LG DLG5988WM User manual

Website:http://www.LGservice.com [For U.S.A]
www.lg.ca [For Canada]
ELECTRIC & GAS DRYER
SERVICE MANUAL
CAUTION
READ THIS MANUAL CAREFULLY TO DIAGNOSE
TROUBLES CORRECTLY BEFORE OFFERING SERVICE.
MODEL :
DLE5977W/DLG5988W
DLE5977B/DLG5988B
DLE3777W/DLG3788W
DLE5977WM/DLG5988WM
DLE5977SM/DLG5988SM

Apr. 2004 PRINTED IN KOREA P/No.:3828EL3005A

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 guide is intended for use by individuals possessing adequate backgrounds
of electrical, electronic, and mechanical experience. 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.
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.
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.
■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 and 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)
Purchased Separately
Pedestal (1 each)
Purchased 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
Blue WhiteChromate + STS Deco
PaintedPorcelain
Blue 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
Blue White Black Titanium
Material &
Finishes
DLG3788W
DLG5988W
DLG5988B
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 3/4x 28 1/3
29 1/2" x 44 3/4x 30 3/4
Stainless Steel
DLE5977WM
DLE5988WM
DLE3777W
DLE5977W
DLE5977B
DLE5977S
DLG5988S
DLE5977SM
DLG5988SM

6
FEATURES AND BENEFITS
2
INSTALLATION INSTRUCTIONS
3
DLE5977W/DLG5988W/DLE5977B/DLG5988B/DLE5977WM/DLG5988WM/DLE5977SM/DLG5988SM
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 and secure installation, please observe the instructions below.
Place washer firmly on a stable, even and
solid floor as product installation instructions
describes in owner’s manual.
Peel protective paper off the tape from the
stacking kit side bracket.
Fit the stacking kit side bracket firmly to the
side of top plate by attaching the double-
faced tape to top plate as picture shows.
Secure stacking kit side bracket to the
washer with a screw on the back of bracket.
Repeat Steps 2, 3, 4 for the other side.
Place the dryer on top of the washer by fitting
legs as shown in the picture. Avoid finger
injuries - be careful not to pinch fingers
between the washer and dryer. Slide washer
slowly backwards to the stopper of kit.
Insert the front stacking kit. Push the front
stacking kit back to the stoppers of side
stacking kit.
Screw both sides of the front kit.
• Do not use stacking kit with a gas dryer in
potentially unstable conditions like a mobile
home.
Stacking kit
Do not attempt installation with one person.
Incorrect installation procedure can cause
serious accidents and physical Injuries.
The weight of the dryer and the height of
installation makes the stacking procedure
too risky for one person. This procedure
should be performed by 2 or more
experienced service personnel.
W ARNING
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 double-faced tape of the bracket to the
dryer as shown so the bent parts of the brackets
align with the edge and can be attached to the
pedestal with screws.
NOTE : Attach the lower side first.
5Be sure to press the adhesive parts of the brackets
firmly to the appliance.
6Install the eight (8) screws(supplied) to attach the
brackets to the pedestal.
7Move the dryer to the desired place.
NOTE : 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.
1Remove pedestal, installation hardware, and
instructions from the shipping carton.
2Position dryer on top of the pedestal.
,
.
3Remove the paper from the
bracket.
for washer/
combo
for washer/
combo
for dryer
for dryer

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"
(2.5 cm)
5"
(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"
(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"
(2.5 cm)
5"
(12.7 cm)(12.7 cm)
1"
(2.5 cm)
3V
2
"
(8.9 cm)
f
b
e
d
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"
(2.5 cm)
3V2"
(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
d
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
d
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
d
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
d
Option 3: Optional 3-wire
connection.

12
3-2. Connect Gas Supply Pipe (Gas Dr yer ONLY)
2
35
1
4
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.
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 dry : “Dry Level”is set by users.
** Manual dry : “Temperature control”is set by users.
Default settings can be adjusted 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 replaced
󳡉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 holder Measure resistance of terminal
to terminal
Resistance value :
80Ω~ 100Ω
6. Idler 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
pressed is
opposite to
Open
condition.

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 condition :
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 replaced
󳡉Resistance value ≒∞
󳡊Continuity < 1Ω
•Gas type
•Gas funnel

17
MOTOR DIAGRAM AND SCHEMATIC
6
Contact On / Off by Centrifugal Switch
STOP MODE
(When Motor does 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
DLE5977WM/SM, DLE5977W/B
DLG5988WM/SM, 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
RLM ELECTRIC DRYER WIRING DIAGRAM ELECTRIC DRYER WIRING DIAGRAM
WIRING DIAGRAM
8
RLM GAS DRYER WIRING DIAGRAM GAS DRYER WIRING DIAGRAM
ELECTRONIC CONTROL
SAFETY THERMOSTAT
HI-LIMIT THERMOSTAT
BLOWER THERMOSTAT
OVERLOAD PROTECTOR
DOOR SWITCH
GRAY
GRAY
LAMP
NC
NO
BL2
BL4
YL2 WH3
RD3
WH3 BL3
COM
WHITE
PLC MODEM
BLACK
N WHITE
WHITE
YELLOW
RED
THERMISTOR
MOISTURE SENSOR
DC VALVE1
FLAME DETECTOR
IGNITER
MOTOR
NC NO
BELT SWITCH
DC VALVE2
L1 BLACK
GN/YL
POWER CORD
BROWN
BROWN
GRAY
BLUE
WHITE
BLUE BLUE
BLUE
ORANGE
RED
RED
RED
PINK
PINK
YELLOW
CENTRIFUGAL
SWITCH
1 2
23
1
1
3
2
3
1
2
1 3
2 41221
2
1
3
2 3 7 9
2 3
13 2 13 2 1 3 5 6
1 2 1 2
2 1 2 1
BLUE
8 7 6 5 4 3 2 1
ELECTRONIC CONTROL
HI - LIMIT THERMOSTAT
RD3
WH3
WHITE
RED
BLACK
PLC MODEM
N WHITE
L2
WHITE
BLOWER
THERMOSTAT
RED
YELLOW
HEATER
BLUE
RED
BELT SWITCH
L1 BLACK
BROWN
WHITE
INNER COIL
OUTER COIL
BLUE
YELLOW
RED
BROWN
BL2
DOOR SWITCH
GRAY
LAMP
NC
NO
COM
1 2
23
1
1
3
2
3
1
2
12
1 2 3
OVERLOAD PROTECTOR
MOTOR
CENTRIFUGAL
SWITCH
SAFETY
THERMOSTAT
21 3 7
10
RED
ORANGE
BLUE
1 3 5 6
2 1 2 1
THERMISTOR
MOISTURE SENSOR
WH3
RD3
1 2 33 2 1
BL4
1 3
2 4
8 7 6 5 4 3 2 1