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삼 흥 정 판 30” Freestanding Electric Range SERVICE MANUAL MODEL: LDE3031ST CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. February, 2013 P/NO : MFL37118325 Printed in Korea...
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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.
GENERAL IMPOR ANT SAFETY INSTRUCTIONS IMPOR ANT 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.
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GENERAL IMPOR ANT SAFETY INSTRUCTIONS IMPOR ANT 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.
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GENERAL IMPOR ANT SAFETY INSTRUCTIONS IMPOR ANT SAFETY INSTRUCTIONS • Do Not Leave Children Alone - Children should not be left alone or SELF-CLEAN OVENS 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.
GENERAL MODEL & SERIAL NUMBER LABEL MODEL & SERIAL NUMBER LABEL AND TECH SHEET LOCA TIONS AND TECH SHEET LOCA TIONS The Model/Serial Number label and Tech Sheet locations are shown below. Model & Serial Number Location Tech Sheet Location (On Low Rear Cover)
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GENERAL SPECIFICA TIONS SPECIFICA TIONS Model Number LDE3031ST Category Double oven range Overall Width 30" Installation type Freestanding Color availability Control Oven Keypad(Membrane) Cooktop Keypad(Membrane) Display Green LED Electronic clock & timer Control lock capability Audible preheat signal Special function Setting(5 categories) 1.
USING YOUR RANGE GENERAL INFORMA TION GENERAL INFORMA TION Upper oven Rating Label Broil element Model numbers are recorded on the rating label. Rating label is located on the upper front left corner of the upper oven frame. It can be seen by opening the upper oven door.
USING YOUR RANGE CONTROL P ANEL FEA TURES CONTROL P ANEL FEA TURES single single 9 10 11 12 Left Rear element Right Rear element 17 18 16 19 20 single single Left Front element Right Front element UPPER OVEN LOWER OVEN ❶...
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USING YOUR RANGE CONTROL P ANEL FEA TURES CONTROL P ANEL FEA TURES COMMON FUNCTION Single element : Left Rear, Right Rear, Left Front, Right Front Indicator CLOCK : Use to set the time of day. SETTING : Use to set the time of day. START TIME : Use to set delay time.
USING YOUR RANGE To turn on a SINGLE 4. TIMER ON/OFF surface unit (FOR BOTH THE UPPER & LOWER OVEN) (Left Rear, Right Rear, Left Front, Right Front) UPPER UPPER 1. Press ON/OFF pad for the desired element TIMER ON/OFF TIMER ON/OFF position.
USING YOUR RANGE To decrease the oven temperature 6. TIMED COOK, DELAYED TIMED COOK For the Lower oven temperature adjustment. (For the Upper & Lower Bake) 1. Press SETTING pad 2 times for the lower Desired oven, “L-Aj” will appear in the display. START BAKE temperature...
USING YOUR RANGE 11 SABBATH MODE (For both the Upper & Lower oven) Press and hold the SETTING pad 3 seconds (In order to activate or deactivate SABBATH MODE) 12. LOCKOUT (For the Upper & Lower Door lock, Oven & Cooktop control lock) Press and hold the START pad 3 seconds (In order to activate or deactivate LOCKOUT) 13.
COMPONENT ACCESS 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 Display Oven PCB Cooktop PCB SMPS Surface Elements Upper Broil Heater Oven Sensor Upper Door Latch Door Locking Motor...
COMPONENT ACCESS REMOVING THE BACK, CONTROL COVER REMOVING THE BACK, CONTROL COVER AND KEY MEMBRANE ASSEMBL AND KEY MEMBRANE ASSEMBL 6. Remove the 4 screws of the cook-top display PCB WARNING after taking a Relay PCB out. Now, you can take all PCBs out of the controller.
COMPONENT ACCESS REMOVING THE CONTROL POWER SUPPL REMOVING THE CONTROL POWER SUPPL AND POWER CONTROL BOARD (PCB) AND POWER CONTROL BOARD (PCB) 4. There are 3 PCB's (power control board). When WARNING you check PCB, check the proper pcb in default mode and check main pcb.
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COMPONENT ACCESS REMOVING THE SURF ACE ELEMENTS REMOVING THE SURF ACE ELEMENTS AND THE CERAMIC GLASS COOKT AND THE CERAMIC GLASS COOKT Step. 5 WARNING Protect the cooktop surface • DISCONNET power supply cord and turn the assembly over. from the outlet before servicing. •...
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COMPONENT ACCESS REMOVING THE DOOR LA TCH & UPPER DOOR SWITCH REMOVING THE DOOR LA TCH & UPPER DOOR SWITCH (For the Upper oven only) (For the Upper oven only) 5. To remove the upper door switch: WARNING a) If not already done, raise the cooktop (see page 3-4 for the procedure).
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COMPONENT ACCESS REMOVING THE DOOR LA TCH & LOWER DOOR SWITCH REMOVING THE DOOR LA TCH & LOWER DOOR SWITCH (For the Lower oven only) (For the Lower oven only) b) Remove 4 screws to detach 2 hinge suppoters. WARNING •...
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COMPONENT ACCESS f) Remove a screw from a actuating rod guide and unhook the actuating rod Actuarating Rod Actuarating Rod 5. To remove the lower door switch: a) If not already done, raise the cooktop (see page 3-4 for the procedure). b) Remove the lower door switch from the range.
COMPONENT ACCESS REMOVING THE BROIL ELEMENT REMOVING THE BROIL ELEMENT (For the Upper Oven and Lower Oven) (For the Upper Oven and Lower Oven) b) Pull the element forward so that you can WARNING access the terminals and disconnect the wires. •...
COMPONENT ACCESS REMOVING THE EXPOSED BAKE ELEMENT REMOVING THE EXPOSED BAKE ELEMENT (For the Upper Oven and Lower oven) (For the Upper Oven and Lower oven) b) Pull the element forward so that you can WARNING access the terminals and disconnect the wires. •...
COMPONENT ACCESS REMOVING THE OVEN LIGHT & SOCKET ASSEMBL REMOVING THE OVEN LIGHT & SOCKET ASSEMBL (For both the Upper & Lower oven) (For both the Upper & Lower oven) WARNING CAUTION • DISCONNET power supply cord • Be careful not to scratch or chip the from the outlet before servicing.
COMPONENT ACCESS REMOVING THE LA TCH DRIVE ASSEMBL REMOVING THE LA TCH DRIVE ASSEMBL (For both the Upper & Lower oven) (For both the Upper & Lower oven) DOOR LOCKING MECHANISM WARNING The door lock assembly is located at the back side •...
COMPONENT ACCESS REMOVING THE OVEN TEMPERA TURE SENSORS REMOVING THE OVEN TEMPERA TURE SENSORS (For both the Upper & Lower oven temperature sensor) (For both the Upper & Lower oven temperature sensor) 5. To remove an oven temperature sensor, WARNING disconnect the connector from the main harness and remove the two mounting screws in oven •...
COMPONENT ACCESS REMOVING & REPLACING THE LIFT -OFF OVEN DOOR REMOVING & REPLACING THE LIFT -OFF OVEN DOOR (For the Upper door) (For the Upper door) To replace the door: CAUTION Step. 1 • Be careful when removing and Be sure both hinges are lifting the door.
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COMPONENT ACCESS REMOVING & REPLACING THE LIFT -OFF OVEN DOOR REMOVING & REPLACING THE LIFT -OFF OVEN DOOR (For the Lower door) (For the Lower door) To replace the door: CAUTION Step. 1 • Be careful when removing and Firmly grasp both sides of the door at the top. lifting the door.
COMPONENT ACCESS REMOVING THE UPPER OVEN DOOR HANDLE & GLASS (For the Upper door) REMOVING THE UPPER OVEN DOOR HANDLE & GLASS (For the Upper door) 6. To remove the door handle & trim (for Stainless model) WARNING a) Remove the 4 door handle screws and lift the door handle off door trim and slide up the door trim.
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COMPONENT ACCESS 7. To remove a hinge receptacle assembly: c) Lift the inner oven door glass and bracket a) Remove the 4 top liner screws assembly out of the door liner. (See step 3 on page 3-16) b) Place the door liner assembly on a padded work surface with the hinge receptacles over the edge.
COMPONENT ACCESS REMOVING THE OVEN DOOR HANDLE & GLASS (For the Lower door) REMOVING THE OVEN DOOR HANDLE & GLASS (For the Lower door) 6. To remove the door handle & trim (for Stainless model) WARNING a) Remove the 4 door handle screws and lift the door handle off door trim and slide up the door trim.
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COMPONENT ACCESS 7. To remove a hinge hanger assembly: d) Lift the inner oven door glass and bracket a) Remove the 4 top liner screws assembly out of the door liner. (See step 3 on page 3-18) b) Place the door liner assembly on a padded work surface with the hinge hangers over the edge.
COMPONENT ACCESS REMOVING THE OVEN DOOR GASKET REMOVING THE OVEN DOOR GASKET (For the Upper &Lower door gaskets) (For the Upper &Lower door gaskets) 3. Pull the ends of the gasket out of the liner holes. WARNING Liner Hole • DISCONNET power supply cord from the outlet before servicing.
COMPONENT ACCESS REMOVING A SIDE P ANEL REMOVING A SIDE P ANEL 7. Remove the two screws from the left or right side WARNING panel. • DISCONNET power supply cord from the outlet before servicing. • Replace all panels and parts before operating.
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.
Components Test procedures Results Normal: Approximately Oven Sensor 1. Refer to page 3-13 for the servicing procedure 1.09 kΩ ± 10% 2. Measure the resistance after cooling down If not replace (Multiple meter scale: R x 1000) NOTE: Ω Value was tested at room temperature (77F/25˚C) Door switch...
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Components Test procedures Results Normal : Approximately 26.6Ω Upper oven 1. Remove wire leads Bake heater Abnomal : Infinite(opened) 2. Measure resistance after cooling down NOTE: Ω Value was tested at room temperature (77F/25˚C) Be careful the element is sensitive to temperature. Lower oven Normal : Approximately 14.7Ω...
Components Test procedures Results Single surface units: 1. Refer to page 3-5 for the servicing procedure Left Front (LF) 2. Set the Multiple meter scale to the R x 1 Right Front (RF) 3. Disconnect wires from cook-top elements Left Rear (LR) 4.
CHECK THE FAILURE CODE (F-code) When the oven has some failure on cooking, -. Oven may stop operating and F-code will display in display window. -. Some F-codes display immediately(F-3,F-9,F-19), but other codes will store in EEPROM memory and not displayed F-codes can only be viewed by following the below Step 1.
SAFETY CAUTION & ERROR CODE SUMMARY 1.1 Safety Caution • Unless SVC manual indicate that ‘power is on’, normal state is power off. 1.2 Error Code Summary Code Description Operation Opened Sensor Upper Oven Thermistor remains open for over 1 min, after cook starts during cooking.
CHECKING FLOW CHART BY FAIRURE Symptom Check Point 1. Power Failure 1. Check Electric Wiring (Dead) 2. Check the thermostat. 2. No Display 3. Check the SMPS PCB EBR64624703...
CHECKING FLOW CHART BY FAIRURE No Display (No Power) Control Dead Check AC input of SMPS PCB - SMPS PCB, CN1 (Pin 1 and Pin 3) Select a function Any beeping Sound? Replace the Oven System 120V AC? Normal? Replace the Oven Display PCB Replace the SMPS PCB Normal? Replace the SMPS PCB...
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CHECKING FLOW CHART BY FAIRURE No Display (No Power) Check thermostat Normal? Check the connection of L1 and N Replace thermostat from power inlet. Normal? Fix or replace the lead wire...
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CHECKING FLOW CHART BY FAIRURE No Display (No Power) Check and fix the connection 1. Between Cooktop SYSTEM and SMPS PCB. 2. Between Cooktop SYSTEM and Oven system PCB. 3. Between Oven Display and Oven system PCB. Normal? Replace the Oven System PCB...
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CHECKING FLOW CHART BY FAIRURE Symptom Check Point 1. No heating 1. Check Electric Wiring 2. F-9 2. The Heater’s Resistance. 3. F-19 3. Check the Sensor. (Thermister) Heater resistor Check the sensor...
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CHECKING FLOW CHART BY FAIRURE Oven does not heat (including F-9, F-19 Error) No heating Disconnect power Check the electric wiring 1. Harness of Relay connection. 2. Each heater’s connection. 3. Oven System and Relay PCB connection(CN11, CN12) UPPER LOWER Harness connection check Normal? Fix or replace the lead wire...
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CHECKING FLOW CHART BY FAIRURE 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 and ⑤) (measure the resistance after cooling down) UPPER Normal Resistor...
CHECKING FLOW CHART BY FAIRURE Oven does not heat (Including F-9, F-19 Error) Normal? Replace the error heater Connect the power Check the value of Thermister by using the test mode • To enter the test mode, follow these steps: 1.
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CHECKING FLOW CHART BY FAIRURE Oven does not heat (Including F-9, F-19 Error) Normal? Disconnect the oven sensor and check the value (measure the resistance after cooling down) Normal:approximately 1.06 kΩ at 65°F ~ 1.12 kΩ at 85°F. Normal? Replace the oven sensor Replace the Relay PCB Replace the Oven SYSTEM PCB...
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CHECKING FLOW CHART BY FAIRURE Symptom Check Point 1. Cooktop Not 1. Check Electric Wiring working 2. Check the Heater Resistance Check the Heater Resistance 9-10...
CHECKING FLOW CHART BY FAIRURE Cooktop does not heat No heating (All or a part of cooktop heaters) Disconnect power Check the loose connection cook-top heater and harness Normal? Reconnect. If defective harness, replace or fix Check the loose connection (Oven System PCB and Cooktop PCB) Normal? Reconnect.
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CHECKING FLOW CHART BY FAIRURE Cooktop does not heat Check the cooktop heaters (measure the resistance between CN10,CN11,CN12,TAB11,TAB09 and SMPS CN1 pin 3) RY18 RY19 DLB Out1 DLB Out2 DLB Out1 DLB Out2 Normal : approximately 100Ω 9-12...
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CHECKING FLOW CHART BY FAIRURE Cooktop does not heat Normal? Replace the Cook-top heater Replace the Cook-top system 9-13...
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CHECKING FLOW CHART BY FAIRURE Symptom Check Point 1. Door Lock System 1. Check the Electric wiring Failure 2. Check the Motor’s Resistance 2. F-10, F-20 9-14...
CHECKING FLOW CHART BY FAIRURE → → F-10, F-20 Error Door lock system 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.
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CHECKING FLOW CHART BY FAIRURE Door lock system error → → F-10, F-20 Error Check the door locking motor (measure the resistance) normal: approximately 2.6 kΩ abnormal: infinite or below 5 Ω Normal? Replace the door locking Check the looseness of CN08 motor Normal? Reconnect...
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CHECKING FLOW CHART BY FAIRURE Door lock system error → → F-10, F-20 Error Check the Oven Relay PCB’s electric connection (CN01, CN03) Check the connection between Oven System PCB and Relay PCB(CN11, CN12) Normal? Reconnect Replace the Oven Relay PCB Normal? Replace the Oven System PCB 9-17...
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CHECKING FLOW CHART BY FAIRURE Symptom Check Point 1. Sensing Fail 1. Check the electric wiring 2. F-1 2. Check the test Mode 3. F-2 3. Check the Sensor (Thermistor) resistance 4. F-4 (approximately 1.06 kΩ at 65°F ~ 1.12 kΩ at 85°F.) 5.
CHECKING FLOW CHART BY FAIRURE Oven sensing error → → F-1, F-2, F-3, F-4 error Main oven sensing failed Connect the power Check the value of thermistor by using the test mode • To enter the testmode, follow these steps: 1.
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CHECKING FLOW CHART BY FAIRURE Oven sensing error → → F-1, F-2, F-3, F-4 error Normal? Disconnect the oven sensor and check the value (measure the resistance after cooling down) Normal:approximately 1.06 kΩ at 65°F ~ 1.12 kΩ at 85°F. Normal? Replace the oven sensor Replace the Oven Relay PCB...
CHECKING FLOW CHART BY FAIRURE Symptom Check Point 1. Oven hot 1. Check the Resistance of the Relay. 2. F-6 2. Check the Sensor (thermistor) resistance 3. F-16 (approximately 1.06 kΩ at 65°F ~ 1.12 kΩ at 85°F.) Check the resistance of relays Check the Sensor (thermistor) resistance 9-21...
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CHECKING FLOW CHART BY FAIRURE Oven hot error → → F-6, F-16 error Oven is hot (F-6, F-16) Disconnect the power and oven sensor. Check the oven sensor value (measure the resistance after cooling down) Normal:approximately 1.06 kΩ at 65°F ~ 1.12 kΩ at 85°F Normal? Replace the oven sensor Remove the Relay PCB harness...
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CHECKING FLOW CHART BY FAIRURE Oven hot error → → F-6, F-16 error Normal? Replace the Relay PCB Replace the Oven SYSTEM PCB 9-23...
CHECKING FLOW CHART BY FAIRURE No key input Or F-3 Key does not input(including F-3) If the key error occurred in the Oven Display LED, check the oven system. If the problem happened in the Cooktop Display LED, check the cooktop system. Check the connection between Oven System PCB’s CN03 and Cooktop Systme PCB’s CN21 Normal? Reconnect...
CHECKING FLOW CHART BY FAIRURE F-11 error (communication error) F-11 error Check the connection between Oven System PCB’S CN06 and Oven System PCB’S CN13 This Harness Normal? Reconnect Replace the Oven System PCB Reset failure log and Check the F-code. 1.
TROUBLE SHOOTING PROBLEMS POSSIBLE CAUSES & FAULTS SOLUTIONS Oven not operating. • Bad power control board (PCB) • Test and/or replace PCB • Power outage • Verify power is present at unit. • Verify that the circuit breaker is not tripped •...
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TROUBLE SHOOTING PROBLEMS POSSIBLE CAUSES & FAULTS SOLUTIONS Electronic timer will not • Failed main power control board • Replace power control board(PCB) accept Programming. Electronic timer will not • Failed main power control board • Replace power control board(PCB) accept Programming.
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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 •...
SCHEMATIC DIAGRAM WARNING • DISCONNET 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. RADIANT COOK-TOP Wattage RR:1200W...
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. UPPER BAKE/WARM LOWER BAKE 11-2...