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LG DLGX3371W Service Manual
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LG DLGX3371W 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 : DLEX 3570* DLGX 3571*
DLEX 3370* DLGX 3371*
U.S.A. Website: http://us.lgservice.com
Canadian Website: http://lg.ca
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  • Page 1 U.S.A. Website: http://us.lgservice.com Canadian Website: http://lg.ca ELECTRIC & GAS DRYER SERVICE MANUAL CAUTION READ THIS MANUAL CAREFULLY TO DIAGNOSE PROBLEMS PROPERLY AND TO PROVIDE QUALITY SERVICE SAFELY ON THESE DRYERS. MODEL : DLEX 3570* DLGX 3571* DLEX 3370* DLGX 3371*...
  • 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

    CONTENTS 1. SPECIFICATIONS ....................... 4 2. FEATURES AND BENEFITS ....................6 3. INSTALLATION INSTRUCTIONS ..................6 4. DRYER CYCLE PROCESS ....................13 5. COMPONENT TESTING INFORMATION ................. 14 6. MOTOR DIAGRAM AND SCHEMATIC ................17 7. WIRING DIAGRAM ......................18 8.

  • Page 4: Specifications

    SPECIFICATIONS DLEX 3570* DLGX3571* Model DLEX3370* DLGX3371* 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 5 DLEX 3570* DLEX3370* ITEM REMARK DLGX 3571* DLGX3371* Blue White / Blue White / Stainless Silve/ Color Stainless Silver Candy Apple Red Material and Finish Top Plate Powder coating Door Trim Chrome 120 V / 240 V / 60 Hz (26 A) Elec.

  • Page 6: Features And Benefits

    FEATURES AND BENEFITS DLEX 3570* / DLGX3571* DLEX3370* / DLGX3371* Cycle Selector Knob LED Display Power Start/Pause Dry Level Temp. Control Time Dry Signal Button Button Button Button Button Button 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...
  • 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. Connection with a Power Supply Cord. 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...
  • 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. Connect Gas Supply Pipe 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: Dryer Cycle Process

    DRYER CYCLE PROCESS DLEX3470* / DLGX3471* Conditions of operation and termination Default Drying Cooling Wrinkle care Cycle Temp- Display erature Level time Electro- Temp- Default Temp- Time sensor Control time Control** 20 min STEAM FRESH MID HIGH Saturation 5 min 45±5˚C 66±4˚C ADJUSTABLE...

  • Page 14: Component Testing Information

    COMPONENT TESTING INFORMATION CAUTION When checking components, turn the power off and discharge voltage. Component Test Procedure Check result Remark 1. Thermal cut off Measure resistance of terminal If thermal fuse is open must • Heater case- to terminal be replaced Safety ∞...
  • Page 15 Component Test Procedure Check result Remark 7. Heater Measure resistance of the • Electric type following terminal Ω Terminal: 1 (COM) - 2 Resistance value: 10 Ω Terminal: 1 (COM) - 3 Resistance value: 10 Ω Terminal: 2 - 3 Resistance value: 20 Ω...
  • Page 16 Component Test Procedure Check result Remark 13. Outlet Thermostat Measure resistance of terminal • Gas type (Auto reset) to terminal • Gas funnel ∞ Open at 203 ± 41°F (95 ± 5°C) Resistance value Ω Continuity < 1 Close at 158 ± 41°F (70 ± 5°C) •...

  • Page 17: 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 18: Wiring Diagram

    WIRING DIAGRAM MAIN PCB DISPLAY PCB Smart Modem Connector SMART READY model only STEAM model only MAIN PCB DISPLAY PCB Smart Modem Connector SMART READY model only STEAM model only...
  • Page 19 Main PCB Picture ( P/N : EBR62707645(Electric) EBR62707646(Gas)) <Electric> <Gas>...

  • Page 20: Steam Function

    STEAM FUNCTION 8-1. Steam Cycle Guide TEMP. FABRIC MAXIMUM DEFAULT TIME FABRIC TYPE STEAM CONTROL LEVEL STATE AMOUNT Comforter STEAM Single (1 each) Bedding STEAM SANITARY SANITARY (39 minutes) Children’s clothing 3 lbs. Comforter Single (1 each) STEAM FRESH (20 minutes) Shirts* 5 each 8 lbs.

  • Page 21: Troubleshooting

    8-2. Troubleshooting POSSIBLE CAUSES SOLUTIONS PROBLEM • Water supply error. • Check steam feeder drawer: (1) Make sure steam feeder is filled with water to MAX line. indicator lights is on (2) Make sure steam feeder is seated properly during the drying and drawer is fully closed.

  • Page 22: Display Fault/Error Codes

    POSSIBLE CAUSES SOLUTIONS PROBLEM Cannot see steam • This is normal. • Steam is released at different stages of the cycle vapor at the for each option. beginning of cycle. • MORE TIME pressed. • Pressing the MORE TIME button adjusts the The display shows: load size from 1to 5 articles or a big load indicated by...
  • Page 23 Android OS version, the NFC activation To use the Tag On function: process may differ. Refer to the manual of 1. Download the LG Smart Laundry&DW App to your smart phone for details. your smart phone. 2. Turn on the NFC (Near Field Communication) •...
  • Page 24 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 25 <Electric Dryer> Table 1. Resistance for Thermistor Temperature.
  • Page 26 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 27 <Gas Dryer>...
  • Page 28 <Gas Dryer> Table 1. Resistance for Thermistor Temperature.
  • Page 29 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 30 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 31 Defective Belt Unplug UNIT / Check belt switch Not tumbling Switch 1.Lever open Resistance value 1Ω Case1. Motor doesn’t operate at all. 2.Lever push (Close) Case2. Motor operates but stops soon. Go to Resistance value ∞ Check the door Power on, press the start is not closed button.

  • Page 32: 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 33: Installation Test (Exhaust Check)

    9-2 Installation Test (Exhaust check) Once you have completed the installation of the dryer, use this test to make sure the condition of the exhaust system is adequate for proper operation of the dryer. This test should be performed to alert you to any serious problems in the exhaust system of your home.
  • Page 34 Check the Error Code before you call for service Error Code Possible Causes Solutions Temperature sensor failure Turn off the dryer and call for service. Humidity Sensor failure. Turn off the dryer and call for service. Electric dryer power cord is not con Check the power supply or the nected correctly, or house power connection of power cord to...

  • Page 35: Diagnostic Test

    DIAGNOSTIC TEST 1. This TEST should be used for factory test /service test. Do not use this DIAGNOSTIC TEST other than specified. 2. Activating the heater manually with the door open may trip the Thermostat attached to the heater, therefore do not activate it manually.

  • Page 36: Test 1 120V Ac Electrical Supply

    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 37 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 Heater 2...
  • Page 38 < 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 39 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 40 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 41 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 42 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 43 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 44 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 45 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 46: 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 47 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 48: 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 49 PANEL DRAWER ASSEMBLY Pull out the drawer Lift out the steam feeder Lift the hook and pull out the drawer. PCB ASSEMBLY Remove 2 screws on the frame body. Open the cover guide and disconnect the connectors.
  • 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 GUIDE ASM GUIDE ASM Remove 3 screws on the frame body. Push the guide assembly to the back side and then lift it. Separate 2 hoses from the pump and generator. Lift a pump and generator up.
  • Page 53 FRAME BODY & PANEL FRAME BODY FRAME & PANEL FRAME Remove 4 screws on the frame body. and then disassemble the frame body. Remove 4 screws on the panel frame and then remove it.
  • Page 54 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 55 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 56 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 57 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 58: Exploded View

    EXPLODED VIEW 13-1. Control Panel and Plate Assembly A211 A210 A130 A120 A140 A110...

  • Page 59: Panel Drawer Assembly And Guide Assembly

    13-2. Panel Drawer Assembly and Guide Assembly K503 K508 K502 K506 K501 K505 K504 K507 A090 A172 A161 A160 A171 A170 A350...
  • Page 60 13-3-1. Cabinet and Door Assembly: Electric Type A590 A700 A800 A570 A390 A560 A610 A131 A330 A600 A305 A325 A500 A320 A300 A530 A510 A310 A520 A525 A430 A540 A308 A420 A400 A460 A410 A450...
  • Page 61 13-3-2. Cabinet and Door Assembly: Gas Type A590 A700 A800 A390 A131 A330 A600 A305 A550 A325 A500 A320 A300 A530 A510 A310 A520 A525 A430 A540 A308 A420 A400 A460 A410 A450...

  • Page 62: Drum And Motor Assembly: Electric Type

    13-4-1. Drum and Motor Assembly: Electric Type F200 K400 K420 K410 K120 K140 K100 K130 K250 K251 K320 K310 K330 K335 K340 K222 K221 K620 K224 K336 K230 K210 K250 K360 K350 K610 K560 K550 K251 K240 K530 K660 F140 K640 K651 K515...

  • Page 63: Drum And Motor Assembly: Gas Type

    13-4-2. Drum and Motor Assembly: Gas Type F200 K420 K400 K410 K120 K140 K100 K130 K250 K251 K320 K310 K330 K335 K340 K222 K221 K620 K224 K230 K336 K210 K250 K360 K350 K610 K560 K550 K251 K240 K530 K660 K651 K515 K640 K655...
  • Page 64 JUL. 2015 PRINTED IN KOREA P/No.: MFL62119979...

This manual is also suitable for:

Dlgx3571 seriesDlex3370 seriesDlgx3371 seriesDlex3570 series

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