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LG WT4801CW Service Manual

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Read the safety precautions in the manual before servicing the washer.



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  • Page 1: Washing Machine

    WASHING MACHINE SERVICE MANUAL CAUTION Read the safety precautions in the manual before servicing the washer. MODEL WT4801CW...
  • 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 WT4801CW Electrical 120VAC@60Hz Inner Tub Stainless Inlet Water Pressure 14.5 ~ 116 PSI (100 ~ 800 kPa) Rating of Fuse 125V, 12A for 100~127V/60Hz Spin Speed Max. spin speed 1,000 Weight 145.5 lbs (58kg) Cotton/Normal, Heavy Duty, Bulky/Bedding, Tub Clean, Perm Press...
  • Page 4: Installation Instructions

    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 Lift the front of the washer and adjust • level by turnings the adjustable legs Distance between the drain hose and • clockwise or using the adjusting plate. the wall should be more than 4 inches (10 cm), and the distance between any other part and the wall should be more than 1 inch.
  • 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 under. Screw Type Attach the water supply hose to the tap. 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 • Connect the drain hose to the • Attach the clip to the drain hose. • Check that the drain hose is hung outlet of the drain pump located at And then push it toward the body of up over the edge of the laundry tub.
  • Page 8: Operating Instruction

    3. OPERATING INSTRUCTION 3-1. IDENTIFICATION OF PARTS HOT WATER SUPPLY POWDER DETERGENT HOSE Box for delayed washing/softener additves box COLD WATER SUPPLY HOSE Make sure the water does not leak. POWER PLUG If the supply cord is damaged, it must be INLET HOLE FOR replaced by the BLEACH...
  • Page 9: Before Starting To Wash

    Use nylon bag nets for long, DELICATES items. For laundry with long strings or long length, a bag will prevent tangling during washing. Fasten zippers, hooks, and strings to make sure that these items don't snag on other clothes. The nylon washing bag is not supplied by LG.
  • Page 10 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 WASH/RINSE temperature. button. • The temperature of the water impacts the effectiveness of all laundry additives and therefore, the cleaning results. •...
  • Page 11 Loading the dispenser The detergent dispenser drawer of the washing machine has a dispenser compartment for each detergent type. Add the appropriate detergents into its respective compartments. 1 Pull out the detergent dispenser drawer. 2 Add the appropriate detergent to its allocated compartment. - If you use a liquid detergent, check if the liquid detergent cup is in Main Wash place.
  • Page 12: Liquid Bleach Compartment

    Liquid Bleach Compartment This compartment holds liquid chlorine bleach, which will be dispensed automatically at the proper time during the wash cycle. Avoid overfilling or splashing when adding bleach to the dispenser. The maximum capacity of the bleach dispenser is one cup of bleach per wash cycle. Overfilling could result in premature dispensing of bleach, which will result in fabric damage.
  • Page 13: Stain Removal

    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 14: Function Of Each Button

    3-3. FUNCTION OF EACH BUTTON POWER LOAD SENSING It operates in all cycles. Power on. During being detected by the sensor, the LOAD Push again, power goes off SENSING LED flashes. Power goes off automatically after the wash It automatically sensing the size of the load. is finished.
  • Page 15: Soil Level

    FABRIC START/ PAUSE BUTTON SOFTENER Causes the Use to start or pause the wash dispensing of cycle. fabric softener Changes while be made to the in the final wash settings while the machine rinse cycle. is paused. Repeats start and pause by pushing the button.
  • Page 16: Washing Programs

  • Page 17: 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 18: Service Information

  • Page 19: Disassembly Instrucion

    4-2. DISASSEMBLY INSTRUCION CAUTION FOR ELECTROSTATICS 1) Disassembly of Front Panel & PCB (Main+Display) Assembly Rear Panel PCB Display Main PCB PROTECT COVER...
  • Page 20: Power Cord/Pressure Switch

    2) Disassembly of Power Cord, Inlet Valve ASSEMBLY, D.T Housing Inlet Valve ASSEMBLY and Pressure Switch. Disassemble back panel. Disconnect three connectors and disassemble the Pipe power cord. Remove two pipe fixing screws and three inlet valve screws. Disconnect the leads from the inlet valve. Separate the pipe and the connector hose from the inlet valve.
  • Page 21 4) Disassembly of Back Cover, Drain Pump. Remove back cover screws, then disassemble the back cover. Disconnect the leads and the drain hose-p from the drain pump. Remove the pump fixing screws and the connector hose disassemble the drain pump. Pump fixing screw Leads Drain Hose-p...
  • Page 22 6) Replacement of Rotor and Stator Disassemble rotor nut with boxer (M18) or spaner. (Tighten to greater than 200 kgf/cm or xxx foot- pounds.) Disassemble the rotor and pull it out, as shown in the drawing. Fixing Bolt Remove the screws and detach the water guide Water Guide from the tub.
  • Page 23 Loosen but do not remove the 6 screws that secure SNAP RING. the stator. Check the direction of SNAP RING. (The handle of snap ring is toward rotor and stator.) Hold the stator with one hand and remove the screws. Be sure to keep the wiring harness out of the way when reassembling.
  • Page 24: Test Operation 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. Unplug the power when handling the board assembly. (Wear electrostatic discharge gloves when handling the board.
  • Page 25: Troubleshooting Methods For 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. NOTE: NEVER use bar soap in the washing machine. WASHING PROBLEM Problems Possible Causes Solutions and Preventive Measures...
  • Page 26: Troubleshooting Methods According To Error Message

    4-5. TROUBLESHOOTING METHODS ACCORIDNG TO ERROR MESSAGE ERROR DECISION CAUSE FOR ERROR ERROR REMEDY BASIS OCCURRENCE WATER WATER LEVEL Water faucet is closed? Open water faucet. SUPPLY dose not rise to Wait until water supply is Water supply is interrupted. the set level in within resumed.
  • Page 27 ERROR DECISION CAUSE FOR ERROR ERROR REMEDY BASIS OCCURRENCE PRESSURE Pressure switch has a Check the connections at the Reseat the connector. SENSOR bad connection or the pressure switch and at the switch has failed. BLUE 6-pin connector at the main board.
  • Page 28 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 Test thermistor to determine it is not detective AC motor has a bad AC, MOTOR...
  • Page 29: Drain Error

    DRAIN ERROR displayed? Is the connector connected to Replace the Reconnect or Is the coil of the drain pump pump motor assembly DRAIN repair the too high or low? (resistance of disconnected or PUMP connector the coil is 10-20 Ω) disassembled? ASSEMBLY.
  • Page 30: Locked Motor Error

    LOCKED MOTOR ERROR - part of motor displayed? Reconnect Check the connectors below. the connector Motor Is the connector disconnected (connector / or disassembled? wire / motor) (motor hall sensor connector, motor drive connector) Is rotor magnet cracked? - Main PCB Assembly (YL3, BL6) Replace the ROTOR...
  • Page 31: Unbalance Error

    UNBALANCE ERROR OVER FLOW ERROR displayed? displayed? Does the laundry lean toward When you press both SOAK Check the AIR Put laundry evenly one side, not evenly put in the button and Spin Speed button CHAMBER In the DRUM DRUM assembly? simultaneously, is the water and the tube assembly...
  • Page 32: Pressure Sensor Error

    PRESSURE SENSOR ERROR displayed? Is the connector connected to Reconnect or pressure sensor disconnected repair or disassembled? the connector Is the resistance of the Replace the pressure sensor out of range? pressure switch (pin 1~ pin 3) (21~23 Ω ±10%) Yes Fix the air chamber Is the AIR CHAMBER and the and remove...
  • Page 33: Troubleshooting Without Error Codes

    4-6. TROUBLESHOOTING WITHOUT ERROR CODES 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 Replace the Is LED on while the power is...
  • Page 34: Button Doesn't Work

    BUTTON DOESN’T WORK Is the connector connected to Replace the Reconnect or Is the display PCB broken? Main PCB / Display DISPLAY Repair the (check the buzzer sound and PCB disconnected or connector PCB ASSEMBLY LED light disassembled? while push the button ) Connecting connector Main PCB~ Display PCB Is the button of...
  • Page 35: 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 Test points Result Test Points Result...
  • Page 36: 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 38: Stator Assembly

    5-3. STATOR ASSEMBLY Circuit in the MAIN PCB / Wiring Diagram Wiring diagram The direct drive 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 Function are no brushes to wear out.
  • Page 39 The hall sensor determines the speed and direction of the motor. It also can read that the load is off balance when the drum speed fluctuates. - Voltage Testing Hall Sensor at Stator If measuring voltage from the main PCB assembly to the Hall Sensor, use the following steps: 1.
  • Page 40 - Voltage Testing Hall Sensor from the Main PCB Assembly 1. Unplug power cord. 2. Remove rear panel. 3. Remove washer top. 4. Remove main PCB assembly cover as shown in chart below. 5. Locate the blue hall sensor 6 wire connector using wiring diagram wire colors as your guide. 6.
  • Page 41: Pump Motor Assembly

    5-4. PUMP MOTOR ASSEMBLY Circuit in the MAIN PCB/Wiring Diagram Wiring diagram...
  • Page 42: Inlet Valve Assembly

    5-5. INLET VALVE ASSEMBLY Circuit in the MAIN PCB/Wiring Diagram Wiring diagram 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. Disconnect the wiring harness and check the resistance of the valve coil. Test Test points...
  • Page 43: Thermistor Assembly

    5-6. THERMISTOR ASSEMBLY Circuit in the MAIN PCB / Wiring Diagram Wiring diagram The thermistor (temperature sensor) is used to monitor water temperature in the tub, Function Steam Generator, Dry duct and Condensing duct. Test points Wash Thermistor...
  • Page 44 Wash Thermistor Result Test Points Remarks (tolerance ±5%) (1) to (2) 39.5 At 86 (30 ) Result 26.1 At 104 (40 ) (2) to (3) 12.1 At 140 (60 ) At 158 (70 ) At 203 (95 ) At 221 (105 )
  • Page 45: Exploded View

  • Page 46 6-1. EXPLODED VIEW OF TOP COVER ASSEMBLY A011 A016 A063 A061 A062 A202 A050 A201 A200 A153 A151 A180 A184 A160 A154 A390 A152 A020 A150 A182 A186 A161 A110 A241 A410 A230 A100 A191 A240 A090 A380 A157 A140...
  • Page 47 6-2. EXPLODED VIEW OF OUTER CASE ASSEMBLY F032 F004 F005 F070 F002 F003 F000 F100 F090 F080 F020 F082 F027...
  • Page 48 6-3. EXPLODED VIEW OF TUB ASSEMBLY K005 K000 K012 K021 K020 K030 K040 K050 K061 K068 K060 NATURAL K100 K250 K350 K064 K170 K140 K345 K340 K200 K290 K351 K230 K210 K201 K305 K300...
  • Page 49: Replacement Part List

  • Page 50 MAY. 2011 PRINTED IN KOREA P/No. MFL40322141...