LG DLE5977S User manual

Website:http://www.LGservice.com [For U.S.A]
www.lg.ca [For Cana a]
ELECTRIC & GAS DRYER
SERVICE MANUAL
CAUTION
READ THIS MANUAL CAREFULLY TO DIAGNOSE
TROUBLES CORRECTLY BEFORE OFFERING SERVICE.
MODEL :
DLE5977W/DLG5988W
DLE5977B/DLG5988B
DLE3777W/DLG3788W

2
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.
!
WARNING !
WHAT TO DO IF YOU SMELL GAS:
IMPORTANT SAFETY NOTICE
The information in this service gui e is inten e for use by in ivi uals possessing a equate backgroun s
of electrical, electronic, an mechanical experience. Any attempt to repair a major appliance may result in
personal injury an property amage. The manufacturer or seller cannot be responsible for the
interpretation of this information, nor can it assume any liability in connection with its use.
RECONNECT ALL GROUNDING DEVICES
If groun ing wires, screws, straps, clips, nuts, or washers use to complete a path to groun are
remove for service, they must be returne to their original position an properly fastene .
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 groun connection point or unpainte
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 groun connection
point or unpainte metal in the appliance.
Avoi touching electronic parts or terminal contacts; han le electronic control assembly by e ges only.
When repackaging faile electronic control assembly in anti-static bag, observe above instructions.
■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 neighbor’s
phone. Follow the gas supplier’s instructions
carefully.
■If you cannot reach your gas supplier, call the fire
department.

3
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 LAY - OUT .........................................................................................................18
8. WIRING DIAGRAM ............................................................................................................19
9. DIAGNOSTIC TEST .............................................................................................................20
9-1. TEST 1 120VAC ELECTRICAL SUPPLY..........................................................................21
9-2. TEST 2 THERMISTOR TEST --- MEASURE WITH POWER OFF .......................................22
9-3. TEST 3 MOTOR TEST ................................................................................................23
9-4. TEST 4 MOISTURE SENSOR ....................................................................................24
9-5. TEST 5 DOOR SWITCH TEST ...................................................................................25
9-6. TEST 6 HEATER SWITCH TEST - ELECTRIC TYPE...........................................................26
9-7. TEST 7 GAS VALVE TEST - GAS TYPE .........................................................................27
10. CHANGE GAS SETTING (NATURAL GAS, PROPANE GAS) ...............................................28
11. DISASSEMBLY INSTRUCTIONS .........................................................................................30
12. EXPLODED VIEW ..............................................................................................................37
12-1. CONTROL PANEL & PLATE ASSEMBLY .......................................................................37
12-2. CABINET & DOOR ASSEMBLY...................................................................................38
12-3-1. DRUM & MOTOR ASSEMBLY : ELECTRIC TYPE ........................................................39
12-3-2. DRUM & MOTOR ASSEMBLY : GAS TYPE ...............................................................40
13. REPLACEMENT PARTS LIST.................................................................................................41
CONTENTS

44
SPECIFICATIONS
1
■Name : Electric an Gas Dryer
■Power supply : Please refer to the rating label regarding detailed
information.
■Size : 68.6X98.3X76.1 (cm)
■Dryer capacity : IEC 7.3cu.ft.
■Weight : 126 (Ibs)
Specifications are subject to change by manufacturer.
■ ACESSORIES
Dryer rack (1 each) Stacking kit (1 each)
Purchase Separately
Pe estal (1 each)
Purchase Separately
See page 6 for how to use. See page 7 for how to use. See page 8 for how to use.

5
Temperature
Moisture
High / Low / Off
Sensor
55
124 / 144
Door Trim
Top Plate
Color
lue WhiteChromate + STS Deco
PaintedPorcelain
lue White
120V / 240V 60Hz (26A)
POWER SUPPLY
LAMP
HEATER
MOTOR
55
79
7.3 cu.ft.
Electronic
GAS VALVE
5400W (22.5A)
55
250W (4.5A)
15 W (125mA)
13 W (110mA) x 2
ELECTRICITY
CONSUMPTION
lue White lack
Material &
Finishes
DLE3777WDLE5977W
DLG3788WDLG5988W
DLE5977
DLE5988
ITEM
Child Lock
Reversible Door
Interior Light
Product (WxHxD)
Packing (WxHxD)
Sound levels
Dryer Rack
Drum
No. of Dry Levels
No. of Dry Options
No. of Programs
DRUM CAPACITY
CONTROL TYPE
No. of Temperature Controls
Weight (lbs) : Net / Gross
AC 120V (GAS TYPE)
AC 240V (ELECTRIC TYPE)
Electrode sensor
Termistor
AC 120V
AC 120V
REMARK
Avaiable
Avaiable
Avaiable
Avaiable
Avaiable
Avaiable
27" x 42 3/4 x 28 1/3
29 1/2" x 44 3/4 x 30 3/4
Stainless Steel

6
FEATURES AND BENEFITS
2
INSTALLATION INSTRUCTIONS
3
DLE5977W/DLG5988W/DLE5977B/DLG5988B
DLE3777W/DLG3788W
Open the door.
Hold the dryer rack
with both hands.
Put the dryer rack into
the drum
Make sure that dryer is
evenly placed right onto the
drum inside and door rim.
123
Dryer Rack Installation Instructions

7
To ensure safe an secure installation, please observe the instructions below.
Place washer firmly on a stable, even an
soli floor as pro uct installation instructions
escribes in owner’s manual.
Peel protective paper off the tape from the
stacking kit si e bracket.
Fit the stacking kit si e bracket firmly to the
si e of top plate by attaching the ouble-
face tape to top plate as picture shows.
Secure stacking kit si e bracket to the
washer with a screw on the back of bracket.
Repeat Steps 2, 3, 4 for the other si e.
Place the ryer on top of the washer by fitting
legs as shown in the picture. Avoi finger
injuries - be careful not to pinch fingers
between the washer an ryer. Sli e washer
slowly backwar s to the stopper of kit.
Insert the front stacking kit. Push the front
stacking kit back to the stoppers of si e
stacking kit.
Screw both si es of the front kit.
• Do not use stacking kit with a gas ryer in
potentially unstable con itions like a mobile
home.
Stacking kit
Do not attempt installation with one person.
Incorrect installation proce ure can cause
serious acci ents an physical Injuries.
The weight of the ryer an the height of
installation makes the stacking proce ure
too risky for one person. This proce ure
shoul be performe by 2 or more
experience service personnel.
WARNING
1
2
3
4
5
6
7
Stacking Kit Installation Instructions

8
For washer, dryer, and combo LG 27”
25.4?
(64.5cm)
2.86?
(7cm)
18.7?
(47.5 cm)
27?
(68.6cm)
7.24
(18.4cm)
Pedestal Installation Instructions
4Attach the ouble-face tape of the bracket to the
ryer as shown so the bent parts of the brackets
align with the e ge an can be attache to the
pe estal with screws.
NOTE : Attach the lower si e first.
5Be sure to press the a hesive parts of the brackets
firmly to the appliance.
6Install the eight (8) screws(supplie ) to attach the
brackets to the pe estal.
7Move the ryer to the esire place.
NOTE : The appliance an pe estal assembly
must be place on a soli an level floor
for proper operation. A just the legs of the
appliance an pe estal by turning with a
wrench. Then, a just the lock unt towar
the pe estal while hol ing the pe estal leg
using a wrench.
1Remove pe estal, installation har ware, an
instructions from the shipping carton.
2Position ryer on top of the pe estal.
,
.
3Remove the paper from the
bracket.
for washer/
combo
for washer/
combo
for ryer
for ryer

9
Use the instructions at this section if your home has
a 3-wire receptacle (NEMA type 10-30R) and you
will be using a UL listed, 120/240 volt minimum,
30 amp, dryer power supply cord.
Review the following options to determine the appropriate electrical connection
for your home:
If this type is available at your home. you will be
connecting to a fused disconnect or circuit breaker
box
Important : use 4-wire connection in the places such
as mobile homes and areas where 3-wire connections
is not available.
Prepare minimum 5ft(1.52m) of length in order for
dryer to be replaced.
First, peel 5 inch (12.7cm) of covering material from
end. Make a 5 inch of ground wire bared. After cutting
1
1
/2inch (3.8cm) from 3 other wires. peel insulation
back 1inch (2.5cm). Make ends of 3 wires a hook
shape.
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.
Use the instructions at this section if your home has
a 4-wire receptacle (NEMA type 14-30R) and you
will be using a UL listed, 120/240 volt minimum,
30 amp, dryer power supply cord.
If this type is available at your home. you will be
connecting to a fused disconnect or circuit breaker
box
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.
5"
(12.7 cm)
31/2"
(8.6 cm)
1"1"
(2.5 cm)(2.5 cm)
5" 5"
(12.7 cm)
(12.7 cm)
1"
(2.5 cm)
3V2"
(8.9 cm)
3-wire direct
4-wire receptacle
(NEMA type14-30R)
3-wire receptacle
(NEMA type10-30R)
4-wire direct
5"5"
(12.7 cm)(12.7 cm)
31/2"
(8.6 cm)
1"
(2.5 cm)
5"
(12.7 cm)
1"
(2.5 cm)
3V2"
(8.9 cm)
4-wire connection : Direct wire
5"
(12.7 cm)
31/2"
(8.6 cm)
1" 1"
(2.5 cm)
(2.5 cm)
5" 5"
(12.7 cm) (12.7 cm)
1"
(2.5 cm)
3V
2
"
(8.9 cm)
f
b
e
c

10
Important : use 3-wire connection in the places
such as mobile homes and areas where 3-wire
connections is not available.
Prepare minimum 5ft(1.52m) of length in order for
dryer to be replaced.
First, peel 3 1/2inch (8.9cm) of covering material
from end and bare 1 inch from the ends.
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.
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.
5"
(12.7 cm)
31/2"
(8.6 cm)
1"
(2.5 cm)
5"
(12.7 cm)
1" 1"
(2.5 cm) (2.5 cm)
3V 3V2"
(8.9 cm) (8.9 cm)
3-wire connection : Direct wire
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.
f
b
e
c
• 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 4-
wire connection.
Option 1: 4-wire connection with
a Power supply cord.
e
b
c

11
1. Connect neutral wire(white) of power cord to
center terminal block screw.
2. Connect ground wire of appliance and neutral
wire of power cord to center terminal block
screw.
3. Connect red and black wire to the left and right
terminal block screws.
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.
5. Connect a independent ground wire from external
ground connector to proper ground.
e
b
c
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 2: 3-Wire Connection with
a Power Supply Cord
• 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.
c
b
Option 3: Optional 3-wire
connection.

12
3-2. Connect Gas Supply Pipe (Gas Dryer ONL )
2
3
5
1
4
1. Make certain your ryer is equippe for use with the
type of gas in your laun ry room. Dryer is equippe
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 ryer. Make sure you o not
amage the pipe threa 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 an
check all pipe connections (internal & external) for
gas leaks with a non-corrosive leak etection flui .
5. For L.P. (Liquefie Petroleum) gas connection, refer
to section on Gas Requirements.
For further assistance, 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

13
Time
DRYER CYCLE PROCESS
4
Cycle
HEAVY DUTY
3Hr
3Hr
Off Time: 6min
On Time: 10sec
Temperature Control for each cycle
HIGH
MID
HIGH
MEDIUM
LOW
LOW
ULTRA
LOW
(HIGH)
(MID
HIGH)
COTTON/
TOWELS
NORMAL
PERM
PRESS
DELICATES
ULTRA
DELICATE
SPEED DRY
FRESHEN UP
AIR DRY
-
(Normal)
(Normal)
(Normal)
(Normal)
(Normal)
(Normal)
-
-
-
54min Saturation
Saturation
Saturation
Saturation
Saturation
Saturation
Saturation
Saturation
55min
41min
36min
32min
34min
25min
20 min
30
min
(5min)
(5min)
(5min)
(5min)
(5min)
(5min)
(5min)
(5min)
N/A
68±4°C
66±4°C
60±4°C
52±3°C
52±3°C
45±3°C
(70±5°C)
(66±5°C)
No
heater
47±5°C
47±5°C
47±5°C
47±5°C
38±5°C
38±5°C
(47±5°C)
(47±5°C)
N/A Saturation
Load
Sensor
Dry *
Manual
Dry **
Default
Drying
Electro-
sensor
Temp-
Control
Default
time
Temp-
Control **
Cooling Wrinkle care
Conditions of operation and termination
Temp-
erature
Dry
Level
Display
time
Motor
Heater
* Sensor ry : “Dry Level” is set by users.
** Manual ry : “Temperature control” is set by users.
Default settings can be a juste by users.

14
When checking the Component, be sure to turn the power off, and do voltage discharge sufficiently.
COMPONENT TESTING INFORMATION
5
!
CAUTION
Component Test Procedure Check result Remark
1. Thermal cut off
• Check Top Marking :
N130
Measure resistance of terminal
to terminal
󳡉Open at 266 ±12°F
(130 ±7°C)
󳡊Auto reset -31°F (-35°C)
Same shape as Outlet Thermostat.
If thermal fuse is open must
be replace
󳡉Resistance value ≒∞
󳡊Continuity (250°F ) < 1Ω
• Heater case-
Safety
• Electric type
2. Hi limit Thermostat
(Auto reset)
Measure resistance of terminal
to terminal
󳡉Open at 257 ±9°F
(125 ±5°C)
󳡊Close at 221 ±9°F
(105 ±5°C)
󳡉Resistance value ≒∞
󳡊Resistance value < 5Ω
• Heater case -
Hi limit
• Electric type
3. Outlet Thermostat
( Auto reset)
• Check Top Marking :
N85
Measure resistance of terminal
to terminal
󳡉Open at 185 ±9°F
(85 ±5°C)
󳡊Close at 149 ±9°F
(65 ±5°C)
Same shape as Thermal cut off.
󳡉Resistance value ≒∞
󳡊Resistance value < 5Ω
• Blow housing -
Safety
• Electric type
4. Lamp hol er Measure resistance of terminal
to terminal
Resistance value :
80Ω ~ 100Ω
6. I ler switch Measure resistance of the
following terminal :
“COM - NC”
1. lever open
󳡉Resistance value < 1Ω
2. Lever push (close)
󳡊
Resistance value ≒∞
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)
󳡉Resistance value < 1Ω
󳡊Resistance value ≒∞
󳡉Resistance value ≒∞
󳡊Resistance value < 1Ω
The state that
Knob is
presse is
opposite to
Open
con ition.

15
Component Test Procedure Check result Remark
7. Heater Measure resistance of the
following terminal
󳡉Terminal : 1 (COM) - 2
󳡊Terminal : 1 (COM) - 3
󳡋Terminal : 2 - 3
󳡉Resistance value : 10Ω
󳡊Resistance value : 10Ω
󳡋Resistance value : 20Ω
• Electric type
8. Thermistor Measure resistance of terminal
to terminal
Temperature con ition :
58°F ~ (10~40°C)
58°F ~ 104F (10~40°C)
Resistance value : 10Ω • Heater case -
Hi limit
• Electric type
9. Motor • See Page 13
10. Gas valve valve 1
valve 2
Measure resistance of the
following terminal
󳡉Valve 1 terminal
󳡊Valve 2 terminal
󳡉
Resistance value : > 1.5kg ~
󳡊
Resistance value :
> 1.5~2.5kg
• Gas type
11. Igniter Measure resistance of terminal
to terminal
Resistance value : 100~800Ω • Gas type
12. Frame Detect Measure resistance of terminal
to terminal
󳡉Open at 370°F ((Maximum)
󳡊Close at 320°F
󳡉Resistance value ≒∞
󳡊Resistance value < 1Ω
• Gas type

16
Component Test Procedure Check result Remark
13. Outlet Thermostat
(Auto reset)
• Check Top Marking :
N95
Measure resistance of terminal
to terminal
󳡉Open at 203 ±7°F (95 ±5°C)
󳡊Close at 158 ±9°F (70 ±5°C)
󳡉Resistance value ≒∞
󳡊Continuity < 1Ω
• Gas type
• Gas funnel
13. Outlet Thermostat
(Manual reset)
• Check Top Marking :
N100
Measure resistance of terminal
to terminal
󳡉Open at 212 ±12°F
(100 ±7°C)
󳡊Manual reset
If thermal fuse is open must
be replace
󳡉Resistance value ≒∞
󳡊Continuity < 1Ω
• Gas type
• Gas funnel

17
MOTOR DIAGRAM AND SCHEMATIC
6
Contact On / Off by Centrifugal Switch
STOP MODE
(When Motor oes not operate)
RUN MODE
(Motor operates)
When checking Component, be sure to turn Power off, then do voltage discharge sufficiently.
NOTE
Centrifugal switch Centrifugal switch
(Pull Drive forward)

18
CONTROL LAY - OUT
7
PWB ASSEMBLY DISPLAY LAY-OUT
PWB ASSEMBLY LAY-OUT
MODEL DISPLAY AS DIAGNOSTIC TEST
MODEL
DLE5977W/B
DLG5988W/B
DLE3777W
DLG3788W
OP 1
X
X
X
X
OP 2
X
X
X
X
OP 3
X
O
X
O
OP 4
O
O
X
X
OP 5
X
X
X
X
OP 6
X
X
X
X
6871EC1115A
6871EC1115B
6871EC1115C
6871EC1115D
18:FO
19:FO
18:F1
19:F1
OPTION PART LED
DISPLAY P/No

19
ELECTRIC DRYER WIRING DIAGRAM
WIRING DIAGRAM
8
GAS DRYER WIRING DIAGRAM

20
ACTIVATING THE DIAGNOSTIC TEST MODE
1. Unit must be in Stan by (unit plugge in, isplay off)
2. Press “POWER” while pressing “MORE TIME”, an “LESS TIME” simultaneously.
DIAGNOSTIC TEST
9
Pressing the
“START/PAUSE”
button
CHECKING
ACTION DISPLAY CHECKING POINT REMARK
None
Once
Electric control
&
Temperature
sensor
Motor
Won’t power up
Defective LED
Thermistor open
Thermistor close
Motor runs
Displays Moisture Sensor Operation:
If moisture sensor is contacte with
amp cloth. The isplay number is
below 180, in normal con ition.
70 ~ 239
Measure
Moisture Value.
Twice
■
ELECTRIC TYPE
Motor + Heater 1
(2700W)
■
GAS TYPE
Motor + Valve
Current Temp.
■
ELECTRIC TYPE : Heater runs
■
GAS TYPE : GAS Valve runs
(Display the Temperature of
Insi e rum.)
During check,
If the oor is close .
Motor on & Heater
Off + Lamp Off 70 ~ 239
• Press Start button 1 time an then open the
oor. Procee again with the step 1(by pressing
start 1 time), step 2(by pressing start 2 times),
step 3(by pressing start 3 times) an step 4(by
pressing start 4 times) in sequence.
• Press Start 2 times an then open the oor. Procee
again from the step 1 all the way to the step 4.
• Press Start 3 times an then open the oor
Procee with the step 1 an skip the step 2 an
press step 3 twice an finish with step 4 by
making sure the all the electric evices shut off
in the en .
4 times Control Off Auto Off
3 times
■ELECTRIC TYPE
Motor + Heater 1
+Heater 2 (5400W)
■GAS TYPE
Motor Type
Current Temp.
(5 ~ 70)
During check,
If the oor is open.
Motor & Heater Off + Lamp On +
Buzzer beeps seven times
Door switch See test 6
Lamp
See test 1
Display : See page
See test 2
See test 3
See test 4
Gas valve
See test 7
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 )