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LG LRE4213ST Service Manual

Freestanding electric range
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Internal Use Only
30" Freestanding Electric Range
SERVICE MANUAL
MODEL: LRE4213ST
CAUTION
BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
Nov, 2015
Printed in Korea
P/NO : MFL37118345

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Summary of Contents for LG LRE4213ST

  • Page 1 Internal Use Only 30” Freestanding Electric Range SERVICE MANUAL MODEL: LRE4213ST CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. Nov, 2015 Printed in Korea P/NO : MFL37118345...
  • Page 2 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 done, 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 3: Table Of Contents

    TABLE OF CONTENTS GENERAL - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1-1 ~ 1-5 •...
  • Page 4 (Page) COMPONENT TEST - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 4-1 ~ 4-10 •...

  • Page 5: General

    GENERAL IMPORTANT SAFETY INSTRUCTIONS 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 6 GENERAL IMPORTANT SAFETY INSTRUCTIONS • Be sure your appliance is properly installed and grounded by a WARNING qualified technician. • Do not repair or replace any part of the appliance unless • DO NOT touch heating elements or specifically recommended in the manual. interior surfaces of oven.
  • Page 7 GENERAL IMPORTANT SAFETY INSTRUCTIONS • Do Not Leave Children Alone - Children should not be left alone SELF-CLEAN OVENS or unattended in area where appliance is in use. They should • Do Not Clean Door Gasket – The door gasket is essential for never be allowed to sit or stand on any part of the appliance.

  • Page 8: Model & Serial Number Label And Tech Sheet Locations

    GENERAL MODEL & SERIAL NUMBER LABEL AND TECH SHEET LOCATIONS The Model/Serial Number label and Tech Sheet locations are shown below. Tech Sheet Location (On Lower Rear Cover) Model & Serial Number Location...

  • Page 9: Specifications

    GENERAL SPECIFICATIONS Model Number LRE4213ST Category Single oven range Overall Width ⁄ Installation type Freestanding Color availability Control Oven Glass Touch Cooktop Knob Display Electronic clock & timer Control lock capability Audible preheat signal Special function Setting (6 categories) 1. Change hour mode on Clock 2.

  • Page 10: Using Your Range

    USING YOUR RANGE GENERAL INFORMATION Convection Bake / Roast Mode Rating Label Upper element, lower element, Rear element(some Model numbers are recorded on the rating label. model) and fan operate during convection bake. Rating label is located on the lower front left corner Convection bake should be used for cooking of the oven frame.

  • Page 11: Control Panel Features

    USING YOUR RANGE CONTROL PANEL FEATURES ❶ ❷ ❸ ❷ ❹ ❺ ❽ ❼ ❻ ❾ ❶ Oven Control ❺ NFC Tag On ❻ Smart Diagnosis TM: ❷ Features ❸ Number Keys ❼ Clear Off / Lockout Key ❹ Start Key ❽...

  • Page 12: Setting The Clock

    USING YOUR RANGE 1. SETTING THE CLOCK 2) CONVECTION AUTO CONVERSION 1. Touch START pad to start oven. 1. Touch Settings repeatedly until Auto 2. Touch UPPER or LOWER CLEAR OFF pad appears in the display. to cancel a program during cooking or 2.

  • Page 13: Self Clean

    USING YOUR RANGE 5. BAKE, TIMED BAKE, DELAYED TIMED BAKE Desired BAKE START temperature COOK Desired time START TIME START Desired START TIME start time * This feature can also be used with the: CONVECTION BAKE and CONVECTION ROAST modes. 6.
  • Page 14 USING YOUR RANGE To turn on the Dual element: Use to turn on the surface elements. An infinite choice of heat settings is available from LOW to There is one dual element located in the left front HIGH The knobs can be set on or between any of position.
  • Page 15 USING YOUR RANGE To turn on a Triple element (on some To turn on the Warming Zone: models): CAUTION There is one triple element that can be used as either a single, dual or triple element. FOOD POISON HAZARD: Bacteria 1.

  • Page 16: Component Access

    COMPONENT ACCESS This section instructs you on how to service each component inside the range. The components and their locations are shown below. COMPONENT LOCATIONS Relay PCB Main PCB NFC PCB Cooktop PCB Surface Elements Buzzer PCB Door Locking Motor &...
  • Page 17 COMPONENT ACCESS REMOVING CONTROL COVER AND TOUCH GLASS ASSEMBLY 5. Unplug 1 connector from Touch PCB. WARNING • DISCONNECT power supply cord from the outlet before servicing. • Replace all panels and parts before operating. • RECONNECT all grounding devices. - Failure to do so can result in severe personal injury, death or electric shock.
  • Page 18 COMPONENT ACCESS REMOVING THE POWER CONTROL BOARD (PCB) 4. There are 4 PCB’s(except touch PCB). When you WARNING check PCB, check the proper PCB in default mode and check Main PCB. • DISCONNECT power supply cord NOTE: Refer to pages 5-1~5-3 for composition of from the outlet before servicing.
  • Page 19 COMPONENT ACCESS REMOVING THE SURFACE ELEMENTS AND THE CERAMIC GLASS COOKTOP Step. 6 WARNING Protect the cooktop • DISCONNECT power supply cord surface and turn the from the outlet before servicing. assembly over. • Replace all panels and parts before operating.

  • Page 20: Door Switch

    COMPONENT ACCESS REMOVIING THE DOOR LATCH & DOOR SWIITCH 5. To remove the door latch: WARNING a) Remove the two screws from the door latch and remove the latch. • DISCONNECT power supply cord b) Remove the door latch. from the outlet before servicing. •...
  • Page 21 COMPONENT ACCESS REMOVING THE BROIL ELEMENT b) Remove the 4 screws from the front and rear WARNING brackets. • DISCONNECT power supply cord 4 Screws from the outlet before servicing. • Replace all panels and parts before operating. • RECONNECT all grounding devices. - Failure to do so can result in severe personal injury, death or electric shock.
  • Page 22 COMPONENT ACCESS REMOVING THE CONVECTION ELEMENT, FAN BLADE AND FAN MOTOR 8. To remove Fan blade, remove nut by screwing 1. Disconnect power and remove oven racks. 2. Pull the range out of its mounting location so that clockwise. fan blade can be replaced from inside you can access the rear of the unit.
  • Page 23 COMPONENT ACCESS REMOVING THE OVEN LIGHT & SOCKET ASSEMBLY WARNING CAUTION • DISCONNECT power supply cord • Be careful not to scratch or chip from the outlet before servicing. the oven liner paint when you • Replace all panels and parts before remove the oven light socket in operating.
  • Page 24 COMPONENT ACCESS REMOVING THE LATCH DRIVE ASSEMBLY DOOR LOCKING MECHANISM WARNING The door lock assembly is located at the back side • DISCONNECT power supply cord of range. from the outlet before servicing. The structural elements are as below. • Replace all panels and parts before 1.
  • Page 25 COMPONENT ACCESS REMOVING THE OVEN TEMPERATURE SENSORS 5. To remove an oven temperature sensor, WARNING zdisconnect the connector from the main harness and remove the mounting screw in oven cavity. • DISCONNECT power supply cord Main Oven Sensor from the outlet before servicing. •...
  • Page 26 COMPONENT ACCESS REMOVIING & REPLACIING THE LIIT-OFF OVEN DOOR AND DRAWER Replacing the Door CAUTION 1. Firmly grasp both sides of the door at the top. • Be careful when removing and 2. With the door at the same angle as the removal lifting the door.
  • Page 27 COMPONENT ACCESS REMOVIING & REPLACIING THE LIIT-OFF OVEN DOOR AND DRAWER Replacing the Door CAUTION 1. Pull the bearing glides to the front of the chassis • Disconnect the electrical power to glide. the range at the main fuse or circuit 2.
  • Page 28 COMPONENT ACCESS REMOVIING THE OVEN DOOR HANDLE & GLASS 6. To remove the door handle & air guide WARNING a) Remove 2 screws from air guide and then remove the air guide by lifting that. • DISCONNECT power supply cord 2 screws from the outlet before servicing.
  • Page 29 COMPONENT ACCESS 7. To remove a hinge hanger assembly: a) Follow the step 3~4 on page 3-16. b) Place the frame assembly on a padded work surface. c) Remove 4screws from door frame middle. Outer glass Outer glass Outer glass Outer glass Outer glass Outer glass...
  • Page 30 COMPONENT ACCESS REMOVIING THE OVEN DOOR GASKET 3. Pull the ends of the gasket out of the liner holes. WARNING Liner Hole • DISCONNECT power supply cord from the outlet before servicing. • Replace all panels and parts before operating. •...
  • Page 31 COMPONENT ACCESS REMOVING A SIDE PANEL 7. Remove the 4 screws from the left or right side WARNING panel. • DISCONNECT power supply cord from the outlet before servicing. • Replace all panels and parts before operating. • RECONNECT all grounding devices. - Failure to do so can result in severe personal injury, death or electric shock.
  • Page 32 COMPONENT TEST Before testing any of 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. ALL units in the first few days of use should be checked for mis-wiring or loose connections. 1.
  • Page 33 Components Test procedures Results 1. Refer to page 3-14 for the servicing procedure Normal: Approximately Door locking Motor 2.6 kΩ ± 10% 2. Measure the resistance If not replace (Multiple meter scale: R x 1000) Abnormal: Infinite(open) below 5Ω (shorted) Door latch Door latch Micro Switch...

  • Page 34: Outer Broil Heater

    Components Test procedures Results Door switch 1. Refer to page 3-9 for the servicing procedure Door open Door closed 2. Measure the resistance after cooling down (Multiple meter scale: R x 1000) Continuity Infinite Outer Broil heater 1. Refer to page 3-10 for the servicing procedure Normal: Approximately 23 Ω...

  • Page 35: Infinite Switch (Single Units)

    Components Test procedures Results Infinite switch 1. Refer to page 3-6 for the servicing procedure. (Single units): 2. Set the Multiple meter scale to the R x 1000. LR switch 3. Disconnect all wires from infinite switch. RR switch 4. When turn on/turn off the knob, position measure CR switch the resistance between P1 to 2.

  • Page 36: Infinite Switch (Double Units)

    Components Test procedures Results Infinite switch 1. Refer to page 3-6 for the servicing procedure. (Double units): 2. Set the Multiple meter scale to the R x 1000. LF switch 3. Disconnect all wires from infinite switch. 4. Push in and turn left knob to check the single type. 5.
  • Page 37 Components Test procedures Results Infinite switch 8. After check the single type, check the dual type (Double units): at the same procedure. LF switch Infinite Switch Knob Position Results Dual type P1 - 2 Infinite (open circuit) P2 - 4 Infinite(open circuit) P2 - 4a Infinite (open circuit)

  • Page 38: Single Surface Units

    Components Test procedures Results Single surface units: 1. Refer to page 3-4 for the servicing procedure Left Rear (LR) 2. Set the Multiple meter scale to the R x 1 3. Disconnect wires from cook-top elements Right Rear(RR) 4. Touch the ohmmeter test leads to the element Element terminal and 1A.

  • Page 39: Center Rear(Cr) Element

    Components Test procedures Results Center Rear(CR) 1. Refer to page 3-7 for the servicing procedure Element 2. Set the Multiple meter scale to the R x 1 : Warming Zone 3. Disconnect wires from cook-top elements (Plane Heater) 4. Touch the ohmmeter test leads to the element terminal E1 and E2.

  • Page 40: Dual Surface Unit

    Components Test procedures Results Dual surface unit: 1. Refer to page 3-7 for the servicing procedure Left Front(LF) 2. Set the Multiple meter scale to the R x1 Element 3. Disconnect wires from cook-top elements 4. Touch the ohmmeter test leads to the (E1 & 1A) and (E2 &...

  • Page 41: Triple Surface Unit

    Components Test procedures Results Triple surface unit : 1. Refer to page 3-7 for the servicing procedure Right Front (RF) 2. Set the Multiple meter scale to the R x1 Element 3. Disconnect wires from cook-top elements 4. Touch the ohmmeter test leads to the (E1 & 1A) and (E2 &...

  • Page 42: Composition Of Control

    COMPOSITION OF CONTROL Wiring Diagram Main system PCB Relay PCB...
  • Page 43 Main PCB ( P/N : EBR80595305) Oven Relay PCB ( P/N : EBR80595403) Touch PCB ( P/N : EBR80089901) NFC PCB ( P/N : EBR78789101) Buzzer PCB ( P/N : EBR76332902)

  • Page 44: Composition Of Control

    COMPOSITION OF CONTROL Main PCB (P/N : EBR80595305) CN20 CN50 CN22 CN53 CN51 CN40 CN60 CN01 Relay PCB (P/N : EBR80595403) CN52 CN51 CN53...

  • Page 45: Touch Pcb

    COMPOSITION OF CONTROL Touch PCB (P/N : EBR80089901) NFC and Buzzer PCB (P/N : EBR78789101) (P/N : EBR76332902)

  • Page 46: Service Test Mode

    SERVICE TEST MODE SEQUENCE OF SVC TEST MODE To enter the test mode, follow these steps: (1) press the Clear button (2) press the BAKE and BROIL buttons at the same time (3) press the BAKE and BROIL buttons at the same time again. Model Option Software version (4) press the NUM 0 button...
  • Page 47 SERVICE TEST MODE ●Active Load Icon ●SW Version Current inspecting Relay’s information is displayed (6) Whenever you input the START button, the relay operation sequence should be as seen below. ※ Relay Operation Sequence RY 11 RY 12 RY 19 RY 5 RY 4 C/Fan...

  • Page 48: Basic Check Summary

    SERVICE TEST MODE BASIC CHECK SUMMARY Symptom : Oven hot(F6) -. Check: All heater relays are Symptom : Sensor error or open/shorted no heating(F1,F2) -. Check : Sensor resistance Symptom : no heating(F9) -. Check : All heater relays and DLB relay are open Symptom : Door lock fail (F10)

  • Page 49: Troubleshooting

    TROUBLESHOOTING CHECK THE FAILURE CODE ■ When the oven has a malfunction while cooking, Cooking will be canceled and log data of F-code will be recorded in EEPROM. F-code will not display during normal operation. ■ Check the failure code following these steps. 1.

  • Page 50: Failure Code Summary

    TROUBLESHOOTING FAILURE CODE SUMMARY Code Description explanation Check point 1.Wiring Sensor open Oven Thermistor is open 2.Oven Sensor Sensor short 1.Wiring Oven Thermistor is shorted. 2.Oven Sensor 1. If ‘25 key short’ occurred 3 times in 90 seconds. 1.Wiring Key short 2.

  • Page 51: No Display (No Power)

    TROUBLESHOOTING Troubleshooting Symptom Check Point 1. Power Failure 1.Check Electrical Wiring (Dead) 2.Check the Main PCB Input Voltage with CN1 2.No Display CN01 Thermostat CN01 Main PCB...
  • Page 52 TROUBLESHOOTING Power Failed (Dead), No display? Plug in the unit Check the AC input of Main Reconnect. If PCB. defective harness, Check the button beep. - Main PCB CN01 replace or fix Replace the Touch the Clear button, (Pin 1 and 3) Main PCB Can hear the beep sound? 120V AC?
  • Page 53 TROUBLESHOOTING Symptom Check Point 1. No heating 1.Check Electrical Wiring 2. F9 2.Check Heater’s Resistance. 3.Check the Sensor. Ⓐ Ⓔ Ⓒ Ⓓ RY13 RY12 Broil Ⓑ Heater Ⓕ RY11 Conv. Heater...
  • Page 54 TROUBLESHOOTING Symptom Check Point 1. No heating 1.Check Electrical Wiring 2. F9 2.Check Heater’s Resistance. 3.Check the Sensor. CN60...

  • Page 55: Oven Does Not Heat

    TROUBLESHOOTING Oven does NOT heat, F9 Check the resistance of each Replace the Unplug the unit heater. Normal? Failed heater (Measure the resistance after Reconnect. cooling down. The resistance is Is the Connector disconnected If defective harness, shown below) or loose? Replace or fix (1) Electric wiring of Relay PCB All taps.
  • Page 56 TROUBLESHOOTING Range Of resistance Unplug the unit Resistance[Ω] Heater Approximately Replace the Is the resistance of defective Broil Heater 13.5 thermistor normal? Thermistor Conv. Heater Check: Pins 4 and 5 of CN60 in main PCB Normal- approximately 1.09kΩ at 25℃ Plug in the unit CN60 Is the value of thermistor...

  • Page 57: Door Lock System Error

    TROUBLESHOOTING Symptom Check Point 1. Door Lock System 1. Check the Electrical wiring Failure 2. Check the Motor’s Resistance 2. F10 3. Check the Relay PCB (Door Lock Relay) CN60...
  • Page 58 TROUBLESHOOTING Symptom Check Point 1. Door Lock System 1. Check the Electrical wiring Failure 2. Check the Motor’s Resistance 2. F10 3. Check the Relay PCB (Door Lock Relay) 7-10...
  • Page 59 TROUBLESHOOTING Door Lock System Failure,F10? Plug in the unit Unplug the unit Note : Is the Connector disconnected Reconnect. Just after self-clean start, the door lock motor or loose? If defective harness, starts to rotate. Check the following: replace or fix During this time if the door lock switch does NOT (1) Electric wiring of relay in operate properly after rotating twice,...
  • Page 60 TROUBLESHOOTING Is the door lock switch (micro Replace the micro switch) normal? switch measure the resistance of door lock switch normally  open type Abnormal Normal Is the resistance of the lock Replace the lock motor normal ? motor measure the resistance of lock motor Normal : approximately 2.6kΩ...
  • Page 61 TROUBLESHOOTING Symptom Check Point 1. Sensing Fail 1.Check the Electric Wiring 2. F1 2.Check the Test Mode 3. F2 3.Check the Sensor’s Resistance CN60 7-13...
  • Page 62 TROUBLESHOOTING Sensing Fail, F1, F2? Is the resistance of Replace the thermistor normal? defective Thermistor Check: Unplug the unit Pins 4 and 5 of CN60 in main PCB Reconnect or adjust Normal- approximately 1.09kΩ at 25ºC Is the Connector disconnected the connection or loose? (1) Sensor connection...
  • Page 63 TROUBLESHOOTING Is the value of thermistor Go to No 1 normal? (Refer below) Check with the test mode To enter the test mode, follow these steps: (1) press the CLEAR button (2) press the BAKE and BROIL buttons at the same time (3) press the BAKE and BROIL buttons at the same time again.

  • Page 64: Oven Hot Error

    TROUBLESHOOTING Symptom Check Point 1. Oven hot 1.Check the Resistance of the Relay. 2. F6 2.Check the Sensor’s Resistance Ⓐ Ⓔ Ⓒ Ⓓ RY13 RY12 Broil Ⓑ Heater Ⓕ RY11 Conv. Heater 7-16...
  • Page 65 TROUBLESHOOTING Symptom Check Point 1. Oven hot 1.Check the Resistance of the Relay. 2. F6 2.Check the Sensor’s Resistance CN60 7-17...
  • Page 66 TROUBLESHOOTING Oven hot, F6, F16? Is the Heater relay normal? Replace the Relay PCB Measure the resistance of heater relay and Live. Unplug the unit Normal: infinite Abnormal : shorted Replace the Is the resistance of defective thermistor normal? Thermistor Check: Pins 4 and 5 of CN60 in main Broil Heater...
  • Page 67 TROUBLESHOOTING Is the DLB relay normal? Is the value of thermistor Replace the Relay Replace the Main Measure the resistance normal? (Refer below) Check with the test mode Normal: infinite To enter the test mode, follow Abnormal : shorted these steps: (1) press the CLEAR button (2) press the BAKE and BROIL buttons at the same time...

  • Page 68: Key Not Work

    TROUBLESHOOTING Symptom Check Point 1. Key not working 1. Check the Door Locking System. 2. F3 Error 2. Check the Electric Wiring. 7-20...
  • Page 69 TROUBLESHOOTING F3 error (Button short error) Plug in the unit Or button does not input Replace the Control panel. (With Glass Touch PCB) Unplug the unit And then check button operation using key test mode Reconnect or adjust the Check the connecting states connection between Touch PCB and (1) press the CLEAR button...

  • Page 70: Key Operation Test Sequence

    TROUBLESHOOTING KEY OPERATION TEST SEQUENCE ■ How to check button operation 1. Keys should be accessed according to the above sequence and check the beep sound when key is accessed If Key is the normal operation will be the number that corresponds to the Key displayed on the VFD 2.

  • Page 71: Schematic Diagram

    SCHEMATIC DIAGRAM RADIANT COOK-TOP NOTE: WARNING Wattage Schematic diagram shows RR : 1200 W approx. 47 POWER MUST BE DISCONNECTED BEFORE oven door opened and unlocked.All elements are SERVICING THE APPLIANCE. FAILURE TO DO SO LR : 1200 W approx. 47 set to “OFF”.

  • Page 72: 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. CR (COOKTOP ELEMENT) LR &...
  • Page 73 LF (COOKTOP ELEMENT) RF (Cooktop element)

  • Page 74: Exploded View

    #EV# EXPLODED VIEW INTRODUCTION MODEL: Customer Model Product Code SVC Model COOKTOP CONTROLL PARTS 8511 9501 9504 9506 W229...
  • Page 75 #EV# DOOR PARTS 102S 102U W243 1000 102L 173U W222 1008 1704 1020 1015 1035 1021 W101 1009 173U W101 1735 1704 1035...
  • Page 76 #EV# CONTROLLER PARTS 2048 2051 2050 2030 260K 260M 2001 2006 260B 2034 2042 203L 2043 203R 2044 2045...
  • Page 77 #EV# COOKTOP CONTROLL PARTS 244D 244S W293 W167 W293 2026 244D W293 W293 2052 2002 W293 2082 2084 303L 2084 2085 2118 2041 303R...
  • Page 78 #EV# COOKTOP PARTS 3056 3402 3099 3059 330S 3016 3022 301C 330S 330M 3204 330H 3006...
  • Page 79 #EV# DRAWER PARTS 8514 8501 8513 8523 8507 W230 8517 1009 8504 8524 5505 8602 8512 5505 6008 851D 8508 8508 851D 8508...
  • Page 80 #EV# CAVITY PARTS 5331 3501 5517 3057 5510 5501 5063 5504 546L 5032 W140 546R 5039 5508 5535 5408 5502 W129 5511 5405 5006 4002 5016 3208 W102 5535 W124 5407 W233 W291 5521 3057 W301 5518 5516 5510 5509 5406 5021 5512...

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