LG DLE5977S Service Manual

The LG DLE5977S is a high-capacity electric dryer with advanced drying technologies, multiple drying cycles, steam refresh option, sensor drying system, large capacity drum, energy-efficient operation, and smart diagnostic features. This service manual provides comprehensive information for technicians including technical specifications, disassembly procedures, troubleshooting guides, and maintenance instructions.

1. Product Overview 2. Technical Specifications 3. Safety Precautions 4. Component Locations 5. Disassembly Procedures 6. Electrical System 7. Control System 8. Heating System 9. Troubleshooting Guide 10. Error Codes 11. Parts List

Product Overview

The LG DLE5977S electric dryer features a 7.4 cu. ft. capacity, multiple drying cycles, steam technology, and smart diagnostics.

Feature	Description
Capacity	7.4 cubic feet
Control Type	Electronic with LED display
Drying Cycles	12 cycles including sensor dry
Steam Function	Steam Refresh and Steam Sanitary
Heat Source	Electric 240V
Door	Reversible door design
Filter	Large lint filter with indicator
Drum Light	LED interior light
Smart Features	SmartThinQ compatible
Warranty	10-year motor warranty

Technical Specifications

Model: DLE5977S
Voltage: 240V AC, 60Hz
Amperage: 30A
Power Cord: 4-wire power cord required
Dimensions: 27" W x 29" D x 38.5" H
Weight: 125 lbs
Drum Material: Stainless steel
Heating Element: 5600W
Motor: Direct drive motor
Control Board: Main PCB with microprocessor

Safety Precautions

Before servicing, always disconnect power and follow safety procedures.

Disconnect power: Unplug dryer or disconnect at circuit breaker.
Grounding: Ensure proper grounding of all components.
High voltage: Be cautious of high voltage in control area.
Hot surfaces: Allow heating elements to cool before handling.
Sharp edges: Wear gloves when handling metal components.

WARNING! Failure to follow safety procedures may result in electric shock or injury. Always verify power is disconnected before servicing.

Component Locations

Main components include control panel, main PCB, heating element, motor, blower assembly, and sensors.

Component	Location
Main Control Board	Behind control panel
Heating Element	Rear of drum assembly
Motor	Bottom front of unit
Thermal Fuse	On blower housing
Temperature Sensors	Inside drum housing
Door Switch	Front panel near door
Start Switch	Control panel assembly

Disassembly Procedures

Step-by-step disassembly for common service procedures.

Control Panel Removal: Remove screws from top panel, lift and disconnect wiring harness.
Top Panel Removal: Remove rear screws, slide top panel forward and lift off.
Front Panel Removal: Remove screws from sides and bottom, disconnect door switch.
Drum Removal: Remove front panel, disconnect belt, slide drum forward.
Heating Element Access: Remove rear panel, disconnect wiring, remove element.

Note: Take photos during disassembly for proper reassembly.

Electrical System

Electrical system includes main power, control circuits, motor circuit, and heating circuit.

Power Supply: 240V split phase
Control Voltage: 120V for controls
Motor Circuit: Direct drive motor with start capacitor
Heating Circuit: 5600W heating element with thermal cutoffs
Sensor Circuits: Moisture sensors and temperature sensors

CAUTION! Always verify voltage with multimeter before testing circuits.

Control System

The electronic control system manages all dryer functions and diagnostics.

Component	Function
Main PCB	Central processing unit
User Interface	Touch controls and display
Temperature Sensors	Monitor drum temperature
Moisture Sensors	Detect clothing dryness
Motor Control	Regulates drum speed
Heating Control	Manages heating cycles

Heating System

The heating system consists of heating element, thermal fuses, and temperature controls.

Heating Element: 5600W coiled element with mounting brackets.
Thermal Cutoff: High-limit safety device at 194°F (90°C).
Operating Thermostat: Cycles heating element during operation.
High Limit Thermostat: Secondary safety at 221°F (105°C).

WARNING! Always replace thermal fuses when replacing heating element.

Troubleshooting Guide

Symptom	Possible Cause	Corrective Action
Dryer won't start	Power, door switch, start switch	Check power supply, test door switch, verify start switch operation
No heat	Heating element, thermal fuse	Test heating element continuity, check thermal fuses
Drum not turning	Drive belt, motor, idler pulley	Inspect belt condition, test motor, check idler pulley
Overheating	Vent blockage, thermostat	Clear vent system, test thermostats
Error codes displayed	Sensor failure, control issue	Refer to error code chart, test sensors

Error Codes

Common error codes and their meanings for diagnostic purposes.

Error Code	Description	Solution
dE	Door switch error	Check door switch and wiring
tE	Temperature sensor error	Test temperature sensors
HE	Heating error	Check heating element and thermostats
LE	Motor error	Test motor and motor control
OE	Overheating error	Clear vent obstruction

Parts List

Common replacement parts for LG DLE5977S dryer.

Heating Element: Part # 5220EL2001B
Thermal Fuse: Part # 5303EL2002A
Drive Belt: Part # 6602ER2002A
Door Switch: Part # 5308EL1002B
Main Control Board: Part # 6871EL2002A
Motor Assembly: Part # 4681EL2001N
Idler Pulley: Part # 6602ER1004A
Temperature Sensor: Part # 5306EL1002D

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