LG WF-HD120S Service Manual
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LG WF-HD120S Service Manual

LG WF-HD120S Service Manual

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WASHING MACHINE
SERVICE MANUAL
CAUTION
Before servicing the washer, Read the safety precautions in the manual.
MODELS : WF-HD120S

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Summary of Contents for LG WF-HD120S

  • Page 1 WASHING MACHINE SERVICE MANUAL CAUTION Before servicing the washer, Read the safety precautions in the manual. MODELS : WF-HD120S...
  • Page 2 AUGUST,2015 PRINTED IN THAILAND P/No.: MFL69275701...

  • Page 3: Table Of Contents

    SAFETY PRECAUTION! DISASSEMBLE POWER CORD BEFORE SERVING 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 or property damage.
  • Page 4 1. SPECIFICATIONS Refer to rating label on the back of Washer POWER SOURSE Refer to rating label on the back of Washer INPUT Refer to rating label on the back of Washer CAPACITY Plastic / Stainless INNER TUB 0.3kgf/cm ~ 8kgf/cm PRESSURE 50/60 Hz : 800 50 rpm...

  • Page 5: Installation Instructions

    2. INSTALLATION INSTRUCTIONS 2-1. HOW TO ADJUST LEVEL Installation area Checking level How to use the adjusting plates Improper installation of the washer may cause noise and malfunctioning. 1. The ventilating openings in the base area must not be obstructed be carpeting when the washing machine is installed on a carpeted floor.
  • Page 6 Checking slope Confirming level Horizontal setting Distance between drain hose and the wall...
  • Page 7 2-2. CONNECTING WATER SUPPLY HOSE Before connecting Water Supply Hose to water tap, check your hose type and choose correct instruction. Water Supply Hose may vary according to the country. Make sure connect blue inlet hose to COLD water tab, and orange inlet hose to HOT water tab. Connecting Water Supply Hose to water tap Normal Type {Normal tab without thread &...
  • Page 8 One Touch Type (NORMAL TAB WITHOUY THREAD & ONE TOUCH TYPE INLET HOSE.) Separate Middle connector from Water Supply Hose Separate Middle connector from the Water Conector Middle connector Etiqueta Fija Fixed Stiicker Supply Hose by pulling the Pressing Rod and Medio Manija de Presión Pressing Handle...
  • Page 9 Screw Type Attach the water supply hose to the tap. Push the water supply hose up so that the rubber packing within the hose can adhere completely Water to the tap. Water Supply Hose Rubber Packing Connect the water supply hose to the tap. Connect the water supply hose to the tap and then tighten it by screwing it to the right.
  • Page 10 2-3. CONNECT THE DRAIN HOSE For pump model Connect the drain hose to the Attach the clip to the drain hose. Check that the drain hose is outlet of the drain pump located And then push it toward the body hung up over the edge of the at the rear of the washing of the washing machine as...

  • Page 11: Operating Instructions

    3. OPERATING INSTRUCTION 3-1. IDENTIFICATION OF PARTS POWDER AND LIQUID WATER SUPPLY DETERGENT BOX HOSE Make sure the water does not leak. LIQUID SOFTENER POWER PLUG If the supply cord is BLEACH damaged, it must be DISPENSER replaced by the manufacturer or its service agents or FUNCTION...

  • Page 12: Before Starting To Wash

    Use nylon nets for long, DELICATE items. For laundry with long strings or long length , a net will prevent tangling during washing. Fasten zippers, hook, and strings to make sure that these items don't snag on other clothes. Nylon net is not supplied by LG.
  • Page 13 Using Water Amount of WATER LEVEL • This machine detects the quantity of laundry automatically, then sets the WATER LEVEL and displays the amount of detergent to be used. • When you select a wash program, the WATER LEVEL and amount of Detergent (to be used) will be shown on the control panel.
  • Page 14 Using Detergent Detergent Follow the Detergent package directions. Using too little Detergent is a common cause of laundry problems as is if too much detergent is used. Only more Detergent if you have hard water, large loads, greasy or oily soils or lower Water Temperature. Choosing the right Detergent We recommend the use of drum type, low sudsing high efficiency Detergent(powder,liquid or concentrated).
  • Page 15 Using Liquid Bleach (Have Only Model) • Check clothing care label for special instructions and separate the laundry to be bleached • Dilute liquid chlorine bleach. • Measure the recommended amount of liquid bleach carefully following instructions on the bottle. •...
  • Page 16 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 17: Function Of Each Button

    3-3. FUNCTION OF EACH BUTTON TIME LEFT, DELAY STAR T WATER B UT TON (RESERVATION), ALARM INDICATION • Use to select the proper amount of water in relation • Time left - During operation, the remaining time to the weight and type of laundry. is indicated.

  • Page 19: Washing Programs

    3-4. WASHING PROGRAMS Washing Programs the Detergent laundry • Add the appropriate This program is for mixed fabrics quantity of Detergent as as normal operation. It is indicated by the automatically selects the most WATER LEVEL next to appropriate wash conditions such WATER DETERGENT.
  • Page 20 Close the lid Finish Caution & Note • If water is already in the tub, or putting wet laundry into the tub before starting will increase the WATER LEVEL. • The pulsator rotates for • Water will be let in •...

  • Page 21: Other Functions

    3-5. OTHER FUNCTIONS 1) SOAK Wash Use this mode to wash normal clothes or thick and heavy clothes which are excessively dirty. SOAK mode can be used with FUZZY or JEAN or EXTRA CLEANING or FAVORITE program. Press the POWER (AUTO OFF) button to turn power on. Press the PROGRAM button to select the washing program.
  • Page 22 2) FAVORITE Wash Pressing the FAVORITE button allows you to store your FAVORITE wash conditions in the normal cycle memory and then recall it for use at a later time. Press the POWER (AUTO OFF ) button to turn power on. Select the FAVORITE program.
  • Page 23 PREWASH+NORMAL Press the POWER (AUTO OFF) button to turn power on. Press the PROGRAM button to select PREWASH+NORMAL program. Add the laundry into the washing tub. Press the S TART/ PAUSE button. Add the Detergent and close the lid.
  • Page 24 3-5. OTRAS FUNCIONES Normal is the economical program to minimize water consumption. Press the AUTO OFF (POWER ) button to turn power on . Press the PROGRAM button to select the NORMAL program. • Ex-Large WATER LEVEL is set automatically. Add the laundry into the washing tub.
  • Page 25 5) DELAY START (RESERVATION) Wash DELAY START (RESERVATION) Wash is used to delay the finishing time of the operation. The hours to be delayed can be set by the user accordingly. The time on the display is the finishing time, not the start time. Press the POWER (AUTO OFF) button to turn power on.
  • Page 26 6) AIR DRY AIR DRY can be used to further remove moisture after the wash cycle by subjecting the load to air currents within the machine. This function will not dry clothes completely and should only be used for loads under 2 kg. Press the POWER (AUTO OFF) button to turn power on.
  • Page 27 7) Option Washing When you only need the Wash, Wash/Rinse or Rinse cycles, these can be set manually. Press the POWER (AUTO OFF) button to turn power on. Only Spin Only Wash Only Rinse Press the WASH button to Press the RINSE button to Press the SPIN button to select the desired timing.
  • Page 28 8) Other Useful Functions Child Lock Function If you want to lock all the keys to prevent settings from being changed by a child, you can use the child lock option. How to Lock Press the POWER (AUTO OFF) button. •...

  • Page 29: Cleaning And Maintenance

    3-6. CLEANING AND MAINTENANCE When there is a possibility of freezing ambient temperatures. • Close the water taps and remove the Water Supply Hose. • Remove the water which remains in the water supply. • Lower the drain hose and drain the water in the bowl and the drain hose by spinning. If frozen •...

  • Page 30: Service Information

    4. SERVICE INFORMATION 4.1 USING SMART DIANOSIS BEEPER...

  • Page 31: Test Running Without Water

    4-2. TEST RUNNING WITHOUT WATER Number of times the START/PAUSE Check Point Disp lay Status button is pressed None Main program version T1 and main program version 1 time Display program version T2 and display program version 2 time None 3 time Inlet valve for bleach detergent turns A and water level frequency (1~10 Level)

  • Page 32: Wiring Giagram

    WIRING DIAGRAM MAIN CONTROLLER CN10 BK BN RD OR YL GN BL VL GY WH BK RD YL 1 2 3 1 2 3 1 2 3 4 1 2 3 1 2 3 4 5 6 7 8 9 1 2 4 1 2 3 BL GY...

  • Page 33: Program Time Chart

    4-4. PROGRAM TIME CHART...

  • Page 34: Disassembly Instruction

    4-5. DISASSEMBLY INSTRUCTION Be sure to unplug the power to repair and replace electric parts. CAUTION FOR ELECTROSTA TICS Be sure to make earth connection for trouble diagnosis and parts replacement. If impossible, touch earth wire on the body to remove electric deviation between the body and product before work.
  • Page 35 2) Disassembly of Back Panel, Power Cord, Inlet Valve & BP Sensor Remove two back panel fixing screws in the back side. Disassemble the back panel. Disconnect two connectors and disassemble the power cord. Remove a valve fixing screw & disconnect the leads form the inlet valve.
  • Page 36 3) Disassembly of Back cover, Drain Pump. Remove back cover fixing 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. 4) Replacement of Damper asm Separate top cover from washing machine.
  • Page 37 6) Replacement of Rotor & Stator Disassemble rotor nut with boxer(M18) or spaner. ( In assembled, the force is over than 200kgf.cm) Disassemble rotor, pull out the rotor as shown the figure. Fixing Bolt Disconnect fixing screw and disassemble the water guide.
  • Page 38 SNAP RING. Loosen the 6 fixing screws on the stator. (Lower upper position screws) Check the direction of SNAP RING. (The handle of snap ring is toward to rotor and stator.) Preventing fallen the stator, tighten with one hand and then loosen the last screw.

  • Page 39: Trouble Shooting Against Common Washing Problems

    4-6. TROUBLE SHOOTING AGAINST COMMON WASHING PROBLEMS Many washing problems involve poor soil & stain removal, residues of lint and scum, and fabric damage. For satisfactory washing results, follow these instructions. WASH PROBLEM Problems Possible Causes Solutions & Preventive Measures Poor soil •...

  • Page 40: Trouble Shooting Methods According To Error Message

    4-7. TROUBLE SHOOTING METHODS ACCORIDNG TO ERROR MESSAGE Problem Diagnosis Estimated Cause of Display Action Standard Abnormal Condition Water supply problem • When it did not reach the 1. When the faucet is locked or • Open the faucet for water RESET level frequency frozen supply...
  • Page 41 4-7. TROUBLE SHOOTING METHODS ACCORIDNG TO ERROR MESSAGE Problem Diagnosis Estimated Cause of Display Action Standard Abnormal Condition Level sensor problem • When the frequency 1. When the connector connected • Reconnect the connector generated by recognizing to the pressure switch or the or correct the contact level height in the pressure blue 6 pin connector is fallen o...

  • Page 42: Troubleshooting Summary

    4-8 TROUBLESHOOTING SUMMARY Inlet Valve RD6 Pin1 : Rinse valve Pin3 : Cold valve BK to BL Pin4 : Jet valve Pin5 : Hot valve WH to BN MAIN CONTROLLER CN10 BK BN RD OR YL GN BL VL GY WH BK RD YL 1 2 3 4 5 6 7 8 9 1 2 4 1 2 3...
  • Page 43 4-8-1. TROUBLESHOOTING WITH ERROR Replace the Is the voltage of the inlet INLET VALVE ERROR INLET VALVE valve connector 12V DC ? ( Check the all terminal of ASSEMBLY INLET VALVE ASSEMBLY displayed? while the power is on.) Check the AIR When you press both Water CHAMBER level button and Spin button...
  • Page 44 DRAIN ERROR displayed? Reconnect or Is the connector connected Is the coil of the drain Replace the repair to pump motor assembly pump too high or low? DRAIN disconnected or the connector (resistance of the coil PU MP disassembled? is 10-20 ) ASS E MBLY .
  • Page 45 4-8-1 TROUBLESHOOTING WITH ERROR LOCKED MOTOR ERROR displayed? Reconnect Check the connectors below. the connector Motor Is the connector disconnected (connector / or disassembled? wire / motor ) - part of main PWB assembly (YL3) Motor Drive Motor Drive...
  • Page 46 4-8-1 TROUBLESHOOTING WITH ERROR UNBALANCE ERROR OVER FLOW ERROR displayed? displayed? Put laundry When you press both Water Check the AIR Does the laundry lean evenly level button and Spin button CHAMBER toward one side, not evenly In the DRUM simultaneously, is the water and the tube put in the DRUM assembly?
  • Page 47 4-8-1 TROUBLESHOOTING WITH ERROR PRESSURE SENSOR ERROR displayed? Is the connector connected Reconnect or to pressure sensor repair disconnected or the connector disassembled? Is the resistance of the Replace the pressure sensor out of pressure range? switch (pin 1~ pin 3) (21~23 10%) Fix the air...
  • Page 48 4-8-1 TROUBLESHOOTING WITH ERROR CLUTCH MOTOR ERROR Turn on WM and operate displayed? check clutch motor Is it spin Replace or not? Clutch motor or sub PCB or PCB Is the connector connected to harness Sub PWB assembly disconnected or Reconnect or disassembled? (NA5) repair...
  • Page 49 4-8-1 TROUBLESHOOTING ELSE 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 PWB ASSEMBLY, reinsert the connectors correctly. NO POWER Replace the Is LED on while the power...
  • Page 50 4-8-1. TROUBLESHOOTING ELSE BUTTON DOESN’T WORK Is the display PCB broken? Replace the Is the connector connected Reconnect or (check the buzzer sound DISPLAY to Main PWB / Display Repair and LED light PWB disconnected or the connector while push the button ) ASSEMBLY disassembled? Connecting connector...

  • Page 51: Component Testing Information

    4-9. COMPONENT TESTING INFORMATION When Resistance (Ohm) checking the Component, be sure to turn the power off, WARNING and do voltage discharge sufficiently. 4-9-1. FILTER ASSEMBLY (LINE FILTER) Circuit in the MAIN PWB / Wiring Diagram Wiring diagram Test INPUT points OUTPUT Result...
  • Page 52 4-9-2. STATOR ASSEMBLY Circuit in the MAIN PWB / Wiring Diagram MAIN CONTROLLER Wiring CN10 diagram 1 2 3 4 1 2 3 YL RD 1 2 3 4 5 3 4 2 6 4 5 1 2 3 BN BL MOTOR CLUTCH MOTOR...
  • Page 53 4-9-3. PUMP MOTOR ASSEMBLY Circuit in the MAIN PWB Wiring Diagram MAIN CONTROLLER CN10 1 2 3 4 1 2 3 4 5 MICOM Wiring diagram 3 4 2 CONNECTOR Pump Driving circuit / WH PUMP PUMP * Each circuits of loads in wiring diagram are all same. Used to drain the tub Function Drain Pump...
  • Page 54 4-9-4. INLET VALVE ASSEMBLY Circuit in the MAIN PWB MICOM Wiring diagram CONNECTOR Inlet valve driving circuit INLET Wiring diagram VALVE MAIN CONTROLLER 1 2 3 4 5 BL GY RINSE COLD VALVE VALUE VALVE VALVE * Each circuits of loads in wiring diagram are all same. 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 55: Exploded View

    A020 A010 A242 A051 A030 A040 A241 A052 A240 A200 A060 A173 A080 A061 A244 A190 A210 A151 A160 A230 A220 A171 A160 A170 COLD(BLUE) HOT(ORANGE) COLD(BLUE) A182 HOT/COLD A270 A185...
  • Page 56 5-2. THE EXPLODED VIEW OF OUT CASE ASSEMBLY : Non-Service Part F005 F004 F002 F070 F001 F003 For Pump F020 F027 F100 For Non-Pump F040 F020 F021...
  • Page 57 5-3. THE EXPLODED VIEW OF TUB ASSEMBLY : Non-Service Part K000 K010 K080 K040 K050 K110 K250 K102 K240 K170 For Non-Pump K230 For Pump K200 K270 K210 For Non-Pump K201 K305 For Pump K300...

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