LG DLEX4270 Series Service Manual
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LG DLEX4270 Series Service Manual

Electric & gas dryer
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See also: Owner's Manual
ELECTRIC & GAS DRYER
SERVICE MANUAL
CAUTION
READ THIS MANUAL CAREFULLY TO DIAGNOSE
PROBLEMS PROPERLY AND TO PROVIDE
QUALITY SERVICE SAFELY ON THESE DRYERS.
FOR LG TECHNICIAN
MODEL : Electric
DLEX4270*
U.S.A. Website: http://us.lgservice.com
Canadian Website: http://lg.ca
Gas
DLGX4271*
1

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Summary of Contents for LG DLEX4270 Series

  • 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. FOR LG TECHNICIAN MODEL : Electric DLEX4270* DLGX4271*...

  • Page 2: What To Do If You Smell Gas

    FOR LG TECHNICIAN 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

    FOR LG TECHNICIAN 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

    FOR LG TECHNICIAN SPECIFICATIONS DLEX4270* DLGX4271* Model 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 FOR LG TECHNICIAN REMARK ITEM DLEX4270* DLGX4271* Color Blue White / Stainless Silver Material and Top Plate Powder coating Finish Door Trim Chrome 120 V / 240 V / 60 Hz (26 A) Elec. Power 120 V / 208 V / 60 Hz (23 A) Supply 120 V / 60 Hz (11.5 A)

  • Page 6: Features And Benefits

    FOR LG TECHNICIAN FEATURES AND BENEFITS DLEX4270*/DLGX4271* 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 FOR LG TECHNICIAN 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.

  • Page 8: Tools Needed For Installation

    FOR LG TECHNICIAN Pedestal Installation Instructions The pedestal accessory includes: Place the dryer on the • • For dryer Drawer divider (1) Wrench (1) pedestal. Make sure • • Screws (18) † T-clips (4) †† the front and back feet are in the correct positions.
  • Page 9 FOR LG TECHNICIAN 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,...
  • Page 10 FOR LG TECHNICIAN 3-wire connection : Direct wire Option 1: 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...
  • Page 11 FOR LG TECHNICIAN Option 3: Optional 3-wire Option 2: 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...
  • Page 12 FOR LG TECHNICIAN 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

    FOR LG TECHNICIAN DRYER CYCLE PROCESS 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** HIGH STEAM FRESH 20min Saturation 66 4˚C 5min 45 5˚C...

  • Page 14: Component Testing Information

    FOR LG TECHNICIAN 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-...
  • Page 15 FOR LG TECHNICIAN Component Test Procedure Check result Remark 7. Heater Measure resistance of the • Electric type following terminal Terminal: 1 (COM) - 2 Resistance value: 10Ω Terminal: 1 (COM) - 3 Resistance value: 10Ω Terminal: 2 - 3 Resistance value: 20Ω...
  • Page 16 FOR LG TECHNICIAN 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 ≒ Continuity < 1 Close at 158 ±...

  • Page 17: Motor Diagram And Schematic

    FOR LG TECHNICIAN 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...
  • Page 18 FOR LG TECHNICIAN 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 : EBR76542925(Electric) EBR76542926 (Gas)) [Electric] [Gas]...

  • Page 20: Steam Function

    FOR LG TECHNICIAN 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. Single (1 each) Comforter...

  • Page 21: Troubleshooting

    FOR LG TECHNICIAN 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

    FOR LG TECHNICIAN 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...
  • 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 8-4. Troubleshooting with Symptom 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> Component Picture Test Point Value Main PWB Measure voltage of connector to connector ①...

  • Page 25: Electric Dryer

    <Electric Dryer> Component Picture Test Point Value Check if resistance is in the range of Table 1 when measuring resistance between ter- Thermistor Refer to Table 1 minals after separating harness from thermistor assembly connector. Table 1. Resistance for Thermistor Temperature. Air TEMP.
  • Page 26 Not heating (Electric) Check lint Filter Unplug UNIT / Check heater One or both elements. Heater elements ① Terminal: 1(COM) – 2 = 10Ω Clean if needed. defective. ② Terminal: 1(COM) – 3 = 10Ω Explain to owner responsibility ③ Terminal: 2 – 3 = 20Ω formance and safety reason.
  • Page 27 <Gas Dryer> Component Picture Test Point Value Measure voltage of connector to ① Voltage value = Main PWB connector 120Vac Tab relay(B)④-YL3① ① Igniting ② Voltage value = 0 ② Stop Resistance value = Igniter Measure resistance of terminal to terminal 50~800Ω...

  • Page 28: Gas Dryer

    <Gas Dryer> Component Picture Test Point Value ① Measure voltage of connector to Main PWB connector ① Voltage value≒ 90Vdc② BL3① - BL3② ② ① Valve On Voltage value≒ 102Vdc BL3① - BL3③ ③ ② Valve Off Measure resistance of following terminal ①Resistance value DC Valve1 ①...
  • Page 29 Not heating (Gas) Unplug UNIT / Check gas valve Defective gas valve Check lint Filter ① Valve1 terminal > 1.5kΩ~2.5kΩ Clean if needed. ① 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> Component Picture Test Point Value Measure voltage of connector to Main PWB connector ①...
  • Page 31 Defective Belt Unplug UNIT / Check belt switch Not tumbling Switch 1.Lever open ① Resistance value ＜ 1Ω Case1. Motor doesn’t operate at all. 2.Lever push (Close) Case2. Motor operates but stops soon. → Go to ★ ② Resistance value ≒ ∞ Check the door Power on, press the start is not closed...

  • Page 32: Flow Sensor Function

    FOR LG TECHNICIAN 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.

  • Page 33: Installation Test (Exhaust Check)

    FOR LG TECHNICIAN 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 FOR LG TECHNICIAN Check the Error Code before you call for service • Error Code Possible Causes Solutions Temperature sensor failure Turn off the dryer and call for • • tE1 or tE2 service. Humidity Sensor failure. Turn off the dryer and call for •...

  • Page 35: Diagnostic Test

    FOR LG TECHNICIAN 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

    FOR LG TECHNICIAN Test 1 120V AC Electrical Supply When measuring power, be sure to wear insulated gloves to Caution avoid an electric shock. Trouble Symptom No power was applied to controller. Display (LCD or LED) off. Measurement Dryer power on, collector plugged in.

  • Page 37: Power Connection

    FOR LG TECHNICIAN Caution When measuring power, be sure to wear insulated gloves to avoid an electric shock. Trouble Symptom Check the t ab relays connection properly. Measur ement Condition With dryer power on; connector linked to controller. 1. Power Connection <...
  • Page 38 FOR LG TECHNICIAN < 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)
  • Page 39 FOR LG TECHNICIAN Test 2 Thermistor Test --- Measure with Power O 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.

  • Page 40: Test 3 Motor Test

    FOR LG TECHNICIAN Test 3 Motor Test 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.

  • Page 41: Test 4 Moisture Sensor

    FOR LG TECHNICIAN Test 4 Moisture Sensor 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 Door Switch Test

    FOR LG TECHNICIAN Test 5 Door Switch Test 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 Heater Switch Test - Electric Type

    FOR LG TECHNICIAN Test 6 Heater Switch Test - Electric Type Before measuring resistance, be sure to turn the power off, and do voltage discharge. Caution (When discharging, contact the metal plug of the power cord with a ground line.) Trouble While operating, Heating will not work.

  • Page 44: Test 7 Gas Valve Test - Gas Type

    FOR LG TECHNICIAN Test 7 Gas Valve test - Gas Type 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 &...

  • Page 45: Test 8 Motor Assembly, Dc, Pump

    FOR LG TECHNICIAN Test 8 Motor Assembly, DC, Pump 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.

  • Page 46: Change Gas Setting (Natural Gas, Propane Gas)

    FOR LG TECHNICIAN CHANGE GAS SETTING (NATURAL GAS, PROPANE GAS) Changing orifices and gas valve adjustments improperly can result in an Warning explosion and/or fire. Conversion must be made by a qualified technician. Initially, The burner is set for natural gas at the factory. The propane orifice Natural Gas mode is set.
  • Page 47 FOR LG TECHNICIAN GAS VALVE FLOW START KEY PUSH IGNITER ON IGNITER TEMPERATURE ABOUT FLAME DETECT OPEN VALVE 2 ON GAS IGNITION FLAME DETECT CLOSE DRYING VALVE 2 OFF GAS IGNITION GAS V AL VE STRUCTURE Adjustment Screw START VALVE 1...

  • Page 48: Disassembly Instructions

    FOR LG TECHNICIAN 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.
  • Page 49 FOR LG TECHNICIAN PANEL DRAWER ASSEMBLY Pull out the drawer Lift out the steam feeder. Remove 2 screws on the control panel.
  • Page 50 FOR LG TECHNICIAN 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...
  • Page 51 FOR LG TECHNICIAN 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...
  • Page 52 FOR LG TECHNICIAN 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 FOR LG TECHNICIAN FRAME BODY & PANEL FRAME FRAME BODY & PANEL FRAME Remove 3 screws on the frame body. and then disassemble the frame body. Remove 4 screws on the panel frame and then remove it.

  • Page 54: Drum Assembly

    FOR LG TECHNICIAN 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...
  • Page 55 FOR LG TECHNICIAN 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

    FOR LG TECHNICIAN 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).

  • Page 57: Air Duct

    FOR LG TECHNICIAN 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.

  • Page 58: Exploded View

    FOR LG TECHNICIAN EXPLODED VIEW 13-1. Control Panel and Plate Assembly A211 A210 A213 A130 A120 A140 "The following parts are not illustrated" Description LOC NO. Printed materials * Tech Sheet G003 A110...

  • Page 59: Panel Drawer Assembly And Guide Assembly

    FOR LG TECHNICIAN 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: Cabinet And Door Assembly: Electric Type

    FOR LG TECHNICIAN 13-3-1. Cabinet and Door Assembly: Electric Type A700 A800 A570 A390 A590 A610 A131 A600 A300 A330 A308 A325 A500 A320 A300 A530 A310 A520 A525 A410 A430 A540 A495 A400 A420 A450...

  • Page 61: Drum And Motor Assembly: Electric Type

    FOR LG TECHNICIAN 13-4-1. Drum and Motor Assembly: Electric Type F200 K400 K410 K120 K140 K100 K130 K250 K251 K310 K320 K330 K338 K222 K340 K221 K620 K224 K230 K210 K250 K360 K350 K610 K560 K550 K251 K336 K335 K240...
  • Page 62 FOR LG TECHNICIAN AUG. 2012 PRINTED IN KOREA MFL62119982...

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