LG XD3 25U Series User manual

DISHWASHER
SERVICE MANUAL
NOTE
For Authorized Service Technicians
CONFIDENTIAL
MODEL : XD3*25U** / XD4*24U**


Any reproduction or duplication (including by way of email, facsimile or other electronic means),
publication, modification, copying or transmission of this Service Manual is STRICTLY PROHIBITED unless you
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Manual. The material covered by prohibition includes, without limitation, any text, graphics or logos in this
Service Manual.
Copyright ⓒ 2017 LG Electronics Inc. All rights
reserved. Only for training and service purposes.

For Authorized Service Technicians
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CONTENTS
 
 
 

 

 



 

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...1
... 1
MAIN PCB...2
DISPLAY PCB.........3

...4

...4
..5
..7

...9
..9
..80
..2

For Authorized Service Technicians
- 4 -
- 4-
DISCONNECT POWER SUPPLY LINE BEFORE SERVICING
RECONNECT ALL GROUNDING DEVICES
IMPORTANT SAFETY NOTICE
This service information is intended for individuals
possessing adequate backgrounds of electrical,
electronic and mechanical experience.
Any attempt to repair this appliance may result in
personal injury and property damage.
The manufacturer or seller can not be responsible
for the interpretation of this information, nor can it
assume any liability in connection with its use.
CAUTION
1. IMPORTANT SAFTY NOTICE

For Authorized Service TechniciansFor Authorized Service T
- 5 -
2. SPECIFICATIONS
ITEM SPECIFICATION
 
 
 

 
 

 

 
 
 
 
 
 
 
 

 

 

 

 
 
 
 
 
 

For Authorized Service Technicians
- 6 -
3. FEATURES AND OPERATION
PRODUCT FEATURES
QuadWash™ System
Multi-Motion lower spray arm shoots water in various directions and at optimized intensities to reach every area of the tub.
This system provides more powerful and complete cleaning coverage.
Inverter Direct Drive Motor
LG's experience in motor technology results in extraordinary functionality, with advanced features like the Dual Zone option,
The simple design and high build quality of the motor make it so reliable that it's covered for 10 years under the warranty.
EasyRack Plus
various shapes and sizes.
Smart ThinQ™
Download the new LG smart phone app to set options, self-diagnose and troubleshoot problems with the appliance, and
other useful features. Some of these functions use Wi-Fi or NFC (Near Field Communication) technology and require an
NFC-equipped smart phone.

For Authorized Service TechniciansFor Authorized Service T
- 7 -
Control Panel

For Authorized Service Technicians
- 8 -
Control Panel
Control Panel Features
a Power
•Press Power button to turn power on and off.
•After the cycle is complete, the power automatically turns off for purposes of safety and economy.
•If there is a power surge, power outage, or disruption of any kind, power is automatically turned off
for safety.
•When power is connected again, it will turn on automatically and resume the cycle.
b Display
• 8:88 : Digital Display
-The digital display on the control panel shows the ESTIMATED cycle time. When the cycle and
options are selected, the display shows the total estimated time to complete those selections.
During operation, the display shows the remaining estimated operating time.
-The estimated time shown on the display does not include delay times for heating water, etc.
- If
Delay Start is selected, the display shows the delay time in hours.
-The
Auto cycle time may vary depending on the soil level of your load.
•
e : Rinse Aid Icon
-This icon flashes when the rinse aid level is low. The LED automatically shuts off when the rinse aid
is refilled or the level is set to 0.
•
a : Machine Clean Icon
-This icon flashes after every 30 cycles.
-To activate or deactivate the icon, press the
Delicate button for 3 seconds.
•
f : Wi-Fi
-When the appliance is connected to the internet through a home Wi-Fi network, this icon
illuminates.
•
n : Salt Refill Icon
-This icon flashes when the salt level is low. The LED automatically shuts off when the salt is refilled.
c Chime On/Off

For Authorized Service TechniciansFor Authorized Service T
- 9 -
•To activate or deactivate the button sounds, press and hold
Dual Zone
and
Energy Saver
simultaneously for 3 seconds. The error alert sound cannot be turned off.
d Cancel
•The drain pump activates and the cycle cancels. Once the appliance finishes draining, the power
turns off.
•Press and hold
Start button for 3 seconds to activate the cancel function.
e Start
•To operate the appliance, either (depending on display type) press Start button and close the door
or close the door and press
Start button.
•If
Start button is not pressed to start the cycle within 4 minutes, the power will automatically turn off.
Wash Cycles
Auto
This cycle senses the soil amount and water clarity
and optimizes the wash to achieve the best
cleaning. The wash time may vary depending on
the soil level.
Intensive
This cycle is for heavily soiled dishes and dishes
with hardened on soil. This cycle defaults to the
strongest spray intensity and uses it to wash
heavily soiled dishes.
Delicate
Use this cycle to clean delicate items such as fine
china and stemware.
Refresh
This cycle freshens up and warms dishes that have
been unused for a long time.
•Do not use detergent when using this cycle.
Eco
It provides the most efficient energy and water
consumption for a good washing result and drying
result on a normally soiled load and as it uses very
little energy.
•
Eco cycle and the Energy Saver option are
suitable for a normally soiled load.
Turbo
This cycle will clean moderately soiled dishes using
slightly more energy and water.
•
Extra Dry is set to on as default. If you do not
want to dry dishes after washing, turn off the
Extra Dry
option. Not drying the dishes will
result in a shorter cycle time.
Download Cycle
Use a dedicated cycle downloadable via Wi-Fi or
NFC. (depending on model).
NOTE
•Only the cycle code for the currently downloaded
cycle appears on the appliance. See the
smartphone app for cycle codes, names, and
more information about the available cycles.
-Default Cycle: P1. Pots & Pans
Machine Clean
This cycle is for cleaning the inside of the appliance.
Use the cycle without dishes in the appliance. It
eliminates residual soils, odor, white spots,

For Authorized Service Technicians
- 10 -
limescale, and other dirt. Add citric acid or another
cleaning agent for more effective results.
•Press and hold
Intensive for 3 seconds to
activate.
Rinse
This cycle is a quick rinse only for dishes that will
not be washed immediately. The cycle rinses dishes
that have excess soil to soften dried on residue.
Rinsing the dishes helps prevent odors in the
appliance.
•Press and hold
Eco for 3 seconds to activate.
NOTE
•Do not use detergent with the this option.
•This cycle does not have drying.
Express
This cycle will quickly clean lightly soiled dishes.
•Press and hold
Turbo
for 3 seconds to activate.
NOTE
•This cycle does not have drying. Select the Extra
Dry
option or another cycle for better drying.
Extra Dry
will add to the overall cycle time.
•Detergent tablets are not recommended for use
of
Express cycle. If the detergent tablets are
used, it may cause detergent residue on dishes
due to the relatively low rinse temperatures.
Options and Extra
Functions
Select the desired cycle button and then select the
options for that cycle. For more information, see
the
Cycle/Option Guide section.
Dual Zone
This option automatically sets the spray intensity to
soft for the upper spray arm and strong for the
lower spray arm. Place heavily soiled dishes like
plates and bowls in the lower rack and lightly soiled
dishes like cups and small plates in the upper rack
to get the best results.
Half Load
This option washes intensively by selecting the
upper or lower racks. For small loads, use just the
upper or lower rack to save energy and time. By
pressing the
Half Load
button, the settings
f
(Upper),
g
(Lower) and the cancellation of the this
option are available.
Energy Saver
This option saves energy by reducing the wash and
rinse temperatures. Wash time is increased to
maintain wash results. Do not use this cycle with
heavily soiled dishes.
Steam
This option adds steam during the cycle to improve
wash results.
High Temp
Raises the main wash or heating rinse temperature
to improve cleaning.
•A chime will sound to alert you of any residual
temperatures inside the appliance. Wait for the
appliance to completely cool down before
opening the door.
Extra Dry
Select this option for better drying results. This
option adds extra drying time to the cycle and
raises the heating rinse temperature.
•When the rinse aid is empty, this option is
selected automatically.

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Delay Start
This feature delays the start of a selected cycle.
Each time the
Delay Start
button is pressed, the
delay time increases by an hour. The delay time can
be set from 1 to 12 hours, in one-hour increments.
•To cancel this feature, turn the power off.
•To change the cycle and cycle option, open the
door and then select another cycle and cycle
option. The countdown will continue.
Control Lock
This feature helps prevent settings from being
changed during a cycle. Selecting this feature locks
all of the buttons, except for the
Power button, on
the control panel. This feature does not lock the
door.
•On models with the external display, while a
cycle is running, press and hold
Half Load and
Energy Saver simultaneously for 3 seconds to
activate or deactivate this feature. On models
with a concealed display, open the door during
operation and follow the same instruction.
•When this feature is activated, the display code
CL will show on the display.
•To start a new cycle, deactivate this feature.
•This feature can be set at any time by turning on
the appliance.
Wi-Fi
Press and hold Delay Start for 3 seconds to
connect to the network. Refer to
SMART
FUNCTIONS
sections for detailed information
about this feature.
Auto Open Dry
This feature may vary depending on the model
purchased.
The door will open automatically at the end of a
programme that includes drying in order to
enhance drying results.
•To activate or deactivate this feature, press and
hold the
Energy Saver
button and the
High
Temp
button simultaneously for 3 seconds.
•This feature is not available when the
Machine
Clean
and
Rinse
cycle is selected.
•When you select the
Download Cycle
, this
feature may operate even if the feature is
deactivated. Because the
Download Cycle is
designed to achieve the best results in a specific
purpose regardless of appliance settings.
•The display shows whether this feature is on or
off.
WARNING
•Keep children away from the appliance while the
appliance is operating. Exposure to high
temperature steam may cause scalding or
burns.
SignaLight™
This feature may vary depending on the model
purchased.
SignaLight™ shows the status of the appliance,
whether it has encountered any problems,
whether it is operating normally, or whether it is
ready to wash dishes.
•Depending on the model, the lamp may be
located either on the front of the appliance or
the top of the door.
Red (left)
The red lamp flashes when the appliance
encounters an error. For more information about
the error, see the
Error Code part of the
TROUBLESHOOTING section.

For Authorized Service Technicians
- 12 -
White (middle)
The white lamp flashes when you select an option
cycle or when a cycle has been paused.
•The white lamp lights up when a cycle is running.
Green (right)
The green lamp lights up when a cycle is finished.
When the door is opened, the lamp turns off.
Turn the power on, and then press and hold the
High Temp
button for 3 seconds until
ON
shows on
the display.
•The default setting is on
OFF . When OFF shows
on the display, the green lamp stays on for 90
seconds after the cycle has finished.
•You can set the lamp setting to
ON on the display
so that the dishwasher keeps the green lamp on
until the door is opened manually. (and the
Auto
Open Dry
feature is set to OFF).

For Authorized Service TechniciansFor Authorized Service T
- 13 -
3-3. TEST MODE
BUTTON
Times
button is
pushed
Top
Display
Load and Checking points Door
open/
closed
Remark
Load LED lighting
POWER
+AUTO
+START
1 Time
A**/
d**/U**
(Version)
Power Button
is lighting.
Rinse Aid &
Salt
Rell LEDs
are Flashing.
(If needed to
fulll a Rinse
aid) other
LEDs are
turned o
Either
"nC" Will be
displayed when NFC
or Wi Module is
Failure.
Start
1 Time Sump
Temp()Dispenser
Closed
"EE" will be
displayed when
EEPROM is Failure.
2 Times Soil level Soil Sensor
Closed
3 Times Drain
Motor RPM Drain Motor Either
Drain water from
sump
to drain hose
4 Times Frequency
Inlet Valve
+ Solenoid
Valve(Water Jacket)
Closed Supply water from
inlet hose
5 Times n06 Solenoid
Valve(Water Jacket) Closed Drain water from water jacket to sump
6 Times n07 Solenoid
Valve(Softener) Closed
7 Times Washing
Motor RPM Washing Motor Closed
Operate washing
motor
8 Times Washing
Position
Washing Heater +
Vario Valve Closed
Un : Detecting Washing
Position
Lo : Detecting
Complete "nE" Will be
displayed when Vario
Valve is failure.
9 Times - Power O All LEDs are
turned o
Closed
 
 

 

CHECK PROGRAM

For Authorized Service Technicians
- 14 -
  



   
  
  
  
  
  
  
  
 
 
  
7 seconds is suitable for Regen Water Supply

For Authorized Service TechniciansFor Authorized Service T
- 15 -
4. PARTS AND SPECIFICATIONS
NOTE
• Appearance and specifications may change without notice to improve the quality of the appliance.
Front View
a Control Panel & Door Handle
b Front Cover
c Levelling Feet
d Power Cord
e Water Supply Hose
f Drain Hose
Interior View
a Top Wash Impeller
b Upper Spray Arm
c Lower Spray Arm
d Salt Container Cap
e Filtration System
f
Detergent and Rinse Aid Dispenser
g Steam Nozzle
*1
h Lower Rack
i Upper Rack
j Cutlery Rack (on some models)
Cutlery Basket (on some models)
*1 This feature is only available on some models.

For Authorized Service Technicians
- 16 -
Programme Guide (model dependent)
Programme Soil Level
Wash Rinse
Dry
Pre wash Main wash Rinse Heating
rinse
Auto All levels (50 - 55 °C) (70 °C)
Intensive Heavy (75 °C) (70 °C)
Delicate Light (45 °C) (70 °C)
Refresh (75 °C)
Eco Moderate (53 °C) (70 °C)
Turbo Moderate (65 °C) (65 °C)
Express Light (45 °C) (60 °C)
Rinse Light
Machine
Clean (50 °C) (70 °C)
•Running time may vary according to the water temperature, ambient temperature, water pressure and voltage.
•When the Auto Open Dry(AOD) feature is activated, the heating rinse temperature will be changed to
between 60~70℃
Available Options
Programme
Options
Dual
Zone Half Load Energy Saver Steam High Temp Extra Dry Delay Start
Auto
Intensive
Delicate
Refresh
Eco
Turbo
Express
Rinse
Machine
Clean
Download
Cycle
•The Energy Saver option is not available with the High Temp or Extra Dry option.
5. PROGRAMME TABLE

For Authorized Service TechniciansFor Authorized Service T
- 17 -

 
 
 
 
 
 
※ If you need to lay down the appliance, You must drain water by using test mode from water jacket to avoid the floor wet in
numerical order below
① After entering test mode, press Start button 5times(n06) and wait more than 60 seconds to drain water from water jacket to
sump.
② After step①, turn off the appliance. And after entering test mode, press Start button 3times and wait until water is completely
drained.
1-1. Top Cover
B
C
A
 
 
 
1-2.Side Cabinet-R/L & Tub Felt
B
C
A
 
 
 

 

 




6. HOW TO DISASSEMBLE

For Authorized Service Technicians
- 18 -
2-1. Front Cover
①Open the door.
② Remove 6 screws(Stainless) around
front cover assembly.
③ Close the door slowly and remove front
cover downwards.
2-2. Control Panel Assembly
①Open the door.
② Remove 6 screws(stainless).
③ Remove the wire connection.
④ Remove the handle.
2-3. Panel Handle
Hook
Hook
Hook
Screw
driver
Hook
① Pull the handle forward to separate
front hook.
②Push the 2hooks.(Left & Right)
③ Remove the handle.

For Authorized Service TechniciansFor Authorized Service T
- 19 -
2-4. Door Liner Assembly
ྚ ྛ ྛྚ
④ ④ ⑤ ⑤


 
 

 

 
 








① ②
③ ④

 

 

 

 
 

 

For Authorized Service Technicians
- 20 -
2-5. Door Spring
①
③
②
④
Roller rope spring

 
 
 
2-6. Door Liner
④
①②~③
Rope Holder

 
 
 
 

 