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LG WM3988H*A Series, Service Manual

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LG WM3988H*A Series Service Manual Download Page 29

28

DOOR OPEN ERROR

Is             displayed?

Yes

Is the connector connected
to door switch or main PWB
disconnected?

Reconnect or
repair
the connector

Yes

No

Is there clicking sound once
or twice when the

START/PAUSE

button is

pressed to start the cycle?

Replace the
PCB
ASSEMBLY.

No

Is DOOR SWITCH
ASSEMBLY broken?

Replace the
DOOR
SWITCH
ASSEMBLY.

No

Yes

Does the spring of Latch
Hook actuate?

Replace
Door
Assembly

Yes

No

[Note] Environmental check list

1) The machine must operate with all the doors

completely closed and locked.

2) The washing area must operate with a water

temperature not higher than 45 Celsius and
must not have more amount of supplied water
than it should.

Summary of Contents for WM3988H*A Series

Page 1: ...WASHING MACHINE SERVICE MANUAL CAUTION READ THIS MANUAL CAREFULLY TO DIAGNOSE PROBLEMS CORRECTLY BEFORE SERVICING THE UNIT Website http biz lgservice com MODEL WM3988H A ...

Page 2: ...AUG 2007 PRINTED IN KOREA P No MFL30599110 ...

Page 3: ...ROUBLESHOOTING 21 8 1 SAFETY CAUTION 21 8 2 ERROR MODE SUMMARY 21 8 3 TROUBLESHOOTING SUMMARY 23 8 4 TROUBLESHOOTING WITH ERROR 24 8 5 TROUBLESHOOTING ELSE 33 9 COMPONENT TESTING INFORMATION 38 9 1 FILTER ASSEMBLY LINE FILTER 38 9 2 DOOR LOOK SWITCH ASSEMBLY 39 9 3 STATOR ASSEMBLY 41 9 4 PUMP MOTOR ASSEMBLY 44 9 5 INLET VALVE ASSEMBLY 45 9 6 HEATER ASSEMBLY 46 9 7 THERMISTOR ASSEMBLY 47 9 8 STEAM ...

Page 4: ...psi 100 800 kPa CONTROL TYPE Electronic WASH CAPACITY cu ft 3 47 4 0 IEC DIMENSIONS 27 W X 29 3 4 D X 3811 16 H 5013 16 D door open DELAY WASH up to 19 hours DOOR SWITCH TYPE PTC Solenoid WATER LEVEL 10 steps by sensor LAUNDRY LOAD SENSING Incorporated ERROR DIAGNOSIS Incorporated AUTO POWER OFF Incorporated CHILD LOCK Incorporated RLM ENABLE Incorporated STEAM Incorporated ELECTRIC POWER CONSUMTI...

Page 5: ...more easily Steam Washing and SteamFreshTM Steam Washing features upgraded washing performance with low energy and water consumption SteamFreshTM cycle removes wrinkles from dry clothes RollerJets Washing ball enhances the wash performance and reduces damage to the clothing The jets spray and help tumble clothes to enhance washing performance while maintaining fabric care Automatic Wash Load Detec...

Page 6: ...m then proceeds Spinning does not proceed until the water in the tub drains to a certain level 2 4 DOOR CONTROL The door can be opened by pulling the door handle whenever washer is not in operation When the cycle is completed the DOOR LOCKED light will turn off If a power failure has occurred while in operation the door will unlock after 5 minutes Clicking sounds can be heard when the door is lock...

Page 7: ...s of the washer while washing 2 8 WATER CIRCULATION When washing and rinsing function of shower at the upper part of Gasket When washing it continuously operates for 3 minutes and intermittently When rinsing it continuously operates after completion of water supply 2 9 STEAM For tough stained clothes sick room linens or baby clothes Steam Wash is available with Sanitary Bulk Large Perm Press Cotto...

Page 8: ...COLD STEAM DOOR LOCK EST TIME REMANING 5 NORMAL CHILD LOCK DELAY WASH 1 21 Included Accessories Hot and Cold Water Hoses Wrench for removing shipping bolts and adjusting leveling feet Tie Strap for securing drain hose Elbow Bracket for securing drain hose Caps 4 for covering shipping bolt holes ...

Page 9: ...he appliance to see whether it functions correctly STANDARD INSTALLATION The appliance should be installed as follows 1 2 3 4 5 6 6 REMOVE THE SHIPPING BOLTS Remove the 4 shipping bolts with the supplied wrench Do first lower side to remove easily Turn the leveling feet to adjust the appliance Turn clockwise to raise counterclockwise to lower Keep the shipping bolts and spanner for future use Inse...

Page 10: ...rely to prevent leaks CONNECT THE DRAIN HOSE CONNECT POWER PLUG The end of the drain hose should be placed less than 96 from the floor Connect the power plug to the wall outlet Avoid connecting several electric devices as doing so may cause a fire Make sure that the hose is not twisted Avoid submerging the end of the hose ...

Page 11: ...se rotation 4 Check the water supply Check if water is supplied through the detergent dispenser 7 Check the drain and spin functions Power off and the power on Press the SPIN SPEED button Press the START PAUSE button Check the spin and drain functions 8 Press the START PAUSE button 9 Water removal If SERVICE is needed during check remove the remaining water by pulling out the hose cap 2 Press the ...

Page 12: ...11 5 OPERATION 5 1 CONTROL PANEL FEATURES WM3988HWM ...

Page 13: ...Cycle selector knob to select the cycle designed for different types of fabric and soil levels Use this button to Start Stop the washer It shows elapsed time of the cycle the washer is operating Power Button Status Indicator Start Pause Cycle Selector Knob ...

Page 14: ...LUS Add extra water to the wash and rinse cycles for superior results Select a water temperature based on the type of load you are washing To change the spin speed press the Spin Speed button repeatedly to cycle through available options To change the soil level press the Soil Level button repeatedly until the desired setting is on Press repeatedly to adjust the volume of the Beeper To set the typ...

Page 15: ...gh No Spin Low Warm Warm Hot Cold Cold Cold Medium Heavy Light Normal Cotton Normal Cotton linen towels shirts sheets jeans mixed loads Warm Cold Extra High No Spin Low Medium Warm Warm Hot Cold Cold Cold High Heavy Light Normal AllergieneTM Cotton underwear pillow covers bed sheets baby wear Extra High No Spin Low Medium High Delicates Dress shirts blouses nylons sheer or lacy garments Cold Cold ...

Page 16: ...n for 3 seconds to activate or deactivate CHILD LOCK CHILD LOCK will be shown in the display and all controls are disabled except the ON OFF button The washer can be locked during a cycle DRUM LIGHT The drum is equipped with a blue LED light that illuminates when the washer is turned on This light automatically turns off when the door is closed and the cycle starts To turn on the light during a cy...

Page 17: ...and temperatures used the ALLERGIENE cycle is not recommended for wool silk leather or any other delicate or temperature sensitive items HAND WASH WOOL Only woolen items that are designated as Machine Washable should be washed in this washing machine Wash only small loads for optimum fabric care less than 8 lbs Use only neutral wool safe detergents should be used Only a small quantity of detergent...

Page 18: ...17 6 WIRING DIAGRAM PROGRAM CHART ...

Page 19: ...18 ...

Page 20: ...s None 1 time 2 times 3 times 4 times 5 times 6 times 7 times 8 times 9 times 10 times 11 times 12 times 13 times 14 times 15 times Turns on all lamps and locks the door Tumble clockwise Low speed Spin High speed Spin Inlet valve for prewash turns on Inlet valve for main wash turns on Inlet valve for hot water turns on Inlet valve for steam turns on Inlet valve for bleach turns on Tumble countercl...

Page 21: ...ure 7 4 HOW TO CHECK THE WATER LEVEL FREQUENCY The digits indicate the water level frequency Press the WASH RINSE and SOIL LEVEL button simultaneously For example if the display indicate 058 the water level frequency is 20 58 X 0 1 25 8 kHz Duct temperature Steam temperature Fan Motor RPM ...

Page 22: ... Discharge plastic pack when delivering or keeping it ERROR SYMPTOM CAUSE WATER INLET ERROR Correct water level 24 6kHz is not reached within 8 minutes after water is supplied or it does not reach the preset water level within 25 minutes 1 UNBALANCE ERROR The load is too small The appliance is tilted Laundry is gathered to one side Non distributable things are put into the drum 2 DRAIN ERROR Not f...

Page 23: ... of order defective 8 EEPROM is out of order Displayed only when the START PAUSE button is first pressed in the Load Test Mode 9 POWER FAILURE After the power supply is stopped while washing machine is working the power is supplied rapidly 10 DRY HEATING ERROR The connector 3 pin male white in the FAN MOTOR HARNESS is not connected to the connector 3 pin female white of FAN MOTOR ASSEMBLY The elec...

Page 24: ...10 Vdc 10 Vdc Remark Voltage Input Pulsing signal Pulsing signal Pin1 to Pin2 Pin1 to Pin3 Pin1 to Pin4 Pin2 to Pin4 Pin3 to Pin4 Result Test Points 700 1500 Ω 60 90 Ω Infinity 120 Vac Remark At 77 25 At 77 25 Voltage Input Pin2 to Pin4 Pin3 to Pin4 Pin4 to Pin5 Pin2 to Pin4 steam generator Result Test Points 0 Ω 0 Ω 0 Ω 0 Ω WH Pin1 to RD Pin3 WH Pin3 to RD Pin1 YL Pin1 to WH Pin3 YL Pin2 to WH Pi...

Page 25: ... Yes Is the voltage of the inlet valve connector 120 V AC Check the all terminal of INLET VALVE ASSEMBLY while the power is on Replace the INLET VALVE ASSEMBLY No Yes Is the connector connected to MAIN PWB assembly disconnected or dis assembled NA4 BL3 WH Reconnect or repair the connector No Yes Yes Is Electrical connection correct Refer to 9 5 wiring diagram Replace the MAIN HARNESS No No After c...

Page 26: ...ange WH pin1 BL3 pin1 After remove Terminal Position Assurance TPA of connector check as follows Pump running 120V 5 Stopped Motor Pump 0 1V Method 1 Press the Power button while the SPIN SPEED button and SOIL LEVEL button is pressed simultaneously 2 Press Start Pause button 1 time Pump slow speed running 2 times Pump mid speed running 3 times Pump high speed running 4 times Stop the Motor Pump No...

Page 27: ...place the THERMISTOR ASSEMBLY Yes No Check the trans of water infiltration into thermistor terminal Does the water infiltrate thermistor terminal Note Chances that the cause occurs from the main controller are very little Sensing part of the circuit tE consists of only resistors and capacitors Replace the THERMISTOR ASSEMBLY Yes Steam generator heater Wash heater Is the connector connected to ther...

Page 28: ...Drive Is rotor magnet cracked Hall sensor Motor Drive Hall Sensor part of wire part of motor Motor Yes No Yes Yes Magnet Replace the STATOR Is the resistance values in the range of 5 to 15 Ω U V V W W V U 1 V 2 W 3 After pull out the RD4 connector check the terminal of the connector in wire Red 3P male No Replace the Hall sensor Is hall sensor out of order Refer to 9 3 Stator assembly Hall sensor ...

Page 29: ...t the cycle Replace the PCB ASSEMBLY No Is DOOR SWITCH ASSEMBLY broken Replace the DOOR SWITCH ASSEMBLY No Yes Does the spring of Latch Hook actuate Replace Door Assembly Yes No Note Environmental check list 1 The machine must operate with all the doors completely closed and locked 2 The washing area must operate with a water temperature not higher than 45 Celsius and must not have more amount of ...

Page 30: ...ly In the DRUM assembly Yes Is the washing machine installed at an angle Adjust the height of washing machine to be kept horizontally Yes No Is displayed Yes When you press both WASH RINSE button and SOIL LEVEL button simultaneously is the water level frequency over 21 3kHz Refer to 7 4 Check the AIR CHAMBER and the tube clogged No Does the inlet valve work when the power is not applied Replace th...

Page 31: ...ed or disassembled Reconnect or repair the connector No No Yes Is the resistance of the pressure sensor out of range pin 1 pin 3 21 23 Ω 10 Replace the pressure switch No Yes Is the AIR CHAMBER and the tube clogged Replace the MAIN PWB assembly Fix the air chamber and remove the foreign material Yes ...

Page 32: ...cted to FAN MOTOR disconnected or disassembled Reconnect or repair the connector Yes Yes Replace the MAIN PWB assembly Is the voltage of the Fan motor connector 20 30 V DC Check the all terminal of FAN MOTOR Assembly while the machine is dry course In case of measuring by multimeter multitester 0 20V No No Is the connector connected to heater disconnected or disassembled Reconnect or repair the co...

Page 33: ...d Reconnect or repair the connector Yes No Is the voltage of the Tab relay white connector on PWB Assembly Main 0 V Replace the MAIN PWB assembly Yes No After you separated condensing bellows from cabinet can you find any foreign material in condensing duct and condensing bellows Remove the foreign material Yes No Remove the foreign material after disassemble the DRY FAN ASSEMBLY and DRY duct uppe...

Page 34: ...e circuit breaker Yes No Is the current rating of multi outlet power strip enough Avoid connecting several electric devices Is the supplied voltage 120V AC 10 15 Alternate with explanation Yes Yes No Is the connector connected to PCB Noise filter disconnected or disassembled Reconnect or repair the connector No Replace the MAIN PWB ASSEMBLY Yes No Is LED on while the power is on Replace the DISPLA...

Page 35: ...WB Display PWB disconnected or disassembled Reconnect or Repair the connector Yes Is the display PCB broken check the buzzer sound and LED light while push the button Replace the DISPLAY PWB ASSEMBLY Yes Is the button of panel stuck Repair the button Yes No No ...

Page 36: ...table Put an unbalance part rubber inside of drum and start LOAD test mode and run in high spin Refer to section 7 2 When the machine is spinning in high speed verify that it is stable If you do not have the unbalance part put 4 5 to 6 5 lbs 2 to 3 kg of clothing Once loaded press power Rinse Spin and the start pause button in sequence When the machine is spinning in high speed verify that it is s...

Page 37: ... the dispenser Put the detergent in the correct place YES YES YES YES NO NO NO Is water supplied Is the detergent caked or hardened Are receptacles correctly connected to the terminals of the INLET VALVE ASSEMBLY Has detergent been put in the correct compartment of the dispenser ...

Page 38: ...tive Then check stator Replace if necessary Check rotor for broken magnets Replace rotor if necessary YES NO YES YES YES YES YES NO NO NO Is water supplied Are the plugs correctly connected to the terminals of the INLET VALVE ASSEMBLY Is liquid detergent softener bleach put in the correct compartment of the drawer Is the liquid detergent softener bleach cap clogged Is the motor bolt loosened Is th...

Page 39: ... Component be sure to turn the power off and do voltage discharge sufficiently WARNING Wiring diagram Circuit in the MAIN PWB Wiring Diagram Vac MAIN PWB ASSEMBLY WH RD LI L2 RI CI C2 C3 1 1 2 2 3 3 3 3 2 2 1 1 Test points and Result Test Points Result WH 1 to RD 3 WH 3 to RD 1 0 Ω 0 Ω 1 3 3 1 RD WH ...

Page 40: ...ough terminal 3 4 PTC solenoid will make the door locked Door lock is detected when switches in terminal 4 5 are set closed CAM rotation will forcibly clear off the connection The maximum allowable number of impulse authorizations is 2 Upon the third authorization of the impulse the position of CAM goes back to the door open position Authorizing the impulse occurs in 4 5 seconds upon input for max...

Page 41: ...40 Test points Result Test Points 2 to 4 3 to 4 4 to 5 2 to 4 Result 700 1500 Ω 60 90 Ω Infinity 120 Vac Remarks At 77 F 25 C At 77 F 25 C Voltage Input 2 3 4 5 ...

Page 42: ... 5 2 3 4 1 2 3 4 Hb Function Test points Windings Result Windings 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 brushes to wear out Unlike a more traditional brushless motor the rotor surrounds the stator rather than being attached to it Test Points Result 1 t...

Page 43: ...o the Hall Sensor use the following steps 1 Unplug power cord 2 Remove rear washer panel 3 Locate Hall sensor connector on the stator behind the rotor 4 Place meter leads on terminals 5 to 4 white to gray 5 Plug in power cord close door and press power button DO NOT PRESS START 6 You should measure 10 to 15 Vdc If 10 to 15 Vdc is present control board white wire and gray wire are OK If not follow ...

Page 44: ...s but does not pulse or change Hall sensor has failed and must be replaced IF zero 0 voltage is measured on either test check red blue wires for continuity Repair or replace harness as needed Voltage Testing Hall Sensor from the Main PCB Assembly 7 To measure output signal voltage from the hall sensor carefully move test leads to terminals 1 to 4 blue and gray Slowly rotate motor rotor by hand You...

Page 45: ... 4 1 2 3 4 BL3 SKY SB SB BK BN BN DRAIN PUMP CIRCULATION PUMP BK Object Function Test points Result Each circuits of loads in wiring diagram are all same Two pump motors are used to drain the tub and to circulate the water detergent solution Drain Pump Drain Pump Circulation Pump Circulation Pump Test Points Result 1 to 2 10 20 Ω Test Points Result 1 to 2 18 30 Ω T P For Drain For Circulation 1 2 ...

Page 46: ... water valve solenoids to meet the selected water temperature After pull out the connector of defective valve check the resistance Test points 1 2 Result 0 8 1 2 kΩ Wiring Diagram MAIN WASH AG VALVE PRE WASH BLEACH HOT VALVE 1 2 1 2 1 2 1 2 1 2 RD BL BL RD NA BL WH YL NA VI GYOR BL WH BL3 4 3 2 1 1 2 3 1 2 3 4 3 2 1 4 3 2 1 4 3 2 1 COMMON BK MIAN PWB INLET VALVE DRY VALVE 1 2 Each circuits of load...

Page 47: ...R Function Test points Result 1 The Wash Heater is designed to raise the wash water to the desired temperature selection during certain wash cycles 2 The Steam generator heater is designed to make the water to the steam during steam cycles Wash Heater Steam Generator Heater Each circuits of loads in wiring diagram are all same Wash Heater Steam Generator Heater Dry Heater Test Points Result 1 to 2...

Page 48: ...STOR DA1 DA2 Dry Wash AG 1 2 1 2 1 2 1 2 1 2 3 3 3 4 5 6 1 5V 5V R R R R C C C C 2 3 4 5 6 Function Test points The thermistor temperature sensor is used to monitor water temperature in the tub Steam Generator Dry duct and Condensing duct 1 2 2 1 2 Wash Thermistor Dry Thermistor Dry Thermistor 2 1 2 1 2 3 Steam generator Thermistor ...

Page 49: ...C At 140 F 60 C At 158 F 70 C At 203 F 95 C At 221 F 105 C Steam generator Thermistor Test Points 1 to 2 Result tolerance 5 39 5 kΩ 26 1 kΩ 12 1 kΩ 8 5 kΩ 3 8 kΩ 2 8 kΩ 2 1 kΩ 1 4 kΩ 1 0 kΩ 0 7 kΩ 0 4 kΩ Remarks At 86 F 30 C At 104 F 40 C At 140 F 60 C At 158 F 70 C At 203 F 95 C At 221 F 105 C At 241 F 116 C At 266 F 130 C At 293 F 145 C At 320 F 160 C At 356 F 180 C ...

Page 50: ...IC 2 DC5V 5V 1 2 3 1 2 3 1 2 3 1 2 3 4 4 Original Test points 1 Steam generator 1 Construction of steam generator Inlet valve that controls supplying water Water level sensor that sense amount of water supply Thermistor ASSEMBLY the sense inner temperature of Steam generator Heater ASSEMBLY that heats water supply Steam generator CASE that is container of water supply nozzle and hose of water supp...

Page 51: ...evel sensor thermistor or heater cannot be replaced individually Diagnosis is limited to determining malfunction and replacing as an assembly The steam generator does not have to be removed from the machine to be drained Be sure to let the water cool to avoid a burn Have a hose available to slip onto the connector or a large towel to catch the water so it doesn t run down into the machine cabinet ...

Page 52: ...s pressed It goes off when the door is closed and the washer starts operation It remains off when the door is locked It can be turned on while the washer is in operation by pressing the RINSE SPIN button for 3 seconds The lamp will turn off automatically 4 minutes later It comes on when the washing cycle is finished and goes off 4 minutes later Original Test Points 3 to 1 Result 16 5 Vdc Remarks V...

Page 53: ...52 10 DISASSEMBLY INSTRUCTIONS CONTROL PANEL ASSEMBLY ...

Page 54: ...53 MAIN PWB ASSEMBLY 1 Disconnect the POWER connector and SENSOR SWITCH ASSEMBLY 2 Remove the Protective cover 3 Disconnect the connectors 4 Unscrew 1 screw on the back 5 Remove the Main PWB ...

Page 55: ...le the top plate assembly 2 Pull out the drawer 1 Disassemble two or three connectors from the NOISE FILTER 2 Unscrew a screw from the TOP BRACKET 4 Unscrew the Clamp nut at the lower part of the dispenser 5 Disassemble the 4 connectors from the valves 6 Unscrew 2 screws from the back of the cabinet 3 Push out the DISPENSER ASSEMBLY after unscrewing 2 screws 1 2 3 4 5 6 ...

Page 56: ...ews from upper of the canbinet cover 2 Unscrew the screw from filter cover 3 Put a flat screwdriver or putty knife into the hinge slots at the bottom of the cover and pry it out 4 Unscrew the screw from the lower side of the cabinet cover ...

Page 57: ... assembly 7 Tilt the cabinet cover 8 Disconnect the door switch connector 9 Lift and separate the cabinet cover 10 Disassemble the clamp assembly 11 Disassemble the gasket NOTE When assembling the CABINET COVER connect the door switch connector ...

Page 58: ...hinge and pull out the hinge cover Unscrew a screw from the lower side of door Disassemble the door upward DOOR Open the door and disassemble the CLAMP ASSEMBLY Unscrew the 2 screws DOOR LOCK SWITCH ASSEMBLY Be careful The door is heavy NOTE Reconnect the connector after replacing the DOOR SWITCH ASSEMBLY ...

Page 59: ...ection Disassemble the cabinet cover Separate 2 connectors from the heater Loosen the nut and pull out the heater Disassemble the cabinet cover Unplug the white connector from the thermistor Pull it out by holding the bracket of the thermistor CAUTION When assembling the heater insert the heater into the heater clip on the bottom of the tub Tighten the fastening nut so the heater is secure ...

Page 60: ...ate the heater from the tub Remove any foreign objects wire coin etc by inserting a long bar in the opening LAMP ASSEMBLY TOP PLATE ASSEMBLY Unscrew 2 screws on the back of the top plate Pull the top plate backward and upward as shown Disconnect the connector Disassemble the lamp assembly ...

Page 61: ...tor 1 Unscrew the 2 screws from the tub bracket 2 Remove the 6 bolts on the stator 3 Unplug the 2 connectors from the stator 1 Disassemble the damper hinges from the tub and base NOTE If you pull the dampers apart the must be replaced If you do not separate them they can be re used ...

Page 62: ...1 To check out the fault diagnosis of TSG you can pull out the plug and let the water drain away 2 Be cautious in case of the TSG is hot 1 Remove the housing attached to the TSG Heater Water level frequency sensor Thermistor 2 Remove the screw of the TSG and Body Frame ...

Page 63: ...62 3 Taking out the screws of Body Frame 2 ea 5 Remove the body frame and then separate the TSG from the washer 4 Separate the hoses from the TSG ...

Page 64: ...L PANEL ASSEMBLY 11 EXPLODED VIEW A105 A106 A133 A310 A300 A303 A485 A455 A410 A152 A151 A130 A140 A131 A153 A390 A201 A155 A440 A430 A100 A101 A104 A102 F110 F215 F210 A450 A111 A110 A154 A141 A150 A103 A220 A200 M410 M400 ...

Page 65: ... K320 K510 K512 F464 K131 K560 K340 K550 K121 F465 F315 K141 F466 K105 F467 F328 K344 F145 K345 K135 K530 F463 K130 K511 K513 F310 K123 K143 K360 K350 K351 K125 K122 F468 K520 F461 K540 K346 K342 64 11 2 DRUM TUB ASSEMBLY K115 K141 K611 K610 K117 ...

Page 66: ...F300 F220 F327 F462 A275 F432 F130 F120 F430 F160 F170 F441 F225 A276 F227 F226 F323 F322 F321 65 11 3 DISPENSER ASSEMBLY ...

Page 67: ...66 11 4 DRYER M230 M100 M210 M215 M240 M101 M220 M260 M235 M110 M111 M121 M120 K311 M310 M312 M311 M130 ...

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