LG D1420WF User manual

DISHWASHER
SERVICE MANUAL
BEFORE SERVICING THE UNIT, PLEASE READ THIS MANUAL CAREFULLY
FOR SAFETY AND CORRECT SERVICES.
NOTE
MODEL : D1420W(L,M,T,B,C,D,A)F
D1421W(L,M,T,B,C,D,A)F
D1422W(L,M,T,B,C,D,A)F
D1423W(L,M,T,B,C,D,A)F
D14131WF / D14135LF
D14138AC / D14121WH
LD-4321W / LD-4421M
LD-4421PV / LD-4421NV
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- 3 -
1. CAUTION......................................................................................................................... 4
2. SPECIFICATIONS ........................................................................................................... 5
3. PARTS NAME.................................................................................................................. 6
4. FEATURES & TECHNICAL EXPLANATION ................................................................... 7
5. WIRING DIAGRAM...................................................................................................... 12
6. PROGRAM CHART (SCHEMATIC DIAGRAM)............................................................ 13
7. HOW TO DISASSEMBLE ............................................................................................ 14
8. TROUBLE SHOOTING METHODS.............................................................................. 27
A. TROUBLE SHOOTING ACCORDING TO DISPLAYED ERROR MESSAGE.......... 27
B. TROUBLE DIAGNOSES AND REPAIR BY SYMPTOM........................................... 29
9. INSTALLATION INSTRUCTION ................................................................................... 33
10. EXPLODED VIEW .......................................................................................................37
CONTENTS

- 4 -
DISCONNECT POWER CORD 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 !

- 5 -
2. SPECIFICATION
Rated Voltage / Frequency AC 220V/50Hz AC 230V/50Hz AC 240V/50Hz
Installation Freestanding
Place Settings 14
Product Dimension(mm)
600(W) 600(D) 850(H)
Product Weight(Kg) 60kg
Color White / Luxury Silver / Titanium / STS
Black / ACM / Dark Red / Perl Silver
Tub Material Stainless Steel
Control Electronic
Rated Power(Watt) 1,534 1,670 1,812
Heater Power(Watt) 1,464 1,600 1,742
Programs 6
Rack Nylon Coating
Upper Rack Adjustable type
Lower Rack D1420 / D1421 / D1423 : 50% Fold down, Removal type
D1422 : 50% Fold down
Water Consumption 14 (Eco)
Power Consumption (kWh) 1.08 (Eco)
Operating Time (min) 199
Fan Dry System Yes
Delay Start Function Yes
Auto-Off Power Switch Yes
Process Monitor Yes
Wash Level 5
Operating Water Pressure (Bar) 0.5 ~ 8
ITEM SPECIFICATION

- 6 -
3. PARTS NAME
1. Control Panel
2. Door Handle
3. Front Cover
4. Lower Cover
5. Display Window
6. Power Button
7. Drain Hose
8. Inlet Hose
9. Power Cord
10. Adjustable Leg
11. Upper Rack
12. Cutlery Rack
13. Detergent And Rinse Aid Dispenser
14. Vapor Vent Cover
15. Upper Spray Arm
16. Lower Spray Arm
17. Filter ASM
18. Lower Rack
19. Salt Container Cap
20. Cutlery Rack
The appearance and specifications may vary without notice.
Funnel

4. FEATURES & TECHNICAL EXPLANATION
4-1 New Technology Introduction
• During the high temp. Rinse course, water
temperature in an dishwasher reaches 80°C,
considerably higher than the average rinse
temperature in conventional
dishwashers(65°C). This is how Rinse 80°C
can eliminate some bacteria such as
salmonella.
4-1-1. High Temperature Rinsing (Extra Hot function)
• With the Dual Wash System you can select
different water pressure levels not only for the
lower basket, but also for the upper basket. So
you can get strong water pressure for the big
pots in the lower basket and soft water
pressure to protect your delicate or valuable
dishes in the upper basket.
4-1-2. Dual Wash
• Newly introduced Slim Direct Inverter motor is
inverter-controlled. Speed is controlled based
on program selection. It also offers high energy
efficiency to minimize energy loss.
4-1-3. Slim Direct Inverter Motor
Moist
Air
Dry
Air
Mixed
Air
• This is one of the best performance solutions
for drying dishes because it minimizes venting
humid air to the outside of the dishwasher. In
addition, this system ensures better drying
results compared to the condensing drying
system.
4-1-4. Hybrid Drying System
- 7 -

4-2 Display Panel
- 8 -
①①Program
①①Program
�MODEL : D1420 / D1423 Series
�MODEL : D1421 / D1422 Series

- 9 -
⑩⑩Spray ⑪⑪Delay Start ⑨⑨Power ⑧⑧Child Lock
②②UV ③③Indicator ④④Time Left ⑥⑥Rinse ⑤⑤Beep On/Off ⑦⑦Half Load
⑩⑩Spray ⑪⑪Delay Start ⑨⑨Power ⑧⑧Child Lock
②②Cool Dry ③③Indicator ④④Time Left ⑥⑥Rinse ⑤⑤Beep On/Off ⑦⑦Half Load

- 10 -
①①Program
• When you want to select program, press this button.
②②UV
• If you want to sterilize the dishes, press UV button.
• After drying cycle, sterilizer will be performed by UV lamp.
• At this time, “St” code is displayed in display window.
Cool Dry
• When you want better drying performance, press this button.
• This process is not part of the program.
• After drying cycle, the fan will operate for a few more minutes to diminish any remaining moisture.
At this time, “Cd” code is displayed in display window.
• If you want, you can open the door and unload the dishes at any time.
③③Indicator
• Child Lock.
• Refill with special salt.
• Refill with rinse aid.
④④Time Left
• Before starting, the display window shows the running time of the selected program.
• After starting, the display window shows the remaining time.
• If the dishwasher has a trouble, the trouble type is displayed.
“OE”, “FE”, “IE”, “EI”, “HE”, “CE”, “LE”, “tE”
• If this error letters are displayed, please refer to the trouble shooting guide page 25 and follow the guide.
⑤⑤Beep On/Off
• The dishwasher must be switched on.
• The beep on/off function can be set by pressing the Half Load and Spray button simultaneously for a
few seconds. Then, a “On” will appear in the display.
• The beep on/off function is automatically canceled when power failure occur.
⑥⑥Rinse
• Repeated pressing of the Rinse button will select Extra Hot, Rinse+, Extra Hot & Rinse+.
• If you select the Extra Hot function, the operating temperature will be up to 80℃. (Dual wash, Auto, Eco)
• When you select Rinse+, an additional rinse cycle is added.
⑦⑦Half Load
• In case of small load, use upper or lower rack only to save energy.
• With each press, can select Upper or Lower rack only.
• In case you don’t select this button, the machine always works vario washing, which operate upper and
lower spray arm alternately.
⑧⑧Child Lock
• Used to lock or unlock the control buttons to prevent all the setting from being changed by a child.
• This function is automatically canceled when power failure occur.
• For locking/ unlocking, press Half Load and Rinse button for a few seconds simultaneously.
⑨⑨Power
• For operating, press this button first for power on.
• After operating, this button automatically switches off for safety and energy saving.
• In case of irregular surge disturbance to the machine, the power may be automatically turned off for safety.
⑩⑩Spray
• With each press, the level of water jet is changed to Strong,Medium and Soft in a sequence.
⑪⑪Delay Start
• If you want to delay the start of selected program, press this button.
• Pressing this button will increase time by 1 hour.
• The delay start time can be adjusted from 1 hour to 19 hours.

- 11 -
4-3 TEST MODE
CHECK PROGRAM(START IN THE STATE OF THE CLOSED DOOR)
※ CHECK MODE
BUTTON
BUTTON OPERATION
Delay Start + Power
Program Button + Half Load
Program Button + Delay Start
Program Button + Spray
①Cool Dry or UV + Power
②Cool Dry or UV
③Spray
＊Select Hardness Level setting mode (Default H4)
＊Change hardness level (H4 H5 H6 H7 H0 H1 H2 H3 H4)
＊Set Hardness Level
Buzz On/Off
Display Inner Temperature
Display Water Supply Frequency
Display Soil Index
The number of
pushing button DISPLAY Load LED
hecking points
Half Load + Rinse
+ POWER Button
Program Button
Cool Dry or UV Button
Delay Start Button
Half Load Button
Rinse Button
Spray Button
1 TIME 1n0H 1U00 All LEDs are lighting
1 TIME
1 TIME
1 TIME
1 TIME
1 TIME
1 TIME
2 TIME
3 TIME
4 TIME
5 TIME
6 TIME
7 TIME
8 TIME
9 TIME
10 TIME
11 TIME
12 TIME
11 11
12 22
13 33
14 44
15 55
Sensing value
n02
n03
Frequency
n05
n06
Temperature
n08
n09
n0A
n 0b
n 0C
Turbidity Sensor
Washing Motor
Drain Pump
Inlet Valve
Dispenser
Heater(for 10 sec.)
Fan Motor
Regeneration Valve
UV Lamp (UV lamp use only)
Vario motor Vario S/W OFF
Vario motor Vario S/W ON
AUTO OFF S/W
Dual Wash
Cool Dry or UV
Delay Start
Half Load
Rinse
Auto, Eco, Gentle, Quick
Pre Wash, Dual Wash
UV
Delay Start
Child Lock, Salf Refill, Rinse Refill
Wash
Rinse
Dry
Upper
Lower
Extra Hot, Rinse+
Strong, Medium, Soft
Operate C1 mode(for 1min.)
Drain(for 42sec.) Supply
water Push Spray Button
(Auto Off)
Micro S/W must be ON to operate HEATER

- 12 -
5. WIRING DIAGRAM

- 13 -
Drain Drain
Drain
Time(Min.)
Wash Wash
Wash
Min.
2 7 12 52 12 8 29 2 30
Dual_wash
Medium Hz & Temp.
560 40 170 40 225 60 500 500 500 70
(default) Sec.
30 10 43 1 1 3 10 5 70 13 30 15 20 10 20 10 20 7 1 10 8 30 20 30 33 5 43 1 10 8 30 20 30 33 5 43 1 10 8 30 20 30 33 5 43 1 1 45 10 20 30
170
Min.
2 7 8 52 40 29 1 30
Auto(Ⅰ)Hz & Temp.
540 75 230 240 55 515 510 70
Sec.
30 10 43 1 1 2 10 5 70 15 30 15 20 10 20 15 20 7 1 10 8 30 20 30 33 5 43 1 10 8 30 20 30 33 5 43 1 1 45 10 20 30
174
Min.
2 7 5 32 12 29 1 30
Hz & Temp.
540 75 230 240 55 515 510 70
Sec.
30 10 43 1 1 2 10 5 70 15 30 15 20 10 20 15 20 7 1 10 8 30 20 30 33 5 43 1 10 8 30 20 30 33 5 43 1 1 45 10 20 30
123
Min.
2 7 8 40 40 29 1 30
Auto(Ⅲ)Hz & Temp.
540 75 165 225 50 495 485 70
Sec.
30 10 43 1 1 2 10 5 70 15 30 15 20 10 20 10 20 7 1 10 8 30 20 30 33 5 43 1 10 8 30 20 30 33 5 43 1 1 45 10 20 30
162
Min.
2 7 5 20 12 29 1 30
Hz & Temp.
540 75 165 225 50 495 485 70
Sec.
30 10 43 1 1 2 10 5 70 15 30 15 20 10 20 10 20 7 1 10 8 30 20 30 33 5 43 1 10 8 30 20 30 33 5 43 1 1 45 10 20 30
111
Min.
2 7 12 66 28 39 2 30
Hz & Temp.
560 40 40 60 39 470 470 59
Sec.
30 10 43 1 1 3 10 5 70 3 30 15 20 5 20 2 20 7 1 10 8 30 20 30 33 5 43 1 10 8 30 20 30 33 5 43 1 1 45 10 20 30
199
Min.
2 7 5 28 7 21 2 30
Hz & Temp.
560 40 40 60 43 490 490 65
Sec.
30 10 43 1 1 3 10 5 70 3 30 15 20 5 20 2 20 7 1 58 10 8 30 20 30 33 5 43 1 10 8 30 20 30 33 5 43 1 1 45 10 20 30
116
Min.
2 7 12 66 28 40 1 30
Hz & Temp.
560 40 40 60 29 470 450 72
Sec.
30 10 43 1 1 3 10 5 70 3 30 15 20 5 20 2 20 7 1 10 8 30 20 30 33 5 43 1 10 8 30 20 30 33 5 43 1 1 45 10 20 30
199
Min.
2 7 5 28 7 21 2 30
Hz & Temp.
560 40 40 60 43 500 500 65
Sec.
30 10 43 1 1 3 10 5 70 3 30 15 20 5 20 2 20 7 1 10 8 30 20 30 33 5 43 1 10 8 30 20 30 33 5 43 1 1 45 10 20 30
115
Min.
2 7 24 12 29 2 30
Hz & Temp.
560 40 150 45 500 500 70
Sec.
30 10 43 1 1 3 10 5 20 6 20 8 5 7 1 10 8 30 20 30 33 5 43 1 10 8 30 20 30 33 5 43 1 1 45 10 20 30
117
Min.
2 7 20 7 29 2 30
Hz & Temp.
560 40 150 45 500 500 70
Sec.
30 10 43 1 1 3 10 5 20 6 20 8 20 7 1 10 8 30 20 30 33 5 43 1 10 8 30 20 30 33 5 43 1 1 45 10 20 30
108
Min.
2 7 20 12 29 2 30
Hz & Temp.
560 40 150 45 500 500 70
Sec.
30 10 43 1 1 3 10 5 20 6 20 8 20 7 1 10 8 30 20 30 33 5 43 1 10 8 30 20 30 33 5 43 1 1 45 10 20 30
113
Min.
2 7 16 7 29 2 30
Hz & Temp.
560 40 150 45 500 500 70
Sec.
30 10 43 1 1 3 10 5 20 6 20 8 20 7 1 10 8 30 20 30 33 5 43 1 10 8 30 20 30 33 5 43 1 1 45 10 20 30
104
Min.
2 7 16 12 29 2 30
Hz & Temp.
560 40 150 45 500 500 70
Sec.
30 10 43 1 1 3 10 5 20 6 20 8 20 7 1 10 8 30 20 30 33 5 43 1 10 8 30 20 30 33 5 43 1 1 45 10 20 30
109
Min.
2 7 12 7 29 2 30
Hz & Temp.
560 40 120 45 500 500 70
Sec.
30 10 43 1 1 3 10 5 20 6 20 8 20 7 1 10 8 30 20 30 33 5 43 1 10 8 30 20 30 33 5 43 1 1 45 10 20 30
100
Min.
15 8 20 1
Hz & Temp.
560 50 500 45 500 65
Sec.
30 10 43 1 10 8 30 20 30 33 5 480 1 10 8 30 20 30 33 5 43 1 1 45 10 20 30
61
Min.
10 4 20 1
Hz & Temp.
560 50 500 45 500 65
Sec.
30 10 43 1 10 8 30 20 30 33 5 43 1 10 8 30 20 30 33 5 43 1 1 45 10 20 30
44
Min.
12 8 16 1
Hz & Temp.
560 50 500 45 500 65
Sec.
30 10 43 1 10 8 30 20 30 33 5 43 1 10 8 30 20 30 33 5 43 1 1 45 10 20 30
46
Min.
10 4 16 1
Hz & Temp.
560 50 500 45 500 65
Sec.
30 10 43 1 10 8 30 20 30 33 5 43 1 10 8 30 20 30 33 5 43 1 1 45 10 20 30
40
Min.
8
8 16 1
Hz & Temp.
560 50 500 45 500 65
Sec.
30 10 43 1 10 8 30 20 30 33 5 43 1 10 8 30 20 30 33 5 43 1 1 45 10 20 30
42
Min.
8 4 16 1
Hz & Temp.
560 50 500 45 500 65
Sec.
30 10 43 1 10 8 30 20 30 33 5 43 1 10 8 30 20 30 33 5 43 1 1 45 10 20 30
38
Min.
12
Hz & Temp.
560
Sec.
30 10 43 1 1 45 10 20 30
15
Min.
8
Hz & Temp.
560
Sec.
30 10 43 1 1 45 10 20 30
11
Working
Time
Soft
(Half Load)
Quick
Medium
(default)
Medium
(Half Load)
Pre-Wash
Strong
(Half Load)
Medium
(default)
Medium
(Half Load)
Soft
(default)
Soft
(default)
Soft
(Half Load)
Gentle
Strong
(default)
Strong
(default)
Strong
(Half Load)
Medium
(default)
Medium
(Half Load)
Strong
(Half Load)
Soft
(default)
Soft
(Half Load)
Economy
Prewash1
Prewash2
Prewash3
Main Wash
Drain A
Drain S
Drain T
DrainP
Wash
Wash
Wash
Drain C
Drain C
Rinse
Heating Rinse
Rinse1
Rinse2
Heating Rinse
Drain C
Wash
Wash
Dry
Dry
Drain
Drain
Drain
Drain
Drain
Drain
Drain
Drain
Drain
Drain
Drain
Stop
Stop
Stop
Drain
Drain
Drain
Stop
Stop
Stop
Stop
Stop
Stop
Stop
Stop
Stop
Stop
Stop
Water supply
Wash
Stop
Stop
Stop
Stop
Water supply
Water supply
Stop
Stop
Stop
Stop
Water supply
Stop
Stop
Stop
Drain
Drain
Water supply
Water supply
Water supply
Heating A
Heating B
Dry
Main Wash
Prewash
DrainB
Program
spray
level
Category
Strong
(default)
Strong
(Half Load)
Soft
(default)
Soft
(Half Load)
Strong
(default)
6. PROGRAM CHART(SCHEMATIC DIAGRAM)

- 14 -- 14 -
BEFORE DISASSEMBLING THE DISHWASHER ;
1) Remove the plug from electric outlet to avoid electric shock.
2) Close the Water Tap(faucet).
3) Remove all dishes and items in the dishwasher.
4) Remove the Lower Rack and the Upper Rack.
5) In case of the water softner assembly model, open the water softner cap to flow out the
water to sump and drain to avoid the floor wet.
6) If necessary, remove the inlet hose and drain hose to avoid the hose damages.
7) Prepare some towels to avoid floor wet by the water left in the dishwasher.
7. HOW TO DISASSEMBLE
7-1. FULL DISASSEMBLE
1. Top Table
1) Remove the rear 2 screws.
2) Pull and lift the top table.
2. Low Cover
3. Side Cabinet-R/L and Tub Felt
1) Cabinet-R
Remove front 4 screws.
Remove rear 3 screws.
2) Cabinet-L
Remove front 4 screws.
Remove rear 3 screws.
2) Tub Felt
Pull the Tub Felt.

- 15 -- 15 -
4. Door Assembly
1) Front Cover
Open the door.
Remove 4 screws(long Type, stainless).
Remove 6 screws(stainless).
Close the door slowly and remove front
cover downwards.
2) Control Panel Assembly
Open the door.
Remove 2 screws(stainless).
Remove wire connection.
Be sure the wiring should not be
changed in reassembling.
Remove 3 screws for Latch assembly
Remove 7 screws for Controller.

- 16 -
3) Fan
Open the door.
Remove the wire connections.
Turn the Inner Cover counterclockwise.
Remove the air duct.
4) Detergent Dispenser
Close the door.
Remove the wire connections.
Remove 6 screws with brackets.
Push the Detergent slowly pulling up the
Flange by Standard Screwdriver.
5) Door Spring (Right & Left)
Push the Spring upwards and take it off
from the Hinge Bracket.
Be careful not to be injured by the sharp
edge of Tub.
Take off the Hinge Link from the Hinge.
6) Door Liner
Open the door.
Remove the wire connections.
Pull the Door liner upwards.

- 17 -
5. Tub assembly
1) Rack
Remove the Upper rack and Lower rack.
2)
Air guide Nut and Water softner Cap&Nut
Turn the Air guide Nut counterclockwise.
(Special tool might be needed.)
Be careful the rubber packing of air guide
assembly should not be lost.
Turn the Water softner Cap
counterclockwise.
4) Filter Assembly
Turn inner filter counterclockwise and lift
inner filter and middle filter.
You can disassemble inner filter and
middle filter by pulling opposite direction.
Lift up main filter.
Lift up micro filter.
3) Nozzle
Pull up the nozzle.

- 18 -- 18 -
5) Nozzle Holder
Disconnect the water guide
Remove 4screws and lift it up
6) Sump Holder
Remove the Sump Holder(5EA).
7) Base spacer
Remove front 2 screws.
Remove side 2 screws.
Lift the front side of dishwasher and pull
the base spacer forward.
8) Lower Frame
Remove 2 screws.
Press the holder hook as shown in
figure.

- 19 -- 19 -
6. Tub sub Assembly
1) Top Frame
Remove front 2 screws.
Remove side 2 screws.
Lift up top frame.
2) Balance Weight
Remove real 4 screws.
Lift up balance weight.
9) Tub sub Assembly
Remove side 4 screws.
Remove 3 Earth screw of right side.
Remove rear 4 screws.
Lift tub assembly upward.
(Be sure water softner is not blocked.)
Be careful not to be injured or scratch
floor by the sharp edge of tub.

- 20 -- 20 -
4) Door Bracket
Remove 4 screws.
Lift up ward.
7. Air Guide Assembly
Lift it upward to disconnect from Water
Softner.
Disconnect the wiring connection.
Remove 3 hoses assembly.
Be careful the o-ring should not be lost.
Be careful not to wet the floor by the
water left in the hose.
3) UV Lamp(Limited on some models.)
Remove the wire connections.
Remove side 4 screws.
Push the UV Lamp slowly.

- 21 -- 21 -
1) Water softner
Remove the hose assembly.
Lift it upward.
Be careful not to wet the floor by the
water left in the water softner.
You can disassemble the solenoid valve
by unscrew the 2 screw.
Be sure not to lost the spring and bobbin.
2) Heater & Drain pump
Remove the wire connections.
Pull the Heater out of the Sump after
releasing the nut.
Remove 3 screw to disassemble the
Drain pump.
8. C-Base Assembly
Remove the wire connections.
Lift them upward.
Be careful not to wet the floor by the
water left in the sump
Pull out the float switch with pressing
downward softly.(not on all models)
Detach the washing motor and heater
assembly by pulling opposite direction
to sump.
Remove the 3 screw for drain motor.