LG WT1901CK Service Manual
  1. Manuals
  2. Brands
  3. LG Manuals
  4. Washer
  5. WT1901CK
  6. Service manual

LG WT1901CK Service Manual

Hide thumbs Also See for WT1901CK:
Table of Contents

Advertisement

Quick Links

WASHING MACHINE
SERVICE MANUAL
CAUTION
READ THIS MANUAL CAREFULLY TO DIAGNOSE
PROBLEMS CORRECTLY BEFORE SERVICING THE UNIT.
MODEL : WT1901C*

Advertisement

Table of Contents
loading

Related Manuals for LG WT1901CK

Summary of Contents for LG WT1901CK

  • Page 1 WASHING MACHINE SERVICE MANUAL CAUTION READ THIS MANUAL CAREFULLY TO DIAGNOSE PROBLEMS CORRECTLY BEFORE SERVICING THE UNIT. MODEL : WT1901C*...

  • Page 2: Table Of Contents

    SAFETY PRECAUTION! 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 or 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.

  • Page 3: Specifications

    1. SPECIFICATIONS Model WT1901C* Electrical 120 VAC@60 Hz. Inner Tub Stainless Inlet Water Pressure 20 ~ 120 psi(138 ~ 827 kPa) Rating of Fuse 120V/60Hz Spin Speed 1100±50 rpm Weight 137.3 lbs. (62.3 kg) Normal, Heavy Duty, Bulky, Bright Whites, Oxi Sanitize, Cycles Tub Clean, Pre Wash+ Normal, Towels, Waterproof, Speed Wash, Delicates, Downloaded...

  • Page 4: Installation Instructions

    Raise Lower 2. INSTALLATION INSTRUCTIONS 2-1. HOW TO ADJUST LEVEL Installation area Checking level Install the washer on a firm, flat • Open the lid, check if the washer is • surface. correctly leveled by looking down If the washer is installed on an •...
  • Page 5 Horizontal setting Distance between the drain hose and the wall • If the washer is not level, adjust the leveling feet. Turn clockwise to raise, Distance between the drain hose and • counterclockwise to lower. the wall should be more than 4 inches (10 cm,) and the distance between any side to side other part and the wall should be more...

  • Page 6: Connecting Water Supply Hose

    2-2. CONNECTING WATER SUPPLY HOSE Before connecting the water supply hose to the water tap, check the hose type and then choose the correct instruction here below. Screw Type Be sure there is a gasket in both ends of the hose. Push the water supply hose up so that the rubber packing Water tap within the hose can adhere completely to the tap.

  • Page 7: Connect The Drain Hose

    2-3. CONNECT THE DRAIN HOSE • Insert the end of the drain hose into the drain. • If the drain is large enough for the flange on the hose to fit inside, then do not insert the flange more than 1-2 inches into the drain.

  • Page 8: Operating Instructions

    3. OPERATING INSTRUCTION 3-1. IDENTIFICATION OF PARTS COLD WATER SUPPLY HOSE HOT WATER SUPPLY HOSE DOOR Make sure the water does not leak. HARDENED GLASS POWDER DETERGENT SMART RINSE WITH BOX for delayed JET SPRAY washing/softener additves box This washer is designed to save rinse water by using a jet spray rinse system in the INLET HOLE FOR...

  • Page 9: Before Starting To Wash

    3-2. BEFORE STARTING TO WASH Care Labels • Look for a care label on your clothes. This will tell you about the fabric content of your garment and how it should be washed. Sort clothes into loads that can be washed with the same wash cycle, water temperature, and spin speed.
  • Page 10 1) Using Water Water Temperature • The machine sets the appropriate temperature automatically according to the wash program . You can override the preset selection by pressing the water temperature icon. Touch the arrow buttons up or down until your desired temperature setting is displayed. •...
  • Page 11 2) Using Detergent Detergent Follow the detergent package directions. Using too little detergent is a common cause of laundry problems. Use more detergent if you have hard water, large loads, greasy or oily soils or lower water temperature. Choosing the Right Detergent Your washing machine is designed for use with only High-Efficiency (HE) detergents.
  • Page 12 Using the Dispenser Drawer ABOUT THE DISPENSER Main Wash Main Wash Powder Detergent Liquid Detergent The automatic dispenser consists of two Compartment Compartment compartments which hold: • Liquid fabric softener. Liquid Fabric • Liquid or powdered detergent. Softener All laundry products can be added at once in their respective Compartment dispenser compartments.
  • Page 13 Adding Detergent Add measured detergent to the detergent compartment of the dispenser drawer. • Do not exceed the maximum fill line. Detergent is flushed through the dispenser at the beginning of the wash cycle. Either powdered or liquid detergent can be used, but the drawer insert must be removed to use powder.
  • Page 14 3) Special Guide for Stain Removal WARNING Do not use or mix liquid chlorine bleach with other household chemicals such as toilet cleaners, rust removers, acid, or products containing ammonia. These mixtures can produce dangerous fumes which can cause serious injury or death. To reduce the risk of fire or serious injury to persons or property, comply with the basic warnings listed below: •...
  • Page 15 Stain Removal STAIN TREATMENT Adhesive tape, chewing Apply ice. Scrape off excess. Place stain face down on paper towels. Saturate with gum, rubber cement prewash stain remover or nonflammable dry cleaning fluid. Baby formula, dairy Use product containing enzymes to pretreat or soak stains. products, egg Beverages (coffee, tea, soda, Pretreat stain.

  • Page 16: Function Of Each Button

    3-3. FUNCTION OF EACH BUTTON Load Sensing · It operates in all cycles. · During being detected by the sensor, the LOADSENSING LED flashes. · It automatically sensing the size of the load. · During this step, the washing machine selects optimized washing algorithm.
  • Page 17 POWER · Power on. · Push again, power goes off · Power goes off automatically after the wash is finished. s an · After turning the power on, the unit will automatically turn off if nothing is selected. START/ PAUSE BUTTON ·...

  • Page 18: Washing Programs

    3-4. WASHING PROGRAMS. CYCLE GUIDE The cycle guide below shows the default settings, available options and = Default Setting recommended fabric types for each cycle. Allowable modifier adjust- ments are shown below the default setting for each cycle. Fabric or Load Stain Cold Extra...
  • Page 19 CYCLE GUIDE The cycle guide below shows the default settings, available options and = Default Setting recommended fabric types for each cycle. Allowable modifier adjust- ments are shown below the default setting for each cycle. Fabric or Load Stain Cold Extra Water Turbo...

  • Page 20: Care And Maintenance

    3-5. CARE AND MAINTENANCE When There Is The Possibility Of Freezing Temperatures • Close the water taps and remove the water supply hoses. • Remove the water which remains in the water supply. • Lower the drain hose and drain the water in the sump and the drain hose by running a spin cycle. If Frozen •...

  • Page 21: Service Information

    4. SERVICE INFORMATION 4-1. DISASSEMBLY INSTRUCTION ▶ Be sure to unplug the power to repair and replace electric parts. ESD (ElectroStatic DIscharge) WARNING Be sure to follow proper ESD and grounding precautions for diagnosis and repair. If this is not possible, touch the ground wire on a regular basis to remove any static charge built up on your person.
  • Page 22 2) Disassembly of the Noise Filter, Power Cord, Inlet Valve, Pressure Switch, and Dispenser Housing. ① Remove 2 screw attaching the panel on the back. ② Disassemble the rear panel. Noise Filter and Inlet Valve Power Cord ① Disconnect the ①...
  • Page 23 3) Disassembly of Top Cover and Lid ① Remove 2screws attaching the back side of top cover. ② Remove 2screws that assembly the top cover with the front panel. ③ Lift the top cover at the front of the washer. ④...
  • Page 24 Inner Tub Cap Hub Fixing Nut Tub Cover Outer Tub Inner Tub Pulsator Cap Pulsator Shaft Bearing Housing ASM Screw Rotor Rotor Nut Stator Pulsator Inner Hub Attachment Nut Tub Cap 4) Disassembly of Tub Cover and Pulsator ① Remove 8 screws and take off the tub cover. ②...
  • Page 25 7) Disassembly of the Back Cover and Drain Pump ① Remove the screws that attach the back cover and take it off. ② Disconnect the leads and the drain hose from the drain pump. ③ Remove the pump attachment screws and the lead connector.
  • Page 26 ③ Remove the screws that secure the water guide. ④ Disconnect the stator connection before removing the stator in the subsequent step. ⑤ Remove the six screws securing the rotor. ⑥ Check the position of the snap ring, being sure it faces the rotor and stator.
  • Page 27 ⑨ Remove four screws to release the tub bracket. ⑩ Remove 17 screws to release the bearing housing. Pull the housing away from the tub, but do not pry it with a screwdriver to avoid damage. Bearing Housing 10) Disassembly of Door Lock Switch Remove the two door lock attachment screws.

  • Page 28: Wiring Diagram

    4-2. WIRING DIAGRAM...

  • Page 29: Test Running Without Water

    4-3. TEST RUNNING WITHOUT WATER 1) SAFETY CAUTION • The main power board assembly has exposed live 120 VAC and live DC voltages. Use care when disconnecting connectors during troubleshooting and testing. (Wear electrostatic discharge gloves when handling the board. •...

  • Page 30: Troubleshooting By Common Washing Problems

    4-4. TROUBLESHOOTING BY COMMON WASHING PROBLEMS Many washing problems involve poor soil and stain removal, residues of lint and scum, and fabric damage. For satisfactory washing results, follow these instructions. Use ONLY powdered or liquid HE (High Effificiency) detergents. Do NOT use flakes scraped from a soap cake or bar, flakes, soap ribbons (available in some markets,) detergent tablets, plastic pouches, magic laundry balls, or anything other than powdered or liquid HE detergent products.

  • Page 31: Troubleshooting Summary

    4-5. TROUBLESHOOTING SUMMARY...

  • Page 32: Pcb Picture

    4-6. PCB Picture...

  • Page 33: Troubleshooting With Error Code

    4-7. TROUBLESHOOTING WITH ERROR CODE ERROR DECISION CAUSE FOR ERROR ERROR REMEDY BASIS OCCURRENCE · WATER LEVEL · Water faucet is closed? · Open water faucet. WATER · Water supply is interrupted. SUPPLY dose not rise to Wait until water supply is the set level in within resumed.
  • Page 34 ERROR DECISION CAUSE FOR ERROR ERROR REMEDY BASIS OCCURRENCE · Pressure switch has a · Check the connections at the · Reseat the connector. PRESSURE SENSOR bad connection or the pressure switch and at the switch has failed. BLUE 6-pin connector at the ·...
  • Page 35 ERROR DECISION CAUSE FOR ERROR ERROR REMEDY BASIS OCCURRENCE THERMISTOR · Thermistor has a bad · Check the connections at the · Reseat the connector. connection or failed Thermistor and at the WHITE 3-pin connector at the main board · Replace the thermistor if necessary.
  • Page 36 DRAIN ERROR Is OE displayed? Is the connector connected to Replace the Reconnect or Is the coil of the drain pump pump motor assembly DRAIN PUMP repair the too high or low? (resistance of disconnected or ASSEMBLY. connector the coil is 10-20 Ω) disassembled? Is the voltage between Replace the...
  • Page 37 LOCKED MOTOR ERROR - Part of motor Is LE displayed? Reconnect Check the connectors below. the connector Is the connector disconnected Motor (connector / or disassembled? wire / motor ) (motor drive connector) - Part of main PCB Is rotor magnet cracked? assembly (YL3) Replace the ROTOR...
  • Page 38 UNBALANCE ERROR OVER FLOW ERROR Is UE displayed? Is FE displayed? Does the laundry lean toward When you enter the service Put laundry evenly Check the AIR one side, not evenly put in the mode, is the water level In the DRUM CHAMBER and the DRUM assembly? frequency over 21.0 kHz?
  • Page 39 PRESSURE SENSOR ERROR Is PE displayed? Is the connector connected to Reconnect or pressure sensor disconnected repair the or disassembled? connector Is the resistance of the Replace the pressure sensor out of range? pressure switch (pin 1~ pin 3) (21~23 Ω±10%) Fix the air Is the AIR CHAMBER and the chamber and...

  • Page 40: Other Troubleshooting

    4-8. OTHER TROUBLESHOOTING CAUTION 1. Be careful of electric shock if disconnecting parts while troubleshooting. 2. First of all, check the connection of each electrical terminal with the wiring diagram. 3. If you replace the main PCB assembly, reinsert the connectors correctly. NO POWER Is LED on while the power is Replace the MAIN...
  • Page 41 POWER BUTTON DOESN’T WORK Replace the Is the connector connected to Reconnect or Is the display PCB broken? DISPLAY PCB Main PCB / Display PCB repair the (check the buzzer sound and disconnected or connector ASSEMBLY LED light while touch the disassembled? LCD) Connecting connector...

  • Page 42: Component Testing Information

    5. COMPONENT TESTING INFORMATION WARNING When resistance (Ohm) checking the component, be sure to turn the power off, and do voltage discharge sufficiently. 5-1. Filter Assembly (Line Filter) Circuit in the MAIN PCB / Wiring Diagram Wiring diagram MAIN PCB ASSEMBLY (1) (3) Test...

  • Page 43: Door Lock Switch Assembly

    5-2. Door Lock Switch Assembly. Circuit in the MAIN PCB / Wiring Diagram Wiring diagram The Door Lock Switch Assembly consists of a Solenoid, Plunger, Level, Key, Sol-spring and Micro Switch. It locks the door during a wash cycle. 1. Door lock operation - When a cycle is started, the PCB sends the door lock signal if Reed switch detects that the door is closed.
  • Page 44 (10) (13) (12) (11) Parts Test points COVER SCREW LEAD WIRE PACKING SOLENOID CASE HAND WIRE MICRO SW SOL-SPRING PLUNGER LEVER RUBBER CASE...

  • Page 45: Stator Assembly

    5-3. STATOR ASSEMBLY Circuit in the MAIN PCB / Wiring Diagram Wiring diagram The DD motor can be driven from stopped to maximum speed in infinite steps in either direction. There are 36 poles on the stator; 12 permanent magnets spaced around the rotor. There are no Function brushes to wear out.

  • Page 46: Pump Motor Assembly

    5-4. PUMP MOTOR ASSEMBLY Circuit in the MAIN PCB Wiring Diagram Wiring diagram Test Points Result Remarks (1) to (2) 10.9 Ω±5% Resistance Test points Result...

  • Page 47: Inlet Valve Assembly

    5-5. INLET VALVE ASSEMBLY Circuit in the MAIN PCB Inlet valve driving circuit Wiring diagram Wiring diagram INLET VALVE * All valves operate at 13.5 VDC. Depending on the cycle and water temperature, the controller will energize the hot or cold water Function valve solenoids to meet the selected water temperature.

  • Page 48: Thermistor Assembly

    5-6. THERMISTOR ASSEMBLY Circuit in the MAIN PCB / Wiring Diagram Wiring diagram MAIN PCB The thermistor (temperature sensor) is used to monitor water temperature in the tub. Function Test points Wash Thermistor...
  • Page 49 Wash Thermistor Result [㏀] Test Points Remarks The lowest standard The upper limit limit (1) to (2) 70.519 76.531 82.848 At 86℉ (30℃) Result 46.997 50.584 54.307 At 104℉ (40℃) 22.285 23.623 24.978 At 140℉ (60℃) 15.803 16.635 17.467 At 158℉ (70℃) 6.984 7.471 7.971...

  • Page 50: Exploded View

    6. EXPLODED VIEW BODY-A BODY-B...
  • Page 51 6-1. EXPLODED VIEW OF TOP COVER ASSEMBLY A020 A010 A030 A040 A240 A050 A202 A201 A200 A061 A152 A062 A190 A154 A153 A101 A151 A163 A150 A165 A230 A410 A100 A101 A241 A165 A163 A184 A180 A380 A183 A186 A140 A390 A157...
  • Page 52 6-2. EXPLODED VIEW OF OUTER CASE ASSEMBLY F032 F005 F016 F070 F006 F000 F100 F090 F020 F086 F080 F027 F023 F082...
  • Page 53 6-3. EXPLODED VIEW OF TUB ASSEMBLY K005 K000 K012 K021 K020 K030 K040 K050 K061 NATURAL K100 K060 K104 K250 K350 K064 K170 K140 K345 K340 K200 K290 K230 K210 K201 K305 K300...

  • Page 54: Replacement Part List

    7. REPLACEMENT PART LIST...

  • Page 55: Wiring Diagram

    8. Wiring Diagram...
  • Page 56 DEC 2016 PRINTED IN VIETNAM P/No.MFL69647003...

This manual is also suitable for:

Wt1901c series

Table of Contents