines for preparing the cabinet space for dishwasher installation.

Preparing Electrical Wiring

Instructions for safe and correct electrical wiring connections.

Preparing Water Supply Connection

Steps for connecting the dishwasher to the water supply.

Sliding Dishwasher into Cabinet

Procedures for carefully positioning the dishwasher in the cabinet.

Leveling the Appliance

Steps to ensure the dishwasher is properly leveled.

Connecting Drain Hose

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

Connecting Power

Steps for making the electrical power connection safely.

Final Check

Performing final checks after installation to ensure proper operation.

Exploded View

Wiring Diagram

Wiring Diagram Series

Schematic diagrams illustrating electrical connections for different model series.

Main PCB Layout

Detailed view of the main printed circuit board and its connectors.

Display PCB Layout

Diagram of the display printed circuit board and its connections.

MCU PCB Layout

Illustrations of the microcontroller unit PCB for different models.