LG LREL6321S Service Manual Download Page 53 | Manualshive

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9-15

Copyright ©

LG Electronics Inc. All rights reserved.

Only training and service purposes

CHECKING FLOW CHART BY FAILURE

No

Replace the Main PCB

2

Yes

Is the resistance of

thermistor normal?
Check :
Pin 1 and 2 of CN10 of Main PCB
Normal – approximately

0.6~1

K ohm at 25℃

3

Replace the Thermistor

CN10

2 1

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Summary of Contents for LREL6321S

Page 1: ...le or other electronic means publication modification copying or transmission of this Service Manual is STRICTLY PROHIBITED unless you have obtained the prior written consent of the LG Electronics entity from which you received this Service Manual The material covered by this prohibition includes without limitation any text graphics or logos in this Service Manual Copyright 2020 LG Electronics Inc...

Page 2: ...ct 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 Electrical leads and cables should not be allowed to touch the oven Rating plate is located on the left side of warming drawer The power supply of the appliance should be turned off when it is being repaired FORWARD LG Electronics assumes no responsibil...

Page 3: ...Adjustment Preheating Alarm Light On Off Beeper Volume Temperature Unit F or C Bake Timed Bake Delayed Timed Bake Broil Warm Changing hour mode on clock 12HR 24HR Easy Clean Auto Conversion COMPONENT ACCESS 3 1 3 14 Component Locations 3 1 Removing the Rear Motor Cover and Control Assembly 3 2 Removing PCBs Main PCB and Main PCB Tact Display PCB and Wifi PCB 3 3 Removing the Surface Element and th...

Page 4: ... 4 4 Center Rear CR Warming Zone 4 5 COMPOSITION OF CONTROL 5 1 5 3 Wiring Diagram 5 1 Key Matrix 5 2 Main PCB 5 3 Tact Display PCB 5 3 LED Module 5 3 CHECK THE FAILURE CODE 6 1 FAILURE CODE SUMMARY 7 1 BASIC CHECK SUMMARY 8 1 CHECKING FLOW CHART BY FAILURE 9 1 9 14 Power Failed Dead No display 9 1 9 4 No heating F9 9 5 9 9 Sensing Fail F1 F2 9 10 9 12 Oven hot F 6 9 13 9 15 Keypad Failure F3 erro...

Page 5: ...ONNECT all grounding devices Failure to do so can result in severe personal injury death or electrical shock DO NOT touch heating elements or interior surfaces of oven Heating element may be hot even though they are dark in color Interior surfaces of an oven become hot enough to cause burns During and after use do not touch or let clothing or other flammable materials contact heating elements or i...

Page 6: ...nti tip bracket installation WARNING DO NOT touch heating elements or interior surfaces of oven Heating element may be hot even though they are dark in color Interior surfaces of an oven become hot enough to cause burns During and after use do not touch or let clothing or other flammable materials contact heating elements or interior surfaces of oven until they have had sufficient time to cool Oth...

Page 7: ...s Build up of pressure may cause container to burst and result in injury Keep Oven Vent Ducts Unobstructed the oven vent is located above the left rear surface unit this area could become hot during oven use Never block this vent and never place plastic or heat sensitive items on vent Placement of Oven Racks Always place oven racks in desired location while oven is cool If rack must be moved while...

Page 8: ...ghts reserved Only training and service purposes GENERAL The Model Serial Number label and Tech Sheet locations are shown below Model Serial Number Location MODEL SERIAL NUMBER LABEL AND TECH SHEET LOCATIONS Tech Sheet Location On Rear Cover ...

Page 9: ...kout Broiler pan Type Element Oven Interior W x H x D Exterior Width Exterior Height Exterior Depth Net weight Lbs Kg Rating 30 Freestanding STS Keypad Knob LED Yes Yes Yes Setting 6 categories 1 Set the hour mode on the clock 12 or 24 hours 2 Adjust the oven temperature 3 Activate deactivate the preheating alarm light 4 Set the beeper volume Hi Lo Off 5 Switch the temperature scale between Fahren...

Page 10: ...from rating label This avoids incorrect shipments and delays Please refer to parts reference material when ordering replacement parts Functional Operation Bake Mode Top and hidden bottom elements operate during bake Bake can be used to cook foods which are normally baked Oven must be preheated Broil Mode Top element operates during broil Broil can be used to cook foods which are normally broiled A...

Page 11: ...sis 7 Cooktop Control COOKTOP HOT Indicator The COOKTOP HOT indicator appears in the display as long as any surface cooking area is too hot to touch It remains on after the element is turned off and until the surface has cooled to approximately 150 F The COOKTOP HOT indicator also appears during the self clean cycle Flashing Time If your oven displays a flashing clock press Clock or press any key ...

Page 12: ...gram during cooking or Erase during programming USING YOUR RANGE 3 TO TURN ON OFF THE OVEN LIGHT The oven light automatically turns ON when the door is opened 1 The oven light may also be manually turned ON or OFF by press the OVEN LIGHT key 2 Knocking twice on the glass panel turns the interior light on or off Note 1 The oven light cannot be turned on if self clean feature is active 2 The light t...

Page 13: ...Off 3 Press Start to accept the change 8 TEMPERATURE UNIT F OR C 1 Press Settings repeatedly until Unit appears in the display 2 Press 1 to select F Fahrenheit or C Celsius 3 Press Start to accept the change 9 BAKE TIMED BAKE DELAYED TIMED BAKE This feature can also be used with the CONVECTION BAKE and CONVECTION ROAST modes 10 BROIL START KEEP WARM Press Settings repeatedly until Auto appears in ...

Page 14: ...ice purposes 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 Oven Sensor Oven Light Surface Elements Main PCB Hinge Hanger Door Switch Bake Heater Broil Heater ...

Page 15: ...e covers by removing the screw 4 Remove the 20 screws from the rear cover and remove the cover REMOVING THE REAR MOTOR COVER AND CONTROL ASSEMBLY 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 CAUTION Be careful when yo...

Page 16: ... 2 4 When you check PCB check the proper PCB in default mode and check main PCB NOTE Refer to the page 5 1 5 5 for composition of control board 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 CAUTION Be careful when you ...

Page 17: ...om mismating COMPONENT ACCESS CERAMICGLASSCOOKTOPREMOVAL Step 1 Unplug the cord or disconnect power Step 2 Remove lamp controller and back cover See the page 3 2 Step 3 Remove wiring from the cooktop assembly Step 4 Open oven door and remove the 3screws located at the front of the cook top then close the door Step 5 Lift up the cooktop assembly and turn the cooktop assembly over protect the cookto...

Page 18: ...rear brackets b Pull the element forward so that you can access the terminals and disconnect the wires 2 front bracket screws 3 terminals Broil heater thermistor 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 CAUTION Be...

Page 19: ...ssembly sequence 1 2 COMPONENT ACCESS 1 Unplug range or disconnect power 2 Pull the range out of its mounting location so that you can access the rear of the unit 3 Remove rear and motor cover See the page 3 2 4 Remove 4 screws and a powercord 5 Remove 8 screws and detach the bake heater cover from the range Disconnect 2 wiring 2 bake heater receptacles 6 Use the nipper to cut the 10 connections o...

Page 20: ...l the socket out of the liner NOTE If it is too difficult to remove the socket from the front of the oven you will have to push the socket out from the back of the unit Socket Clips 6 Disconnect the wires from the socket terminals Viewed From Rear Panel CAUTION Be careful not to scratch or chip the oven liner paint when you remove the oven light socket in the next step WARNING DISCONNECT power sup...

Page 21: ...ws b Remove rear cover motor cover See step 3 4 on page 3 2 c Disconnect the wire connection d Remove the oven 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 CAUTION Be careful when you work on the gas range hand...

Page 22: ...the drawer rails on the guides 2 Push the drawer back until it stops 3 Lift the front of the drawer and push back until the stops clear the guides 4 Lower the front of the drawer and push back until it closes REMOVING REPLACING THE DRAWER CAUTION Disconnect the electrical power to the range at the main fuse or circuit breaker panel Failure to do so can result in severe personal injury death or ele...

Page 23: ...the locked position Step 5 Close the oven door To remove the door Step 1 Fully open the door Step 2 Pull the hinge locks down toward Fig 1 the door frame to the unlocked position Step 3 Firmly grasp both sides of the door at the top Step 4 Close door to the door removal position which is approximately 5 degrees refer to the Fig 2 Step 5 Lift door up and out until the hinge arm is clear of the slot...

Page 24: ...rface with the front glass facing down 3 Remove the 2 top door screws 4 Remove the 7 bottom screws from the door liner COMPONENT ACCESS REMOVING THE OVEN DOOR HANDLE Door Handle screw 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 elect...

Page 25: ...r screws See step 3 4 on page 3 17 b Place the door liner assembly on a padded work surface with the hinge hangers over the edge c Remove the 4 top door screws d Lift the hinge hanger out of the door liner slot 8 Lift the insulation cover inner oven door glass and bracket assembly out of the door liner Insulation cover Inner oven door Glass Bracket Hinge Door frame ...

Page 26: ...e removed 3 Pull the ends of the gasket out of the liner holes 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 CAUTION Be careful when you work on the electric range handling the sheet metal part Sharp edge may be presen...

Page 27: ...u can access the back of the unit 4 Remove the rear motor cover and control assembly See the page 3 2 5 Raise the cooktop assembly See the page 3 5 For the procedure NOTE put the cooktop assembly down on the side panel which is not detached 6 Remove 4 screws from the side panel WARNING DISCONNECT power supply cord from the outlet before servicing Replace all panels and parts before operating RECON...

Page 28: ...power cord unplugged from outlet and with wiring harness or connectors disconnected Before testing any of components perform the following checks WARNING Disconnect power supply cord from the outlet before servicing Replace all panels and parts before operating Reconnect all grounding devices after servicing Failure to do so can result in death or electrical shock NOTE Below Ω value were tested at...

Page 29: ...e after cooling down Multiple meter scale R x1 Normal Below 5 Ω If not replace Bake heater 1 Remove wire leads 2 Measure resistance after cooling down Normal Approximately 23Ω Abnomal Infinite opened NOTE Ω Value was tested at room temperature 77F 25 C Be careful the element is sensitive to temperature Broil heater 1 Remove wire leads 2 Measure resistance after cooling down Normal Approximately 13...

Page 30: ...lements 4 Touch the ohmmeter test leads to the element terminal and 1A The meter should indicate 46 Ω 10 Normal Approximately 46 Ω If not replace Element terminal Element terminal 1A 2A 5 Touch the ohmmeter test leads to limiter terminals 1B and 2B With the temperature below 150 F the meter should indicate an open circuit infinite With the temperature above 150 F the meter should indicate continui...

Page 31: ...nnect wires from cook top elements 4 Touch the ohmmeter test leads to the E1 1A and E2 1A the meter should indicate E1 1A 38 Ω 10 E2 1A 30 Ω 10 Normal Approximately 38 Ω Normal Approximately 30 Ω 5 Touch the ohmmeter test leads to limiter terminals 1B and 2B With the temperature below 150 F the meter should indicate an open circuit infinite With the temperature above 150 F the meter should indicat...

Page 32: ...r Rear CR Element Warming Zone Plane Heater 1 Refer to page 3 6 for the servicing procedure 2 Set the Multiple meter scale to the R x 1 3 Disconnect wires from CR elements 4 Touch the ohmmeter test leads to the between element terminal The meter should indicate 571 Ω 10 Normal Approximately 571 Ω If not replace Element terminal ...

Page 33: ...5 1 Copyright LG Electronics Inc All rights reserved Only training and service purposes COMPOSITION OF CONTROL Wiring Diagram ...

Page 34: ...5 2 Copyright LG Electronics Inc All rights reserved Only training and service purposes COMPOSITION OF CONTROL Main PCB Tact Display PCB Front Back Controller assembly ...

Page 35: ...5 3 Copyright LG Electronics Inc All rights reserved Only training and service purposes COMPOSITION OF CONTROL Main PCB Tact Display PCB LED Module ...

Page 36: ...ation Check the failure code as follow these steps 1 press the clear Button 2 press the BAKE and BROIL Button at the same time If the oven has some failure the oven will show the failure code like FIG 1 It shows the type of F code and times of failure alternately for each two seconds If the oven do not has any failure the Oven will show it like FIG 2 NOTE After checking for the F code press the CL...

Page 37: ...usly short for 60 seconds The oven temperature is over 650 F continuously during 2 minutes on cooking except self cleaning EXCEPT PROOF and WARM Case 1 start temperature does not exceed 130 F and oven temperature is less equal than 150 F and max oven temperature is less equal than start oven temp Case 2 oven temperature is less equal than 100 F over 5 minutes on preheating 1 Wiring 2 Oven Sensor 1...

Page 38: ...K PINK BL BLUE BN BROWN GN GREEN GY GRAY OR ORANGE VI VIOLET Symptom Oven lamp not operating Check the Lamp coil s resistance Normal approximately 20 40Ω Symptom Sensor error or no heating F1 F2 F9 Check Sensor resistance approximately 1 06 kΩ at 65F 1 12 kΩ at 65F 1 2 3 Symptom Oven hot F6 Check All heater relays are open short Symptom no heating F9 Check related 2 4 ...

Page 39: ...right LG Electronics Inc All rights reserved Only training and service purposes CHECKING FLOW CHART BY FAILURE Symptom Check Point 1 Power Failure Dead 2 No Display 1 Check Electric Wiring 2 Check the Main PCB ...

Page 40: ...connection of Main PCB CN01 Nomal Yes No Yes Plug the unit Power Failed Dead No display Check the button beep Touch the Clear button Can hear the beep sound Go to 7 On the next Page No Reconnect If defective harness replace or fix 1 No Yes Check the connection of Power Cord Normal Reconnect If defective harness replace or fix 2 3 ...

Page 41: ... CHART BY FAILURE Check the AC input of Main PCB Main PCB 1pin 3pin of CN01 120V AC No Yes Replace the main PCB 4 No Yes Check the connection of L1 and N at Terminal block Normal Reconnect 5 No Yes Check the Thermostat Normal Short Abnormal Open Normal Replace the Thermostat Replace the main PCB 6 CN01 ...

Page 42: ... CHART BY FAILURE Check the connection States between CN21 of Main PCB and Display PCB Is it OK No Yes Replace the Main PCB 7 Reconnect If defective harness replace or fix If the same phenomenon occurs even though after fixed connection you should replace the Display PCB CN21 CN21 Display PCB Main PCB ...

Page 43: ... Inc All rights reserved Only training and service purposes CHECKING FLOW CHART BY FAILURE Symptom Check Point 1 No heating 2 F9 1 Check Electric Wiring 2 Check Heater s Resistance 3 Check the Sensor thermistor TAB01 06 CN10 CN10 ...

Page 44: ...ning and service purposes CHECKING FLOW CHART BY FAILURE Oven does NOT heat Is the Connector disconnected or loose 1 Electric wiring of Relay PCB All taps 2 Electric wiring of electric element Yes Reconnect If defective harness Replace or fix 1 Unplug the unit No ...

Page 45: ...ll rights reserved Only training and service purposes CHECKING FLOW CHART BY FAILURE Check the resistance of each heater Normal Measure the resistance after cooling down The resistance is shown below No Replace the failed igniter 2 Yes ...

Page 46: ...the same time again 4 3 click t3 Start Normal Themistor value at room temp is from 70 F to 90 F as the above figure CHECKING FLOW CHART BY FAILURE Go to No6 Yes No Yes 3 4 Range Of the resistance Plug the unit Is the value of thermistor normal Refer below Check with the test mode Heater Resistance Ω Approximately Broil 13 7 Bake 16 5 Type of F code Software version Times of the occurred failure 2 ...

Page 47: ... training and service purposes CHECKING FLOW CHART BY FAILURE Is the resistance of thermistor normal Check Pin 1 and 2 of CN10 in main PCB Normal approximately 0 6 1K ohm at 25 No Replace the failed Thermistor 5 Yes Unplug the unit CN10 6 Replace the Main PCB ...

Page 48: ...cs Inc All rights reserved Only training and service purposes CHECKING FLOW CHART BY FAILURE Symptom Check Point 1 Sensing Fail 2 F1 3 F2 1 Check the Electric wiring 2 Check the sensor thermistor resistance CN10 CN10 Pin 1 and 2 ...

Page 49: ...and service purposes CHECKING FLOW CHART BY FAILURE Main oven sensing error F 1 F 2 error Is the Connector disconnected or loose 1 Sensor connection 2 CN10 of Main PCB Yes Reconnect or adjust the connection 1 No Unplug the unit CN10 Sensor connection Sensing Fail F1 F2 ...

Page 50: ... Only training and service purposes CHECKING FLOW CHART BY FAILURE No Replace the defective Thermistor 2 Yes CN10 Is the resistance of thermistor normal Check Pin 1 and 2 of CN10 of Main PCB Normal approximately 0 6 1K ohm at 25 2 1 3 Replace the Main PCB ...

Page 51: ...13 Copyright LG Electronics Inc All rights reserved Only training and service purposes CHECKING FLOW CHART BY FAILURE Symptom Check Point 1 Oven hot 2 F 6 1 Check the Resistance of the Relay TAB01 06 CN10 ...

Page 52: ...ctronics Inc All rights reserved Only training and service purposes CHECKING FLOW CHART BY FAILURE Normal Abnormal Check the DLB Relay damage measure the resistance Yes Replace the Main PCB 1 No Unplug the unit F6 Oven Hot ...

Page 53: ...erved Only training and service purposes CHECKING FLOW CHART BY FAILURE No Replace the Main PCB 2 Yes Is the resistance of thermistor normal Check Pin 1 and 2 of CN10 of Main PCB Normal approximately 0 6 1K ohm at 25 3 Replace the Thermistor CN10 2 1 ...

Page 54: ...9 16 Copyright LG Electronics Inc All rights reserved Only training and service purposes CHECKING FLOW CHART BY FAILURE Symptom Check Point 1 Key not working 2 F3 Check the Key working CN20 ...

Page 55: ...or Or button does not input CHECKING FLOW CHART BY FAILURE Check the beep sound Does the beep sound when the power is turned on again No Replace the Main PCB 1 Yes Unplug the unit Is the connector disconnected or loose Check CN20 Is it OK Yes No Reconnect or adjust the connection 4 CN20 CN20 Replace the Display PCB ...

Page 56: ...se is open Loose or bad wiring Defective light socket Defective door switch Test and or replace PCB Refer to the page 9 1 9 3 Verify power is present at unit Verify that the circuit breaker is not tripped Replace household fuse capacity Check circuit breaker Repair or replace wiring see wiring diagrams Test and or replace element Test and or replace PCB Verify all connections are clean and tight r...

Page 57: ...to latch system Defective Oven Sensor Bad main PCB Improper use of oven e g being used to heat the home Worn or broken broil stop roller Replace main PCB Replace main PCB Verify power is present at unit Verify that the circuit breaker is not tripped Replace household fuse but do not fuse capacity Refer to Owner s manual instructions Verity all connections are clean and tight replace broken wire Te...

Page 58: ...ontrolled Oven sensor needs to be adjusted Adjust hinges or replace hinges Adjust or replace hinges Adjust hinges outward Do not cover racks with foil Install tempered glass toward the heat Apply a small amount of vegetable oil to a paper towel and wipe the edges of the oven racks with the paper towel Do not spray with pam or other lubricant sprays Notify customer Assurance department Minor smokin...

Page 59: ... Electronics Inc All rights reserved Only training and service purposes EXPLODED VIEW EV INTRODUCTION DOOR PARTS DRAWER PARTS COOKTOP PARTS CONTROLLER PARTS CAVITY PARTS MODEL Customer Model Product Code SVC Model ...

Page 60: ...LG Electronics Inc All rights reserved Only training and service purposes DOOR PARTS EV 1020 1009 1021 1733 1466 1704 W321 1704 1733 W101 W321 1735 102L 102S W101 W108 102S 102U 1000 W243 W225 W225 W222 1801 1028 ...

Page 61: ...Copyright LG Electronics Inc All rights reserved Only training and service purposes EV CONTROLLER PARTS 2381 2034 2084 2050 2006 3075 2084 2087 2441 2052 H212 H211 2037 2028 2128 2036 H213 2374 ...

Page 62: ...Copyright LG Electronics Inc All rights reserved Only training and service purposes EV COOKTOP PARTS 3014 3056 3302 3401 3302 3303 3303 3204 3204 3204 3207 3204 3022 ...

Page 63: ...Copyright LG Electronics Inc All rights reserved Only training and service purposes EV DRAWER PARTS 8603 8514 8501 8507 3541 3541 3036 851D 851D 8530 8524 850R 850L 8530 8508 8503 ...

Page 64: ...training and service purposes EV CAVITY PARTS 3501 5014 5539 5556 5021 W301 W230 W230 5506 5513 5700 4002 W225 W225 5516 5512 5512 5515 5032 5401 2048 5517 5452 5509 5016 3013 5510 5556 W301 8511 W229 9381 5511 5532 5533 5514 3063 5508 5641 3031 5641 5019 ...

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