LG LWD3081ST Service Manual
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LG LWD3081ST Service Manual

LG LWD3081ST Service Manual

30” electric convection built-in oven
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Summary of Contents for LG LWD3081ST

  • Page 1 This Owner's Manual is provided and hosted by Appliance Factory Parts. LG LWD3081ST Owner's Manual Shop genuine replacement parts for LG LWD3081ST Find Your LG Oven Parts - Select From 10 Models -------- Manual continues below --------...
  • Page 2 삼 흥 정 판 Internal Use Only Website http://biz.lgservice.com 30” ELECTRIC CONVECTION BUILT-IN OVEN SERVICE MANUAL MODEL: LWD3081ST CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. June, 2008 Printed in Korea P/NO : MFL37118304...

  • Page 3: Safety Precautions

    SAFETY PRECAUTIONS • Repairs of the appliance should be carried out by a licensed technician only. Incorrect repairs may result in dangerous situations. If you need repairs, contact an LG Service Center or your dealer. • If the power cord is defective, it must be replaced by a qualified service agent with a UL listed range cord.

  • Page 4: Table Of Contents

    TABLE OF CONTENTS GENERAL- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1-1 ~ 1-6 •...
  • Page 5 - Removing the Vent motor - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3-6 - Removing the Thermal limiter - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3-7 - Removing the Door switch - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3-7 - Removing the Thermal limiter (Double Line Brake_Upper) - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3-8...

  • Page 6: General

    GENERAL READ ALL INSTRUCTIONS BEFORE USE READ ALL INSTRUCTIONS BEFORE USE Read and follow all instructions before using your oven to prevent the risk of fire, electric shock, injury to person, or damage when using the range. This guide don’t cover all possible conditions that may occur. For further assistance contact your service agent or manufacturer.

  • Page 7: Electrical Safety

    GENERAL READ ALL INSTRUCTIONS BEFORE USE READ ALL INSTRUCTIONS BEFORE USE SAFETY PRECAUTIONS • Be certain all packing materials are removed • Be certain your appliance is properly installed from the appliance before operating. and grounded by a qualified technician. Keep plastics, clothes, and paper away from •...

  • Page 8: Safety During Use

    GENERAL READ ALL INSTRUCTIONS BEFORE USE READ ALL INSTRUCTIONS BEFORE USE • Before replacing your oven light bulb, CHILD SAFETY switch off the electrical power to the oven at the main fuse or circuit breaker panel. WARNING Failure to do so can result in severe personal injury, death, or electrical shock.

  • Page 9: Safety When Cleaning

    GENERAL READ ALL INSTRUCTIONS BEFORE USE READ ALL INSTRUCTIONS BEFORE USE SAFETY WHEN CLEANING • Important Instruction. In the event the self • Do Not Clean Door Gasket. The door gasket is clean error code F is displayed, and error essential for a good seal.
  • Page 10 GENERAL MODEL & SERIAL NUMBER LABEL AND MODEL & SERIAL NUMBER LABEL AND TECH SHEET LOCA TION TECH SHEET LOCA TION The Model/Serial Number label and Tech Sheet locations are shown below. Model & Serial Number Location Tech Sheet Location...

  • Page 11: Specifications

    GENERAL SPECIFICA TIONS SPECIFICA TIONS Product Specification List Items Specifications Remarks Model name LWD3081ST Built-in Double wall oven North American market Rating power source 240V~60Hz Single phase & 4-wires Heat source Sheath heater & Carbon heater Max power 7.8 KW 120/208V : 5.9 KW...

  • Page 12: Using Your Oven

    USING YOUR OVEN GENERAL INFORMA TION GENERAL INFORMA TION Rating Label Cooking Guide Refer to the owners manual for recommendations Model numbers are recorded on the rating label. of times and temperatures. Times, rack position, Rating label is located on the lower left bottom and temperatures may vary depending on area of the controller.

  • Page 13: Control Panel Feature

    USING YOUR OVEN CONTROL P ANEL FEA TURES CONTROL P ANEL FEA TURES READ THE INSTRUCTIONS CAREFULLY BEFORE USING THE OVEN. For satisfactory use of your oven, become familiar with the various features and functions of the oven as described below. 1.

  • Page 14: Setting The Initial Control

    USING YOUR OVEN 1. SETTING THE INITIAL CONTROL 3) Hour and Min setting 1) LG logo display 8 seconds. - Initial display NUMERIC (Set the TIMER TIMER TIMER (Power Failure or Reset) desired time-hour and min) First, Select Language, and set clock time, and then the oven can be used.

  • Page 15: Bake

    USING YOUR OVEN 3) Display brightness 7) Clock Time 1. Requirement: LCD Display Brightness 1. Requirement: The clock key is used to set the adjustment clock in idle mode. The clock can be set to 12 2. Key Input Process or 24 hour format.

  • Page 16: Broil

    USING YOUR OVEN 9. BROIL 16. HEALTHIER ROAST Healthier Selected food Desired Broil Broil Roast category Full / Center Desired Desired Temp START START Temperature High / Med / Low 10. ROAST * Note: The meat probe must be used in this feature.

  • Page 17: Disassembly Instructions

    DISASSEMBLY INSTRUCTIONS This section instructs you on how to service each component inside the range. The components and their locations are shown below. COMPONENT LOCA TIONS COMPONENT LOCA TIONS Main PCB Display PCB Low Voltage Transformer Side Key PCB Upper Oven Light Upper Door Latch Assembly Oven Sensor...

  • Page 18: Disassembly Instructions(Upper)

    DISASSEMBLY INSTRUCTIONS(UPPER) REPLACING THE CONTROL P ANEL AND RELA TED COMPONENTS REPLACING THE CONTROL P ANEL AND RELA TED COMPONENTS 6. Disconnect the 8EA connector from PCB assembly WARNING (CN01, CN02, CN03, CN04, CN05, CN08, CN11, CN12) and separate control panel carefully. •...

  • Page 19: Door Locking Mechanism

    DISASSEMBLY INSTRUCTIONS(UPPER) 2) To remove the Relay PCB, Remove 1 screw clean until the temperature fall below 500°F/260°C. If there is a failure of this motor the following steps and slide relay PCB out. can be followed to unlock the door manually. Disconnect the 13EA connector from PCB assembly(CN01, CN02, CN03, CN04, BL, YL, Unlocking status...

  • Page 20: Disassembly Instructions(Upper/Lower)

    DISASSEMBLY INSTRUCTIONS(UPPER/LOWER) REPLACING OVEN CA VITY COMPONENTS REPLACING OVEN CA VITY COMPONENTS 1) To remove the broil element: WARNING a. Remove the 4 screws from the front and rear brackets. • ELECTRIC SHOCK HAZARD - Unit must be disconnected from electrical outlet when making repairs, replacements, adjustments.
  • Page 21 DISASSEMBLY INSTRUCTIONS(UPPER/LOWER) b. Remove the 4 convection element screws. 4) To remove the halogen lamp & socket assembly (The convection element is fragile. Care a. There are three halogen lamp & socket should be taken to avoid any risk of injury) assembly in the oven cavity.

  • Page 22: Replacing Other Electrical Components

    DISASSEMBLY INSTRUCTIONS(UPPER) REPLACING OTHER ELECTRICAL COMPONENTS REPLACING OTHER ELECTRICAL COMPONENTS Vent motor Thermal limiter WARNING • ELECTRIC SHOCK HAZARD - Unit must be disconnected from electrical outlet when making repairs, replacements, adjustments. Replace all panels before operating oven. Failure to do so can result in death or electrical shock.

  • Page 23: Cooling Fan (Blower)

    DISASSEMBLY INSTRUCTIONS(UPPER) COOLING FAN (BLOWER) 4) Squeeze tabs on switch and slide through the front. • Self Clean Mode: The cooling fans can Disconnect the wires from terminals. operate at 2 different speeds based on temperature. If the temp is above 482°F/250°C the fans will operate on high.
  • Page 24 DISASSEMBLY INSTRUCTIONS(UPPER) 1) To Remove Thermal Limiter (Double Line Brake 3) To remove the hidden bake element Upper), remove the screw and 2 wire leads. a. Remove the Vent cover, Barrier bracket. THERMAL LIMITER • To shut down the heaters The thermostats are located at the back of the oven next to each broil element and wired in series with each Double Line Break relay.
  • Page 25 DISASSEMBLY INSTRUCTIONS(UPPER) d. Bend the insulator up and remove the 1 screw. e. Carefully pull the hidden bake element and its BAKE HEATER_COVER out of the oven.\ f. When replacing the Bake Element cover use the 5 screws provided.

  • Page 26: Disassembly Instructions(Lower)

    DISASSEMBLY INSTRUCTIONS(LOWER) 7. To remove the Thermal limiter, Convection motor, 1) To Remove Thermal Limiter (Double Line Brake Lower), remove the screw and 2 wire leads. and Bake Element from the lower oven Follow the steps as follows. Remove Lower rear cover. THERMAL LIMITER •...
  • Page 27 DISASSEMBLY INSTRUCTIONS(LOWER) 4) To remove the hidden bake element Remove screws from middle support. a. Remove the barrier bracket. Barrier Middle support bracket Lower Door lock motor b. To remove the convection motor assembly. assembly (refer to the following page 3-8) Lower door switch Lower vent motor 8.

  • Page 28: Disassembly Instructions(Upper/Lower)

    DISASSEMBLY INSTRUCTIONS(UPPER/LOWER) REMOVING & REINST ALLING THE LIFT -OFF OVEN DOOR REMOVING & REINST ALLING THE LIFT -OFF OVEN DOOR To replace the door: CAUTION 1. Firmly grasp The door is very heavy. Be careful both sides of the door at the top. when removing and lifting the door.

  • Page 29: Removing The Oven Door Handle & Glass

    DISASSEMBLY INSTRUCTIONS(UPPER/LOWER) REMOVING THE OVEN DOOR HANDLE & GLASS REMOVING THE OVEN DOOR HANDLE & GLASS 6. To remove the door handle & trim. CAUTION a. Remove 2 screws for handle and replace. • Be careful when you work on the b.
  • Page 30 DISASSEMBLY INSTRUCTIONS(UPPER/LOWER) 5) Lift the COVER_INNER-2 off the door liner. 6) Lift the hinge out of the door liner slot. To remove the oven door glass assembly: 7) Lift the COVER_INNER-1 off the door liner. COVER_INNER-1 COVER_INNER-1 COVER_INNER-1 COVER_INNER-1 COVER_INNER-1 COVER_INNER-1 COVER_INNER-1 COVER_INNER-1...

  • Page 31: Removing The Oven Door Gasket

    DISASSEMBLY INSTRUCTIONS(UPPER/LOWER) REMOVING THE OVEN DOOR GASKET REMOVING THE OVEN DOOR GASKET 1. Remove oven door 3. Pull the ends of the gasket out of the liner holes. 2. Pull the oven door gasket clips out of the liner Liner Hole holes until all of the clips are removed.

  • Page 32: Component Test

    COMPONENT TEST Before testing any components, perform the following checks: NOTE: 1. The most common cause for control failure is corrosion on connectors. Therefore, disconnecting and reconnecting wires will be necessary throughout test procedures 2. If this is a new product check all connections before replacing parts. 1.

  • Page 33: Door Locking Motor

    Components Test procedures Results Normal: Approximately 2550 Ω Door locking Motor 1. Refer to page 3-10 for disassembly Replace if: Infinite (opened) 2. Measure the resistance below 5 Ω (shorted) (Multiple meter scale: R x 1000) Door latch Door latch Door locking micro 1.

  • Page 34: Oven Thermistor

    Components Test procedures Results Normal: Approximately Oven Thermistor 1. Refer to page 3-5 for disassembly 1090 Ω 2. Measure the resistance after cool down Replace if: Infinite (opened) (Multiple meter scale: R x 1000) below 10 Ω (shorted) NOTE: Ω Value should be tested at room temperature (77F/25˚C) NOTE: After checking for the continuity of switch, make sure to reconnect leads...

  • Page 35: Broil Element

    Components Test procedures Results Normal: Approximately Broil Element 1. Refer to page 3-4 for disassembly Inner: 22.5 Ω 2. Measure the resistance after cool down Outer: 36.9 Ω (Multiple meter scale : R x 1) Replace if: Infinite (opened) NOTE: Outer Broil element use Outer yellow and Blue terminals to check resistance.

  • Page 36: Diagnosis Through Schematic

    DIAGNOSIS THROUGH SCHEMATIC Apply schematic from Tech sheet. Symptom : Dead -. Check : Open/Short Symptom : Oven lamp not operating -. Check : Open/Short Symptom : No Heating (F-9, F-19) -. Check : Open/Short Symptom : Oven hot (F-6, F-16) -.

  • Page 37: How To Enter The Test Mode

    If you push START - TIMER - UP LIGHT - START button in order, you can enter the test mode. It’s possible to enter the test mode after power is on. And any keys should not be pushed, even though LG Logo is disappeared on the screen. ★...

  • Page 38: Safety Caution & Error Code Summary

    SAFETY CAUTION & ERROR CODE SUMMARY 1.1 Safety Caution • Normal State is power OFF, unless described differently as power ON. 1.2 Error Code Summary Code Description Operation Opened Sensor Upper Oven Thermistor remain open for over 1 min, after cook (Upper) starts Shorted Sensor...

  • Page 39: Checking Flow Chart By Failure Mode

    CHECKING FLOW CHART BY FAILURE MODE Dead Symptom Check Point 1. Dead 1. Check for power to wall oven 2. No Display 2. Check the thermostat. 3. Check the Transformer. 4. Check the System and Display...

  • Page 40: Dead

    CHECKING FLOW CHART BY FAILURE MODE Dead No display Power off Check for loose connector’s. or disconnect CN01, CN02, CN03 between system(CN10) and display(CN10) Fix the connection Connector is ok? Power On Check AC input voltage of oven System PCB - CN01 (pin 1 and 3) Should have 120VAC.
  • Page 41 CHECKING FLOW CHART BY FAILURE MODE Dead Power off Check the Thermostat (open/short) L1 and CN01’s RD color wire N and CN01’s WH color wire Is it 120V AC? If it have the error, it is open state. Is it short? Replace the thermostat.
  • Page 42 CHECKING FLOW CHART BY FAILURE MODE Dead Power On Check the System’s Vcc – CN10’s pin11(Vcc) and pin9 (GND) The voltage should be 4.5 VDC ~ 5.8 VDC. Replace the system PCB Is the voltage OK? Check the Display’s Vcc–CN10’s pin11(Vcc) and pin9 (GND) or C228 or C19 Don’t remove the harness The voltage should be 4.5 VDC ~ 5.8 VDC...
  • Page 43 CHECKING FLOW CHART BY FAILURE MODE Dead Replace the Display PCB Is the voltage OK? Check the System’s PCB Replace the Display PCB...

  • Page 44: Oven Does Not Heat (Including F-9, F-19 Error)

    CHECKING FLOW CHART BY FAILURE MODE Oven does not heat (including F-9, F-19 error) Symptom : No heating -. Check : Elements Resistance ohms Symptom : No heating -. Check : connection Symptom : No heating -. Check : Open/Short Symptom Check Point No heating...
  • Page 45 CHECKING FLOW CHART BY FAILURE MODE Oven does not heat (including F-9, F-19 error) No heating(including F-9/F-19 error) Disconnect power Check the electric wire connection DLB and and harness of Relay and each heater’s connection. And system PCB and Relay PCB(CN11, CN12) Loose connection and disconnection Fix the connection Is connection OK?
  • Page 46 CHECKING FLOW CHART BY FAILURE MODE Oven does not heat (including F-9, F-19 error) Measure the Resistor of each heater Between the DLB Relay’s L2 and each heater Relay’s Harness point of Figure 1 (①, ②, ③, ④ and ⑤) (measure the resistance after cooling down) Normal: Resistor...
  • Page 47 CHECKING FLOW CHART BY FAILURE MODE Oven does not heat (including F-9, F-19 error) Power On Check the thermistor using the test mode 4.Diagnosis Upper oven sensor, Lower oven sensor After value the sensor value are 70˚F ~ 90˚F(at 24˚C) Power Off Check the thermistor’s resistor CN04 pin3, 4 and CN05...

  • Page 48: Not Operating Key (Including F-3 Error)

    CHECKING FLOW CHART BY FAILURE MODE Not operating Key (including F-3 error) Key operating fail(F-3) Check the connection key pcb’s CN7 and between display pcb and key pcb(CN6) Fix the connection Is connection OK? Replace the control supporter(ITO film+Glass touch PCB) Is Key operating OK? Replace the Display pcb 5-13...

  • Page 49: Lock System Failure(Including F-10, F-20 Error)

    CHECKING FLOW CHART BY FAILURE MODE lock system failure(including F-10, F-20 error) Just after self-clean start,the door lock motor starts to rotate. During that time if the door lock switch does not operate properly after rotating twice, then supervising circuit detects a Door Lock failure and the F-10, F-20 error code appears.
  • Page 50 CHECKING FLOW CHART BY FAILURE MODE lock system failure(including F-10, F-20 error) Check the locking motor (measure the resistance) Normal : approximately 2.6 kΩ Abnormal : infinite or below 5 Ω Check the loose connector (Oven main PCB CN08) Replace the locking motor 1 2 3 Is the connection OK? Check the Relay PCB’s electric connection (CN01, CN03)

  • Page 51: Oven Thermistor Failed(Including F-1, F-2, F-4, F-5 Error)

    CHECKING FLOW CHART BY FAILURE MODE Oven Thermistor failed(including F-1, F-2, F-4, F-5 error) oven sensing failed (including sensor error) Check the thermistor using the test mode 4.Diagnosis Upper oven sensor, Lower oven sensor After value the sensor value are 70˚F~90˚F(at 24˚C) Power Off Check the thermistor’s resistor CN04 pin3, 4 and CN05...

  • Page 52: Oven Too Hot (Including F-6/F-16 Error)

    CHECKING FLOW CHART BY FAILURE MODE Oven too hot (including F-6/F-16 error) Oven is too hot(F-6/16 error) Disconnect power Remove the relay PCB harness and pull the relay PCB forward from case Check the L1(TAB1, 18/TAB6, 20) and all the heater relay welded or not. (AND measure the resistance) Welded Normal...

  • Page 53: Communication Error

    CHECKING FLOW CHART BY FAILURE MODE Communication error → → F-10 error F-10 error (communication error) Check the PCB’s test mode Check the 4.Diagnosis Communication check Ok or NG. Check the connection between the system and display(CN10) Fix the connection Is the connection OK? Check the test mode 1 power check...

  • Page 54: Schematic Diagram

    SCHEMATIC DIAGRAM...

  • Page 55: Strip Circuits

    STRIP CIRCUITS STRIP CIRCUITS Complete the following steps before checking electric oven circuit : 1.Check the line voltage, household fuse or circuit breaker. 2.Check for loose wiring or mis-wiring within electric range. NOTE: The following individual circuits are for use in diagnosis, and are shown in the ON position. NOTE: “(Up)”...
  • Page 56 Crisp Convection mode Conv. Bake & Conv. Roast mode Note: In case of Bake mode, the convection fan will operate only for preheating.
  • Page 57 Bake & Roast mode Self Clean mode • CIRCUIT SHOWN WITH ALL HEATERS SET TO “OFF”. • DOOR LOCK MOTOR AND BLOWER(LOW) SET TO “ON” • OVEN DOORS CLOSED AND UNLOCKED. NOTE: SELF CLEAN CAN ONLY BE RUN IN EITHER THE UPPER OR LOWER OVEN, SELF CLEAN CAN NOT BE SIMULTANEOUSLY IN THE UPPER AND LOWER OVENS.
  • Page 58 Warm & Proof mode...

  • Page 59: Exploded View

    #EV# EXPLODED VIEW INTRODUCTION CONTROLLER PARTS DOOR PARTS CAVITY PARTS -7-1-...

  • Page 60: Door Parts

    #EV# DOOR PARTS W257 1703 1000 W225 W144 1040 1121 1120 W256 W144 1401 W144 1030 W256 W225 1009 1402 1008 W256 W144 1703 1704 W144 -7-2-...

  • Page 61: Controller Parts

    #EV# CONTROLLER PARTS W108 2119 2006 2050 W105 2381 2038 W105 2009 2118 W258 -7-3-...
  • Page 62 #EV# UPPER CAVITY PARTS 5014 W144 5504 W235 5041 W144 5001 W146 W237 5070 W105 W236 W144 W241 5010 W144 5508 W144 5503 5717 5611 3006 3006 W144 5517 W144 5414 5506 W144 W144 5124 W144 5718 W144 W144 5073 W144 3062 W104...
  • Page 63 #EV# LOWER CAVITY PARTS W144 5702 W144 5124 5414 W144 5517 5073 5449 W144 5073 W144 5507 W144 W144 W144 3006 3062 5703 W144 W144 3006 5562 W144 5440 W104 5561 5550 5119 5713 5540 5602 5450 W144 5550 W231 3006 5513 W144...
  • Page 64 #EV# ASSEMBLY W144 W144 3029 W144 3605 3604 W144 W144 3601 W144 3603 3013 W144 5723 W144 3602 W144 2004 3311 W144 W144 1005 W144 5097 W144 W144 W144 W144 5535 W144 1005 W144 5545 3013 5527 W144 W144 3018 W121 3511 3044...

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