LG Dryer DLE5977W Service Manual

The LG Dryer DLE5977W is a 7.4 cu. ft. electric dryer with advanced features including Sensor Dry technology, SteamFresh™ cycle, LoDecibel™ quiet operation, TurboSteam™ technology, and multiple drying cycles. This service manual provides comprehensive technical information for authorized service technicians, including disassembly instructions, troubleshooting guides, wiring diagrams, and replacement part information.

1. Safety Precautions 2. Product Specifications 3. Installation Requirements 4. Disassembly Instructions 5. Component Locations 6. Electrical System 7. Testing Procedures 8. Error Codes 9. Parts List 10. Wiring Diagrams 11. Troubleshooting Guide

Safety Precautions

Before servicing the LG DLE5977W dryer, observe all safety precautions to prevent injury and equipment damage.

Warning Type	Precaution
Electrical Safety	Disconnect power before servicing. Verify power is off with voltmeter.
High Voltage	Heating element operates at 240V AC. Use insulated tools.
Hot Surfaces	Allow dryer to cool completely before disassembly.
Moving Parts	Ensure drum is stationary before accessing internal components.
Gas Models	Check for gas leaks using soap solution (if applicable).
Lifting	Use proper lifting techniques; dryer weighs 125 lbs.
Static Electricity	Ground yourself before handling electronic components.
Component Testing	Follow manufacturer's specifications for all tests.

Product Specifications

Model: DLE5977W
Type: Electric Dryer
Capacity: 7.4 cubic feet
Voltage: 240V/60Hz
Amperage: 30A
Power Cord: 4-wire, NEMA 14-30R
Dimensions: 27" W × 38.5" H × 32" D
Weight: 125 lbs
Control Type: Electronic with LED display
Special Features: Sensor Dry, SteamFresh, TurboSteam
Sound Level: 65 dBA (LoDecibel operation)

Installation Requirements

Proper installation ensures optimal performance and safety.

Location: Level floor, minimum 1" clearance on sides and back, 6" clearance at rear for venting.
Electrical: Dedicated 30A circuit with proper grounding. Use 10 AWG copper wire.
Venting: 4" diameter rigid metal duct, maximum 35 feet length with two 90° elbows.
Gas Supply: N/A for electric model (check DLE5977W for gas requirements).
Leveling: Adjust leveling feet to ensure dryer is perfectly level.

WARNING! Improper installation may cause fire hazard or equipment damage. Follow all local codes.

Disassembly Instructions

Step-by-step disassembly procedure for component access.

Top Panel Removal: Insert putty knife at rear corners, release clips, lift panel.
Control Panel: Remove screws at rear, disconnect wiring harnesses.
Front Panel: Remove screws at top and bottom, disconnect door switch.
Drum Removal: Remove front panel, belt, and support rollers.
Heating Element: Access through rear panel after drum removal.
Motor Assembly: Remove mounting bolts and electrical connections.

CAUTION! Label all wires and take photos during disassembly for proper reassembly.

Component Locations

Key component identification and locations within the dryer.

Component	Location	Access Method
Control Board	Behind control panel	Remove control panel
Motor	Bottom front	Remove front and bottom panels
Heating Element	Rear cabinet	Remove rear access panel
Thermal Fuse	Exhaust duct	Remove top panel
Door Switch	Front frame	Remove front panel
Belt Switch	Motor bracket	Remove front panel
Temperature Sensor	Exhaust duct	Remove top panel
Moisture Sensor	Inside drum front	Remove front panel

Electrical System

Electrical components and specifications for testing and replacement.

Main Control Board: Part #6325ER2002A, 120V input, microprocessor controlled
Motor: 1/3 HP, 120V, thermal protected
Heating Element: 5400W, 240V, ceramic terminals
Thermal Fuse: 194°F (90°C) cutoff, non-resettable
Operating Thermostat: 135°F (57°C) cutout
High Limit Thermostat: 194°F (90°C) cutout
Door Switch: Normally open, closes when door latched
Start Switch: Momentary contact, 120V

Testing Procedures

Diagnostic procedures for common component failures.

Heating Element Test: Disconnect power, measure resistance across terminals (should be 10-15 ohms).
Thermal Fuse Test: Continuity test - should show continuity at room temperature.
Motor Test: Check windings for proper resistance (main winding: 2-5 ohms, start winding: 10-20 ohms).
Thermostat Test: Continuity at room temperature, opens at specified temperature.
Door Switch Test: Continuity when depressed, open when released.
Moisture Sensor Test: Clean bars, check for continuity changes with moisture.

NOTE: All resistance values approximate; refer to service manual for exact specifications.

Error Codes

Diagnostic error codes displayed on control panel.

Error Code	Description	Possible Causes
dE	Door Error	Door not closing properly, door switch failure
tE	Temperature Error	Thermal fuse blown, thermostat failure
tS	Thermistor Error	Temperature sensor failure, wiring issue
HE	Heating Error	Heating element failure, thermal cutoff
LE	Motor Error	Motor failure, belt switch issue
OE	Over-drying Error	Moisture sensor failure, vent blockage
FE	Filter Error	Lint filter not installed, sensor issue

Parts List

Common replacement parts with part numbers.

Heating Element: 5301EL2001B
Thermal Fuse: 5301EL1002A
Drive Motor: 6323ER1002A
Drive Belt: 6322ER1003A
Door Switch: 5301EL1006A
Main Control Board: 6325ER2002A
User Control Board: 6871EL2001C
Temperature Sensor: 5301EL1004B
Drum Support Roller: 5301EL1001C (set of 2)
Idler Pulley: 5301EL1005A

Wiring Diagrams

Reference wiring diagrams for electrical troubleshooting.

Main Power Circuit: L1 (Black) → Thermal Fuse → Heating Element → High Limit → Operating Thermostat → L2 (Red)

Motor Circuit: L1 (Black) → Door Switch → Start Switch → Motor Start Winding → Centrifugal Switch → Motor Run Winding → Neutral

Control Circuit: Transformer → Control Board → Sensors → Display → User Inputs

NOTE: Always verify actual wiring against diagram. Colors may vary by production date.

Troubleshooting Guide

Symptom	Possible Cause	Corrective Action
Dryer won't start	Power issue, door switch, start switch	Check power, test door switch, verify start switch operation
No heat	Heating element, thermal fuse, thermostat	Test heating element continuity, check thermal fuse, verify thermostat operation
Drum not turning	Drive belt, motor, idler pulley	Inspect belt for wear, test motor, check idler pulley
Overheating	Vent blockage, thermostat, high limit	Clear vent system, test thermostats, verify airflow
Error codes displayed	Sensor failure, component failure	Refer to error code chart, test indicated components
Excessive noise	Support rollers, idler pulley, foreign objects	Inspect rollers and pulley, check for objects in drum
Clothes remain damp	Moisture sensor, heating element, venting	Clean moisture sensor, test heating element, check venting
Control panel unresponsive	Control board, wiring, power supply	Test control board power, check wiring harnesses

Reset Procedure: Unplug dryer for 5 minutes to reset control board.

Service Support: LG Technical Support: 1-800-243-0000, www.lg.com