LG LRE3085ST Service Manual Download Page 72

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9-18

CHECKING FLOW CHART BY FAILURE

Is the Connector
disconnected or loose?
1. Sensor connection
2. CN13 of Main PCB

Yes

Unplugged the unit

Sensing Fail, F1, F2?

Yes

Reconnect

or adjust the

connection

Sensor
connection

CN13
connection

Is the resistance of
thermistor normal?

Check:

Pins 1and 2 of CN13 wiring in main PCB

Normal-

approximately 1.09k

Ω

at 25˚C

Replace the

defected

thermistor

CN13

Is the value of thermistor
normal?
Check with the test mode

To enter the test mode, follow these steps:

1. press the “clear” key
2. press the “BAKE”, “BROIL” button

at the same time

3. press the “BAKE”, “BROIL” button

at the same time again.

Software version is displayed at the left digits.

4. press the NUM “3” button

Normal :

the sensor value is from 70˚F

to 90

˚F

at room temp.

Yes

Go to No 1

Plug the unit

Replace the Main PCB.

Summary of Contents for LRE3085ST

Page 1: ...lectric Range SERVICE MANUAL MODEL LRE3085ST CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL Website http biz lgservice com P NO MFL37118326 May 2013 Printed in Korea 삼 흥 정 판 Internal Use Only ...

Page 2: ...our 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 responsibility for any repairs made on ...

Page 3: ... Self Clean Easy Clean Warming drawer COMPONENT ACCESS 3 1 3 21 Component Locations 3 1 Removing The Lamp Controller Back Cover and Controller Assembly Membrane PCB Support 3 2 3 4 Removing PCBs Main PCB and Relay PCB 3 5 Removing the Surface Element and the Ceramic Glass Cooktop 3 6 Removing the Door Latch and the Door Switch 3 7 Removing the Outer Broil Element Sheathed Heater 3 8 Removing the I...

Page 4: ...Oven Relay PCB 5 5 Cook top display PCB 5 6 Key Pad 5 6 SVC TEST MODE 6 1 CHECK THE FAILURE CODE 7 1 7 2 Check the Failure Code 7 1 Failure Code Summary 7 2 BASIC CHECK SUMMARY 8 1 8 2 CHECKING FLOW CHART BY FAILURE 9 1 9 25 Power Failed Dead No display 9 1 9 3 No heating F9 9 4 9 8 Cook top No heating 9 9 9 12 Door Lock System Failure F10 9 13 9 16 Sensing Fail F1 F2 9 17 9 18 Oven hot F6 9 19 9 ...

Page 5: ...es 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 interior surfaces of oven u...

Page 6: ...on 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 Other surfaces of the applian...

Page 7: ... goes on or three long beeps sound oven is malfunctioning in the self clean mode Turn off or disconnect appliance from power supply and have serviced by a qualified technician VENTILATING HOODS Clean Ventilating Hoods Frequently Grease should not be allowed to accumulate on hood or filter When flaming foods under the hood turn the fan on OVEN Use Care When Opening Door Let hot air or steam escape ...

Page 8: ...erial Number label and Tech Sheet locations are shown below Model Serial Number Location MODEL SERIAL NUMBER LABEL MODEL SERIAL NUMBER LABEL AND TECH SHEET LOCA AND TECH SHEET LOCATIONS TIONS Tech Sheet Location On Rear Cover ...

Page 9: ...xterior Height Exterior Depth Net weight Lbs Kg Rating 30 Freestanding STS Keypad Membrane Keypad Membrane Scroll VFD Yes Yes Yes Option 6 categories 1 Convection auto conversion 0n 0ff 2 Thermostat Adjustment 3 Language English Spanish French 4 Preheating alarm light On Off 5 Beeper Volume loud normal low mute 6 Temperature unit F C Ceramic glass 5 6 1 200 6 1 200 warming zone Dual 6 9 1 400 3 20...

Page 10: ...ly broiled All foods should be turned at least once except fish which does not need to be turned Convection Bake Roast Mode Upper element lower element Rear element some model and fan operate during convection bake Convection bake should be used for cooking casseroles and roasting meats Oven should be preheated for best results when using convection bake Pans do not need to be staggered Cooks appr...

Page 11: ...roduts 9 SPEED BROIL Press to select the SPEED BROIL function 10 FAVORITES PAD Press to set favorite cooking 11 KIDS MEAL Press to select the Kids Meal function 12 CLOCK PAD Press before setting the time of day 13 COOK TIME PAD Press and then use the number pads to set the amount of time you want your food to cook The oven will shut off when the cooking time has run out 14 START TIME PAD Use along...

Page 12: ... door is opened The oven light may also be manually turned ON or OFF by pressing the OVEN LIGHT pad Note The oven light cannot be turned on if self clean feature is active 4 TIMER ON OFF To cancel timer at any time touch TIMER ON OFF pad Note 1 If you press TIMER ON OFF pad once this allows you to select minutes for example if you press 5 and 6 it means 56 minutes 2 If you press TIMER ON OFF pad t...

Page 13: ...TES 9 WARM PROOF 10 OVEN LOCKOUT 11 CHANGING HOUR MODE ON CLOCK 12HR 24HR 12 SELF CLEAN 13 Easy clean 2 4 USING YOUR RANGE START FAVORITES Once Bread Twice Meat 3 times Chicken START SELF CLEAN Once 4 hour Twice 5 hour 3 times 3 hour START WARM PROOF Press and hold the START pad for 3 seconds to activate or reactivate LOCKOUT Press and hold the CLOCK pad for 3 seconds Press 1 pad for 12 hour 2 pad...

Page 14: ...e in the Warming Drawer To set the warming drawer control 1 Press the WARMING DRAWER SET OFF button near the number buttons The indicator light will flash If no further buttons are pressed within 25 seconds the display will clear 2 Use the number buttons to set the power level 1 for LOW 2 for MEDIUM and 3 for HIGH 3 When the food is ready or to cancel press the WARMING DRAWER SET OFF button Note T...

Page 15: ... locations are shown below COMPONENT LOCA COMPONENT LOCATIONS TIONS Broil Heater Convection Heater Oven Light Door Switch Surface Elements Door Locking Motor Micro Switch Main PCB Hinge Hanger Warming Drawer Heater Oven Sensor Door Latch Assembly Convection Motor Oven Relay PCB Bake Heater Broil Heater Cook Top Display PCB ...

Page 16: ...remove the lamp cover 4 Remove 12 screws from the controller cover and remove the controller cover 5 Remove the 4 screws from the back cover and remove the back cover REMOVING THE LAMP REMOVING THE LAMP CONTROLLER BACK COVER AND CONTROLLER BACK COVER AND CONTROLLER ASSEMBL CONTROLLER ASSEMBLY MEMBRANE PCB SUPPOR Y MEMBRANE PCB SUPPORT T WARNING DISCONNECT power supply cord from the outlet before s...

Page 17: ...side panel 10 Remove 4 screws from the controller assembly back guard R L 11 Remove 6 screws from the controller assembly 12 For serving the KEY Membrane the controller sub assembly should be separated in whole Both Control panel and KEY Membrane are 1 service part COMPONENT ACCESS ...

Page 18: ...he rear panel 3 Remove 2 screws from the lamp cover and remove the lamp cover 4 Remove 12 screws from the controller cover and remove the controller cover 5 Remove the 4 screws from the back cover and remove the back cover REMOVING THE LAMP REMOVING THE LAMP CONTROLLER BACK COVER AND CONTROLLER BACK COVER AND CONTROLLER ASSEMBL CONTROLLER ASSEMBLY MEMBRANE PCB SUPPOR Y MEMBRANE PCB SUPPORT T WARNI...

Page 19: ...check PCB check the proper PCB in default mode and check Main PCB NOTE Refer to the page 5 1 5 6 for composition of control board Main PCB Relay 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 electrical shock CAUTION Be careful when...

Page 20: ...HE CERAMIC GLASS COOKTOP OP 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 3 Screws Step 6 To remove the surface elements a Remove the wires from the element and limiter terminals b Remove the element brackets for the e...

Page 21: ...e the cooktop See the page 3 6 for the procedure b Remove 3 screws from a cooktop barrier c Remove wiring from the door switch d Remove the door switch from the range To do this squeeze tab on the switch and push the switch in front 2 Screws An actuating rod Unhook the actuating rod Push WARNING DISCONNECT power supply cord from the outlet before servicing Replace all panels and parts before opera...

Page 22: ...2 screws of the rear bracket do not only fasten broil heater s rear bracket but also a thermistor While servicing broil elements the thermistor also should be disassembled 2 upper bracket screws 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 device...

Page 23: ...e ceramic wools from the cavity assembly and remove 1 screw from a charcoal heater bracket Remove the charcoal heater bracket 8 Remove 4 screws from the bracket Detach the bracket and 2 conectors charcoal heater from the charcoal heater assembly WARNING DISCONNECT power supply cord from the outlet before servicing Replace all panels and parts before operating RECONNECT all grounding devices Failur...

Page 24: ...oal heater can be detached NOTE Although all charcoal assembly are not detached the only charcoal heater can be replaced after removing the mesh brackets and wirings However the charcoal heater is very fragile I recommend that the charcoal heater be replaced after detaching the whole charcoal heater assembly NOT detaching the only charcoal heater Mesh 2 Brackets ...

Page 25: ...nd a insulation ceramic wool up and bend 2 flanges up 3 11 COMPONENT ACCESS 7 Carefully pull the hidden bake element out of the range 8 After servicing the heater when re assembling parts be careful of the drawer harness connector The hole for drawer harness is different from 2 holes for bake heater If using a same hole drawer harness and heater can touch and drawer harness can be damaged REMOVING...

Page 26: ...de can be replaced from inside oven 6 To remove the fan motor assembly a Remove lamp controller and back cover See the page 3 2 b Remove 3 screws from the fan motor bracket and disconnect 2 wiring connections c Pull the fan motor out of the rear panel and the motor can be detached REMOVING THE CONVECTION REMOVING THE CONVECTION F FAN BLADE AND F AN BLADE AND FAN MOT AN MOTOR OR Nut Washer Fan Cove...

Page 27: ...ips Socket Clips Socket Clips Socket Clips Socket Clips Socket Clips Socket Clips Socket Clips Socket Clips Socket Clips Socket Clips Socket Clips Socket Clips Socket Clips Socket Clips Socket Clips Socket Clips Socket Clips Socket Clips Socket Clips Socket Clips Socket Clips Socket Clips Socket Clips Socket Clips Socket Clips Socket Clips Socket Clips Socket Clips Socket Clips Viewed From Rear Pa...

Page 28: ...trol board chip operates the motor 2 The cam moves the door hook connected to latch rod from unlocked position to locked position from locked Position to unlocked position 3 The cam activates the micro switch that causes the motor to stop 4 The locked status remains until the range temperature drops to approximately 500F after end of the self clean or lock out feature is reactivated The motor oper...

Page 29: ...oven temperature sensor forward in order to access a connector and disconnect the wirings 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 pa...

Page 30: ...MING DRA ARMING DRAWER ELEMENT WER ELEMENT TEMPERA TEMPERATURE SENSOR TURE SENSOR To Remove Warming Drawer 1 Open the drawer to the fully opened position 2 Locate glide lever on each side of drawer push down on the left glide lever and pull up on the right glide lever 3 Pull the warming drawer away from the range Lever Push down with finger Lever Push up with finger CAUTION Turn power OFF before r...

Page 31: ...Push the hinge locks up against the front frame of the oven cavity to 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 ...

Page 32: ...cket and the handle can be detached from the door cover assembly REASEMBLY NOTE When you reinstall the insulation around the oven door glass make sure that the insulation is not visible in the glass after the door is reassembled Handle screws Door bracket Door Cover assembly 3 bottom liner screws Bracket WARNING DISCONNECT power supply cord from the outlet before servicing Replace all panels and p...

Page 33: ...move the oven door from the range See the page 3 17 for the procedure 2 Place the oven door on a padded work surface with the front glass facing down 3 Remove 4 screws 4 Turn the door over Remove 3 screws from the door cover assembly and detach the bracket 5 Lift the door cover assembly out and put it down WARNING DISCONNECT power supply cord from the outlet before servicing Replace all panels and...

Page 34: ... gasket Door gasket Door gasket Door gasket Door gasket Door gasket Door gasket Door gasket Door gasket Door gasket Door gasket Door gasket Door gasket Door gasket Door gasket Gasket clip Gasket clip Gasket clip Gasket clip Gasket clip Gasket clip Gasket clip Gasket clip Gasket clip Gasket clip Gasket clip Gasket clip Gasket clip Gasket clip Gasket clip Gasket clip Gasket clip Gasket clip Gasket c...

Page 35: ...he unit 4 Remove the lamp controller and back cover See the page 3 2 5 Raise the cooktop assembly See the page 3 6 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 RECONNECT all grounding devices Failur...

Page 36: ...o connectors far enough 3 Resistance checks must be made with power cord unplugged from outlet and with wiring harness or connectors disconnected NOTE Below Ω value were tested at room temperature 77F 25 C 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 gr...

Page 37: ... the resistance after cooling down Multiple meter scale R x 1000 Normal Approximately 1 09 kΩ 10 If not replace Components Test procedures Results Normal Infinite Normal Approximately 2 6 kΩ 10 If not replace Abnormal Infinite open below 5Ω shorted NOTE The Micro switch will be held for 13 seconds during lock or unlock ON position Unlock position OFF position Lock position NOTE Ω Value was tested ...

Page 38: ...nuity Infinite 1 Refer to page 3 7 for the servicing procedure 2 Measure the resistance after cooling down Multiple meter scale R x 1 Normal Below 5 Ω If not replace 1 Remove wire leads 2 Measure resistance after cooling down Normal Approximately 50Ω Abnomal Infinite opened NOTE Ω Value was tested at room temperature 77F 25 C Be careful the element is sensitive to temperature ...

Page 39: ...proximately 16 5Ω Abnomal Infinite opened 1 Remove wire leads 2 Measure resistance after cooling down Normal Approximately 82Ω Abnomal Infinite opened NOTE Ω Value was tested at room temperature 77F 25 C Be careful the element is sensitive to temperature NOTE Ω Value was tested at room temperature 77F 25 C Be careful the element is sensitive to temperature NOTE Ω Value was tested at room temperatu...

Page 40: ...ent terminal and 1A The meter should indicate 46 Ω 10 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 continuity 0Ω Components Test procedures Results Normal Approximately 46 Ω If not replace Below 150 F open circuit infinite Above 150 F cont...

Page 41: ...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 continuity 0 Ω 4 6 Dual surface unit Left Front LF Right Front RF Element Components Test procedures Results Normal Approximately 41 Ω Normal Approximately 32 Ω Below 150 F open circuit infinite...

Page 42: ...erminal Element terminal Element terminal Element terminal Element terminal Element terminal Element terminal Element terminal Element terminal Element terminal Element terminal Element terminal Element terminal Element terminal Element terminal Element terminal Element terminal Element terminal Element terminal Element terminal Element terminal Element terminal Element terminal Element terminal E...

Page 43: ...ox 47 LR 1200W approx 47 RF 1400W Inner approx 41 1800W Outer approx 32 WARM ZONE 100W approx 570 LF 1400W Inner approx 41 1800W Outer approx 32 WIRE COLORS TABLE 1 SYMBOL COLOR WH WHITE BK BLACK RD RED YL YELLOW PK PINK BL BLUE BR BROWN GN GREEN GY GRAY OR ORANGE VI VIOLET For Model LRE3085ST 00 ...

Page 44: ... 47Ω LR 1200W approx 47Ω RF 1400W Inner approx 41Ω 1800W Outer approx 32Ω WARM ZONE 100W approx 570Ω LF 1400W Inner approx 41Ω 1800W Outer approx 32Ω WIRE COLORS TABLE 1 SYMBOL COLOR WH WHITE BK BLACK RD RED YL YELLOW PK PINK BL BLUE BR BROWN GN GREEN GY GRAY OR ORANGE VI VIOLET For Model LRE3085ST 01 ...

Page 45: ...5 3 COMPOSITION OF CONTROL Key Matrix Key Matrix ...

Page 46: ...5 4 COMPOSITION OF CONTROL Main PCB Loc No 2006 Cook top display PCB Loc No 2031 Key Pad Oven Relay PCB Loc No 5070 Front Back Controller assembly ...

Page 47: ...5 5 COMPOSITION OF CONTROL Main PCB Main PCB P N EBR77562701 Oven Relay PCB Oven Relay PCB CN30 CN22 CN21 CN24 CN11 CN13 CN09 CN17 CN16 CN25 CN03 CN26 CN32 CN1 CN103 CN102 CN17 CN16 CN101 CN100 ...

Page 48: ...5 6 COMPOSITION OF CONTROL Cook top display PCB Cook top display PCB Key Pad Key Pad ...

Page 49: ...ow these steps 1 press the CLEAR button 2 press the BAKE BROIL button at the same time 3 press the BAKE BROIL button at the same time again 4 press the NUM 0 button Only software version is displayed at the left digits 5 Press the START button Model Option Software version ...

Page 50: ...y is sequential operation as below Relay Operation Sequence LR RY13 RR RY12 CR RY11 LF1 RY17 LF2 RY16 RF1 RY15 RF2 RY14 DLB_L RY110 DLB_R RY111 BR_O RY108 BR_In RY109 Conv RY107 DLB1 RY106 Bake RY104 Drawer RY103 DLB2 RY105 O L RY100 Motor RY101 Fan RY102 Relay s Loc No Y13 RY13 Y11 RY11 Y12 RY12 Active Load name ...

Page 51: ... 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 If the oven do not has any failure the Oven will show it like FIG 2 NOTE After checking the F code press the CLEAR button to remove all codes 7 1 CHECK THE FAILURE CODE FIG 1 FIG 2 Type of F Code Time of the failure occu...

Page 52: ...ing 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 during preheating In case of Door Lock Failure during operating Lock motor 1 Wiring 2 Oven Sensor 1 Wiring 2 Oven Sensor 1 Wiring 2 KeyP...

Page 53: ... resistance Symptom Oven hot F6 Check All heater relays are open shorted Symptom no heating F9 Check All heater relays and DLB relay are open Symptom Door lock fail F10 Check relative part Symptom Sensor error or no heating F1 F2 F9 Check Sensor resistance For Model LRE3085ST 00 ...

Page 54: ...resistance Symptom Oven hot F6 Check All heater relays are open shorted Symptom no heating F9 Check All heater relays and DLB relay are open t Symptom Door lock fail F10 Check relative part Symptom Sensor error or no heating F1 F2 F9 Check Sensor resistance For Model LRE3085ST 01 ...

Page 55: ...9 1 CHECKING FLOW CHART BY FAILURE Symptom Check Point 1 Power Failure Dead 2 No Display 1 Check Electric Wiring 2 Check the Main PCB Input Voltage with CN1 CN1 ...

Page 56: ...he voltage 120V Yes No Yes Plug the unit Power Failed Dead No display Check the button beep Touch the Clear button Can hear the beep sound Change the Main PCB No Go to No 4 1 2 Is the connector connected to Main PCB disconnected or disassembled CN1 No Unplugged the unit Yes Reconnect or adjust the connection 3 CN1 CN1 ...

Page 57: ...easure the resistance Power cord and CN01 s connection Normal continuity Abnormal infinite Code L1 to Pin1 of CN01 RD Code N to Pin3 of CN01 WH Yes No Replace the defective harness L1 L1 RD color is L1 White color is N L2 GND N N 4 Normal Abnormal Replace the Main PCB ...

Page 58: ...RE Symptom Check Point 1 No heating 2 F9 1 Check Electric Wiring 2 Check Heater s Resistance 3 Check the Sensor CN103 CN102 CN100 CN101 ⓐ ⓐ Resistance Ω CN103 2nd pin ⓐ ⓐ 50 CN102 1st pin ⓐ ⓐ 10 CN102 2nd pin ⓐ ⓐ 82 ⓐ ⓐ 1 2 1 2 1 1 2 ...

Page 59: ... 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 CN103 CN102 CN100 CN101 ⓐ ⓐ Resistance Ω CN101 2nd pin ⓐ ⓐ 14 5 ⓐ ⓐ 1 2 1 1 1 2 2 ...

Page 60: ...9 6 CHECKING FLOW CHART BY FAILURE CN13 Symptom Check Point 1 No heating 2 F9 1 Check Electric Wiring 2 Check Heater s Resistance 3 Check the Sensor Resistance Ω CN13 1st 2nd pin 1 09K 1 ...

Page 61: ...ay PCB All taps 3 Electric wiring of electric element Yes Reconnect or adjust the connection 1 CN16 CN17 CN16 Broil Inner Broil outer Convection Bake All taps Unplugged the unit Is the connection of heater normal Measure the resistance of each heater The resistance is shown below No Replace the defected heater 2 Broil outer Broil Inner Bake Convection yes CN17 No ...

Page 62: ...ress the NUM 3 button Normal Themistor value at room temp is from 70 F to 90 F as the above figure Yes Go to No 6 4 No Range Of the resistance Plug the unit Is the resistance of thermistor normal Check Pins 1and 2 of CN13 in main PCB Normal approximately 1 09kΩ at 25 C No Replace the defected Themistor 5 Yes Unplugged the unit CN13 6 Replace the Relay PCB If the unit does NOT work even though the ...

Page 63: ...BY FAILURE Symptom Check Point 1 Cook top No heating 1 Check Electric Wiring 2 Check the Resistance of each Heater a b c d CN21 CN22 CN23 1 2 1 2 1 2 Connector ⓐ ⓑ ⓒ ⓓ Location Resistance Ω CR ⓐ ⓒ 57 RR CN21 ⓓ 47 LR CN21 ⓒ 47 ...

Page 64: ... Check Point 1 Cook top No heating 1 Check Electric Wiring 2 Check the Resistance of each Heater b c d CN21 CN22 CN23 1 2 1 2 1 2 Connector ⓐ Location Resistance Ω LF 6 CN22 ⓒ 41 LF 9 CN22 ⓒ 32 RF 6 CN24 ⓓ 41 RF 9 CN24 ⓓ 32 L2 L1 CN21 Connector ...

Page 65: ...ctor disconnected loose 1 Electric wiring All taps of Main PCB No Reconnect or adjust the connection 1 Unplugged the unit All Taps Measure the resistance of each heater The resistance is shown Next page No Replace the defected heater 2 Right rear Left rear Warm zone No ...

Page 66: ...t Front Inner Right Front Inner Range Of the resistance Right Front Outer yes Heater Resistance Ω Approximately Right rear 47 Left rear 47 Right front inner 41 Right Front Outer 32 Left Front Inner 41 Left Front Outer 32 Center Rear 570 Replace the Main PCB ...

Page 67: ...KING FLOW CHART BY FAILURE Symptom Check Point 1 Door Lock System Failure 2 F10 1 Check the Electric wiring 2 Check the Motor s Resistance 3 Check the Relay PCB Door Lock Relay CN13 1 2 4 5 6 Resistance Ω CN 13 ...

Page 68: ...CHECKING FLOW CHART BY FAILURE Symptom Check Point 1 Door Lock System Failure 2 F10 1 Check the Electric wiring 2 Check the Motor s Resistance 3 Check the Relay PCB Door Lock Relay Resistance Ω ⓐ ⓑ 2 6K b a ...

Page 69: ...10 Is the Connector disconnected or loose Check the below 1 Between Main PCB and Relay PCB CN16 CN17 2 Electric wiring of relay PCB CN100 3 Electric wiring of Locking Motor and Micro Switch 4 Electric wiring of CN13 of Main PCB Yes Reconnect or adjust the connection 2 CN100 CN13 Unplugged the unit No Check the operation of door lock motor Press Start button for 3 seconds and try to open the door I...

Page 70: ...tch normal measure the resistance of door lock switch normally open type No Replace the micro switch 3 Yes Normal Abnormal Is the resistance of the lock motor normal measure the resistance of lock motor Normal approximately 2 6kΩ Abnormal infinite or below 5 Ω No Replace the lock motor 4 Yes ...

Page 71: ...17 CHECKING FLOW CHART BY FAILURE Symptom Check Point 1 Sensing Fail 2 F1 3 F2 1 Check the Electric Wiring 2 Check the Test Mode 3 Check the Sensor s Resistance CN13 1 Resistance Ω CN13 1st 2nd pin 1 09K ...

Page 72: ...ng in main PCB Normal approximately 1 09kΩ at 25 C No Replace the defected thermistor 2 CN13 Is the value of thermistor normal Check with the test mode To enter the test mode follow these steps 1 press the clear key 2 press the BAKE BROIL button at the same time 3 press the BAKE BROIL button at the same time again Software version is displayed at the left digits 4 press the NUM 3 button Normal the...

Page 73: ... FAILURE Symptom Check Point 1 Oven hot 2 F6 1 Check the Resistance of the Relay 2 Check the Sensor s Resistance Relay Short check CN103 CN102 CN100 CN101 ⓐ ⓐ ⓐ ⓐ 1 2 1 1 2 Location Resistance Ω CN103 CN103 CN102 CN103 CN102 2 1 ...

Page 74: ...ART BY FAILURE Symptom Check Point 1 Oven hot 2 F6 1 Check the Resistance of the Relay 2 Check the Sensor s Resistance Relay Short check CN103 CN102 CN100 CN101 ⓐ ⓐ ⓐ ⓐ 1 2 1 1 2 Location Resistance Ω CN101 CN101 CN100 1 2 ...

Page 75: ...9 21 CHECKING FLOW CHART BY FAILURE Symptom Check Point 1 Oven hot 2 F6 1 Check the Resistance of the Relay 2 Check the Sensor s Resistance CN13 1 Resistance Ω CN13 1st 2nd pin 1 09K ...

Page 76: ... of heater relay and L Normal infinite Abnormal shorted No Replace the relay PCB 2 CN103 1st pin and CN102 1st pin Yes Yes Is the DLB relay normal Measure the resistance Normal infinite Abnormal continuity No Replace the relay PCB 3 Normal Abnormal Broil RY108 Relay Resistance Broil RY109 Relay Resistance Normal Abnormal CN103 1st pin and 2nd pin CN103 1st pin and CN102 2nd pin ConV RY107 Relay Re...

Page 77: ...de follow these steps 1 press the clear key 2 press the BAKE BROIL button at the same time 3 press the BAKE BROIL button at the same time again Software version is displayed at the left digits 4 press the NUM 3 button Normal the sensor value is from 70 F to 90 F at room temp No Replace the Main PCB 4 Plug the unit ...

Page 78: ...9 24 CHECKING FLOW CHART BY FAILURE Symptom Check Point 1 Keypad Failure 2 F3 Error 1 Check the Door Locking System 2 Check the Electric Wiring CN03 ...

Page 79: ... Replace the Key pad And then check button operation using key test mode To enter the test mode below steps 1 press the Clear button 2 press the BAKE BROIL button at the same time 3 press the BAKE BROIL button at the same time again Software version is displayed at the left digits 4 press the NUM 7 button 5 Check the button Refer to the next page appendix 2 3 Plug the unit If button is not operate...

Page 80: ...sound when key is accessed 2 If the key access order was changed the buzzer make double beep sound 3 The buzzer does NOT beep when a key was accessed it would be defected How to stop Key Test mode Press 1st 2nd 29th CLEAR Press CLEAR button one more Key operation T Key operation Test sequence est sequence First Last 29th ...

Page 81: ...e 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 replace broken wires Test and or replace main PCB Test and or replace element Line voltage shou...

Page 82: ... period after self clean cycle not complete 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 Test and ...

Page 83: ...lly controlled 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 Do not use harsh abrasives or scouring pads See Owner s manual intructions 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...

Page 84: ...LIANCE RADIANT COOK TOP Wattage Ω RR 1200W approx 47Ω LR 1200W approx 47Ω RF 1400W Inner approx 41Ω 1800W Outer approx 32Ω WARM ZONE 100W approx 570Ω LF 1400W Inner approx 41Ω 1800W Outer approx 32Ω WIRE COLORS TABLE 1 SYMBOL COLOR WH WHITE BK BLACK RD RED YL YELLOW PK PINK BL BLUE BR BROWN GN GREEN GY GRAY OR ORANGE VI VIOLET SCHEMATIC DIAGRAM For Model LRE3085ST 00 ...

Page 85: ...ox 47Ω RF 1400W Inner approx 41Ω 1800W Outer approx 32Ω WARM ZONE 100W approx 570Ω LF 1400W Inner approx 41Ω 1800W Outer approx 32Ω WIRE COLORS TABLE 1 SYMBOL COLOR WH WHITE BK BLACK RD RED YL YELLOW PK PINK BL BLUE BR BROWN GN GREEN GY GRAY OR ORANGE VI VIOLET NOTE Schematic diagram shows oven door opened and unlocked All elements are set to OFF SCHEMATIC DIAGRAM For Model LRE3085ST 01 ...

Page 86: ... 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 BAKE COOK WARM PROOF OVEN LIGHT CLOCK DISPLAY ON EASY CLEAN ...

Page 87: ...12 4 BROIL WARMNING DRAWER CONV BAKE CONV ROAST SELF CLEANING ...

Page 88: ...RR Cook top Element LR Cook top Element CR Warming Zone 12 5 ...

Page 89: ...12 6 LF Cook top Element RF Cook top Element ...

Page 90: ... 13 1 EXPLODED VIEW EV INTRODUCTION DOOR PARTS DRAWER PARTS COOKTOP PARTS CONTROLLER PARTS CAVITY PARTS Customer Model Product Code SVC Model MODEL ...

Page 91: ... 13 2 EV DOOR PARTS 1023 1801 1733 1000 W225 1734 1704 1025 1703 1018 1020 1009 1735 1021 1045 1024 1024 1026 W225 W222 W101 W101 1703 W222 W222 W222 ...

Page 92: ... 13 3 EV CONTROLLER PARTS I 2031 2050 2006 2048 2037 2042 2036 3006 2034 2041 2381 Customer Model Product Code SVC Model MODEL ...

Page 93: ... 13 5 COOKTOP PARTS 3057 3014 3056 3302 3302 3303 3303 3401 3022 3204 3207 3401 3204 3204 3204 EV ...

Page 94: ... 13 6 DRAWER PARTS 8523 8517 8021 8505 8524 8512 8602 8520 8501 8504 8508 8514 W228 8513 8513 8388 8519 8509 5505 8708 8708 5505 8502 8507 8522 EV ...

Page 95: ...30 W230 W301 5557 5513 5951 W233 5507 5521 W232 5407 5700 5505 5505 W230 W225 W225 5516 5512 5512 5515 5132 5401 5410 5517 5037 5506 3205 5509 5502 5016 5067 3093 3109 5510 5070 5409 5508 3063 3013 5539 5012 5503 5511 5539 5063 8511 W229 9381 5019 5032 5532 5533 5514 EV Customer Model Product Code SVC Model MODEL ...

Page 96: ......

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LG LRE3085ST, Service Manual

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