U.S.A. Website: http://us.lgservice.com Canadian Website: http://lg.ca
ELECTRIC & GAS DRYER SERVICE MANUAL

CAUTION

READ THIS MANUAL CAREFULLY IN ORDER TO PROPERLY DIAGNOSE PROBLEMS AND TO SAFELY PROVIDE QUALITY SERVICE ON THESE DRYERS.
MODEL : DLE8377WM/DLG8388WM DLE8377NM/DLG8388NM DLE7177WM/DLG7188WM
JAN. 2006 PRINTED IN KOREA

P/No.:3828EL3005D

IMPORTANT SAFETY NOTICE
The information in this service guide is intended for use by individuals possessing skill and experience in electrical, electronic, and mechanical appliance repair. Any attempt to repair a major appliance may result in personal injury and property damage. The manufacturer or seller cannot be responsible for the interpretation of this information, nor can it assume any liability in connection with its use.

! WARNING !

To avoid personal injury, disconnect power before servicing this product. If electrical power is required for diagnosis or test purposes, disconnect the power immediately after performing the necessary checks.
RECONNECT ALL GROUNDING DEVICES
If grounding wires, screws, straps, clips, nuts, or washers used to complete a path to ground are removed for service, they must be returned to their original position and properly fastened.
WHAT TO DO IF YOU SMELL GAS:
Do not try to light a match, or cigarette, or turn on any gas or electrical appliance. Do not touch any electrical switches. Do not use any phone in your building. Clear the room, building or area of all occupants. Immediately call your gas supplier from a neighbors phone. Follow the gas suppliers instructions carefully. If you cannot reach your gas supplier, call the fire department.

IMPORTANT

Electrostatic Discharge (ESD) Sensitive Electronics ESD problems are present everywhere. ESD may damage or weaken the electronic control assembly. The new control assembly may appear to work well after repair is finished, but failure may occur at a later date due to ESD stress.
Use an anti-static wrist strap. Connect wrist strap to green ground connection point or unpainted metal in the appliance. - OR -
Touch your finger repeatedly to a green ground connection point or unpainted metal in the appliance.
Before removing the part from its package, touch the anti-static bag to a green ground connection point or unpainted metal in the appliance. Avoid touching electronic parts or terminal contacts; handle electronic control assembly by edges only. When repackaging failed electronic control assembly in anti-static bag, observe above instructions.

CONTENTS

1. SPECIFICATIONS....4 2. FEATURES AND BENEFITS.... 6 3. INSTALLATION INSTRUCTIONS... 6 4. DRYER CYCLE PROCESS.... 13 5. COMPONENT TESTING INFORMATION...14 6. MOTOR DIAGRAM AND SCHEMATIC....17 7. CONTROL LAYOUT...18 8. WIRING DIAGRAM...19 9. DIAGNOSTIC TEST....20 9-1. TEST 1 120V AC ELECTRICAL SUPPLY..21 9-2. TEST 2 THERMISTOR TEST....22 9-3. TEST 3 MOTOR TEST...24 9-4. TEST 4 MOISTURE SENSOR...25 9-5. TEST 5 DOOR SWITCH TEST...26 9-6. TEST 6 HEATER SWITCH TEST - ELECTRIC MODEL..27 9-7. TEST 7 GAS VALVE TEST - GAS MODEL...28 9-8 TEST 8 SEMI-CONDUCTOR...29 10. CHANGE GAS SETTING (NATURAL GAS, PROPANE GAS)..30 11. DISASSEMBLY INSTRUCTIONS....32 12. EXPLODED VIEW....39 12-1. CONTROL PANEL & PLATE ASSEMBLY...39 12-2. CABINET & DOOR ASSEMBLY...40 12-3-1. DRUM & MOTOR ASSEMBLY: ELECTRIC MODEL..41 12-3-2. DRUM & MOTOR ASSEMBLY: GAS MODEL..42 13. REPLACEMENT PARTS LIST....43

SPECIFICATIONS

I Name: Electric and Gas Dryer I Power supply: Please refer to the rating label regarding detailed information. I Size: 27 X 29.9 X 38.7 (inch) I Dryer capacity: IEC 7.3 cu.ft. I Weight: 126(Ibs) Specifications are subject to change by manufacturer.

I ACCESSORIES

Dryer rack (1 each)
Stacking kit (1 each) Purchased Separately
Pedestal (1 each) Purchased Separately

See page 8

See page 6

See page 7

DLE7177WM/DLE8377WM DLG7188WM/DLG8388WM
DLE8377NM DLG8388NM Navy Blue

REMARK

Material & Finish Top Plate
Blue White Porcelain Chromate
Door Trim POWER SUPPLY MOTOR ELECTRICITY CONSUMPTION HEATER LAMP GAS VALVE CONTROL TYPE DRUM CAPACITY Weight (lbs) - Net/Gross No. of Programs No. of Dry Options No. of Temperature Controls No. of Dry Levels

Sound levels

120V/240V 60Hz (26A) 250W (4.5A) 5400W (22.5A) 15 W (125mA) 13 W (110mA) x 2 Electronic 7.3 cu.ft. 124/144
AC 120V AC 240V (ELECTRIC MODEL) AC 120V AC 120V (GAS MODEL)
High/Low/Off Available Available Available Stainless Steel Available Avaiable Avaiable 27" x 42 3/4" x 28 1/3" 29 1/2" x 44 3/4" x 30 3/4"

Sensor

Moisture Temperature
Electrode sensor Thermistor
Reversible Door Drum Dryer Rack Child Lock Interior Light Product (WxHxD) Packing (WxHxD)

FEATURES AND BENEFITS

SENSOR DRY

EST. TIME REMAINING

MID HIGH

NORMAL

NORMAL MEDIUM OFF
INSTALLATION INSTRUCTIONS
Dryer Rack Installation Instructions
Open the door. Hold the dryer rack with both hands.
Put the dryer rack into the drum
Check and be sure that the front of the rack is properly seated behind the lint filter.
Stacking Kit Installation Instructions
To ensure safe and secure installation, please observe the instructions below.

WARNING

Do not attempt this alone!
At least two people are required to lift and position the dryer on top of a washing machine! Failure to heed this warning can result in serious physical injury and damage to the appliance.
Secure the side bracket to the washer with a screw on the back of the bracket. Repeat Steps 2, 3, & 4 for the other side.

Place the dryer on top of the washer by placing the legs as shown. Be careful not to pinch fingers between the washer and dryer. Slide the dryer back against the stop on the side rail.

Stacking kit

Place the washer firmly on a stable, even and solid floor as product installation instructions describe in the owners manual. Peel the protective paper from the tape on the side bracket.
Fit the side bracket firmly to the side of the top plate by attaching the double-faced tape to the top plate as picture shown.
Insert the front rail of the stacking kit. Push the front rail back against the stops on the side brackets.
Screw both sides of the front rail to the side brackets.
Do not use a stacking kit with a gas dryer in potentially unstable conditions like a mobile home.
Pedestal Installation Instructions
For washer, dryer, and combo LG 27
Attach the double-faced tape of the bracket to the After removing the protective covering from the adhesive surface, align bent parts of the the dryer as shown so the the screw holes in brackets brackets with edge and can be in the pedestal align with thethe matching holes attached to the base and press and press pedestal with screws. the brackets against the base Attach dryer. NOTE : and the the lower side first.
Remove pedestal, installation hardware, and instructions from the shipping carton. Position the dryer on top of the pedestal. ,
for washer/ combo for dryer
Be sure to press the adhesive parts of the brackets firmly to the appliance.
Install the eight (8) screws(supplied) to attach the brackets to the pedestal.
for dryer for washer/ combo
Remove the paper from the bracket.
NOTE: That the Pedestal hardware packet may include 2 sets of side brackets. Be sure to use the brackets marked for the dryer.

7 NOTE :

Move the dryer to the desired place. The appliance and pedestal assembly must be placed on a solid and level floor for proper operation. Adjust the legs of the appliance and pedestal by turning with a wrench. Then, adjust the lock unt toward the pedestal while holding the pedestal leg using a wrench.

Electric Dryer Only

Review the following options to determine the appropriate electrical connection for your home: 4-wire receptacle (NEMA type14-30R)
Use the instructions under option 1 if your home homehas a 4-wire receptacle (NEMA type 14-30R).
4-wire connection : Direct wire
Important : Grounding through the neutral conductor is prohibited for (1) new branch-circuit installations, (2) mobile homes, and (3) recreational vehicles, and (4) areas where local codes prohibit grounding through the neutral conductor. Prepare minimum 5ft(1.52m) of length in order for dryer to be replaced.
3-wire receptacle (NEMA type10-30R)
Use the instructions under option 2 or 3 if your home has a 3-wire receptacle (NEMA type 10-30R). Use option 2 if local codes and ordinances permit the connection of a chassis ground to the neutral connector. If this is not permitted, use option 3.

5" (12.7 cm) 31/2" (8.6 cm)
First, peel 5 inch (12.7cm) of covering material from (12.7 cm) (8.6 cm) end. Make a 5 inch of ground wire bared. After cutting 11/2 inch (3.8cm) from 3 other wires. peel insulation back 1inch (2.5cm). Make ends of 3 wires a hook 1" m) shape. c.5

5"

31/2"

5 (12.7 " cm)

1" m) 5c (2.

1" (2.5

Then, put the hooked shape end of the wire under the screw of the terminal block(hooked end facing rightward) and pinch the hook together and screw tightly.

4-wire direct

3V2" ) (8.9 cm
If this type is available at your home. you will be connecting to a fused disconnect or circuit breaker box

5" (12.7 cm)

3-wire direct 3 "

(8.6 cm)

If this type is available at your home. you will be connecting to a fused 1" ) disconnect or circuit breaker m 5c box (2.
1. Connect neutral wire(white) of power cord to center terminal block screw. 2. Connect red and black wire to the left and right terminal block screws. 3. Connect ground wire(green) of power cord to external ground screw and move neutral ground wire of appliance and connect it to center screw. 4. Make sure that the strain relief screw is tightened. and be sure that all terminal block nuts are on tight and power cord is in right position.

1" (2.5 cm )

D E F C
3-wire connection : Direct wire
Important : Grounding through the neutral conductor is prohibited for (1) new branch-circuit installations, (2) mobile homes, and (3) recreational vehicles, and (4) areas where local codes prohibit grounding through the neutral conductor. Prepare minimum 5ft(1.52m) of length in order for 3 " dryer (8.6 cm) replaced. to be
Option 1: 4-wire connection with a Power supply cord.
lf your local codes or ordinances do not allow the use of a 3 wire connection, or you are installing your dryer in a mobile home, you must use a 4wire connection.
First, peel 3 1/2 inch (8.9cm) of covering material from end and bare 1 inch from the ends.

(2. 1" m) 5c

1" ) cm 2.5 (
1. Connect neutral wire(white) of power cord to center terminal block screw. 2. Connect red and black wire to the left and right terminal block screws. 3. Make sure that the strain relief screw is tightened and be sure that all terminal block nuts are on tight and power cord is in right position.
1. Connect the neutral wire (white) of the power cord to the center terminal block screw. 2. Connect the red and black wires to the left and right terminal block screws. 3. Connect the ground wire (green) of the power cord to the external ground screw. Remove the neutral ground wire of appliance and connect it to center screw.

4. Make sure that the strain relief screw is tightened and that all terminal block nuts are tight and the power cord is in the right position.
Option 2: 3-Wire Connection with a Power Supply Cord
lf your local codes or ordinances permit the connection of a frame-grounding conductor to the neutral wire, use these instructions. If your local codes or ordinances do not allow the connection of a frame-grounding conductor to the neutral wire, use the instructions under Section 3: Optional 3-wire connection.
Option 3: Optional 3-wire connection.
If your local codes or ordinances do not allow the connection of a frame-grounding conductor to the neutral wire, use the instructions under this section.
1. Connect the neutral (white or center) wire (B) to the center, silver colored, screw (A) and tighten securely. 2. Connect the other two power cord wires (red and black) to the left and right terminal block screws and tighten securely. 3. Tighten the strain relief screws (C) securely.
1. Remove the appliance ground wire (D) (green) fromthe external ground connector screw and reconnect it, together with the center, white, neutral wire (E) to the center, silver colored, terminal block screw. 2. Connect the other two power cord wires (red and black) to the left and right terminal block screws and tighten securely. 3. Tighten the strain relief screws securely. 4. Connect an independent ground wire (F) from the external ground connector screw to a proper ground. (The ground wire must be long enough to allow the appliance to be moved, if necessary, for service or cleaning.)
3-2. Connect Gas Supply Pipe (Gas Dryer ONLY)
For further assistance, refer to section on Gas Requirements.
1. Make certain your dryer is equipped for use with the type of gas in your laundry room. Dryer is equipped at the factory for Natural Gas with a 3/8 N.P.T. gas connection. 2. Remove the shipping cap from the gas connection at the rear of the dryer. Make sure you do not damage the pipe thread when removing the cap. 3. Connect to gas supply pipe using a new flexible stainless steel connector. 4. Tighten all connections securely. Turn on gas and check all pipe connections (internal & external) for gas leaks with a non-corrosive leak detection fluid. 5. For L.P. (Liquefied Petroleum) gas connection, refer to section on Gas Requirements.

1 New Stainless Steel Flexible Connector - Use only if allowed by local codes (Use Design A.G.A. Certified Connector) 2 1/8 N.P.T. Pipe Plug (for checking inlet gas pressure) 3 Equipment Shut-Off Valve-Installed within 6 (1.8 m) of dryer
4 Black Iron Pipe Shorter than 20 (6.1 m) - Use 3/8 pipe Longer than 20 (6.1 m) - Use 1/2 pipe 5 3/8 N.P.T. Gas Connection

DRYER CYCLE PROCESS

Default Cycle Conditions of operation and termination Drying Cooling Wrinkle care Time
Temp- Dry Display erature Level time Electro- Temp- Default Tempsensor Control time Control**
HIGH (Normal) 54min Saturation 684C (5min) 475C MID (Normal) 55min Saturation 664C (5min) 475C HIGH MEDIUM (Normal) 41min Saturation 604C (5min) 475C
HEAVY DUTY COTTON/ TOWELS NORMAL PERM PRESS DELICATES ULTRA DELICATE SPEED DRY

Sensor Dry *

3Hr LOW LOW (Normal) 36min Saturation 523C (5min) 475C (Normal) 32min Saturation 523C (5min) 385C
ULTRA (Normal) 34min Saturation 453C (5min) 385C LOW (HIGH) (MID HIGH) 25min Saturation (705C) (5min) (475C) 20min 30min Saturation (665C) (5min) (475C) Saturation No heater N/A N/A Off Time: 6min 3Hr

Manual FRESHEN UP Dry **

AIR DRY

On Time: 10sec

Temperature Control for each cycle

Heater

* Sensor dry : Dry Level is set by users. ** Manual dry : Temperature control is set by users. Default settings can be adjusted by users.
COMPONENT TESTING INFORMATION
CAUTION When checking the Component, be sure to turn the power off, and do voltage discharge sufficiently.
Component Test Procedure Check result Remark

1. Thermal cut off

Check Top Marking: N130 2. Hi limit Thermostat (Auto reset)
Heater caseMeasure resistance of terminal If thermal fuse is open must Safety to terminal be replaced 12F Electric type Open at 266 Resistance value (130 7C) Auto reset 31F (35C) Continuity (250F ) < 1 Same shape as Outlet Thermostat. Measure resistance of terminal to terminal Open at 257 9F (125 5C) Close at 221 9F (105 5C) Measure resistance of terminal to terminal Open at 185 9F (85 5C) Close at 149 9F (65 5C) Same shape as Thermal cut off. Measure resistance of terminal to terminal Heater case Hi limit Electric type

Resistance value

Resistance value < 5 Blow housing Safety Electric type
3. Outlet Thermostat ( Auto reset)

Resistance value < 5

Check Top Marking: N85 4. Lamp holder
Resistance value: 80 ~ 100

5. Door switch

Measure resistance of the following terminal 1) Door switch knob: open Terminal: COM - NC (1-3) Terminal: COM - NO (1-2) 2) Door switch push: push Terminal: COM - NC (1-3) Terminal: COM - NO (1-2) Measure resistance of the following terminal: COM - NC
Resistance value < 1 Resistance value Resistance value Resistance value < 1 1. lever open Resistance value < 1 2. Lever push (close) Resistance value
The state that Knob is pressed is opposite to Open condition.

6. Idler switch

Component

7. Heater

Test Procedure
Measure resistance of the following terminal Terminal: 1 (COM) - 2 Terminal: 1 (COM) - 3 Terminal: 2 - 3 Measure resistance of terminal to terminal Temperature condition: 58F ~ (10~40C) 58F ~ 104F (10~40C)

Check result

Remark

Electric type

Resistance value: 10 Resistance value: 10 Resistance value: 20 Resistance value: 10 Heater case Hi limit Electric type

8. Thermistor

9. Motor

See Page 13

10. Gas valve

valve 1

Measure resistance of the following terminal Valve 1 terminal Valve 2 terminal
Gas type Resistance value: > 1.5 k Resistance value: > 1.5~2.5 k

valve 2

11. Igniter
Measure resistance of terminal to terminal
Resistance value: 100~800

Gas type

12. Frame Detect
Measure resistance of terminal to terminal Open at 370F ((Maximum) Close at 320F
Gas type Resistance value Resistance value < 1
13. Outlet Thermostat (Auto reset)
Measure resistance of terminal to terminal Open at 203 7F (95 5C) Close at 158 9F (70 5C)

Gas type Gas funnel

Resistance value Continuity < 1
Check Top Marking: N95 14. Outlet Thermostat (Manual reset) Measure resistance of terminal to terminal Open at 212 12F (100 7C) Manual reset If thermal fuse is open must be replaced Resistance value Continuity < 1 Gas type Gas funnel
Check Top Marking: N100 15. Semi-Conductor Measure resistance of terminal to terminal Red-White : White-Black : Elect type Gas type

MOTOR DIAGRAM AND SCHEMATIC
NOTE When checking Component, be sure to turn Power off, then do voltage discharge sufficiently.
Contact On / Off by Centrifugal Switch
STOP MODE (When Motor does not operate)
RUN MODE (Motor operates)

Centrifugal switch

Centrifugal switch (Pull Drive forward)

CONTROL LAY - OUT

PWB ASSEMBLY DISPLAY LAYOUT
MODEL DISPLAY AS DIAGNOSTIC TEST
DLE8377WM/ DLE8377NM DLG388WM/ DLG8388NM X O

OPTION PART

LED DISPLAY

ELETRIC GAS

6871EL1011A 6871EL1011B

PWB ASSEMBLY LAYOUT

MODEL AS DIAGNOSTIC TEST
DLE8377WM/ DLE8377NM DLG388WM/ DLG8388NM

"a" RLY200

c TRANS

6170EC1006F 6170EC1006F

6871EL1013C 6871EL1013D

WIRING DIAGRAM

ELECTRIC DRYER WIRING DIAGRAM

ELECTRONIC CONTROL

L1 BLACK

N WHITE

BLACK WHITE RED TRANS BL2

TAP RELAY BLACK

TAP RELAY WHITE

BROWN BROWN

YELLOW

PLC MODEM

COM NO

BELT SWITCH

OUTER COIL INNER COIL

BLUE HEATER

GRAY NC

CENTRIFUGAL SWITCH

SAFETY THERMOSTAT

DOOR SWITCH

OVERLOAD PROTECTOR
MOISTURE THERMISTOR SENSOR MOISTURE SENSOR RED

BLOWER THERMOSTAT

HI - LIMIT THERMOSTAT

GAS DRYER WIRING DIAGRAM

POWER CORD L1 BLACK N WHITE

ORANGE RED

WH1 TRANS

TAP RELAY BLACK BL2

BLACK WHITE RED NA6

LAMP YELLOW

IGNITER

HI-LIMIT THERMOSTAT

DC VALVE1 DC VALVE2 MOISTURE THERMISTOR FLAME SENSOR DETECTOR MOISTURE SENSOR GRAY

PINK WHITE

DIAGNOSTIC TEST
1. This TEST should be used for Factory test /Service test. Do not use this DIAGNOSTIC TEST other than specified. 2. Activating the Heater manually with the Door open may trip the Thermostat attached to the Heater, therefore do not activate it manually. (Do not press the door switch to operate the heater while the door is open )
ACTIVATING THE DIAGNOSTIC TEST MODE
1. Unit must be in Standby (unit plugged in, display off) 2. Press POWER while pressing MORE TIME, and LESS TIME simultaneously.
Pressing the START/PAUSE button

CHECKING ACTION

DISPLAY

CHECKING POINT

Wont power up Detective LED or LCD Thermistor open
See test 1 Display: See page See test 2
Electric control & Temperature sensor

LQC TEST tE1 tE2

Thermistor close Motor runs See test 3
70 ~ 239 Displays Moisture Sensor Operation: Measured If moisture sensor is contacted with Moisture Value. damp cloth. The display number is below 180, in normal condition. ELECTRIC TYPE: Heater runs GAS TYPE: GAS Valve runs (Display the Temperature of Inside drum.)

See test 4

ELECTRIC TYPE Motor + Heater 1 (2700W) GAS TYPE Motor + Valve
ELECTRIC TYPE Motor + Heater 1 +Heater 2 (5400W) GAS TYPE Motor+Valve

Current Temp.

Gas valve See test 7

3 times

Current Temp. (5 ~ 70)

50~230 Measured

4 times 5 times During check, If the door is open.

Motor, Heater

SE(Error Display)
Motor, Heater Off Semi-conductor

See test 8 Auto Off

Control Off Motor & Heater Off + Lamp On + Buzzer beeps seven times
dE or Error (THE DOOR IS OPEN.PLEASE CLOSE THE DOOR COMPLETELY)
Door switch Lamp Press Start button 1 time and then open the door. Proceed again with the step 1 (by pressing start 1 time), step 2 (by pressing start 2 times), step 3 (by pressing start 3 times) and step 4 (by pressing start 4 times) in sequence. Press Start 2 times and then open the door. Proceed again from the step 1 all the way to the step 4. Press Start 3 times and then open the door Proceed with the step 1 and skip the step 2 and press step 3 twice and finish with step 4 by making sure the all the electric devices shut off in the end.

See test 6

Motor on & Heater During check, Off + Lamp Off If the door is closed.

70 ~ 239

Test 1 120V AC Electrical supply

Caution

When measuring power, be sure to wear insulated gloves, to and avoid an electric shock.
Trouble Symptom No power was applied to Controller. (LED,LCD Display off) Measurement Condition With Dryer Power On; Connector linked to Controller.
Check the outlet, is the voltage 110V ~ 125V AC?
Check the fuse or circuit breaker.

BK2 or WH2 WH1

Check if the voltage measured between Connector BK2 or WH2- (Black Wire) Linked to the Controller and WH1(White Wire) Is 110~125V?
Check if Power Cord is properly connected.
N (White) L (Black) L (Led)
Check if the Controller wire is disconnected. Check if Terminal Block and Power Cord are connected (Check Plug ). - Does Power Cord N (Natural) line match to Terminal Center N (Natural) line?

BK2 WH1

Measure while Door is closed. Check it resistance is below 2500 between WH1- (White wire) and BK2- Connector WH1,BL2 after taking WH1,BL2 out from Controller.
Door switch Check (Refer to Component testing.)
Measure while Door is open. Check it resistance is 300~60 between WH1- (White wire) and BK2(Black wire). Connector WH1,BL2 after taking WH1,BL2 out from Controller.
Measure while Door is open. Check it resistance is below 1 between BL2- (Yellow wire) and WH1- (White wire) after taking Connector WH1,BL2 out from Controller.
Check Lamp. (When opening Lamp, replace then measure again.) Door switch Check(Refer to Component testing.)
Measure while Door is closed. Check it resistance is below 1 between BL2- (Yellow wire) and WH1- (White wire) after taking Connector WH1,BL2 out from Controller.
Check Controller. Check Harness-linking connector.
Test 6 Heater switch test - Electric Type
Before measuring resistance, be sure to turn Power off, and do voltage discharge. (When discharging, contact the metal plug of Power cord with earth line.) While operating, Heating will not work.
Trouble Symptom Drying time takes longer.
1. Is resistance between Heater terminal and below 18 ~ 22? 2. Is resistance between Heater terminal and below 18 ~ 22? 3. Is resistance between Heater terminal and below 9 ~ 11?

Replace Heater.

Check if the value of measured resistance is below 1 between terminal TH2 (Safety Thermostat). NO

TH3 TH2

Replace TH2 (Safety Thermostat).
Check if the value of measured resistance is below NO 1 between terminal TH3 (HI-Limit Thermostat). Replace TH3 (HI-Limit Thermostat).
Check Motor. Check if the value of measured resistance is below 1 between terminal and at RUN condition.
Check Motor and replace it.
Check Controller. Check Harness-linking Connector.
Test 7 GAS Valve test - Gas Type
When measuring power, be sure to wear insulated gloves, to avoid electric shock.
Trouble Symptom Drying time takes longer. Measurement Condition With dryer power on
While operating, Heating will not work.
Power On & Start (Normal Cycle)

Valve 1

When measuring Valve 1 voltage, More than DC 90V?
Check thermostat Hi limit Safety
Igniter operates? (after 1 min, Igniter becomes reddish)

Igniter

Valve 2
Check Igniter & Frame detect
When measuring Valve 2 voltage, Value is more than DC 90V? (10 sec after Igniter off) Check Gas connection or Gas supply

When measuring terminal resistance on Valve 1 and Valve 2, Valves are more than1.5 ~ 2.5k? YES (Measure after Off )

Change Valve

If Valve 1 and Valve 2 are under DC 10V, Valves NO are Off? Change Valve
Harness check Controller change

Test 8 Semi Conductor

Trouble Symptom Degree of Resistance is not in 30030 Measurement Condition Turn the Dryers Power Off, then measure resistance.
Check Semiconductor and Harness Connector Check Harness linking connector
When measuring resistance Is resistance ?
When measuring resistance in Semi-Conductor Is resistance ? 1. Is the measurement within the range of NO between Red-White? 2. Is the measurement within the range of between Black-White?

Normal Condition

CHANGE GAS SETTING (NATURAL GAS, PROPANE GAS)
Changing orifices and gas valve adjustments improperly can result in an explosion and/or fire. Conversion must be made by a qualified technician.

Warning

Initially, Natural Gas mode is

STEP 1 : VALVE SETTING

set. Propane Gas Orifice is on sale as a Service Part to authorized servicers only.

Opened

Closed

Full open

Adjustment screw

STEP 2 : ORIFICE CHANGE

Remove 2 screws. Disassemble the pipe assembly. Replace Natural Gas orifice with Propane Gas orifice.

Gas type

Orifice P/No Marking

NCU PCU

Natural Gas 4948EL4001B Propane Gas 4948EL4002B

Orifice

Kit contents: Orifice (Dia. = 1.613mm, for Propane Gas) Replace Label Instruction Sheet

GAS VALVE FLOW

START KEY PUSH VALVE 1 ON (VALVE 2 OFF) IGNITER ON
IGNITER TEMPERATURE ABOUT 370F
FLAME DETECT OPEN IGNITER OFF VALVE 2 ON

GAS IGNITION

FLAME DETECT CLOSE VALVE 2 OFF

DRYING

START VALVE 1 IGNITER FLAME DETECT VALVE 2 ON ON CLOSE OFF OFF OPEN ON GAS IGNITION

GAS VALVE STRUCTURE

Adjustment Screw

DISASSEMBLY INSTRUCTIONS

Disassemble and repair the unit only after pulling out power plug from the outlet.

TOP PLATE

When you disassemble the top plate, be sure to take gloves and careful plates edge. Failure to do so can cause serious injury.
1. Remove 3 screws on the upper plate.

2. Push the top plate back ward.

3. Lift the top plate

CONTROL PANEL ASSEMBLY
When you disassemble the control panel, be sure to take gloves and careful panel frames edge. Failure to do so can cause serious injury.
1. Remove 2 screws on the control panel

frame.

2. Disconnect the connectors.
3. Pull the control panel assembly upward and

then forward.

4. Remove 9 screws on the PWB(PCB)

assembly, display.

5. Remove 4 screws on the PWB(PCB)

assembly, main.

6. Disassemble the control panel assembly.

COVER CABINET

When you disassemble the door switch connector, be sure to take gloves and careful cabinet edge. Failure to do so can cause serious injury.
1. Disassemble the top plate. 2. Disassemble the control panel assembly. 3. Disassemble the door assembly. 4. Remove 2 screws.
5. Remove 4 screws from the top of cabinet cover. 6. Disconnect the harness of door switch.

TUB DRUM [FRONT]

When you disassemble the lamp connector, be sure to take gloves and careful cabinet edge. Failure to do so can cause serious injury.
1. Disassemble the top plate. 2. Remove Cover Cabinet. 3. Disconnect the door lamp and electrode

sensor connector.

4. Remove 4 screws. 5. Disassemble the Tub Drum [Front].

DRUM ASSEMBLY

1. Disassemble the top plate. 2. Remove the Cabinet Cover and

Tub drum [front].

3. Loosen belt from motor and idler pulleys. 4. Carefully remove the drum.

CHANGING THE DRUM LAMP

1. Disassemble the door. 2. Hold the lamp shield in place while removing the

screw.

3. Slide the shield up and remove. 4. Remove the bulb and replace with a 15 watt,
120 volt candelabra-base bulb.
5. Replace the lamp shield and screw.

DRYER EXHAUST CHANGE

When you disassemble and install ventilation, be sure to take gloves and careful exhaust edge. Failure to do so can cause serious injury.
1. Remove a screw and the exhaust duct.
2-1. Detach and remove a knockout at the botton,
left or right side as desired. (Right Side Vent not available on Gas dryer) , , the order of work.
2-2. Reconnect the another duct [11 in (28cm)] to

DUCT TAPE

the blower housing, and attach the duct to the base. (Duct is a SVC part)
3-1. Pre-assemble 4" elbow with 4" duct.
Wrap duct tape around joint.
3-2. Insert the elbow duct assembly through the side
opening and connect the elbow to the internal duct.

1. Remove the filter. 2. Remove 3 screws. 3. Remove the Cover Grid. 4. Disconnect the electrode sensor.
1. Disassemble the top plate. 2. Remove the Cabinet Cover and Tub Drum [Front]. 3. Remove the Drum assembly. 4. Remove 2 screws and cover (Air guide). 5. Remove the bolt and washer. 6. Remove the fan. 7. Disconnect the motor clamp and motor.
1. Disassemble the top plate. 2. Remove the Cabinet Cover and Tub Drum [Front]. 3. Remove the Drum assembly. 4. Remove 7 screws. 5. Remove the Back Cover.
1. Disassemble the top plate. 2. Remove the Cover Cabinet. 3. Remove the filter and 2 screws. 4. Remove the air duct.
1. Disassemble the top plate. 2. Remove the Cover Cabinet and Tub Drum [Front]. 3. Remove the Drum assembly and Tub Drum [Rear]. 4. Disconnect the Air duct from the Tub Drum [Front]. 5. Remove the roller from the Tub Drum [Front]

and Tub Drum [Rear].

EXPLODED VIEW
12-1. Control Panel & Plate Assembly
12-2. Cabinet & Door Assembly

A800 A570 A560

A600 A330 A550
A530 A520 A525 A540 A430 A510
12-3-1. Drum & Motor Assembly: Electric Type

F200 K400

K140 K100

K251 K310

K330 K222 K221 K230 K210 K350 K250

K360 K550 K251 K570 K560

K240 K530 F140 K540 K510 K520 K640 K651

F130 F110 K600 K650

12-3-2. Drum & Motor Assembly: Gas type
K240 K530 K640 K540 M141 M160 K600 M171 M170 M140 M110 M190 M180 M181 M250 M230 M210 M150 M240 M220 K650 K510 K520 K651
M171: Propane Gas orifice M170: Natural Gas orifice

REPLACEMENT PARTS LIST

CAUTION: Before replacing any of these components, read the safety precautions in this manual. Note: S(Safety Parts), AL (Alternative parts)
LG MODEL: TD-V10062E, TD-V10060E Model P/No Description DLE2512W DLE2514W CABINET ASSEMBLY 3091EL0003A 3091EL0003A MOTOR ASSEMBLY. WM 4681EL1002A 4681EL1002A BRACKET, BASE 4810EL3001A 4810EL3001A BRACKET, BASE 4810EL3009A 4810EL3009A LEG 4778EL3001A 4778EL3001A PULLEY ASSEMBLY, MOTOR 4561EL3002A 4561EL3002A SWITCH, MICRO 3W40025D 3W40025D BLOWER ASSEMBLY 5835EL1002A 5835EL1002A HOUSING ASSEMBLY (MECH), BLOWER 3661EL1001C 3661EL1001C DUCT ASSEMBLY 5209EL1006A 5209EL1006A THERMISTOR ASSEMBLY 6323EL2001B 6323EL2001B THERMOSTAT ASSEMBLY 6931EL3002A 6931EL3002A TUB, DRUM [BACK] 3044EL002C 3044EL002C DUCT ASSEMBLY 5209EL1001C 5209EL1001C ROLLER ASSEMBLY 4581EL3001A 4581EL3001A HEATER ASSEMBLY 5301EL1001E 5301EL1001E THERMOSTAT ASSEMBLY 6931EL3003D 6931EL3003D THERMOSTAT ASSEMBLY 6931EL3001E 6931EL3001E HARNESS, PWB 6877EL1007A 6877EL1007B TUB ASSEMBLY, DRUM 3045EL1002D 3045EL1002D SEAL 4036EL3001A 4036EL3001A LIFTER 4432EL1002B 4432EL1002B BELT, POLY-V 4400EL2001A 4400EL2001A TUB , DRUM [FRONT] 3044EL1001A 3044EL1001A LAMP ASSEMBLY 6913EL3002C 6913EL3002C ROLLER ASSEMBLY 4581EL3001A 4581EL3001A DUCT ASSEMBLY 5209EL1002A 5209EL1002A COVER, GUIDE 3550EL1006B 3550EL1006B SENSOR 6500EL3001A 6500EL3001A GUIDER, FILTER 4974EL1003B 4974EL1003B FILTERASSEMBLY, LINT 5231EL1003B 5231EL1003B FRAME ASSEMBLY 3211EL1005A 3211EL1005A CLAMP 4860EL3001A 4860EL3001A CONNECTOR ASSEMBLY 6631EL3003B 6631EL3003B COVER, CABINET 3550EL0006A 3550EL0006A SWITCH ASSEMBLY, DOOR 6601EL3001A 6601EL3001A 4027EL1001A 4027EL1001A LATCH ASSEMBLY DOOR ASSEMBLY 3581EL0003B 3581EL0003A LATCH, HOOK 4026EL3007A 4026EL3007A GASKET 4986EL2004D 4986EL2004D TOP PLATE ASSEMBLY 3457ER1006E 3457ER1006E PANEL, CONTROL 3720EL0002A 3720EL0002A PWB (PCB) ASSEMBLY 6871EC1121C 6871EC1121C PWB (PCB) ASSEMBLY, DISPLAY 6871EC1120A 6871EC1120A RACK 3750EL1001B 3750EL1001B SIDE VENTING KIT 383EEL9001B 383EEL9001B

www.LGEservice.com

DISCOVERY DRYER TRAINING MANUAL

CAUTION!

READ THIS MANUAL CAREFULLY BEFORE DIAGNOSING OR SERVICING THIS PRODUCT.
Customer Service (and Part Sales) Technical Support (and Part Sales) USA Website Customer Service Website B2B Service Website LG CS Academy
(800) 243-0000 (800) 847-7597 us.lgservice.com us.lgservice.com biz.lgservice.com lgcsacademy.com
Published April 2006 by LG Technical Support and Training

IMPORTANT SAFETY NOTICE

The information in this training manual is intended for use by persons possessing an adequate background in electrical equipment, electronic devices, and mechanical systems. In any attempt to repair a major appliance, personal injury and property damage can result. The manufacturer or seller maintains no liability for the interpretation of this information, nor can it assume any liability in conjunction with its use. When servicing this product, under no circumstances should the original design be modified or altered without permission from LG Electronics. Unauthorized modifications will not only void the warranty, but may lead to property damage or user injury. If wires, screws, clips, straps, nuts, or washers used to complete a ground path are removed for service, they must be returned to their original positions and properly fastened.

CAUTION

To avoid personal injury, disconnect the power before servicing this product. If electrical power is required for diagnosis or test purposes, disconnect the power immediately after performing the necessary checks. Also be aware that many household appliances present a weight hazard. At least two people should be involved in the installation or servicing of such devices. Failure to consider the weight of an appliance could result in physical injury.

ESD NOTICE

Some of the electronic components in appliances are electrostatic discharge (ESD) sensitive. ESD can weaken or damage the electronics in these appliances in a manner that renders them inoperative or reduces the time until their next failure. Connect an ESD wrist strap to a ground connection point or unpainted metal in the appliance. Alternatively, you can touch your finger repeatedly to a ground connection point or unpainted metal in the appliance. Before removing a replacement part from its package, touch the anti-static bag to a ground connection point or unpainted metal in the appliance. Handle the electronic control assembly by its edges only. When repackaging a failed electronic control assembly in an anti-static bag, observe these same precautions.

REGULATORY INFORMATION

This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 if the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a residential installation. This equipment generates, uses, and can radiate radio frequency energy, and, if not installed and used in accordance with the instruction manual, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures: Reorient or relocate the receiving antenna; Increase the separation between the equipment and the receiver; Connect the equipment to an outlet on a different circuit than that to which the receiver is connected; or consult the dealer or an experienced radio/TV technician for help.

COMPLIANCE

The responsible party for this devices compliance is LG Electronics Alabama, Inc.; 201 James Record Road, Huntsville, AL, 35824.
DLE8377xM/DLG8388xM DLE7177WM/DLG7188WM

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TRAINING MANUAL

Contents

Regulatory Notices Contents Introduction Sensor Dry Manual Dry Gas Safety Page Specifications Accessories Installation (of accessories) Rack Stacking Kit Pedestal Modem and Monitor Electric Dryer Pigtail 4-wire Connection 3-wire Connection Gas Dryer Piping Dryer Cycle Chart Component Test Procedures Motor Diagram and Schematic Safety Switches Control and PCB Layout Wiring Diagram Diagnostic Test Test V AC Electrical Supply Test 2 Thermistor Test (Power Off) Test 3 Motor Test Test 4 Moisture Sensor Test Test 5 Door Switch Test Test 6 Heater Switch Test (Electric Dryer) Test 7 Gas Valve Test (Gas Dryer) Test 8 Semiconductor Test Gas Conversion (Natural to Propane) Safety Warning Orifice Gas Valve Operation Flow Chart Ignition Sequence continued on next page DLE8377xM/DLG8388xM DLE7177WM/DLE7188WM 42 42

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Contents, continued
Disassembly/Repair Top Cover Control Panel Front Cover and Door Door Reversal Tub Front Drum Assembly and Belt Lamp Vent Replacement (Rear to side exhaust) Filter Assembly and Moisture Sensor Back Cover Air Duct Rollers Blower and Housing Exploded Views Top Cover and Control Panel Cabinet and Door Drum and Motor (Electric Dryer) Drum and Motor (Gas Dryer) Parts List 56 57
DLE8377xM/DLG8388xM DLE7177WM/DLE7188WM

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INTRODUCTION
The DISCOVERY dryer is very similar to other LG dryers with the exception of the LCD display on the control panel. The LCD display shows all the information formerly indicated by LEDs but also allows for scrolling instruction.
When a cycle is selected, the options are preset. They can be overridden by changing them using the option buttons. Pressing the buttons cycles through the available options. If an option is not available for a particular cycle, it is grayed out or not available for selection. For example, the EXTRA HOT wash is not available for the DELICATE cycle. The interior components remain the same: motor, belt, drum, and heat source (gas or electric). The gas model can be refitted with an orifice to allow the use of propane instead of natural gas. All such conversions and adjustments should be performed by a licensed and certified gasfitter. The DISCOVERY model also has an additional sensor in the exhaust stream to detect the moisture level more accurately for better drying results.

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DRYER Models DLE7177WM and DLG7188WM use the LED indicator panel instead of the newer LCD. The only difference is the type of display. The dryers function identically. The main and display PCB (Printed Circuit Board) will carry a different part number depending upon the type of display. Always order parts by model number and serial number to ensure receiving the correct parts.
The drying cycle is shown in the left window and the time remaining is show in the right. Feature selections like DRY LEVEL and BEEPER volume are indicated by LEDs on the panel.
The DISCOVERY line of dryers feature enhanced sensor drying. In addition to the drying sensor in the tub near the filter, there is an additional sensor in the exhaust stream to ensure the correct level of dryness is determined, from damp dry to very dry. The dryer can also be set manually to dry at a particular heat level and for a specified time.

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SAFETY
Check the local laws and regulations concerning the installation and connection of gas. In most localities, it is illegal to connect gas piping, re-jet or adjust burners, or repair gas-fired equipment unless you are licensed and certified so to do. It is the servicers responsibility to comply with all such regulation.

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SPECIFICATIONS

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ACCESSORIES

DRYING RACK

STACKING KIT

PEDESTAL

The DRYING RACK is used to dry items that should not be tumbled, like sweaters, tennis shoes, etc. It should be removed and stored when not in use. The rack is included with the dryer. (See installation procedure, page xx.) The STACKING KIT is used to stack a dryer on top of a matching washer. (NEVER put a washer on top of a dryer!) The stacking kit should not be used in situation where there is the possibility of excessive vibration and movement of the washer, such as in a mobile home or an upper floor of a frame structure. The stacking kit is available as an optional purchase. (See installation procedure, page 11.) The PEDESTAL can be used under either the washer or the dryer. It is possible to stack a washer and dryer on a pedestal, but the dryer controls may be difficult to reach and the possibility of vibration and movement is greater. The pedestal is available as an optional purchase. (See installation procedure, page 13.) Pedestals are available in heights of 7 and 13.

INSTALLATION (RACK)

Its simple! Open the dryer door. Put the rack in place. Select RACK DRY (2nd button on right) Press START. Be sure the front of the rack is properly situated in the notches on either side of the filter. The back should rest on the drum and allow the drum to rotate. DLE8377xM/DLG8388xM DLE7177WM/DLE7188WM

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INSTALLATION (Stacking Kit)
WARNING! Do not attempt this alone! At least two people are required to lift the dryer and place it properly on top of the washer. Failure to observe this warning could result in serious physical injury and damage to the appliances. 1. Place the washer on a solid, even floor. If you plan to use a pedestal, install it now before going any further.
Peel the protective paper from the adhesive tape on the side bracket. Fit the side bracket firmly to the top plate using the adhesive tape, as shown in the drawing.
Secure the bracket to the top plate using a screw, as shown. Repeat steps 2, 3, and 4 for the other side.
Level the dryer on a firm solid floor and lock down the adjusters before placing it on top of the washer. (See page xx.) Lift the dryer on top of the washer it toward the front of the washer, as shown. Slide the dryer all the way back to the stop on the rail.

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INSTALLATION (Stacking Kit) continued
6. Install the front rail of the stacking kit. Push the front rail back against the stops on the side brackets.
Insert a screw to attach the front rail to the side bracket. Repeat step 7 for the other side.

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INSTALLATION (Pedestal)
For 27 Pedestals (Washer, Dryer, and Combo) 1. Remove the pedestal, installation hardware, and instructions from the shipping container. Level the pedestal on a solid, flat, level floor. Lock down the rear adjusters, but leave the front ones free for now. Set the dryer on the pedestal and level it. Level it and lock down all four adjusters on the dryer. Note which holes are for the washer and which are for the dryer. If you are stacking the appliances, the washer should be on the bottom.
Remove the protective paper from the adhesive surface of the bracket.
Be particularly careful, because when this adhesive makes contact, there is no adjustment possible. NOTE: Some kits include two sets of brackets (curved for the dryer and flat (shown) for the washer.) Use the correct bracket for your application. (See next page.)

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INSTALLATION (Pedestal) continued
4. Holding the adhesive part of the bracket away from the dryer, insert the screws and get them started. Press the bracket onto the dryer and tighten the screws. 5. Press the brackets onto the sides of the dryer and rub the brackets from side to side to ensure the total adhesive area is attached completely.
Tighten all the screws securely. Lower each leg of the dryer onefourth turn with the adjusting wrench to put a little pressure between the dryer and pedestal to prevent any motion and rattling. Push the dryer into place. Check the level and adjust the front legs of the pedestal as necessary. Then lock down the adjusters.
The pedestal kit includes the mounting plates (with adhesive covered by paper) and the screws to attach the plates. Remember, some pedestal kits come with two sets of brackets. The flat tops are for washers; the curved tops (shown) are for dryers. Use the correct brackets for your application.

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INSTALLATION (Modem and Monitor)
REMOTE MONITOR The monitor plugs in to any 110 Volt outlet in the home. It receives its data signal via the power lines.
Be sure the dryer is unplugged. Remove the modem cover. Save the cover for future use; in the event you must remove the modem, you can replace the cover.
Attach the modem to the socket with the screws provided.
Plug the monitors power cord in an outlet where you can observe it easily. Use the stand or the wall mount bracket. Press and hold the button until the display shows SET.

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ELECTRICAL CONNECTION (Electric Dryer Only)
PIGTAIL INSTALLATION Install the appropriate power cord for the outlet available. Grounding through the neutral conductor is prohibited in new branch-circuits, mobile homes, recreational vehicles, and where prohibited by local code.
4-wire Connection The 4-wire receptacle looks like this.
Power cord with spade terminals.
Power cord with ring terminals.
Install a strain relief on the power cord. Then connect the terminals to the terminal block, matching the wire colors. A. Ground screw on chassis B. Green wire from power cord C. Strain relief D. Neutral screw on terminal block E. Terminal block F. Neutral wire from power cord

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ELECTRICAL CONNECTION (Electric Dryer Only) continued
3-wire Connection The 3-wire receptacle looks like this.
Install a strain relief on the power cord. Then connect the terminals to the terminal block, matching the wire colors. Add a wire to connect the chassis ground to neutral. A. Ground screw on chassis B. Green wire from power cord C. Strain relief D. Neutral screw on terminal block E. Ground-to-neutral connection F. Neutral wire from power cord

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Be sure to tighten all screws firmly, but do not strip them or distort the contact area. Be sure to install a strain relief on the power cord.
Replace the terminal block cover by inserting the tabs into the slots and letting them slide down to engage. Fold it over to the back of the dryer so it covers the access to the terminal block. Be sure no wires are exposed or could touch any metal surface.
Secure the cover with a screw.

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GAS CONNECTION (Gas Dryer Only)
CAUTION! (This warning applies to both natural gas and propane.) Gas is both flammable and explosive. Use caution when working with gas. In most locations, installing and connecting gas is restricted to properly trained and licensed persons.
Always inspect joints and connections for a leak with a soapy solution. If you see bubbles, turn the gas off and open a window. If you smell gas, turn off the main valve and open a window. The gas dryer requires a 110 Volt, single-outlet, dedicated circuit. The cord is installed at the factory and no user-intervention is required.

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DRYER CYCLE CHART
* SENSOR DRY ** MANUAL DRY
The dryness level is set by the customer. The temperature is set by the customer.
The default settings can be overridden by the customer.

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COMPONENT TESTING PROCEDURES
Testing the various components of the dryer is relatively simple. Most can be checked without major disassembly.

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COMPONENT TESTING PROCEDURES continued

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MOTOR DIAGRAM and SCHEMATIC
To check the motor, turn the power off and allow the capacitor to discharge. The centrifugal switch serves as a safety device to turn off the fuel (gas or electricity) to the heater if the motor fails to rotate.

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DRYER SAFETY SWITCHES The centrifugal switch slides back and forth on the motors shaft to operate the contacts as shown in the previous diagram. This switch provides safety in the event the motor fails. When the motor is running, centrifugal force causes the weight (black wing in photo) to slide back toward the motor windings. This motion allows electricity to operate the heater (electric element or gas valve). If the motor stops, the weight slides forward and turns the power off. RUN POSITION STOP POSITION

There is an additional safety in the form of a belt switch that shuts off power to the electric motor if the belt breaks. Belt tension holds the switch closed. If the belt breaks, the switch opens and power to the motor is cut. When the motor stops, the centrifugal switch functions as a safety device to turn off the fuel (gas or electricity). The centrifugal switch includes a multipin connector (shown). The belt switch is simple. If the belt breaks, the spring pulls the lever down and it presses the switch.

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DISPLAY PWB
The display board is actually two boards connected by a ribbon cable. One board holds the selector knob and cycle indicator LEDs. The other holds the LCD display and adjustment buttons to override the pre-set cycle selections.
The DLE7177WM board is shown below. Other models vary slightly.
The gas and electric models have a different display board.

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MAIN PWB
The main board includes the relays that operate electric heaters and gas valves.
The gas and electric models have a different main board.

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Electric Dryer Wiring Diagram

Gas Dryer Wiring Diagram

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DIAGNOSTIC TEST MODE

The diagnostic test mode is for service testing only. Do not activate the heater manually with the door open or it will trip the thermostat attached to the heater. 1. 2. 3. 4. Dryer must be in standby mode. (Plugged in, turned off) Press and hold MORE TIME and LESS TIME, then press power. Press START/PAUSE to advance to the next test. Unplug the dryer for one minute after using the diagnostic mode.

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DIAGNOSTIC TEST PROCEDURES
The following pages will assist in troubleshooting and diagnosing issues with the dryer. Each test will list the appropriate precautionary measures along with symptoms and the conditions under which the testing should be performed.
TEST V AC ELECTRICAL SUPPLY
WARNING! SYMPTOM! CONDITION! Use insulated gloves to avoid electrical shock. No power, display off. Power on to dryer, controller connected.

continued on next page

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WARNING! SYMPTOM! CONDITION!
Use insulated gloves to avoid electrical shock. Check the TAB RELAY connections. Power on to dryer, controller connected.

POWER CONNECTION

CONNECTION STATUS (Electric)

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DRYER If the power connection is reversed, the dryer will not operate and components can be damaged. CONNECTION STATUS REVERSED (Incorrect) (Electric)
CONNECTION STATUS REVERSED (Incorrect) (Gas)

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TEST 2 Thermistor Test (Power Off)
WARNING! SYMPTOM! Use insulated gloves to avoid electrical shock. tE1 and tE2 error codes occur during the test. Heater does not turn off. Significant difference between actual and sensed temperature. Power off.

CONDITION!

Table Thermistor resistance/temperature

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TEST 3 Motor Test
WARNING! SYMPTOM! CONDITION! Discharge (see below) before measuring resistance. Motor, fan, and heater do not function. Turn power off, unplug dryer, and discharge by shorting line and neutral to ground at the end of the power cord.

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TEST 4 Moisture Sensor Test
WARNING! SYMPTOM! CONDITION! Discharge (see below) before measuring resistance. Dryness of clothing does not match set dry level. Turn power off, unplug dryer, and discharge by shorting line and neutral to ground at the end of the power cord. Measure resistance.
Table IMC Ratio and Display Value (IMC = Initial Moisture Content)

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TEST 5 Door Switch Test
WARNING! SYMPTOM! CONDITION! Discharge before measuring resistance. Door opening not sensed (dryer runs with door open). Turn dryer off, unplug, discharge, and measure resistance.

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TEST 6 Heater Switch (Electric Dryer Only)
WARNING! SYMPTOM! CONDITION! Discharge before measuring resistance. Heater does not operate. Turn power off, unplug, discharge, and measure resistance.

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TEST 7 Gas Valve Test (Gas Dryer Only)
WARNING! SYMPTOM! CONDITION! Use insulated gloves to avoid electrical shock. Heater does not operate. Power on.

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TEST 8 Semiconductor (Sensor) Test
WARNING! SYMPTOM! CONDITION! Discharge before measuring resistance. Resistance is not Turn power off, unplug, discharge, and measure resistance.

Pull the control panel upward, then forward. Be sure to disengage all the plastic tabs along the top. Lay the control panel on its face on a soft, protective cloth.

5. 6. 7.

Remove nine screws on the display PWB. Remove four screws on the main PWB. Disassemble the control panel.

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DRYER FRONT CABINET 1. 2. 3. 4. Remove the top plate. Remove the control panel. Remove the door, if necessary for the repair. Remove two screws in the bottom of the door opening.
Remove four screws from the top of the front cabinet. Tilt the front away from the dryer and disconnect the door switch wire harness.
DOOR REVERSAL 1. Remove two screws that hold the door. Remove the door and set it aside on a soft, protective cloth. Save the hinge shim. Remove two screws near the latch. Remove two screws and the latch piece. Rotate everything 180 and reinstall so the door opens from the other side.

2. 3. 4.

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DRYER TUB FRONT 1. 2. 3. 4. 5. DRUM, BELT, and PULLEY 1. 2. 3. Remove the drum front. Reach in and remove the belt from the motor and pulley. Lift the drum out through the front of the dryer. The belt will still be around the drum. To replace the drum, put the belt around it and set into the dryer to rest on the two rubber wheels on the tub back. Let the belt hang. Replace the tub front, holding the drum up so it can set on the two rubber wheels on the tub front. Make sure the belt is around the circumference of the drum near the point where it usually rides. Reach in through the front or the side and loop the belt around the motor shaft and the pulley. Rotate the drum by hand a couple of turns to seat it. Remove the top plate. Remove the front cabinet. Disconnect the door lamp (top) and electrode sensor (bottom). Remove the four screws holding the front assembly. Lift the tub front up and away.

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DRYER DRUM LAMP The drum light can usually be changed without a major disassembly, unless the bulb is frozen in the socket. If the bulb cant be changed using this procedure, youll have to remove the front cover and the lampholder to get to the socket. 1. 2. 3. 4. Open the door. Hold the lamp shield in place and remove the screw. Slide the shield toward the screw and remove it. Unscrew the bulb and replace it with a 15-watt, 120 V, candelabra-base bulb. Replace the shield and screw.
Notice the bulb holder has feet that hold it in place and tabs to keep it positioned properly. The socket can be removed and replaced by squeezing the tabs and pulling the bulb and socket into the housing. Press it back into place after changing the bulb.

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DRYER VENT REPLACEMENT 1. Use the VENT KIT to change the exhaust direction. (Part # 383EEL9001B) On the back of the dryer, remove the screw securing the exhaust duct. 2. (A) Remove the knockout on the left, right*, or bottom, as necessary. * Right vent option not available on gas dryers due to internal piping interference. (B) Insert the replacement pipe. (C) Attach the pipe with a screw. 3. Pre-assemble the elbow and a replacement duct and secure the joint with duct tape.

Insert the pre-assembled elbow into the dryer through the vent hole and connect it to the internal pipe.
Tear off some pieces of duct tape and secure that joint as well. Connect the pipe to the exhaust duct.

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DRYER FILTER ASSEMBLY and MOISTURE SENSOR 1. 2. 3. 4. Remove the lint filter. Remove three screws holding the cover grid. Remove the cover grid. Disconnect the electrode sensors.
BACK COVER 1. 2. 3. 4. 5. 6. Remove the top plate. Remove the front cover. Remove the tub front. Remove the drum. Remove 7 screws. Remove the back cover.

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DRYER AIR DUCT 1. 2. 3. 4. 5. Remove the top plate. Remove the front cover. Remove the filter. Remove 2 screws at the top of the air duct. Remove the air duct.

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DRYER ROLLERS 1. 2. 3. 4. 5. Remove the top plate. Remove the front cover. Remove the tub front. Remove the drum (if replacing the back rollers.) Use an open-end wrench to remove and replace the shaft and roller.
NOTE: If the shaft is OK and you are replacing only the roller, you can squeeze the triangular retainer to remove and replace the roller without removing the shaft from the machine.
Be sure to install the small bushings. These must be between the roller and the retainer on both sides of the roller. See photo.

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DRYER BLOWER HOUSING 1. 2. 3. 4. 5. 6. 7. 8. 9. Remove the top plate. Remove the front cover. Remove the tub front. Remove the drum. Remove the two screws and the cover on the air guide. Remove the nut and washer on the blower shaft. Remove the fan from the shaft. Press down the hooked end of the clamps and remove them. Disconnect and remove the motor.

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EXPLODED VIEW (Control Panel and Top Plate Assembly)

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EXPLODED VIEW (Cabinet and Door Assembly)

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EXPLODED VIEW (Drum and Motor Electric Model)

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EXPLODED VIEW (Drum and Motor Gas Model)

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PARTS LIST
DLE8377NM DLE8377WM Part No DLG8388NM Part No DLG8388WM Part No
Loc *001 *002 *004 A110 A120 A130 A140 A210 A211 A300 A305 A310 A320 A330 A330 A390 A400 A410 A420 A430 A450 A460 A500 A510 A520 A525 A530 A540 A560 A570 A600 A700 A800 F110 F120 F130 F140 F200 K100 K120 K130
Description Owner's Manual Box, Carton Manual, Service Panel Assembly, Control PCB Assembly, Display PCB Assembly, Main Knob Assembly Plate Assembly, Top Plate, Upper Bracket, Hinge Bracket, Hinge Cabinet Cover Assembly Locker Assembly Switch, Micro Safety Switch Assembly Frame Assembly Door Assembly Locker, Hook Outer Door Frame Hinge Inner Door Frame Gasket Cabinet Assembly Cap (Knockout cover) Bracket, Base Bracket, Base Bracket, Base Leg Cover, Guide Cover, Safety HARNESS, PWB Rack Parts Asby (Side Vent Kit) Heater Assembly (Elec) Bracket, Heater Thermostat Thermostat Assembly Duct Assembly Tub Assembly, Drum Lifter Belt, Poly V

Part No

3829EL3009B 3890EZ3613A 3828EL3005D 3721EL0009C 6871EL1011A 6871EL1013C 4941ER3005A 3457ER1006X 3300EL2001E 4810EL3006A 4810EL3006B 3551EL0009B 4027EL1001A 6601EL3001A 6601EL3001A 3211EL1004A 3581EL0004A 4026EL3007A 3212EL1015A 4774EL2001A 3212EL1005B 4986EL2004A 3091EL0003P 5006EL3001G 4810EL3001A 4810EL3009A 4810EL3009B 4778EL3001A 3550EL3007A 3550EL3002A 6877EL1019B 3750EL1001B 383EEL9001B 5301EL1001G 4810EL1007A 6931EL3003D 6931EL3001E 5209EL1001C 3045EL1002E 4432EL1002B 4400EL2001A
3829EL3009B 3890EZ3613A 3828EL3005D 3721EL0009A 6871EL1011A 6871EL1013C 4941ER3005A 3457ER1006D 3300EL2001A 4810EL3006A 4810EL3006B 3551EL0009A 4027EL1001A 6601EL3001A 6601EL3001A 3211EL1004A 3581EL0004A 4026EL3007A 3212EL1015A 4774EL2001A 3212EL1005B 4986EL2004A 3091EL0003M 5006EL3001D 4810EL3001A 4810EL3009A 4810EL3009B 4778EL3001A 3550EL3007A 3550EL3002A 6877EL1019B 3750EL1001B 383EEL9001B 5301EL1001G 4810EL1007A 6931EL3003D 6931EL3001E 5209EL1001C 3045EL1002E 4432EL1002B 4400EL2001A
3829EL3009B 3890EZ3613A 3828EL3005D 3721EL0009D 6871EL1011B 6871EL1013D 4941ER3005A 3457ER1006X 3300EL2001E 4810EL3006A 4810EL3006B 3551EL0009B 4027EL1001A 6601EL3001A 6601EL3001A 3211EL1004A 3581EL0004A 4026EL3007A 3212EL1015A 4774EL2001A 3212EL1005B 4986EL2004A 3091EL0003Q 5006EL3001G 4810EL3001A 4810EL3009A 4810EL3009B 4778EL3001A 6411ER1005B 6877EL1020B 3750EL1001B 383EEL9001B
3829EL3009B 3890EZ3613A 3828EL3005D 3721EL0009B 6871EL1011B 6871EL1013D 4941ER3005A 3457ER1006D 3300EL2001A 4810EL3006A 4810EL3006B 3551EL0009A 4027EL1001A 6601EL3001A 6601EL3001A 3211EL1004A 3581EL0004A 4026EL3007A 3212EL1015A 4774EL2001A 3212EL1005B 4986EL2004A 3091EL0003N 5006EL3001D 4810EL3001A 4810EL3009A 4810EL3009B 4778EL3001A 6411ER1005B 6877EL1020B 3750EL1001B 383EEL9001B
5209EL1001D 3045EL1002E 4432EL1002B 4400EL2001A

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Loc K140 K210 K221 K222 K230 K240 K250 K251 K310 K320 K330 K340 K350 K360 K400 K510 K520 K530 K540 K550 K560 K600 K610 K620 K640 K650 K651 M110 M140 M141 M150 M160 M170 M171 M180 M181 M190 M210 M220 M230 M240 M250
Description Gasket Tub, Drum (Front) Lamp, Incand., Assembly Lamp, Incandescent, Bulb Cover, Lamp Duct Assembly Roller Assembly Roller Assembly Filter Assembly, Lint Cover, Guide Guide, Filter Sensor Cable & Wire Holder Tub, Drum (Rear) Casing Assembly Housing Asby, Blower Duct Assembly Guide Assembly Thermistor, NTC Thermostat Bracket, Motor Motor, Unclassified Clamp Switch, Micro Pulley Assembly, Motor Pulley, Idle Valve Assembly, Gas Guide, Burner Bracket, Base Pipe Assembly Igniter Orifice, Natural Gas Orifice, Propane Connector, Mech, Pipe Seal Pipe Assembly Funnel Thermostat Assembly Thermostat Assembly Sensor Assembly Supporter, Holder

4036EL3001A 3044EL1001A 6913EL3002C 6913EL3001A 3550EL2001A 5209EL1002A 4581EL2002A 4581EL3001A 5231EL1003B 3550EL1006B 4974EL1003B 6500EL3001A 6631EL3003B 4930EL2004B 3044EL0002B 5835EL1002A 3661EL1001E 5209EL1006A 4975EL3001A 6323EL2001B 6931EL3002A 4810EL1002A 4681EL1002A 4860EL3001A 3W40025Q 4561EL3002A 4560EL3001A
4036EL3001A 3044EL1001B 6913EL3002C 6913EL3001A 3550EL2001A 5209EL1002A 4581EL2002A 4581EL3001A 5231EL1003B 3550EL1006B 4974EL1003B 6500EL3001A 6631EL3003B 4930EL2004B 3044EL0002B 5835EL1002A 3661EL1001E 5209EL1006A 4975EL3001A 6323EL2001B 6931EL3002A 4810EL1002A 4681EL1002A 4860EL3001A 3W40025Q 4561EL3002A 4560EL3001A 5221EL2002A 4974EL1001A 4810EL3002A 5201EL3001A 5318EL3001A 4948EL4001B 4948EL4002B 4932EL4001A 4036EL3002A 5201EL2001A 3016EL1001A 6931EL3004B 6931EL3003C 6501EL3001A 4980EL3001A

Page 58 of 60

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2006 LG Electronics, Inc. Printed in the USA