LG WM3700H A /01 Series Service Manual Download

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MODELS : WM3700H

/02

WM3700HVA /01

WASHING MACHINE

SERVICE MANUAL

READ THIS MANUAL CAREFULLY TO DIAGNOSE

PROBLEMS CORRECTLY BEFORE SERVICING THE UNIT.

CAUTION

CONFIDENTIAL

Any reproduction, duplication, distribution (including by way of email, facsimile or other electronic means), publication, modification, copying or

transmission of this Service Manual is STRICTLY PROHIBITED unless you have obtained the prior written consent of the LG Electronics entity

from which you received this Service Manual. The material covered by this prohibition includes, without limitation, any text, graphics or logos in

this Service Manual.

Summary of Contents for WM3700H A /01 Series

Page 1: ...ther electronic means publication modification copying or transmission of this Service Manual is STRICTLY PROHIBITED unless you have obtained the prior written consent of the LG Electronics entity from which you received this Service Manual The material covered by this prohibition includes without limitation any text graphics or logos in this Service Manual Copyright 2016 2018 LG Electronics Inc A...

Page 2: ...Safety Caution 19 7 2 Error Mode Summary 19 20 7 3 Troubleshooting With Error 21 27 7 5 Before using the Tag On function 3 7 4 Troubleshooting Else 28 3 8 Component Testing Information 3 8 1 Filter Assembly Line Filter 3 8 2 Door Look Switch Assembly 3 36 8 3 Stator Assembly 3 8 4 Pump Motor Assembly 8 5 Inlet Valve Assembly 8 6 9 Disassembly Instructions 4 10 Exploded View 5 5 11 Wiring Diagram 5...

Page 3: ...ash Add Garments Fresh Care Cold Wash Extra Rinse Rinse Spin Water Plus Incorporated 14 5 142 PSI 100 980kPa Electronic 4 5 DOE 27 W X 293 4 D X 3811 16 H 51 D door open up to 19 hours PTC Solenoid 10 steps by sensor Incorporated Incorporated Incorporated Incorporated 240W 80W 1000W 46 rpm 0 1 300 rpm Blue White Silver AC 120V 60 Hz 189 6lb 86 kg To reduce the risk of injury you must adhere to all...

Page 4: ...ects the load and optimizes the washing time Child Lock The child lock prevents children from pressing any button to change the settings during operation SMART DIAGNOSIS TM Should you experience any technical difficulty with your washing machine is capable of producing multiple distinct different motions for optimal washing performance with very little noise and vibration The motor assembly also c...

Page 5: ...the water in the tub drains to a certain level water temperature washing time rinsing time the best washing performance spin rhythm time load size NEURO FUZZY selected washing temperature SENSING EFFECT PROCESSING DETERMINATION 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...

Page 6: ...ady in operation The Child Lock will remain engaged until the end of the current cycle To disengage the Child Lock Press and hold the Pre Wash button for 3 seconds 2 7 NFC Tag On Function The Tag On feature is only available to smartphone users who are running on the Android Operating System The smartphone must also be equipped with NFC technology To use the Tag On feature an appropriate smartphon...

Page 7: ...SG G G G G G G G G G G G G G G U w G Gh w G G z G w G k G G G k G G k t Gk G w j G G k G s G k G w O G P z Gr O G P h u T G j G G G G G G l G G O G G G P p Gh G v Gh y Gh GO G P ˍGG y G G G G UGp G G G G GsnG U G zaG U U V o V G G w Gu ˍG YX mkZ X GaGo G G ˍG YX mkZ X GaGj G G Copyright 2016 2017 LG Electronics Inc All rights reserved Only training and service purposes 3 PARTS IDENTIFICATION ...

Page 8: ...functions correctly STANDARD INSTALLATION The appliance should be installed as follows Remove the 4 shipping bolts with the supplied wrench Remove the lower bolts fist It is easier that way Keep the shipping bolts and spanner for future use Insert the 4 caps provided into the hole Turn clockwise to raise counterclockwise to lower Turn the leveling feet to adjust the appliance REMOVE THE SHIPPING B...

Page 9: ... prevent leaks Install the inlet hose to correct temperature water tap Otherwise it cause drips on the drawer panel handle and drawer panel HOW TO CONNECT THE INLET HOSE CONNECT THE DRAIN HOSE Make sure that the hose is not twisted The end of the drain hose should be placed less than 96 from the floor Avoid submerging the end of the hose Copyright 2016 2017 LG Electronics Inc All rights reserved O...

Page 10: ...lockwise 5 Check the automatic reverse 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 Listen for a click to determine if the door is unlocking 8 Press the START PAUSE button 9 Water removal If SERVI...

Page 11: ...ervice purposes Copyright 2016 2018 LG Electronics Inc All rights WM3700H A 01 ENGLISH 5 OPERATION 5 1 CONTROL PANEL FEATURE S Copyright 2016 2017 LG Electronics Inc All rights reserved Only training and service purposes 5 OPERATION ...

Page 13: ...er and heating Extra Rinse This option will add an extra rinse cycle to the selected cycle Rinse Spin Use this option to rinse detergent from load Child Lock Use this option to prevent unwanted use of the washer or to keep cycle settings from being changed while the washer is operating Water Plus To add water during wash and rinse cycle event wrinkles Wash Temp Spin speed Soil Level Signal Button ...

Page 15: ...urposes Control Lock Control Lock Remote Start Use a smart phone to control your appliance remotely Also it is possible to monitor your cycle operation so you know how much time is left in the cycle Wi Fi Connect Use this option for connecting to the internet through your home Wi Fi network ...

Page 16: ...re 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 cooling process is performed to decrease...

Page 17: ...se Rinsing process 15 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 16 Disentangling The same as item 9 17 Intermittent spin The same as item 10 18 19 20 21 22 Main spin1 The same as item 11 Main spin2 At the end of a main spin the spin speed will reach the s...

Page 18: ...pcb and Wi Fi module Please change this service part WASH RINSE DELAY WASH Turns on all lamps and locks the door 18 Copyright 2016 2017 LG Electronics Inc All rights reserved Only training and service purposes There is a problem Wi Fi module Please change this service part There is no problem with Wi Fi module This is wi fi program version Wi Fi version can be change 6 TEST MODE ...

Page 20: ...g and service purposes Suds Error If the washing machine detects too many suds it displays this error code and adds Suds Reducing cycle This adds about two hours to the cycle time If too many suds are detected during spinning the washing machine stops to help prevent leaking ...

Page 23: ... magnet cracked 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 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 MAIN PWB ASSEMBLY Check the IPM in the controller No Is LE ERROR displayed t Gk Copyright 2016 2017 LG Electronics Inc All rights res...

Page 24: ...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 Is dE ERROR displayed Copyright 20...

Page 25: ...FLOW ERROR Note Installation check list KHQ RX WRXFK ERWK Delay Wash DQG Soil EXWWRQ VLPXOWDQHRXVO LV WKH ZDWHU OHYHO IUHTXHQF RYHU Copyright 2016 2017 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 26: ...s the resistance of the pressure sensor out of range pin 1 pin 3 21 23 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 Is PE ERROR displayed Copyright 2016 2017 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 27: ...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 DISPLAY PWB ASSEMBLY Display PWB Connecting connector...

Page 30: ...wash Compartment 4 Main Wash Compartment Is the detergent caked or hardened Is water supplied Check the wiring No Are receptacles correctly connected to the terminals of the INLET VALVE ASSEMBLY Put the detergent in the correct place Clean the dispenser Yes Yes No Pre wash Main wash Detergent Copyright 2016 2017 LG Electronics Inc All rights reserved Only training and service purposes 3UH ZDVK OHD...

Page 31: ...rawer Put it in the correct compartment Clean the cap and container No Yes Yes Yes Secure the bolt Is there friction noise coming from the motor Check hall sensor Replace If defective Then check stator Replace if necessary Check rotor for broken magnets Replace rotor if necessary Yes No Yes 1 Liquid chlorine Bleach Compartment 2 Liquid fabric Softener Compartment 3 Prewash Compartment 4 Main Wash ...

Page 32: ...uble connecting to the Wi Fi network it may be too far from the router Purchase a Wi Fi repeater range extender to improve the Wi Fi signal strength The network connection may not work properly depending on the Internet service provider The Wi Fi connection may not connect or may be interrupted because of the home network environment If the appliance cannot be registered due to problems with the w...

Page 33: ... discharge suffi ciently WARNING Wiring diagram Circuit in the MAIN PWB Wiring Diagram Vac MAIN PWB A S SEMBLY FUSE RD1 WH1 LI L2 R I C I C2 C3 3 2 1 3 2 1 Test points and Result T est Points Result WH 1 to RD 3 WH 3 to RD 1 0 0 Copyright 2016 2017 LG Electronics Inc All rights reserved Only training and service purposes 5 8 COMPONENT TESTING INFORMATION ...

Page 34: ...r 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 performance and two authorization processes are...

Page 35: ...Test Points 2 to 4 3 to 4 4 to 5 2 to 4 Result 700 1500 60 90 Infinity 120 Vac Remarks At 77 F 25 C At 77 F 25 C Voltage Input 68 Copyright 2016 2017 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 36: ... Result Windings steps in either direction Thereare36poleson the stator 12permanent magnetsspacedaround the rotor There are no brushesto wear out Unlike a more traditional brushlessmotor the rotor surrounds the stator rather than being attached to it Test Points Result 1 to 2 2 to 3 3 to 1 5 15 5 15 5 15 WINDINGS 1 2 3 Copyright 2016 2017 LG Electronics Inc All rights reserved Only training and se...

Page 37: ...37 ...

Page 40: ...Result tolerance 5 39 5 k 26 1 k 12 1 k 8 5 k 3 8 k 2 8 k 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 Copyright 2016 2017 LG Electronics Inc All rights reserved Only training and service purposes 40 ...

Page 41: ...5 Lift the side of the control panel assembly and pull it out 6 Disconnect the control panel PCB connector from the cabling 7 Unlock all 7 locking snaps hooks from the control panel assembly 8 Remove rotary Knob and disassemble the control panel PCB assembly 9 Disconnect control panel PCB connectors from the Display PCB 9 DISASSEMBLY INSTRUCTIONS Copyright 2016 2017 LG Electronics Inc All rights r...

Page 42: ...ights reserved Only training and service purposes 1 Disconnect the POWER connector and lift locking hook in highlighted direction 2 Unlock all three highlighted hooks 3 Remove the protective cover 4 Push PCB in shown direction and take out 5 Disconnect the connectors ...

Page 43: ...ispenser Unscrew 1 screws from the back of the cabinet Disassemble the 4 connectors from the valves Wire Color Yellow Housing BR BK White Housing OR BK Blue Housing BL BK Red Housing GY BK 1 2 3 4 1 3 2 Slide dispenser backwards to remove 4 5 7 6 Copyright 2016 2017 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 44: ... Disassemble both connectors from the noise filter 2 Unlock the locked site 3 Pull out noise filter in highlighted direction Copyright 2016 2017 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 45: ...nscrew the screw from the filter cover Reach up to the ceiling of the pump case cover and pull forward to remove Unscrew the screw from the lower side of the cabinet cover 1 2 3 4 Copyright 2016 2017 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 46: ...r switch connector Disassemble the clamp assembly Disassemble the gasket Lift and separate the cabinet cover NOTE When assembling the cabinet cover connect the door switch connector 5 6 7 8 9 10 11 Copyright 2016 2017 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 47: ...et pliers Unscrew the 2 screws Disassemble the door upward NOTE Reconnect the connector after replacing the door switch assembly 1 3 1 2 2 DOOR DOOR LOCK SWITCH ASSEMBLY Copyright 2016 2017 LG Electronics Inc All rights reserved Only training and service purposes Screw 2 Screw 1 Slide in upper direction Take out door assembly ...

Page 48: ...s reserved Only training and service purposes PUMP Disassemble the cabinet cover Separate the pump hose the bellows assembly from the pump assembly Unscrew the 2 screws and disassemble the pump assembly follow red arrow direction 1 2 3 PUMP HOSE BELLOWS ...

Page 50: ...3 A101 A100 A430 A440 A220 A200 A303 A310 A300 A133 A140 A130 A390 A131 A410 A455 A485 A150 A450 F210 F215 A110 A175 Copyright 2016 2017 LG Electronics Inc All rights reserved Only training and service purposes 50 A151 A141 A154 A152 A153 A201 EXPLODED VIEW A156 A108 A155 F111 ...

Page 51: ...51 K143 K123 K6 10 K360 K6 11 K200 K4 11 K4 10 K320 K340 K344 K342 K346 F1 45 F4 68 K520 K540 K550 F468 F464 F140 K310 K464 K516 K135 K501 K530 F315 K461 K190 K100 K130 F463 K439 K132 ...

Page 52: ...DISPENSER ASSEMBLY F160 F300 F301 F323 F322 F462 F321 F227 F226 F220 F225 F430 F120 F432 F170 Copyright 2016 2017 LG Electronics Inc All rights reserved Only training and service purposes 52 ...

Page 53: ...Delay Wash Soil Level Water Level 255 Empty 213 Flood Level Press Delay Wash Spin Speed Motor RPM Press Delay Wash Wash Temp Temp Celsius THERMISTOR 5 to 4 5 VDC Ohms Test 50KΩ to 60KΩ Room Temperature BK to HW WASH 3 Φ Motor Ohm Tests 5 to 15 Ohms 1 to 2 1 to 3 2 to 3 PS Voltage Tests 2 5 to 3 0 VDC O R to V OR to SB Frequency 26 KHZ to 23 KHZ Ohm Check 20Ω to 25Ω V to SB INLET VALVES 0Ω 1 2 kΩ D...

Page 54: ...P No MFL68588942 ...

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