LG DLEX3900 Series Service Manual
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LG DLEX3900 Series Service Manual

Electric & gas dryer
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ELECTRIC & GAS DRYER
SERVICE MANUAL
CAUTION
READ THIS MANUAL CAREFULLY TO DIAGNOSE
PROBLEMS PROPERLY AND TO PROVIDE
QUALITY SERVICE SAFELY ON THESE DRYERS.
MODEL : DLEX3900* DLGX3901*
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.
Copyright ©
2018
LG Electronics Inc. All rights reserved. Only training and service purposes.
U.S.A. Website: http://us.lgservice.com
Canadian Website: http://lg.ca
DLEX3700* DLGX3701*
DLE3500* DLG3501*
1
CONFIDENTIAL

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Summary of Contents for LG DLEX3900 Series

  • Page 1 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.
  • Page 2 IMPORTANT SAFETY NOTICE The information in this service guide is intended for use by individuals possessing skill and experience in electrical, electronic, and mechanical appliance repair. Any attempt to repair a major appliance may result in injury to persons, and property damage. The manufacturer or seller cannot be responsible for the interpretation of this information, nor can it assume any liability in connection with its use.

  • Page 3: Table Of Contents

    13-3-2. CABINET AND DOOR ASSEMBLY: GAS TYPE ..........13-4-1. DRUM AND MOTOR ASSEMBLY: ELECTRIC TYPE ......... 13-4-2. DRUM AND MOTOR ASSEMBLY: GAS TYPE ............ Copyright © 2014 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 4: Specifications

    SPECIFICATIONS DLEX3900* DLGX3901* Model DLEX3700* DLGX3701* DLE3500* DLG3501* Name Electric and Gas Dryer Power supply Please refer to the rating label regarding detailed information 27” (W) X 30” (D) X 38 / ” (H), 51” (D with door open) Size 68.6 cm (W) X 76.1 cm (D) X 98.3 cm (H), 129.7 cm (D with door open) - Normal Cycle IEC 7.4 cu.ft.

  • Page 6: Features And Benefits

    FEATURES AND BENEFITS DLEX3900* / DLGX3901* DLEX3700* / DLGX3701* DLE3500*/ DLG3501* INSTALLATION INSTRUCTIONS Dryer Rack Installation Instructions Open the door Put the dryer rack into Check and be sure that the Hold the dryer rack the drum front of the rack is properly with both hands.
  • Page 7 Stacking Kit Installation Instructions To ensure safe and secure installation, please observe the instructions below. WARNING Secure the side bracket to the washer with a screw on the back of the bracket. Repeat Steps 2, 3, and 4 for the other side. Do not attempt this alone! At least two people are required to lift and position the dryer on top of a washing...
  • Page 8 Pedestal Installation Instructions Place the dryer on the • • For dryer Drawer divider (1) Wrench (1) pedestal. Make sure • • the front and back feet Screws (18) † T-clips (4) †† are in the correct positions. The dryer feet will fit into the innermost positions as shown.
  • Page 9 3-1. Connecting Electric Dryers Review the following options to determine the appropriate electrical connection for your home 4-wire receptacle 4-wire connection : Direct wire (NEMA type14-30R) Important :Grounding through the neutral conductor is prohibited for (1) new branch-circuit installations, (2) mobile homes, and (3) recreational vehicles, and Use the instructions under option 1 if your home (4) areas where local codes prohibit grounding through home has a 4-wire receptacle (NEMA type 14-30R).
  • Page 10 3-wire connection : Direct wire : 4-wire connection with a power supply cord. Important : Grounding through the neutral conductor is prohibited for (1) new branch-circuit installations, lf your local codes or ordinances do not allow the (2) mobile homes, and (3) recreational vehicles, and use of a 3 wire connection, or you are installing (4) areas where local codes prohibit grounding through your dryer in a mobile home, you must use a...
  • Page 11 : Optional 3-wire : 3-Wire connection with connection. a power supply cord • If your local codes or ordinances do not allow the lf your local codes or ordinances permit the connection of a frame-grounding conductor to the connection of a frame-grounding conductor to the neutral wire, use the instructions under this neutral wire, use these instructions.
  • Page 12 3-2. Connecting The Gas Supply For further assistance, refer to section on Gas Requirements. 1. Make certain your dryer is equipped for use with the 3. Connect to gas supply pipe using a new flexible type of gas in your laundry room. Dryer is equipped stainless steel connector.
  • Page 13 3-3. Connect Inlet Hose 21.8 150~800...
  • Page 14 DRYER CYCLE PROCESS DLEX3900* / DLGX3901* Default Conditions of operation and termination Drying Cooling Wrinkle care Cycle Temp- Display erature Level time Electro- Temp- Default Temp- Time sensor Control time Control** 10 min STEAM FRESH MID HIGH Saturation 5 min 45±5˚C 66±4˚C ADJUSTABLE...
  • Page 15 DRYER CYCLE PROCESS DLEX3700* / DLGX3701* Default Conditions of operation and termination Drying Cooling Wrinkle care Cycle Temp- Display erature Level time Electro- Temp- Default Temp- Time sensor Control time Control** 10 min STEAM FRESH MID HIGH Saturation 5 min 45±5˚C 66±4˚C ADJUSTABLE...

  • Page 16: Dryer Cycle Process

    DRYER CYCLE PROCESS DLEX3500* / DLGX3501* Default Conditions of operation and termination Drying Cooling Wrinkle care Cycle Temp- Display erature Level time Electro- Temp- Default Temp- Time sensor Control time Control** NORMAL MEDIUM BEDDING 55 min Saturation 45±5˚C 5 min 60±4˚C Sensor ADJUSTABLE...

  • Page 17: Component Testing Information

    COMPONENT TESTING INFORMATION Auto reset -31°F (-35°C) Same shape as outlet thermostat. 4. LED Lamp Schematic: If the lamp is turned on It is not by connecting is normal. measured by multimeter because V is 3.2V Measure resistance of the following terminal 1) Door open Terminal: COM - NC (1-3)
  • Page 19 Ω Ω Electric type 15. Inlet. valve Measure resistance of the Following terminal Left picture -.plate...

  • Page 20: Motor Diagram And Schematic

    MOTOR DIAGRAM AND SCHEMATIC When checking components, turn the power off and discharge voltage. NOTE Contact On / Off by Centrifugal Switch STOP MODE RUN MODE (When Motor does not operate) (Motor operates) Centrifugal switch Centrifugal switch (Pull Drive forward)

  • Page 21: Wiring Diagram

    WIRING DIAGRAM (ELECTRIC DRYER) (GAS DRYER)
  • Page 22 Main PCB Picture <Electric> <Gas>...

  • Page 23: Steam Function

    STEAM FUNCTION 8-1. Steam Cycle Guide DEFAULT TEMP. FABRIC FABRIC MAXIMUM STEAM TIME CONTROL LEVEL STATE TYPE AMOUNT Comforter Single Bedding (1 each) STEAM 39 minutes SANITARY™ Children’s 3 lbs. clothing Single Comforter (1 each) 20 minutes STEAM Shirts* 5 each FRESH™...
  • Page 26 Symptom Check Point 1. Not heating 1.Check Electric Wiring. 2.Check the motor operation. 3.Voltage of the Main PWB. 4. Check Heater element’s Resistance. <Electric Dryer>...
  • Page 27 <Electric Dryer> Table 1. Resistance for Thermistor Temperature.

  • Page 28: Troubleshooting

    Not heating (Electric) Unplug UNIT / Check heater Check lint Filter One or both elements. Heater elements Terminal: 1(COM) – 2 = 10Ω Clean if needed. defective. Explain to owner responsibility Terminal: 1(COM) – 3 = 10Ω Terminal: 2 – 3 = 20Ω formance and safety reason.
  • Page 29 <Gas Dryer>...
  • Page 30 <Gas Dryer> Table 1. Resistance for Thermistor Temperature.
  • Page 31 Not heating (Gas) Unplug UNIT / Check gas valve Defective gas valve Check lint Filter Valve1 terminal > 1.5kΩ~2.5kΩ Clean if needed. Valve2 terminal > Explain to owner responsibility to 1.5kΩ~2.5kΩ and safety reason. Unplug UNIT / Check Igniter Defective Igniter Resistance value = 50~800Ω...
  • Page 32 Symptom Check Point 2. Not tumbling 1.Check Electric Wiring. 2.Check the Door properly closed. 3.Voltage of the Main PWB. 4. Check Blower thermostat’s Resistance <Electric / Gas Dryer>...

  • Page 33: Flow Sensor Function

    FLOW SENSOR FUNCTION 9-1 Flow Sensor This FlowSense function detects the clogging or blocking of ducts. Clogged duct vents or hoses decrease efficiency in drying cloths. Clogged vents can also cause fire. This function alerts you to the need of cleaning the duct. When the alarm about Duct clogging is displayed, clean the duct or call a servicer to clean them.

  • Page 34: Installation Test (Exhaust Check)

    9-2. Installation Test (Duct Check) Once you have completed the installation of the Press the START/PAUSE button. dryer, use this test to make sure the condition of the The dryer will start the test, which will last a exhaust system is adequate for proper operation of few minutes.
  • Page 35 9-3 Troubleshooting for flow sensor dryer • Check the Error Code before you call for service Error Code Possible Causes Solutions or tE2 • Temperature sensor failure • • Humidity Sensor failure. • • Electric dryer power cord is not •...

  • Page 36: Diagnostic Test

    DIAGNOSTIC TEST...
  • Page 37 Test 1 When measuring power, be sure to wear insulated gloves to avoid an electric shock. No power was applied to controller. Display (LCD or LED) off. Dryer power on, collector plugged in. Check the Check the outlet, is the voltage fuse or circuit 110 V ~ 125 V AC? breaker...
  • Page 38 When measuring power, be sure to wear insulated gloves to avoid an electric shock. Check the t ab relays connection properly. With dryer power on; connector linked to controller. 1. Power Connection < Table1 > : Connection of the Tap Relay with Heater (Electric) Tab Relay 1 Tab Relay 2 Heater 1 Remark...
  • Page 39 < Table 2 > : Connection of Tap Relay with PCB ASSEMBLY (Gas) Remark Color Harness Blue Wire Check the matching color between harness wire and tap relay. Black Connector Housing (Black housing – black tap relay) Black Wire Connector Housing Tap Relay 1 3.
  • Page 40 Test 2 Before measuring resistance, be sure to turn the power off and discharge voltage. Caution (When discharging, contact the metal plug of power cord with the ground.) During diagnostic test, tE1 and tE2, an error occurs. Trouble Symptom During operation, the heater does not turn off. Difference between actual and sensed temperature is significant.
  • Page 41 Test 3 Before measuring resistance, be sure to turn the power off and discharge voltage. Caution (When discharging, contact the metal plug of power cord with ground wire.) Trouble Symptom Drum dose not rotate; no blower function, no heater function. Measurement Condition Turn the dryer’s power off, then measure resistance.
  • Page 42 Test 4 NOTE: This test has two parts. The best test of the moisture sensing system is done in the diagnostic mode. This FUNCTIONAL TEST will test the sensor bars, wiring harness and PCB operation. If the results of this test are normal, the sensor system and PCB response are normal.
  • Page 43 Test 5 NOTE: This test has two parts. The best test of the door switch system is done in the diagnostic mode. This FUNCTIONAL TEST will test the door switch, wiring harness and PCB operation. If the results of this test are normal, the door switch system and PCB response are normal.
  • Page 44 Test 6 Before measuring resistance, be sure to turn the power off, and do voltage discharge. (When discharging, contact the metal plug of the power cord with a ground line.) While operating, Heating will not work. Drying time takes longer. After turning the power off, measure the resistance.
  • Page 45 Test 7 Caution When measuring power, be sure to wear insulated gloves to avoid electric shock. While operating, heating will not work. Trouble Symptom Drying time takes longer Measurement Condition With dryer power on Power on & start (Normal cycle) When measuring Valve 1 voltage, •...
  • Page 46 Test 8 Before measuring resistance, be sure to turn power off, and do voltage discharge. Caution (When discharging, contact the metal plug of power cord with the ground wire.) Trouble Symptom During the diagnostic test, E5 error occurs. Measurement Condition Turn the dryer’s power off, then measure resistance.

  • Page 47: Change Gas Setting (Natural Gas, Propane Gas)

    CHANGE GAS SETTING (NATURAL GAS, PROPANE GAS) Warning Initially, The burner is set for natural gas at the factory. The propane orifice Natural Gas mode is set. Propane Gas Orifice is on sale as a Service conversion kit is sold as a service part to autherized servicers only. Part to authorized servicers only.
  • Page 48 GAS VALVE FLOW START KEY PUSH VALVE 1 ON (VALVE 2 OFF) IGNITER ON IGNITER TEMPERATURE ABOUT FLAME DETECT OPEN VALVE 2 ON GAS IGNITION FLAME DETECT CLOSE DRYING VALVE 2 OFF START CLOSE OPEN GAS IGNITION...

  • Page 49: Disassembly Instructions

    DISASSEMBLY INSTRUCTIONS Unplug the dryer before servicing. WARNING ! TOP PLATE When you disassemble the top plate, be sure to disconnect the dryer from its electrical supply. Protect your hands and arms from sharp edges when working. To reduce the risk of Injury to persons adhere to all industry recommended safety procedures including the use of long sleeved gloves and safety glasses.
  • Page 50 WARNING ! CONTROL PANEL ASSEMBLY When you disassemble the control panel, be sure to disconnect the dryer from its electrical supply. Protect your hands and arms from sharp edges when working. To reduce the risk of Injury to persons adhere to all industry recommended safety procedures including the use of long sleeved gloves and safety glasses.
  • Page 51 COVER CABINET WARNING ! When you disassemble the door switch connector, be sure to disconnect the dryer from its electrical supply. Protect your hands and arms from sharp edges when working. To reduce the risk of Injury to persons adhere to all industry recommended safety procedures including the use of long sleeved gloves and safety glasses.
  • Page 52 WARNING ! TUB DRUM FRONT When you disassemble the lamp connector, be sure to disconnect the dryer from its electrical supply. Protect your hands and arms from sharp edges when working. To reduce the risk of Injury to persons adhere to all industry recommended safety procedures including the use of long sleeved gloves and safety glasses.
  • Page 53 WARNING ! DRYER EXHAUST CHANGE Before performing this exhaust installation, be sure to disconnect the dryer from its electrical supply. Protect your hands and arms from sharp edges when working inside the cabinet. To reduce the risk of Injury to persons adhere to all industry recommended safety procedures including the use of long sleeved gloves and safety glasses.
  • Page 54 FILTER ASSEMBLY Remove the filter. Remove 3 screws. Remove the cover grid. Disconnect the electrode sensor. BLOWER HOUSING Disassemble the top plate. Remove the cabinet cover and front bulkhead. Remove the drum assembly. Remove 2 screws and cover (Air guide). Remove the bolt and washer.
  • Page 55 AIR DUCT Disassemble the top plate. Remove the cover cabinet. Remove the filter. Remove the cover guide. Remove 2 screws. Remove the air duct. ROLLERS Disassemble the top plate. Remove the cover cabinet and front bulkhead. Remove the drum assembly and front bulkhead. Disconnect the air duct from the front bulkhead.
  • Page 56 Replacing the Inlet Hose 1. Press and hold the release ring to remove the hose from the nozzle. 2. Remove the 7 screws from the rear cover. 3. Lift the rear tub off the support and pull it out. 4. Replace the hose, and assemble the cable tie holder in the rear tub.
  • Page 57 5. Remove the hose in generator. 6. Remove the cable tie holder in the rear tub. 7. Replace the hose, and assemble the cable tie holder in the rear tub. 8. After connection the hose to the generator, install the clamp.
  • Page 58 1. Remove the six connectors from the generator. 2. Remove the thermistor screw from the generator. 3. Remove the steam harness cable tie holder in the rear tub. 4. Replace the steam harness and assemble the cable tie holder in the rear tub. 5.
  • Page 59 1. Remove the cover and screws. 2. To remove the rear tub, take off the steam 3. Remove the bracket from the generator first. Then remove the rear tub. steam generator. 4. Reassemble the steam generator and bracket. 5. Assemble the cover and screws.

  • Page 60: Exploded View

    EXPLODED VIEW 13-1. Control Panel and Plate Assembly A211 A210 A120 A140 A110...

  • Page 61: Cabinet And Door Assembly: Electric Type

    13-2-1. Cabinet and Door Assembly: Electric Type A590 A700 A800 A570 A390 A560 A130 A610 A131 A330 A305 A600 K730 A325 A500 A320 A300 A530 A310 A520 A525 A430 A495 A540 A308 A420 A400 A460 A410 A450...
  • Page 62 13-2-2. Cabinet and Door Assembly: Gas Type A590 A700 A800 A130 A390 A131 A330 A600 A305 K730 A550 A325 A500 A320 A300 A530 A310 A520 A525 A430 A495 A540 A308 A420 A400 A460 A410 A450...

  • Page 63: Drum And Motor Assembly: Electric Type

    13-3-1. Drum and Motor Assembly: Electric Type K740 K742 K400 K120 F200 K743 K509 K502 K507 K505 K145 K741 K410 K140 K100 K720 K411 K250 K130 K252 K251 K310 K320 K330 K221 K340 K620 K230 K210 K250 K360 K350 K610 K560 K550 K251...

  • Page 64: Drum And Motor Assembly: Gas Type

    13-3-2. Drum and Motor Assembly: Gas Type K400 F200 K507 K740 K509 K502 K742 K505 K120 K743 K142 K410 K741 K140 K720 K411 K100 K130 K252 K250 K251 K320 K310 K330 K335 K221 K340 K230 K620 K336 K210 K250 K360 K350 K610 K560...
  • Page 65 MAY. 2018 PRINTED IN KOREA P/No.: MFL69290420...

This manual is also suitable for:

Dlgx3901 seriesDlex3700 seriesDlgx3701 seriesDle3500 seriesDlg3501 seriesDlex3900b

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