LG DLE4970 Series User manual

1
ELECTRIC & GAS DRYER
SERVICE MANUAL
CAUTION
READ THIS MANUAL CAREFULL Y IN ORDER TO
PROPERL Y DIAGNOSE PROBLEMS AND TO SAFELY
PROVIDE QUALITY SER VICE ON THESE DR YERS.
U.S.A. Website: http://us.lgservice.com
Canadian Website: http://lg.ca
MODEL :
DLE4970*E DLG4971*E

2
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.
To reduce the risk of personal injury, adhere to all industry recommended safety procedures including the
use of long sleeved gloves and safety glasses. Failure to follow all of the safety warnings in this manual
could result in property damage, personal injury or death.
!
WARNING !
WHAT TO DO IF YOU SMELL GAS:
IMPORTANT SAFETY NOTICE
RECONNECT ALL GROUNDING DEVICES
IMPORTANT
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
3
CONTENTS
1. SPECIFICATIONS ............................................................................................................... 4
2. FEATURES AND BENEFITS ...............................................................................................6
3. INSTALLATION INSTRUCTIONS ........................................................................................6
4. DRYER CYCLE PROCESS ................................................................................................10
5. COMPONENT TESTING INFORMATION .........................................................................11
6. MOTOR DIAGRAM AND SCHEMATIC .............................................................................14
7. WIRING DIAGRAM ............................................................................................................15
8. FLOW SENSOR FUNCTION .............................................................................................16
8-1. FLOW SENSOR .......................................................................................................16
8-2. INSTALLATION CHECK ..........................................................................................17
8-3. TROUBLESHOOTING .............................................................................................18
9. DIAGNOSTIC TEST ..........................................................................................................19
9-1. TEST 1 120 VAC ELECTRICAL SUPPLY ...............................................................20
9-2. TEST 2 THERMISTOR TEST - MEASURE WITH POWER OFF ...........................23
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 TYPE ............................................27
9-7. TEST 7 GAS VALVE TEST - GAS TYPE ................................................................28
9-9. TEST 8 MOTOR ASSEMBLY, DC, PUMP ..............................................................29
10. CHANGE GAS SETTING (NATURAL GAS, PROPANE GAS) .......................................30
11. DISASSEMBLY INSTRUCTIONS ....................................................................................32
12. EXPLODED VIEW ............................................................................................................40
12-1. CONTROL PANEL AND PLATE ASSEMBLY .........................................................40
12-2-1. CABINET AND DOOR ASSEMBLY: ELECTRIC TYPE .......................................41
12-2-2. CABINET AND DOOR ASSEMBLY: GAS TYPE .................................................42
12-3-1. DRUM AND MOTOR ASSEMBLY: ELECTRIC TYPE .........................................43
12-3-2. DRUM AND MOTOR ASSEMBLY: GAS TYPE ...................................................44

4
[
1
SPECIFICATIONS
Name: Electric and Gas Dryer
Power supply: Refer to the rating label on the dryer.
Gas: 120 VAC Electric: 240VAC
Specifications are subject to change by manufacturer.
See page 6 of this manual for usage instruction.
Size: 27 X 28.9 X 45.3 (inch)
Dryer capacity: IEC 7.3 cu.ft.
Weight: 127.4 (Ibs)
Dryer rack (1 each)
Not on all models
*
OPTIONAL ACCESSORIES

5
Sound levels
3
5
ITEM DLE4970* DLG4971 REMARK
Blue White
Powder coating
Color
Top Plate
Door Trim
Power
Consumption
Motor
Elec.
Gas
Heater
Lamp
Gas Valve
AG Heater
Pump
Control Type
Drum Capacity
Weight (lbs) - Net
No. of Programs
No. of Dry Options
No. of Temperature Controls
Moisture
Temperature
No. of Dry Levels
Reversible Door
Drum
Dryer Rack
Child Lock
Interior Light
Product (WxDxH)
Sensor
Power
Supply
Material &
Finish
Spray
120 V / 60 Hz (11.5 A)
120 V / 240 V / 60 Hz (26 A)
120 V / 208 V / 60 Hz (23 A)
250W (4.5A)
5400W (22.5A)
15 W (0.2A)
13 W (0.11A) x 2
1100W (9.2A)
2.4W (0.15A)
Electronic
7.3 cu.ft.
127.4
14
6
5
5
Available
Available
Available
Stainless Steel
Available
Available
Available
27 x 28.9 x 45.3 (inch)
Packing (WxDxH) 29.8 x 31.3 x 47.24 (inch)
AC 120V
AC 240V(Electric Model)
DC 12V
DC 120V(Gas Model)
DC 120V(Steam Model)
DC 9V(Steam Model)
Thermistor
Electrode sensor

6
2FEATURES AND BENEFITS
3INSTALLATION 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.
COTTON/NORMAL

7
Use the instructions under option 1 if your home
homehas a 4-wire receptacle (NEMA type 14-30R).
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.
4-wire receptacle
Review the following options to determine
the appropriate electrical connection for
your home:
(NEMA type14-30R)
(NEMA type10-30R)
3-wire receptacle
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.
• If 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.
D
E
F
a
b
C
Option 1: 4-wire connection with
a Power supply cord.
If this type is available at your home. you will be
connecting to a fused disconnect or circuit breaker
box
If this type is available at your home. you will be
connecting to a fused disconnect or circuit breaker
box
3-wire direct
4-wire direct
5"
(12.7 cm)
1"
(2.5 cm)
5"
(12.7 cm)
3-1 Connecting Electric Dryers

8
A
B
C
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.
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.

9
9
2
3
5
1
4
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.
3-2 Connecting the Gas supply
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.
1New Stainless Steel Flexible Connector
- Use only if allowed by local codes (Use
Design A.G.A. Certied Connector)
21/8” N.P.T. Pipe Plug ( for checking inlet
gas pressure)
3Equipment Shut-O 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’ (6.1m) - Use
1/2” pipe
53/8” N.P.T. Gas Connection
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 LP (Liquefied Petroleum) gas connection, refer
to section on Gas Requirements.

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10
4DRYER CYCLE PROCESS
* Sensor dry: Dry Level is set by users.
** Manual dry: Temperature control is set by users.
Default settings can be adjusted by users.
Time
Cycle
HEAVY DUTY
3Hr
3Hr
Off Time: 6min
On Time: 10sec
Temperature Control for each cycle
MEDIUM
HIGH
NO
HEAT
MEDIUM
LOW
LOW
HIGH
HIGH
HIGH
HIGH
COTTON/
NORMAL
ANTIBACTE-
RIAL
PERM PRESS
CASUAL
DELICATES
SMALL LOAD
TOWELS
SPEED DRY
AIR DRY
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
Very
Dry
Normal
Adjustable
Normal
Adjustable
Normal
Adjustable
Normal
Adjustable
Normal
Adjustable
Normal
Adjustable
Off
Off
70min
54min
36min
41min
32min
55min
30min
25min
30min
5min
5min
5min
5min
5min
5min
5min
5min
5min
Saturation
Saturation
Saturation
Saturation
Saturation
Saturation
Saturation
Saturation
Saturation
68 4
155
°F
68 4
155
°F
52 3
126
°F
60 4
140
°F
52 3
126
°F
66 4
151 °F
68 4
155
°F
(68 4
(
155
°F)
NO
HEATER
47 5
113
°F
47 5
113
°F
47 5
113
°F
47 5
113
°F
47 5
113
°F
47 5
113
°F
47 5
113
°F
47 5
113
°F
N/A

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1. Thermal cut off Measure resistance of terminal
to terminal
Open at 284 41°F
(140 5°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 ) <1
Ω
•Heater case-
Safety
•Electric type
•Heater case -
Hi limit
•Electric type
•Blow housing -
Safety
•Electric type
Measure resistance of terminal
to terminal
Open at 257 9°F
(125 5°C)
Close at 221 9°F
(94
Measure resistance of terminal
to terminal
Open at 185 41°F
(85 5°C)
Close at 167 41°F
(75 5°C)
Same shape as Thermal cut off.
Measure resistance of terminal
to terminal
Resistance value
Resistance value <5
Ω
Resistance value
Resistance value <5 Ω
Resistance value < 1 Ω
Resistance value
Resistance value
Resistance value < 1 Ω
Resistance value:
80
Ω
~100
Ω
1. lever open
Resistance value <1 Ω
2. Lever push (close)
Resistance value
•Check Top Marking:
N140
2.Hi limit Thermostat
(Auto reset)
3.Outlet Thermostat
( Auto reset)
•Check Top Marking:
N85
4. Lamp holder
5. Door switch Measure resistance of the
following terminal
1) Door switch knob: open
Terminal: COM - NC(1-3)
Terminal: COM - NC (1-2)
2) Door switch push: push
Terminal: COM - NC (1-3)
Terminal: COM - NC (1-2)
6. Idler switch Measure resistance of the
following terminal:
COM - NC
!
CAUTION
5
COMPONENT TESTING INFORMATION
When checking the Component, be sure to turn the power off, and do voltage discharge sufficiently.
Component Test Procedure
Check result
Remark
7°C)

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12
5
7. Heater Measure resistance of the
following terminal
Terminal: 1 (COM) - 2
Terminal: 1 (COM) - 3
Terminal: 2 - 3
11. Igniter Measure resistance from
terminal to terminal.
12. Frame Detect
Measure resistance of the
following terminal
Valve 1 terminal
Valve 2 terminal
Measure resistance of termina
to terminal
Open at 370°F (Maximum)
Close at 320°F
8. Thermistor Measure resistance of terminal
to terminal
Temperature condition:
9. Motor • See Page 14
10. Gas valve
Resistance value: 10 Ω
Resistance value: 10
Ω
Resistance value: 20 Ω
Resistance value: 10
Ω
• Electric type
•Heater case
Hi limit
•Electric type
• Gas type
• Gas type
• Gas type
Resistance value: 50~800
Ω
Resistance value: > 1.5k
Ω
Resistance value: > 1.5~2.5k
Ω
Resistance value
Resistance value <1 Ω
valve 1
valve 2
Component Test Procedure
Check result
Remark
58°F ~ 104°F (10~40°C)

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13
13. Outlet Thermostat
(Auto reset)
14. Outlet Thermostatt
(Manual reset)
Measure resistance of terminal
to terminal
Open at 203 41°F (95 5°C
Close at 159 41°F (70 5°C)
• Gas type
• Gas funnel
• Gas type
• Gas funnel
Measure resistance of terminal
to terminal
Open at 230 41°F
(110 5°C)
Manual reset
Resistance value
Continuity <X
Ω
•Check Top Marking:
N95
•Check Top Marking:
N100
Resistance value
Continuity <X
Ω
Component Test Procedure Check result Remark

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14
6
MOTOR DIAGRAM AND SCHEMATIC
NOTE
When checking Component, be sure to turn Power off, then do voltage discharge sufficiently.
ƜContact On / Off by Centrifugal Switch
Ɯ .RUN MODE
(Motor operates)
Ɯ STOP MODE
(When Motor does not operate)
Motor
2 ~ 31
3 ~ 5
1
< 1 1
< 1 1
ᴾᴬ
ᴾᴬ
Terminal No
Mode
Centrifugal switch Centrifugal switch
(Pull Drive forward)
Resistance
Remark
Motor
STOP
Motor
RUN
Motor
Heater (Electric Models)
Heater (Electric Models)
Gas Valve (Gas Models)
Gas Valve (Gas Models)

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7~pypunGkphnyht
X\
Label all wires prior to disconnection when servicing controls. Wiring
errors can cause improper and dangrous operation. Verify proper
operation after servicing.
CAUTION
ELECTRIC DRYER WIRING DIAGRAM
GAS DRYER WIRING DIAGRAM

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8FLOW SENSOR FUNCTION
This FlowSense
TM
function detects the clogging or blocking of ducts.
Clogged duct vents or hoses decrease efficiency in drying clothes. Clogged vents can also cause fire.
This function alarms you, when to clean the ducts.
When the alarm about duct clogging is on display of the panel, your duct vents should be cleaned by
yourself or serviceman.
8-1 Flow sensor
Flow Sensor Function

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8-2 Installation check
Once you have completed the installation of the dryer,
use this test to make sure the condition of the exhaust
system is adequate for proper operation of the dryer.
This test should be performed to alert you to any serious
problems in the exhaust system of your home.
™, an innovative sensing
system that automatically detects blockages and
of lint buildup and free of restrictions allows clothes to
dry faster and reduces energy use.
Do not load anything in the drum for this test, as in
may aect the accuracy of the results.
This button sequence activates the installation test.
The code will display if the activation is
successful.
The dryer will start the test, which will last about
two minutes. The heat will be turned on and the
temperatures in the drum will be measured.
During the three minute test cycle, monitor the
Flow Sense™ display on the control panel. If no bars
are displayed, when the cycle ends, the exhaust
system is adequate. If the exhaust system is severely
restricted, the display will show four bars. Other
problems may also be shown with error codes. Refer
to the next page for error code details and solutions.
Four bars indicates that the exhaust system is severely
restricted. Have the system checked immediately, as
performance will be poor.
At the end of the test cycle, will display.
The test cycle will end and the dryer will shut o
automatically after a short delay.
Restricted
NOTE
The dryer should be cool before starting this test. If
the dryer was warmed up during installation, run the
AIR DRY cycle for a few minutes to reduce the interior
temperature.

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8-3 Troubleshooting for flow sensor dryer
• Check the Error Code before you call for service
Error Code Possible Causes Solutions
tE1
or
tE2 • Temperature sensor failure•
HS • Humidity Sensor failure.•
PS
or
PF
or
nP
• Electric dryer power cord is not
connected correctly, or house power
supply is incorrect.
• House fuse is blown, circuit breaker has
tripped, or power outage has occurred.
• Check the power supply or the connection of
power cord to the terminal block. Refer to the
Connecting electric dryers section of this
manual for complete instructions.
• Reset circuit breaker or replace fuse. Do not
increase the fuse capacity. If the problem is a
circuit overload, have it corrected by a quali-
The display Do not use the dryer until the exhaust
system has been cleaned and/or repaired.
Using the dryer with a severely restricted exhaust
property damage.
Check the outside dryer vent while the dryer is
.
If ther exhaust system is extremely long, have it
repaired or rerouted.
Keep the area around the dryer clean and free
of clutter.
Check the vent hood for damage or lint clogging.
Make sure the area around the vent hood is clear.
FLOW SENSE
TM
indicator shows
four bars during
the drying cycle
or the display
drying.
many turns/restrictions.
ductwork due to lint buildup or
debris.
restriction in the external dryer
venting.
Install a shorter or straighter duct run. See the
Instructions.
Ductwork should be checked/cleaned soon.
Dryer can be used in this condition, but drying
times may be longer.
TM
If exhaust restrictions are sensed by the
FLOW SENSE system, the indicator will remain
on for two hours after the end of the cycle.
Opening the door or pressing the POWER button
noitidnoctcudehtkcehC•
If the FLOW SENSE
TM
LED is turned on, check the
exhaust system for restrictions and damage. Repair or
replace the exhaust system as needed.
Avoid long runs or runs with multiple elbows or
bends.
Excess or crushed
transition duct
Too many elbows or
exhaust too long
Check for blockages and lint buildup.
Make sure the ductwork is not crushed or restricted.
Crushed or
damaged
exhaust
Lint buildup
or blockage

19
9
DIAGNOSTIC TEST
19
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.
3. Press START/PAUSE button to advance through diagnostics.
To check pump operation:
At the fourth press of the test mode, if the AD value of the pump is higher than 10 on the display, the pump is normal.
If it is lower than 10, E5 error will be displayed.
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 )
Pressing the
START/PAUSE
None
Standard
Thermistor opentE1
PGM Ver (8E8-V008E8)V00
8E9 (Elec Type)
898 (Gas Type)
Thermistor shortedtE2
AG Thermistor open or shortedtE4
Pump Error
Pump runs
E5
Power off
OO
Motor runs
Displays Moisture Sensor Operation
If moisture sensor is contacted with
damp cloth. The display number is
below180innormalcondition
30 = High
moisture
239 = Low
moisture
Current Temp.
(5~70)
Current Temp.
(5~70)
Pump AD valve
(11~255)
Electric control
&
Temperature sensor
ELECTRIC TYPE
Motor+Heater1(2700W)
GAS TYPE
Motor
ELECTRIC TYPE
Motor+Heater1+Heater2
(5400W)
GAS TYPE
Motor+Gasvalve
Once Motor+Controller
Motor, Pump, Heater2 off
Loads, Controller off
Motor+Pump+
Heater2 (runs for 1sec)
(Heater1 off)
Twice
3 times
4 times
5 times
6 times
CHECKING
ACTION DISPLAY CHECKPOINT
ELECTRIC TYPE Heater 1 is energized
- 2700 W
GAS TYPE Valve not energized
(Temperature in the drum is displayed in
degrees C.)
ELECTRIC TYPE: Heater 1 and heater
2 are energized - 5400 W
GAS TYPE: Gas valve is energized
(Temperature in the drum is displayed in
degrees C.)

20
112
Test 1
120V AC Electrical Supply
When measuring power, be sure to wear insulated gloves, to and avoid an
electric shock
No power was applied to controller. (LED, LCD Display off)
With dryer power on; connector linked to controller.
Check the outlet, is the voltage
110V ~ 125V AC?
Check if the voltage measured between
connector BK2 or WH2- (Black Wire)
linked to the Controller and BL2-
(White Wire) Is 110~125V?
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?
Replace controIler.
•Reconnect the
controller.
•Check if Power
Cord is properly
connected.
•Check the fuse
or circuit breaker
YES
NO
NO
NO
YES
YES
L (Black) L (Red)
N (White)
BK2 or WH2 BL2-
BK WH
Caution
Trouble Symptom
Measurement Condition
20