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LG WM2701H Series, Service Manual

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LG WM2701H Series Service Manual Download Page 23

22

ERROR

SYMPTOM

CAUSE

LOCKED

MOTOR

ERROR

8

EEPROM

ERROR

9

POWER

FAILURE

10

• The connector (3-pin, male, white) in the MOTOR

HARNESS is not connected to the connector 
(3-pin, female, white) of STATOR ASSEMBLY. 

• The electric contact between the connectors 

(3-pin, male, white) in the MOTOR HARNESS 
and 4-pin, female, white connector in the MAIN PWB
ASSEMBLY is bad or unstable.

• The MOTOR HARNESS between the STATOR

ASSEMBLY and MAIN PWB ASSEMBLY is cut (open
circuited).

• The hall sensor is out of order/defective.

• EEPROM is out of order.

Displayed only when the START/PAUSE button is first
pressed in the QC Test Mode.

• The washer experienced a power failure.

Summary of Contents for WM2701H 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 WM2701H ...

Page 2: ...P No MFL30599132 JAN 2009 PRINTED IN KOREA ...

Page 3: ...UBLESHOOTING 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 31 9 COMPONENT TESTING INFORMATION 37 9 1 FILTER ASSEMBLY LINE FILTER 37 9 2 DOOR LOOK SWITCH ASSEMBLY 38 9 3 STATOR ASSEMBLY 40 9 4 PUMP MOTOR ASSEMBLY 43 9 5 INLET VALVE ASSEMBLY 44 9 6 HEATER ASSEMBLY 45 9 7 THERMISTOR ASSEMBLY 46 9 8 VIBRATIO...

Page 4: ...FF CHILD LOCK ELECTRIC POWER CONSUMPTION REVOLUTION SPEED WASHING DRAIN MOTOR WASH HEATER WASH SPIN 12 5 5 Prewash Rinse Spin Extra Rinse Water Plus Stain Cycle Wash Rinse Optimizer Tub Clean 14 5 116 psi 100 800 kPa Electronic 3 87 4 5 IEC 27 W X 293 4 D X 3811 16 H 5013 16 D door open up to 19 hours PTC Solenoid 10 steps by sensor Incorporated Incorporated Incorporated Incorporated 280 W 80 W 10...

Page 5: ...Opening Tilted drum and extra large opening make it possible to load and unload clothing more easily 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 Detection Automatically detects the load and optimizes the washing time Built in Heater In...

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: ... motor is in the process of intertial rotating through the operation is paused 2 6 CHILD LOCK Use this option to prevent unwanted use of the washer Press and hold PRE WASH button for 3 seconds to lock unlock control When child lock is set CHILD LOCK lights and all buttons are disabled except the Power button You can lock the controls of the washer while washing ...

Page 8: ...FICATION ACCESSORIES Wrench Tie strap Option to secure drain hose to standpipe inlet hose or laundry tub Hot Cold 1 each Hose Non skid pads Caps 4 for covering shipping bolt holes Elbow Bracket for securing drain hose ...

Page 9: ... 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 Insert...

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 WM2701H ...

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

Page 14: ...tting is on Press repeatedly to adjust the volume of the Beeper Option Button PREWASH Use this option for loads that need pretreatment It adds 16 minutes prewash and a spin cycle RINSE SPIN Use this option to rinse and then spin EXTRA RINSE This option provides an additional rinse WASH RINSE OPTIMIZER Use the WASH RINSE OPTIMIZER button to select the water level and detergent mount automatically b...

Page 15: ...ms such as blankets and comforters Warm Cold Medium No Spin Warm Warm Hot Cold Cold Cold Low Heavy Light Normal Perm Press Dress shirts pants wrinkle free clothing poly cotton blend clothing table cloths Warm Cold High No Spin Low Warm Warm Hot Cold Cold Cold Medium Heavy Light Normal Cotton Normal Cotton linen towels shirts sheets jeans mixed loads Heavy soiled Cotton Fabrics Towels and cotton Co...

Page 16: ...Medium Heavy Light Normal Hand Wash Wool Items labeled hand washable Cold Cold Medium No Spin Warm Cold Warm Warm Warm Cold Warm Warm Low Light Normal Speed Wash Lightly soiled clothing and small loads Hot Cold No Spin Low Medium High Cold Cold Warm Cold Warm Warm Extra High Normal Heavy Light NOTE To protect your garments not every wash rinse temperature spin speed soil level or option is availab...

Page 17: ...CK 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 TUB CLEAN A buildup of detergent residue can occur in the wash tub over time and can lead to a mildew or musty smell The TUB CLEAN cycle is specially designed to remove this buildup Press and hold the EXTRA RINSE button for 3 seconds to activate this cycle The d...

Page 18: ...he drum rotates If water temperature becomes lower than selected because of re supplied water the heating starts again 7 Washing Fuzzy Logic decides washing time according to the laundry load water temperature and other factors 8 Drainage A pump motor drains the water from the drum After sensing drained water amount by water level frequency spin starts When a heating course is selected stay coolin...

Page 19: ...supply Water supply for rinse process E Rinse Rinsing process F Last drainage After spin finishes and power is not supplied to motor the drum rotates by remaining spin power If rinse hold is selected the drainage is not proceeded after rinse finishes G Disentangling The same as item 9 H Intermittent spin The same as item A I Main spin1 The same as item B J Main spin2 At the end of a main spin the ...

Page 20: ...19 6 PROGRAM CHART Towels 70 20 24 60 35 73 75 73 50 63 52 20 20 100 10 25 Bright whites Heavy Duty Soak Wash Small Load Cold Care ...

Page 21: ...SH button simultaneously The digits indicate the water level frequency x 1 kHz So for example a display indicating 241 a Water level frequency of 241 x 1 kHz 24 1 kHz 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 Turns on all lamps and locks the door Tumble clockwise Low speed Spin High speed Spin It will be take about 2minits to be high spe...

Page 22: ...the preset water level within 25 minutes The load is too small The appliance is tilted Laundry is gathered to one side Non distributable things are put into the drum Door not all the way closed Loose electrical connections at Door switch and PWB Assembly The DOOR SWITCH ASSEMBLY is out of order Not fully drained within 10 minutes The SENSOR SWITCH ASSEMBLY is out of order The THERMISTOR is out ord...

Page 23: ...ntact between the connectors 3 pin male white in the MOTOR HARNESS and 4 pin female white connector in the MAIN PWB ASSEMBLY is bad or unstable The MOTOR HARNESS between the STATOR ASSEMBLY and MAIN PWB ASSEMBLY is cut open circuited The hall sensor is out of order defective EEPROM is out of order Displayed only when the START PAUSE button is first pressed in the QC Test Mode The washer experience...

Page 24: ...23 8 3 TROUBLESHOOTING SUMMARY ...

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 NA2 NA4 BL3 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: ...2 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 Note Env...

Page 27: ...tor assembly Replace 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 co...

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 DELAY WASH button simultaneously is the water level frequency over 21 3kHz Refer to 7 3 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: ...cuit 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 Main LED Yes No Is LED on while the power is on Replace the DI...

Page 33: ...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 34: ...nside of drum and start QC 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 stable If it is not stable adjust feet ...

Page 35: ...ce the vibration sensor Reconnect or repair the connector Replace the TRANS CABLE Yes No Is each terminal open Check the all terminal of the vibration sensor s connector Is the connector connected to MAIN PWB assembly connected or assembled BL2 Is Electrical connection correct Refer to 9 10wiring diagram Replace the MAIN PWB ASSEMBLY Note Chances that the cause occurs from the main controller are ...

Page 36: ... 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 37: ...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 38: ...he 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 FUSE RD1 WH1 LI L2 RI CI C2 C3 3 2 1 3 2 1 Test points and Result Test Points Result WH 1 to RD 3 WH 3 to RD 1 0 Ω 0 Ω 3 1 WH1 3 1 RD1 ...

Page 39: ...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 40: ...39 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 41: ... 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 42: ...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 43: ...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 44: ... 4 1 2 3 4 BL3 SB 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 2...

Page 45: ...t or cold 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 WH NA4 VT GY YL BL BL4 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 Each circuits of loads in wir...

Page 46: ...YL F U S E F U S E 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 Test Points Result ...

Page 47: ...NA3 BL BN WH 1 2 1 2 1 2 1 2 WH WASH THERMISTOR STEAM GENERATOR THERMISTOR 1 2 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 or Steam Generator Wash Thermistor 2 1 Steam generator Thermistor 1 2 1 2 ...

Page 48: ...47 Result Wash 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 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 ...

Page 49: ...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 50: ...SCL Function Test points Result The vibration sensor is designed to decrease the vibration of the washing machine It is attached to the tub cover of washing machine It estimates the vibration of washing machine s tub during drying And it reduces the vibration and the noise of washing machine Original Test Points 1 to 3 Result 5 0 Vdc Remarks Voltage Input Vibration Sensor 1 3 ...

Page 51: ... and repairing the parts 2 Pull the top plate backward and upward as shown 4 Pull out the drawer and unscrew 2 screws 5 Remove one screw 8 Disassemble the Display PWB Assembly 6 Lift the side the control panel assembly and pull it out 7 Unscrew the 8 screws from the control panel assembly 3 Disconnect the Display PWB assembly connector from trans cable ...

Page 52: ...51 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 53: ... 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 ...

Page 54: ...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 55: ... 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 56: ...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 57: ...arate 2 connectors from the heater Loosen the nut and pull out the heater THERMISTOR 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 CIRCULATION HOSE PUMP HOSE BELLOWS 1...

Page 58: ...57 WHEN FOREIGN OBJECT IS STUCK BETWEEN DRUM AND TUB Disassemble the cabinet cover Separate the heater from the tub Remove any foreign objects wire coin etc by inserting a long bar in the opening 1 2 3 ...

Page 59: ...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 60: ...A103 A152 A130 A131 A390 A310 A300 A133 A303 A200 A140 A150 A110 F210 A104 A105 A106 F215 A141 A151 A153 Printed materials Description Owner s Manual Energy Label Loc No Tech Sheet Service Manual Quick Start Guides Installation Sheet G001 G002 G003 G004 G006 G007 The following parts are not illustrated Non Skid Pasd G010 A410 A175 ...

Page 61: ...1 K115 K111 K110 K140 K320 K131 K510 F140 K411 K410 K150 F315 F465 K125 F466 F467 F463 K160 K130 K530 F464 F310 K141 K121 K122 F145 F468 K550 K540 F461 K520 K105 K346 K348 K344 K347 K135 K611 K610 K349 K342 K340 K315 K571 K572 K570 K142 K195 K190 K117 ...

Page 62: ...61 11 3 DISPENSER ASSEMBLY F300 F220 A275 A276 F225 F441 F430 F160 F120 F130 F432 F462 F227 F226 F322 F323 F321 F170 F180 Inlet Valve Filter SVC COLD BLUE HOT ORANGE ...

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