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LG WT1201C Series Service Manual

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WASHING MACHINE

SERVICE MANUAL

CAUTION
READ THIS MANUAL CAREFULLY TO DIAGNOSE
PROBLEMS CORRECTLY BEFORE SERVICING THE UNIT.
MODEL : WT1201C*, WT1101C*

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  Summary of Contents for LG WT1201C Series

  • Page 1: Washing Machine

    WASHING MACHINE SERVICE MANUAL CAUTION READ THIS MANUAL CAREFULLY TO DIAGNOSE PROBLEMS CORRECTLY BEFORE SERVICING THE UNIT. MODEL : WT1201C*, WT1101C*...
  • 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 WT1201CW / WT1101CW WT1201CV Electrical 120 VAC@60 Hz. Inner Tub Blue White Stainless Inlet Water Pressure 14.5 ~ 116 PSI (100 ~ 800 kPa) Rating of Fuse 120V/60Hz Spin Speed 1100±50 rpm 134 lbs. (61 kg) [ WT1101C* 132 lbs. (60 kg) ] Weight Cotton/Normal, Heavy Duty, Bright Whites, Cycles...
  • Page 4: Installation Instructions

    2. INSTALLATION INSTRUCTIONS 2-1. HOW TO ADJUST LEVEL Raise Lower 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 • Connect the drain hose to the • And then push it toward the body of • Check that the drain hose is hung outlet of the drain pump located at the washing machine as indicated up over the edge of the laundry tub.
  • 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 BOX for delayed washing/softener additves box INLET HOLE FOR BLEACH POWER PLUG If the supply cord is damaged, it must be replaced by the manufacturer or its service...
  • 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: Water Temperature

    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

    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 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 ·...
  • Page 17 POWER Power on. · Push again, power goes off · Power goes off automatically after the wash · is finished. After turning the power on, the unit will · automatically turn off if nothing is selected. START/ PAUSE BUTTON Use to start or pause the wash ·...
  • Page 18: Washing Programs

    3-4. WASHING PROGRAMS. Cycle guide The cycle guide below shows the options and recommended fabric types for each cycle. =Default setting Fabric Cycle Fabric Type Wash Temp. Spin Speed Soil Level Soak COLDWASH Extra Rinse Softener Cotton/Normal Cotton, shirts, jeans High Heavy Warm...
  • Page 19: 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 20: 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 21 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 22 3) Disassembly of Top Cover and Lid ① Remove the hinge cover. ② Remove 3 hinge screw ③ Pull the hinge to the left and right. ④ Remove the hinge.
  • Page 23 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 24: Drain Pump

    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 25 ③ Remove the screws that secure the water guide. ④ Disconnect the hall sensor and 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 26 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 27: Wiring Diagram

    4-2. WIRING DIAGRAM...
  • Page 28: 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 29: 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 30: Troubleshooting Summary

    4-5. TROUBLESHOOTING SUMMARY...
  • Page 31: Troubleshooting With Error Code

    4-6. 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 32 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 33 ERROR DECISION CAUSE FOR ERROR ERROR REMEDY BASIS OCCURRENCE · Thermistor has a bad · Check the connections at the · Reseat the connector. THERMISTOR connection or failed Thermistor and at the WHITE 3-pin connector at the main board · Replace the thermistor if necessary.
  • Page 34 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 35 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 hall sensor connector, motor drive connector) Is rotor magnet cracked? - Part of main PCB assembly (YL3, BL4) Replace the...
  • Page 36: Unbalance Error

    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 37 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 38: Other Troubleshooting

    4-7. 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 39 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 40: 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 Test points...
  • Page 41: 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 42 (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 43: 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 44 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 45 - 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 Figure below. 5. Locate the Blue Hall Sensor 6 wire connector using wiring diagram wire colors as your guide. 6.
  • 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 A020 A010 A030 A040 A240 A050 A202 A201 A200 A152 A061 A154 A062 A190 A153 A151 A101 A163 A150 A165 A230 A410 A100 A101 A241 A165 A163 A184 A180 A380 A183 A186 A140 A390 A157 A102 (A102)this is old type of Top Cover...
  • Page 52 6-2. EXPLODED VIEW OF OUTER CASE ASSEMBLY F102 F103 F104 F105 F032 (F102~5)This is old type of Hanger Pivot F016 F070 F000 F001 (F090) &(F100) The replacement parts in this kit may be different than the original. Replace all the original drain (F001)This is old type hose parts with these new parts.
  • Page 53 6-3. EXPLODED VIEW OF TUB ASSEMBLY K005 K000 K012 K021 K020 K030 K040 K050 K061 K060 NATURAL K100 K250 K350 K064 K430 K170 K140 K345 K340 K200 K290 K230 K210 K201 K305 K300...
  • Page 54: Replacement Part List

    7. REPLACEMENT PART LIST...
  • Page 55 Mar. 2012 PRINTED IN KOREA P/No.: MFL 40322158...

This manual is also suitable for:

Wt1101c series