LG LRE3194ST Service Manual
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LG LRE3194ST Service Manual

LG LRE3194ST Service Manual

30” freestanding electric range
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30" Freestanding Electric Range
SERVICE MANUAL
MODEL: LRE3194ST
CAUTION
BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO : MFL37118393
LRE3194BD
LRE3194BM
1
Internal Use Only
June, 2018
Printed in Korea

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Summary of Contents for LG LRE3194ST

  • Page 1 Internal Use Only 30” Freestanding Electric Range SERVICE MANUAL MODEL: LRE3194ST LRE3194BD LRE3194BM CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. June, 2018 P/NO : MFL37118393 Printed in Korea...
  • 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, 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 (Page) GENERAL - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1-1 ~ 1-5 •...
  • Page 4 (Page) COMPONENT TEST - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 4-1 ~ 4-7 •...

  • 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 SELF-CLEAN OVENS • Do Not Leave Children Alone - Children should not be left alone or unattended in area where appliance is in use. They should never be • Do Not Clean Door Gasket – The door gasket is essential for a 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. Model & Serial Number Location Tech Sheet Location (On Rear Cover)

  • Page 9: Specifications

    GENERAL SPECIFICATIONS Model Number LRE3194ST / LRE3194BD / LRE3194BM Category Convection Overall Width 30" Installation type Freestanding Color availability Control Oven Keypad(Membrane) Cooktop Keypad(Membrane) Display Scroll VFD Electronic clock & timer Control lock capability Audible preheat signal Special function Option(6 categories) 1.

  • 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 Triple Right Front Triple element 1. BAKE PAD: Press to select the bake function. 12. COOK TIME PAD: Press and then use the number pads to set the amount of time you want 2. BROIL PAD: Press to select the broil function. your food to cook.

  • Page 12: To Turn On A Single Surface Unit (Right Rear, Left Rear)

    USING YOUR RANGE 3. TO TURN ON/OFF THE OVEN LIGHT To turn on a single surface unit (Right Rear, Left Rear) The oven light automatically turns ON when the door is opened. The oven light may also be 1. Press ON/OFF pad for the desired element. manually turned ON or OFF by pressing the 2.

  • Page 13: Bake, Timed Bake, Delayed Timed Bake

    USING YOUR RANGE 8. FAVORITES 3) LANGUAGE SELECTION (English or Spanish or French) FAVORITES START 1. Press SETTING pad 3 times : Once → Bread 2. Press “1” pad for ENGLISH : Twice → Meat or “2” pad for SPANISH : 3 times →...

  • Page 14: 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 Main PCB Cook Top Display PCB Door Locking Motor & Micro Switch Surface Elements Door Latch Assembly Door Switch Oven Light Oven Sensor...
  • Page 15 COMPONENT ACCESS REMOVING THE LAMP, CONTROLLER, BACK COVER AND CONTROLLER ASSEMBLY(MEMBRANE, PCB, SUPPORT) 6. Remove the 5 screws and wirings from Main WARNING PCB and Main PCB can be detached from the support assembly. • DISCONNECT power supply cord from the outlet before servicing. •...
  • Page 16 COMPONENT ACCESS 9. Remove a cooktop plate assembly (See the page 11. Remove 6 screws from the controller assembly. 3-6) and remove 4 screws from side panel. 12. For serving the KEY Membrane, the controller sub 10. Remove 4 screws from the controller assembly assembly should be separated in whole.
  • Page 17 COMPONENT ACCESS REMOVING PCBs (MAIN PCB AND RELAY PCB) 4. There are 2 PCBs. When you check PCB, check WARNING the proper PCB in default mode and check Main PCB. • DISCONNECT power supply cord NOTE: Refer to the page 5-1~5-6 for from the outlet before servicing.
  • Page 18 COMPONENT ACCESS REMOVING THE SURFACE ELEMENTS AND THE CERAMIC GLASS COOKTOP Step. 6 WARNING To remove the surface • DISCONNECT power supply cord elements from the outlet before servicing. a) Remove the wires from • Replace all panels and parts before the element and limiter operating.
  • Page 19 COMPONENT ACCESS REMOVING THE DOOR LATCH & DOOR SWITCH b) Remove the door latch from the front side of WARNING cavity and unhook the actuating rod. • DISCONNECT power supply cord An actuating from the outlet before servicing. • Replace all panels and parts before operating.
  • Page 20 COMPONENT ACCESS REMOVING THE BROIL ELEMENT * 2 screws of the rear bracket do not only fasten WARNING broil heater’s rear bracket but also a thermistor. While servicing broil elements, the thermistor also • DISCONNECT power supply cord should be disassembled. from the outlet before servicing.
  • Page 21 COMPONENT ACCESS REMOVING THE HIDDEN BAKE ELEMENT 1. Unplug range or disconnect power. 7. Carefully pull the hidden bake element out of the range. 2. Pull the range out of its mounting location so that you can access the rear of the unit. 3.
  • Page 22 COMPONENT ACCESS REMOVING THE CONVECTION, FAN BLADE AND FAN MOTOR 1. Disconnect power and remove oven racks. CAUTION 2. Pull the range out of its mounting location so that you can access the rear of the unit. • Be careful not to bend the fan blade 3.
  • Page 23 COMPONENT ACCESS REMOVING THE OVEN LIGHT & SOCKET ASSEMBLY CAUTION WARNING • DISCONNECT power supply cord • Be careful not to scratch or chip the from the outlet before servicing. oven liner paint when you remove • Replace all panels and parts before the oven light socket in the next operating.

  • Page 24: Micro Switch

    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 SENSOR 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 electrical shock.
  • Page 26 COMPONENT ACCESS REMOVING & REPLACING THE LIFT-OFF OVEN DOOR To replace the door: CAUTION Step. 1 • Be careful when removing and Firmly grasp both lifting the door. sides of the door • DO NOT lift the door by the handle. at the top.
  • Page 27 COMPONENT ACCESS REMOVING THE OVEN DOOR HANDLE 5. Lift the door cover assembly out and put it down. WARNING 6. To remove the door handle for stainless models. - Remove 4 screws from door bracket and the handle • DISCONNECT power supply cord can be detached from the door cover assembly.
  • Page 28 COMPONENT ACCESS REMOVING THE OVEN DOOR’S INNER GLASS 6. To remove a hinge hanger assembly: WARNING Remove 4 screws and detach the hinge hanger from the door frame slot. • DISCONNECT power supply cord from the outlet before servicing. • Replace all panels and parts before operating.
  • Page 29 COMPONENT ACCESS REMOVING 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 30 COMPONENT ACCESS REMOVING THE SIDE PANEL 7. Remove 6 screws from the side pandel 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 electrical shock.
  • Page 31 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 32: Oven Sensor

    Components Test procedures Results Normal: Approximately Door locking Motor 1. Refer to page 3-12 for the servicing procedure 2.6 kΩ ± 10% 2. Measure the resistance If not replace (Multiple meter scale: R x 1000) Abnormal: Infinite(open) below 5Ω (shorted) Micro Switch ON position (Unlock position) OFF position (Lock position)

  • Page 33: Door Switch

    Components Test procedures Results Door switch 1. Refer to page 3-7 for the servicing procedure Door open Door closed 2. Measure the resistance after cooling down (Multiple meter scale: R x 1) Continuity Infinite Oven lamp Normal: Below 5 Ω. 1.

  • Page 34: Single Surface Unit(Lr, Rr)

    Components Test procedures Results Single surface units: 1. Refer to page 3-6 for the servicing procedure Left Rear(LR) 2. Set the Multiple meter scale to the R x 1 Right Rear(RR) 3. Disconnect wires from cook-top elements Element 4. Touch the ohmmeter test leads to the element terminal and 1A.
  • Page 35 Components Test procedures Results Single surface units: 1. Refer to page 3-6 for the servicing procedure Right Front (RF) 2. Set the Multiple meter scale to the R x 1 3. Disconnect wires from cook-top elements 4. Touch the ohmmeter test leads to the element terminal and 1A.
  • Page 36 Components Test procedures Results Triple surface unit: 1. Refer to page 3-8 for the servicing procedure Right Front(RF) Element 2. Set the Multiple meter scale to the R x 1 3. Disconnect wires from cook-top elements 4. Touch the ohmmeter test leads to the (E1 & 1A) and (E2 &...

  • Page 37: Center Rear(Cr): Warming Zone

    Components Test procedures Results Center Rear(CR) 1. Refer to page 3-6 for the servicing procedure Element 2. Set the Multiple meter scale to the R x 1 : Warming Zone 3. Disconnect wires from CR elements (Plane Heater) 4. Touch the ohmmeter test leads to the between element terminal.

  • Page 38: Composition Of Control

    COMPOSITION OF CONTROL Wiring Diagram RADIANT COOK-TOP Wattage Ω approx.47Ω RR:1200W LR:1200W approx.47Ω LF: 1400W(Inner) approx.41Ω 1800W(Outer) approx.32Ω LF: 1100W(Single) approx.50Ω 2200W(Dual) approx.50Ω 3000W(Triple) approx.68.3Ω...

  • Page 39: Key Matrix

    COMPOSITION OF CONTROL Key Matrix...
  • Page 40 COMPOSITION OF CONTROL Main PCB (Loc No. : 2006) Front Oven Relay PCB (Loc No. : 5070) Back Cook top display PCB (Loc No. : 2031) Controller assembly Key Pad...

  • Page 41: Main Pcb

    COMPOSITION OF CONTROL Main PCB CN25 CN26 CN30 CN03 CN11 CN13 CN17 CN21 CN22 CN09 CN24 Oven Relay PCB CN103 CN102 CN17 CN16 CN100 CN101...

  • Page 42: Cook Top Display Pcb

    COMPOSITION OF CONTROL Cook top display PCB Key Pad...

  • Page 43: Check The Failure Code

    CHECK THE FAILURE CODE ■ When the oven has some failure on cooking, Cooking will be canceled automatic value and logs of F-come will be recorded in EEPROM. F-code will not display during normal operation. ■ Check the failure code as follow these steps. 1.

  • Page 44: Failure Code Summary

    FAILURE CODE SUMMARY Code Description How to detect Check point Sensor open Oven Thermistor is open 1. Wiring 2. Oven Sensor Sensor short Oven Thermistor is short 1. Wiring 2. Oven Sensor Button short 1. Wiring When some button is continuously short for >= 60 2.

  • Page 45: Basic Check Summary

    BASIC CHECK SUMMARY Symptom : Sensor error or no heating (F1,F2,F9) -. Check : Sensor resistance Symptom : Door lock fail (F-10) -. Check : relative part Symptom : Oven hot(F6) -. Check: : All heater relays are open/short Symptom : no heating(F9) -.

  • Page 46: Checking Flow Chart By Failure

    CHECKING FLOW CHART BY FAILURE Symptom Check Point 1. Power Failure 1. Check Electric Wiring (Dead) 2. Check the Main PCB Input Voltage with CN01 2. No Display...

  • Page 47: Power Failed(Dead), No Display

    CHECKING FLOW CHART BY FAILURE Power Failed (Dead), Unplugged the unit No display? Reconnect Is the connector connected to Plug the unit or repair the Main PCB disconnected or connector Check the button beep. disassembled? (CN1) Touch the Clear button, Change the Can hear the beep Main PCB...
  • Page 48 CHECKING FLOW CHART BY FAILURE Replace the Is the electric wiring normal? defective Measure the resistance Power harness cord and CN01’s connection Normal : continuity Normal Abnormal Abnormal: infinite - Code L1 to Pin1 of CN01(RD) - Code N to Pin3 of CN01(WH) RD color is L1.

  • Page 49: No Heating, F9

    CHECKING FLOW CHART BY FAILURE Symptom Check Point 1. No heating 1. Check Electric Wiring 2. F9 2. Check Heater’s Resistance. 3. Check the Sensor. Heater Resistance CHECK Main PCB Sensor Resistance CHECK...
  • Page 50 CHECKING FLOW CHART BY FAILURE Oven does not heat, F9 Is the heater normal? Replace the Unplugged the unit Failed heater Measure the resistance of each heater. Reconnect or (The resistance is shown Is the disconnect or loose repair the below) connector? connector...
  • Page 51 CHECKING FLOW CHART BY FAILURE Unplugged the unit Range Of the resistance Replace the Is the resistance of failed Heater Resistance[ Ω thermistor normal? thermistor Approximately Check: Broil 13.7 Bake 16.5 Pins 1and 2 of CN13 wiring in main PCB Normal- approximately 1.09kΩ...

  • Page 52: Cook Top No Heating

    CHECKING FLOW CHART BY FAILURE Symptom Check Point 1. Cook top 1. Check Electric Wiring No heating 2. Check the Resistance of each Heater...
  • Page 53 CHECKING FLOW CHART BY FAILURE Oven does not heat Replace the Measure the resistance defected Unplugged the unit of each heater. heater (The resistance is shown below) Reconnect or Is the Connector adjust the disconnected loose? connection 1. Electric wiring of Right rear Main PCB All taps.
  • Page 54 CHECKING FLOW CHART BY FAILURE Left Front Outer Range Of the resistance Heater Resistance[ Ω Approximately Center Rear Center Rear LF: 1400W(Inner) 1800W(Outer) RF: 1100W(Single) 2200W(Dual) 3000W(Triple) 68.3 Center Rear Left Front Inner Replace the Main PCB Right Front Outer...
  • Page 55 CHECKING FLOW CHART BY FAILURE Symptom Check Point 1. Door Lock System 1. Check the Electric wiring Failure 2. Check the Motor’s Resistance 2. F10 3. Check the Relay PCB (Door Lock Relay) Door lock Relay Door lock switch signal Door switch signal 9-10...

  • Page 56: Door Lock System Failure,F10

    CHECKING FLOW CHART BY FAILURE Unplugged the unit Door Lock System Failure,F10? Reconnect Plug the unit Is the disconnect or loose or adjust the connector? Note : connection Just after self-clean start, the door lock motor 1. Between Main PCB and starts to rotate.
  • Page 57 CHECKING FLOW CHART BY FAILURE Is the door lock switch Replace the (micro switch) normal? micro switch measure the resistance of door lock switch T normally open type Normal Abnormal Is the resistance of the locking Replace the motor normal ? locking motor measure the resistance of locking motor...

  • Page 58: Sensing Fail, F1, F2

    CHECKING FLOW CHART BY FAILURE 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 9-13...
  • Page 59 CHECKING FLOW CHART BY FAILURE Plug the unit Sensing Fail, F1, F2? Is the value of thermistor Go to No 1 normal? Unplugged the unit Check with the test mode To enter the test mode, follow these steps: Is the Connector Reconnect 1.
  • Page 60 CHECKING FLOW CHART BY FAILURE Symptom Check Point 1. Oven hot 1. Check the Resistance of the Relay. 2. F6 Relay Short check 9-15...

  • Page 61: Oven Hot, F6

    CHECKING FLOW CHART BY FAILURE Oven hot, F6? Bake(RY104) Relay Resistance Unplugged the unit Replace the Is the resistance of failed thermistor normal? thermistor CN101 1 st pin and 2 nd pin Check: Pins 1 and 2 of CN13 wiring in main PCB Normal- approximately 1.09kΩ...
  • Page 62 CHECKING FLOW CHART BY FAILURE Plug the unit Is the value of thermistor Replace the normal? (Refer below) Main PCB Check with the test mode To enter the testmode, follow these steps: 1. press the “clear” button 2. press the “BAKE”, “BROIL” button at the same time 3.

  • Page 63: Keypad Failure, F3 Error

    CHECKING FLOW CHART BY FAILURE Symptom Check Point 1. Keypad Failure 1. Check the Door Locking System. 2. F3 Error 2. Check the Electric Wiring. 9-18...
  • Page 64 CHECKING FLOW CHART BY FAILURE Plug the unit F3 error (Button short error) Or button does not input Replaced the Key pad. And then check button Unplugged the unit operation using key test mode Reconnect To enter the test mode, follow these steps: Check the connecting states or adjust the 1.

  • Page 65: Appendix

    APPENDIX Key operation Test ※ How to check button operation 1. Keys should be accessed according to the above sequence and check the beep sound when key is accessed 2. If change the key access order, the buzzer make double beep sound 3.

  • Page 66: Trouble Shooting

    TROUBLE SHOOTING PROBLEMS POSSIBLE CAUSES & FAULTS SOLUTIONS Oven not operating. • Bad main PCB • Test and/or replace PCB ➞ Refer to the page 9-1~9-3 • Power outage • Verify power is present at unit. • Verify that the circuit breaker is not tripped •...
  • Page 67 TROUBLE SHOOTING PROBLEMS POSSIBLE CAUSES & FAULTS SOLUTIONS Electronic timer will not • Failed main PCB • Replace main PCB accept Programming. Electronic timer will not • Failed main PCB • Replace main PCB accept Programming. Clock and timer not working •...
  • Page 68 TROUBLE SHOOTING PROBLEMS POSSIBLE CAUSES & FAULTS SOLUTIONS Oven door sagging on one • Hinge loose or out of position to • Adjust hinges or replace hinges side oven liner Door does not close • Broken or misadjusted door spring •...

  • Page 69: Schematic Diagram

    SCHEMATIC DIAGRAM NOTE:Schematic diagram shows door WARNING switch In the cook position with the oven POWER MUST BE door open and elements off. DISCONNECTED BEFORE SERVICING THE APPLIANCE 12-1...

  • Page 70: 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. OVEN LIGHT CLOCK DISPLAY ON BROIL...
  • Page 71 BAKE / COOK & WARM / PROOF CONV. BAKE / CONV. ROAST SELF CLEANING CR (Warming Zone) 12-3...
  • Page 72 RR Cook-top Element LR Cook-top Element RF Cook-top Element LF Cook-top Element 12-4...

  • Page 73: Exploded View

    #EV# EXPLODED VIEW INTRODUCTION MODEL: Customer Model Product Code SVC Model CONTROLLER PARTS MODEL: Customer Model Product Code SVC Model COOKTOP PARTS MODEL: Customer Model Product Code SVC Model MODEL: Customer Model Product Code SVC Model DOOR PARTS MODEL: Customer Model Product Code SVC Model CAVITY PARTS DRAWER PARTS...
  • Page 74 #EV# DOOR PARTS 1023 1801 W222 1000 W225 1733 1024 1703 1020 1028 1021 W222 1045 W222 W222 W225 W101 1009 1703 W101 1734 1735 1024 1704 1026...
  • Page 75 #EV# CONTROLLER PARTS 2048 2042 2041 2050 2006 2031 2381 2037 2036 3006 2034 2075...
  • Page 76 #EV# COOKTOP PARTS 3014 3056 3401 3401 3057 3303 3204 3022 3303 3302 3204 3204 3301 3204...
  • Page 77 #EV# DRAWER PARTS 8388 8513 8514 8501 8513 8507 W228 8517 8524 8504 5505 8602 8512 851D 8520 5505 851D 8502 8508...
  • Page 78 #EV# CAVITY PARTS 3013 5410 5517 5012 5539 5503 5019 3063 W234 5037 5501 3031 5700 5511 5509 5067 3093 5016 5502 5021 5063 W301 5505 5513 5516 W230 5070 5505 3109 W301 5512 5506 W225 W233 W301 5409 5521 5951 W232 W301...

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