lwd3081_trainingmanual

7/22/2019 LWD3081_TrainingManual

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LG TRAINING MANUAL

Spring 2009 Oven Training

LG TRAINING MANUAL

LWD3081ST


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LWD3081ST TRAINING MANUAL

LWD3081ST Page 1 TRAINING MANUAL

IMPORTANT SAFETY NOTICEThe information in this training manual is intended for use by persons possessing an adequate background in electricalequipment, electronic devices, and mechanical systems. In any attempt to repair a major appliance, personal injury andproperty damage can result. The manufacturer or seller maintains no liability for the interpretation of this information,nor can it assume any liability in conjunction with its use. When servicing this product, under no circumstances should

the original design be modified or altered without permission from LG Electronics. Unauthorized modifications will notonly void the warranty, but may lead to property damage or user injury. If wires, screws, clips, straps, nuts, or washersused to complete a ground path are removed for service, they must be returned to their original positions and properlyfastened.

CAUTIONTo avoid personal injury, disconnect the power before servicing this product. If electrical power is required fordiagnosis or test purposes, disconnect the power immediately after performing the necessary checks. Also be awarethat many household appliances present a weight hazard. At least two people should be involved in the installation orservicing of such devices. Failure to consider the weight of an appliance could result in physical injury.

ESD NOTICESome of the electronics in appliances are electrostatic discharge (ESD) sensitive. ESD can weaken or damage theelectronics in these appliances in a manner that renders them inoperative or reduces the time until their next failure.Connect an ESD wrist strap to a ground connection point or unpainted metal in the appliance. Alternatively, you cantouch your finger repeatedly to a ground connection point or unpainted metal in the appliance. Before removing areplacement part from its package, touch the anti-static bag to a ground connection point or unpainted metal in theappliance. Handle the electronic control assembly by its edges only. When repackaging a failed electronic controlassembly in an anti-static bag, observe these same precautions.

REGULATORY INFORMATIONThis equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 ofthe FCC Rules. These limits are designed to provide reasonable protection against harmful interference when theequipment is operated in a residential installation. This equipment generates, uses, and can radiate radio frequencyenergy, and, if not installed and used in accordance with the instruction manual, may cause harmful interference to

radio communications. However, there is no guarantee that interference will not occur in a particular installation. If thisequipment does cause harmful interference to radio or television reception, which can be determined by turning theequipment off and on, the user is encouraged to try to correct the interference by one or more of the followingmeasures: Reorient or relocate the receiving antenna; Increase the separation between the equipment and the receiver;Connect the equipment to an outlet on a different circuit than that to which the receiver is connected; or consult thedealer or an experienced radio/TV technician for help.

DISCLAIMERThe information in this training manual was accurate at the time of publication. Every effort has been made to ensureaccuracy. Updates, changes, etc. are available via GCSC and LGCSacademy. The information in this manual is intendedfor persons with adequate backgrounds in electronics, mechanical, and electronic servicing. The manufacturer andseller are not to be held responsible for any liability incurred from its use.

COMPLIANCEThe responsible party for this devices compliance is LG Electronics Alabama, Inc.; 201 James Record Road, Huntsville,AL, 35813.


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WALL OVEN TRAINING MANUAL


LWD3081ST (Double Wall Oven)The Small Print Page 1Contents 2Introduction 4Special Warnings and Information 5Specifications 6Warranty 7Controls 8Component Location Chart 10Replacing the Control Panel and Related Parts 11

Controller LVT (Low Voltage Transformer) 12Relay PCB 13Door Locking Mechanism 14Manual Unlocking Procedure 15

Halogen Lamp LVT (Low Voltage Transformer) Replacement 15Surge Filter 16Replacing Oven Cavity Components 17

Broil Element 17Convection Element 18Convection Fan Blade 18Halogen Lamps 19Oven Sensor 19

Replacing Other Electrical Components 20Vent (Cooling Fan Blower) Motors 21Thermal Limiters 21

Door Switch 22Upper Oven Repair 23Back Cover 24Convection Fan Motor 25Hidden Bake Element 26Lower Oven Repair 28Oven Doors 30Repairing the Oven Door Handle and Glass 31Replacing the Door Gasket 33Component Tests 34

Convection Fan Motor 34

Door Locking Motor 34Door Locking Microswitch 35Low Voltage Transformer (Controller) 35Low Voltage Transformer (Halogen Lamps) 35Oven Thermistor 36Door Switch 36Halogen Lamps 36


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LWD3081ST (Double Wall Oven), continuedComponent Tests (continued)

Broil Element 37Bake Element 37

Convection Element 37Vent Motor 38

Test Mode 39Error Codes (F-Codes) 40Diagnostic Flow Charts 41

Dead Oven 41Oven Does Not Heat (F-9 or F-19 Error Codes) 46Control Panel Failure (F-3 Error Code) 50Lock System Failure (F-10 and F-20 Error Codes) 51Oven Thermistor Failure (F-1, F-2, F-4, and F-5 Error Codes) 53Oven Too Hot (F-6 and F-16 Error Codes) 54

Communication Error (F-10 Error Code) 55Schematic 56Strip Circuits 57

Full Broil Mode 57Center Broil Mode 58Crisp Convection Mode 59Convection Bake and Convection Roast Modes 60Bake and Roast Modes 61Self Clean Mode 62Warm and Proof Modes 63

Serial Number Information 64

Exploded Views 65Component Parts (Controller, door, oven cavity) 65Controller 66Doors 66Upper Oven 67Lower Oven 68Racks, Trim, and Covers 69

Parts List 70Supplementary Information 74

Ver. 1.3 090213


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INTRODUCTIONThe LWD3081ST built-in double wall oven, and its smaller sibling, the single oven, areLGs recent entries in the appliance arena. The double oven is actually two single ovensbolted together, with the chief difference being that the lower oven does not have the

accessory probe socket or the healthy roast feature.

The model and serial numbers are on the ID sticker mounted under the control panel.Open the door (top door on double ovens) and look under the panel to see it.

The tech sheet is located inside the control panel area. Pull the oven out of its cabinetryslightly and take the cover off the control area.

WARNING! ELECTRIC SHOCK HAZARDThe oven must be disconnected from the power supply while repairs,replacements, and adjustments are carried out. Failure to do so can resultin electric shock or death by electrocution.

WARNING! CUT HAZARDUse extreme caution when handling the metal parts of the oven. Theedges can be extremely sharp. Wearing service gloves is recommended.


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SPECIAL WARNINGS and INFORMATIONDo not put aluminum foil where it touchesthe sides, back, or bottom of the oven. Itwill melt and destroy the finish of the oven.

This damage is not repairable.

The metal trim piece must be installedcorrectly at the bottom of the oven. Thistrim piece deflects the cooling air flow andmust be in place.

The convection fan is in the back of theoven. It circulates the hot air in the ovenfor faster and more even cooking.

All functions are available via the touchpadmenus.

The menus are displayed in the window ofthe control panel and change as necessary.


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SPECIFICATIONS


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WARRANTY

This warranty sheet is provided for instructional purposes only. Warranties vary fromtime to time, model to model, year to year, and country to country. Refer to thewarranty certificate that was provided with your customers product for accuratewarranty coverage information.


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CONTROLSThe full operating instructions are included in the owners manual. This section isdesigned to provide enough information for the servicer to diagnose and repair anyissues with the oven.

The control panel is a capacitance glass touch panel. There are no moving parts; the usermerely touches the panel at the option to be selected. Occasionally, people with poorcirculation or small, thin fingers may experience some difficulty making the panel sensetheir presence. If they use their thumbs, this issue is usually alleviated.

Read all instructions carefully before operating the oven.

In the event of a power failure, the clock will flash and a PF error code will show in thedisplay. Reset the time. If the oven was set for a timed operation when the power failureoccurred, the clock and all programmed functions must be reset.

1 Upper oven light Turns the upper oven lights on and off2 Lower oven light Turns the lower oven lights on and off3 Upper oven Activates the controls for the upper oven4 Lower oven Activates the controls for the lower oven5 Start Starts all oven features6 Timer (ON / OFF) Sets or cancels the timer7 Upper CLEAR / OFF Turns the upper oven OFF or cancels its setting8 Lower CLEAR / OFF Turns the lower oven OFF or cancels its setting9 Touch Screen Shows the time of day, menus, oven temperatures andcycles, timer, and automatic functions. This panel will gointo a sleep mode if there is no activity for 10 minutes. To

wake it, touch it and make your selections.

Continued on next page.


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9 Touch Screen Shows the time of day, menus, oven temperatures andcycles, timer, and automatic functions. This panel will gointo a sleep mode if there is no activity for 10 minutes. Towake it, touch it and make your selections.10 Bake Selects the normal bake mode11 Broil Selects the normal broil mode12 Roast Selects the normal roast mode13 Convection Bake Selects the convection bake mode14 Crisp Convection Selects the crisp convection mode15 Convection Roast Selects the convection roast mode16 Recipe Bank Contains 100 recipes designed especially for this oven17 Proof / Warm For proofing (raising) bread dough or keeping food warm18 Healthier Roast Selects the healthier roast mode19 My Menu Stores and recalls the customers ten favorite cookingsequences20 Set up Sets and changes special settings, including time andtemperature adjustments21 Self Clean Sets a self-cleaning cycle

ERROR CODESSee the error code chart on page 40. If there is an error code, ask the customer to makea note of the code before pressing CLEAR / OFF. Allow the oven to cool for at least anhour, and then try the cooking cycle again. If the error code repeats itself, have thecustomer disconnect the power and call for service.


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COMPONENT LOCATIONSThe drawing shows the relative positions of most parts considered to be serviceable.

For most repairs, the oven will NOT need to be removed from the cabinetry for service.As the double oven weighs over 250 pounds (157 kg), two people will needed forremoval and replacement. An alternative is to use an oven dolly. Additionally, cautionmust be exercised to avoid damaging the oven, the cabinetry, and the floor whenservicing the oven. Most service operations can be performed without removing the oven.

These will be listed in the service procedures contained within this manual.

WARNING! ELECTRIC SHOCK HAZARDThe oven must be disconnected from the power supply while repairs,replacements, and adjustments are carried out. Failure to do so can resultin electric shock or death by electrocution.


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REPLACING the CONTROL PANEL and RELATED COMPONENTSTurn off the electric power to the oven.

Open the upper oven door.

Remove three screws from the bottomedge of the control panel.

Close the upper oven door.

Lift the control panel off the guide hooksand top trim.

Tilt the control panel down.

It hinges in the slots on the main body ofthe oven and will hang there in the serviceposition.

Disconnect the 8 plastic connectors at themain board to allow removal of the controlpanel from the oven.

Connectors include CN 01, CN 02,

CN 03, CN 04, CN 05, CN 08, CN 11,and CN 12.

Remove the control panel and set it asideon a soft cloth to prevent damage andscratches.


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After the control panel is removed, theinterior of the parts area is visible.

The following parts can be removedwithout removing the oven from thecabinetry.

Controller LVT (Low Voltage Transformer),relay PCB, door lock motor, halogen lampLVT, and surge filter.

Controller LVT (Low Voltage Transformer)Remove the screw that secures thetransformer base to the bracket.

Remove the entire bracket and transformer

as a unit.


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RELAY PCBTo remove the relay PCB, remove thescrew that secures the board to the controlarea.

Slide the board out from the control area.

Disconnect all thirteen plastic connectorsfrom the relay board. Connectors include

CN 01, CN 02, CN 03, CN 04, BL, YL,WH, VI, VI (again), RD, YL, RY 19, andRY 20.


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DOOR LOCKING MECHANISMThe door lock assembly is mounted on thetop of each oven. It activates during a self-clean cycle and will not open again until

the internal oven temperature drops below500 F (260 C).

To remove the door lock assembly, openthe oven door.

Remove the two screws that secure thelock assembly to the oven front.Lift the door lock motor out and unplugthe electrical connector.

If replacing the lower oven door lock, youmust separate the ovens to allow access.

A cam on the lock motor operates amicroswitch attached to the lockmechanism which reports its position tothe main board.

The main board will not allow the self-cleancycle to operate unless the lock is engaged.


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MANUAL UNLOCK PROCEDUREIf necessary, the door lock is spring-loadedand can be released manually.

Use an L-shaped object, like an Allenwrench. Reach between the door and thecontrol panel. Grasp the hook on themotor and pull it toward the left.

When the hook is pulled aside, you canopen the oven door. While this conditionpersists, consider the oven out of serviceand do not attempt to cook in it.

Refer to pages 14 and 51 for the

procedure to test and replace the lockmotor mechanism. An alternate method isto disconnect the unlock motor from theoven wiring and apply 120 VAC to it. If themotor will operate, allow it to rotate to theunlock position. This will also let you knowthe motor is good and to look at the wiringand the main control board.

HALOGEN LAMP LOW VOLTAGE TRANSFORMER (LVT) REPLACEMENTDisconnect the 5 connectors on the lamptransformer. It may be easier to remove thetransformer before separating theconnectors.

Remove the screw that secures thetransformer base to the bracket.

Remove the entire bracket and transformeras a unit. The back end of the transformer

slides into brackets stamped into the base.

Pay attention to the sticker on the top ofthe transformer. It shows which wires areconnected to which terminals. A mistakehere will destroy the transformer and thecontrol boards.


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SURGE FILTER REPLACEMENTTo replace the surge filter, remove it fromthe oven.

Remove one screw that attaches thebracket and filter to the back of the controlarea.

Remove the screw and ground wire.

Be sure to pull the bracket out toward theleft to clear the bracket at the top rightcorner.

Disconnect the two leads and remove theboard from the oven.


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REPLACING OVEN CAVITY COMPONENTSWARNING! Disconnect the power beforeworking on the oven.

WARNING! Many of the metal panels havesharp edges. We recommend wearingassembly gloves for safety.

The broil element, convection element,convection fan blade, oven thermistor, andhalogen lamps can be serviced withoutdisassembling the oven.

BROIL ELEMENTRemove the four screws from the front andrear brackets.

(Two on the rear bracket; one on each ofthe two front brackets.)

Pull the element forward to access the

terminals and disconnect the wires. Becareful to avoid damaging the wires on theedges when you pull them through thehole.

Some terminals may be equipped with arelease tab which must be pressed torelease the connector.


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CONVECTION ELEMENTRemove the four screws that secure theconvection fan cover. (This cover takes upmost of the back of the oven cavity.)

Take the cover out of the oven cavity.

WARNING! Be careful to avoid bending ordamaging the fan blade.

Remove the four screws that secure theconvection element.

The element is fragile. Handle it carefully toavoid damage or breakage.

Pull the element forward into the ovencavity. Be careful to avoid damaging thewires on the edges when you pull them

through the hole.

Some terminals may be equipped with arelease tab which must be pressed torelease the connector.

CONVECTION FAN BLADERemove the nut securing the fan blade.(It is a left-hand thread.)

Pull the fan blade off the shaft. Do not losethe bushing (spacer) or washer.

Be careful to avoid bending the fan blade.


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HALOGEN LAMPSThere are three halogen lamps in the oven.(Three in each oven for the double oven.)

Insert a small, flat blade screwdriver intothe guide hole and gently pull the coveroff.

Be careful to avoid breaking the glass orchipping the paint.

Do not touch the bulb with bare fingers,Use a clean cloth or paper towel to handlethe bulb. (Unlike the photo.)

Pull the bulb out of its socket. Whenreplacing it, be careful to avoid bending theleads.

To replace the socket, you will need toremove the side of the oven.

OVEN SENSORRemove the two screws securing the sensorbracket to the back of the oven.

Pull the sensor forward into the ovencavity. Be careful to avoid damaging thewires on the edges when you pull themthrough the hole.


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REPLACING OTHER ELECTRICAL COMPONENTSWARNING! Electric shock hazard. The oven must be disconnected from the power

supply when making repairs and adjustments.

WARNING! Cut hazard. Many of the panels and sheet metal parts of the oven haveexceptionally sharp edges. Handle them with extreme caution. Werecommend wearing assembly gloves or some other type of safety handprotection.

WARNING! Weight hazard. The double oven weighs over 250 pounds. Use care whenlifting the oven. Do not allow it to fall from its cabinetry. We recommendusing at least two people to lift the oven. A special dolly is available toassist with removal and replacement of the oven.

In the following sections, it is necessary to remove the oven from its cabinetry.

Depending upon the components being serviced, various levels of disassembly will berequired. Use care, and be very careful of sharp edges.

To service the controls, remove the ovenfar enough to remove the control covers.Be careful the oven does not fall from itscabinetry, as it weighs over 250 pounds.It might be best to remove the ovencompletely and set it on the floor.

Remove the 13 screws that secure the

three sections of the top cover.

The vent motor, the thermal limiter for thecooling fan, and the door switch (top oven)can be serviced here.


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VENT (COOLING FAN BLOWER) MOTORSRemove the two screws that secure thevent motor to the control area base.

The lower vent fan can be serviced withoutseparating the ovens.

Unplug the connectors to the motor andremove it from the control area.

The cooling fans can operate at two speeds, based upon temperature. In self-clean mode,if the oven temperature is above 482 F (250 C), the fans will operate at high speed. Ifthe temperature is above 212 F (100 C) but below 482 F (250 C), the fans willoperate at low speed. In normal cooking mode, if either oven temperature reaches 212F (100 C), the cooling fans will operate at low speed.

THERMAL LIMITERSThe thermal limiters serve to shut offpower to the control power transformer.

They are secured by a tab and a screw.

Disconnect the leads and remove the screwsecuring the thermal limiter. Theconnectors may include a release tab thatmust be pressed to remove the lead.

The upper thermostat is in front of the upper cooling fan, secured to the base of thecontrol area by a tab and a screw. It opens at 356 F (180 C) and closes when theoven cools to 14 F (-10 C).

The lower thermostat is next to the lower ovens bake element. It opens at 320 F(160 C) and closes when the oven cools to 14 F (-10 C).


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DOOR SWITCHRemove the screw securing the top rightpanel of the oven. Be careful removing thepanel because of the sharp edges.

(Often, the switch can be removed fromthe front of the oven without anydisassembly. Pull it out slightly and pressthe retaining tabs with a small screwdriverto release them. Then pull the switch out.)

Squeeze the tabs on the switch and push itout through the front of the oven.

Disconnect the wires from the terminals.

The connectors may include a release tabthat must be pressed to remove the lead.

(Be sure the wires dont jump back inthrough the hole or disassembly will benecessary.)


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UPPER OVEN REPAIRThe thermal limiter, the convection fanmotor, and the hidden bake element can beserviced by removing the upper rear cover.

(See photo.) There are 14 screws securingthe upper cover.

WARNING! Cut hazard.Many of the panels and sheet metal partsof the oven have exceptionally sharp edges.Handle them with extreme caution. Werecommend wearing assembly gloves orsome other type of safety hand protection.

After removing all the screws, lift the backcover off the oven. (See photo, below.)

The upper and lower covers are identical,but we recommend replacing them in theiroriginal positions because the marks madeby the screws make it easer to replace all

the screws into the correct locations.

The serial number sticker is on the loweroven cover.

Close photo of the hanging tab of the backcover. (See above.)


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BACK COVERThe thermal limiter is attached to the backof the oven by two screws. It is wired inseries with the double line break relay.

The thermal limiter opens at 356 F(180 C) and closes at -31 F (-35 C).

To replace the thermal limiter, remove thewire leads. The connectors may include a

release tab that must be pressed to removethe lead.

Remove the screw that holds the limiter inplace.


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CONVECTION FAN MOTORRemove the four screws that secure theconvection fan cover. (This cover takes upmost of the back of the oven cavity.)

Take the cover out of the oven cavity.

It is not necessary to remove theconvection element at this time.

WARNING! Be careful to avoid bending ordamaging the fan blade.

Remove the nut securing the fan blade.(It is a left-hand thread.)

Pull the fan blade off the shaft. Do not losethe bushing (spacer) or washer.

Be careful to avoid bending the fan blade.

Disconnect the two wire leads from the fanmotor.


Remove the three screws that secure thefan motor to the oven body.


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HIDDEN BAKE ELEMENTTo service the upper hidden bake element,you must remove the back cover of theoven and the barrier bracket, as shown.

Disconnect the wire leads from the bakeelement.


Remove the cover of the upper hiddenbake element.

To remove the cover for the first time,youll need to cut the eight points of the

edge of the cover. We suggest filing orgrinding them off when the cover isremoved to reduce the possibility of aserious laceration injury in the future.

Fold the insulation material out of the wayand remove the screw securing the

element.


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HIDDEN BAKE ELEMENT, continuedPull the upper bake element straight out.

When replacing the upper bake elementcover, turn it over and use five screws tosecure it in place.

We suggest filing or grinding the points offor bending them back when the cover isremoved to reduce the possibility of aserious laceration injury in the future. Be

sure to take care of the points on the ovenas well as those on the cover for safety.


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LOWER OVEN REPAIRThe thermal limiter, the convection fanmotor, and the hidden bake element can beserviced by removing the lower rear cover.

(See photo.) There are 19 screws securingthe lower rear cover.

WARNING! Cut hazard.Many of the panels and sheet metal partsof the oven have exceptionally sharp edges.Handle them with extreme caution. Werecommend wearing assembly gloves orsome other type of safety hand protection.

Servicing the lower oven is very similar toservicing the upper oven because they areidentical ovens stacked atop one another.The only major differences are that the

lower oven will not accept a probe and theprobe receptacle is blocked.

To replace the thermal limiter, remove the

screw that secures it and lift it of the tab.


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LOWER OVEN REPAIR, CONTINUEDReplacing the door lock motor and thedoor switch in the lower oven is the sameas the upper oven, except the ovens must

be separated first.

Remove the mounting rails on both sides ofthe oven.

Notice that the rails are marked L and R forleft and right, and are not interchangeable.

Remove the screws and the middlesupports from both sides.

The top view of the oven shows the doorswitch, the vent motor, and the door lock

mechanism. The repair procedures are thesame as for the upper oven. The lower ventfan motor can be serviced withoutseparating the ovens.


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OVEN DOORSCAUTION! The doors are very heavy. Be very careful when removing or replacing the

doors. Do NOT lift or hold a door by its handle.Open the door all the way.

Lift the hinge lock up and away from theoven body to the unlocked position.

Do this on both sides of the door.

Close the door to the removal position,which is open very slightly, only about 5.

Grasp the door firmly by the sides and liftit out of the hinge slots until it is clear ofthe oven.

To replace the door, hold it at the same

angle as for removal and set the hinges intothe hinge slots.

Open the door all the way. If it will notopen all the way, it is not properly seated.

Fold the hinge lock back into place in thelocked position.

The door should open and close normally.


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REPAIRING THE OVEN DOOR HANDLE and GLASSRemove the oven door.

Place it face down on a padded work

surface.

Remove the four screws that secure theliner.

Remove the three screws along the bottomedge of the door.

Lift the inner liner of the door off the frontglass and set it aside.

Remove the two screws that secure thehandle.

Slide the door trim up and off the door.

Remove the hinge hanger screw, which ison each side of the door.

Lift the hinge hanger out of its place in thedoor.


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REPAIRING THE OVEN DOOR HANDLE and GLASS, continuedWith the door liner taken off, remove the 8screws that secure the inner cover.

Below the inner cover is another piece oftrim that helps secure the glass. Lift it outof the way. There are no screws; it was held

in place by the same screws that securedthe inner cover.

The inner and outer glasses are identical.Either glass can be replaced separately.The bracket holds both pieces of glass inplace.

Reassembly is the reverse of disassembly.


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REPLACING THE DOOR GASKETOpen the oven door.

Pull the gasket and its clips out of theholes along the sealing edge of the oven.

When reinstalling a new gasket, start at themiddle of the top and work around thedoor in both directions. When you get tothe ends, flatten them and stick them intothe small holes in the center of the bottom

of the opening. You might need to use apencil to poke them in.

Be very careful handling the gasketbecause it is delicate.


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COMPONENT TESTSWARNING! Disconnect the power before servicing the oven.WARNING! Replace all grounding devices and panels before operating the oven.Before testing any component, always check the connector. The most common cause offailure is corrosion on the connectors.

Use a VOM (Volt-Ohm Meter) or a DVM (Digital Volt Meter) with a range of at least20,000 ohms. All checks should be made with the power disconnected from the ovenand the component disconnected from its circuit.

CONVECTION FAN MOTORUnplug the convection fan from the circuit

and measure the resistance across theterminals.

Normal 17 10%

Replace if it is open or shorted.

DOOR LOCKING MOTORUnplug the lock motor from its circuit andmeasure the resistance across theterminals. (R x 1000)

Normal 2,550 10%

Replace if it is open or shorted.


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DOOR LOCKING MICROSWITCHDisconnect the switch from its circuit.Measure the resistance across theterminals of the switch. (R x 1000)

If the switch is good, the meter shouldshow continuity.

Press and hold the button on the switch.The meter should then show infiniteresistance.

After testing the switch, be sure toreconnect the leads properly.

LOW VOLTAGE TRANSFORMER (CONTROLLER)Remove the transformer from its circuit.(See page 12.)

Measure the resistance across theterminals as shown. (R x 1)

Normal 2610%

Replace if open or shorted.

LOW VOLTAGE TRANSFORMER (Halogen Lamps)Remove the transformer from its circuit.(See page 15.)

Measure the resistance across theterminals as shown. (R x 1)

Normal 9.810%



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OVEN THERMISTORRemove the sensor from the oven.(See page 19.)

Measure the resistance across the outerterminals, as shown, at 77 F (25 C).(R x 1000)

Normal 1090 10%


DOOR SWITCHRemove the switch from the oven.(See page 22.)

Measure the resistance across theterminals. (R x 1)

Plunger out should be continuity; plungerin should be infinite resistance.

HALOGEN LAMPSOften you can tell the bulb is bad bylooking at it. Check the continuity with anohmmeter if you have any doubt.


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BROIL ELEMENTDisconnect the leads from the element.

Measure the resistance across the

terminals at 77 F (25 C). (R x 1)

Outer 22.5 10%(outer yellow and blue terminals)

Inner 36.9 10%(inner yellow and pink terminals)


BAKE ELEMENTDisconnect the leads from the element.

Measure the resistance across theterminals at 77 F (25 C). (R x 1)

Normal 22.5 10%


CONVECTION ELEMENTDisconnect the leads from the element.Be very careful to avoid damaging the glasstube that encases the element.

Measure the resistance across theterminals at 77 F (25 C). (R x 1)

Normal 32.5 10%



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VENT MOTORDisconnect the leads from the element.

Measure the resistance across the

terminals at 77 F (25 C). (R x 1)

High ~ Common 16 10%

Low ~ Common 20 10%



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TEST MODETEST MODE allows you to run the oven through a self-check routine as well as allowingmanual entry into some of the test routines.

Disconnect the power from the oven for 7 seconds.

Reconnect power to the oven. Do NOT set the time. Press START, TIMER, UPPER LIGHT, and START in that order.

An alternate method allows you to enter the TEST mode without turning the power off.

Start at the Main Menu

Press SET-UP MENU, START, HIDDEN KEY 1, HIDDEN KEY 2, HIDDEN KEY 3,and START.

To cancel the TEST MODE, press UPPER CLEAR / OFF.


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ERROR CODESCode Description OperationF-1 Open sensor (upper) The upper oven thermistor remained open for

more than one minute after cooking started.

F-2 Shorted sensor (upper) The upper oven thermistor remained shorted formore than one minute after cooking started.F-3 Touch Sensor

Key ErrorKey error persisting for more than one minute.

F-4 Open sensor (lower) The lower oven thermistor remained open formore than one minute after cooking started.F-5 Shorted sensor (upper) The lower oven thermistor remained shorted formore than one minute after cooking started.F-6 Oven hot The upper oven is hotter than 650 F (343 C)for over two minutes while cooking.F-8 Temp Probe (upper) The temperature probe in the upper oven isshorted for over one minute after a cook cyclebegins.F-9 No heating (upper) The temperature in the upper oven has notachieved 150 F (66 C) within five minutes.F-10 Door lock fail (upper) The door lock on the upper oven failed to lock fora self-cleaning cycle.F-11 Comm error A communication error between the control paneland the main PCB persists for more than tenseconds.F-12 EEPROM error A fault in the EEPROM for MY MENU.

F-16 Oven hot (lower) The lower oven is hotter than 650 F (343 C)for over two minutes while cooking.F-19 No heating (lower) The temperature in the lower oven has notachieved 150 F (66 C) within five minutes.F-20 Door lock fail (lower) The door lock on the lower oven failed to lock fora self-cleaning cycle.


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DIAGNOSTIC FLOW CHARTSDEAD OVENNo power, no display.

Check the power to the wall oven at the fuse or breaker.

Check the thermostat.

Check the transformer.


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DEAD OVENNo Display.

POWER OFF

continued on next page


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DEAD OVEN, continued



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OVEN DOES NOT HEAT (F-9 or F-19 Error Code) Check the electric wiring and all PCB connectors.

Check the thermostats (thermistors). (See page 36.)

Check the elements. (See page 37.)

Check the thermal limiters. (See page 36.)



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OVEN DOES NOT HEAT (F-9 or F-19 Error Code), continued



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CONTROL PANEL FAILURE (Including F-3 Error Code)


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LOCK SYSTEM FAILURE (Including F-10 and F-20 Error Codes)When the self-cleaning cycle starts, the door lock motor rotates. If the door lock switchfails to detect a locked condition after cycling twice, the supervising circuit detects a lockfailure and the display will indicate the appropriate error code (F-10 or F-20.)



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LOCK SYSTEM FAILURE (Including F-10 and F-20 Error Codes), continued


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OVEN THERMISTOR FAILURE (Error Codes F-1, F-2, F-4, and F-5)


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OVEN TOO HOT (Error Codes F-6 and F-16)


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COMMUNICATION ERROR (F-10 Error Code)


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SCHEMATIC


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STRIP CIRCUITSStrip circuits are shown to assist in diagnosing and repairing the various components ofthe ovens.

Check the line voltage and fuse or circuit breaker first.

Check for loose or improper connections within the oven before beginning work.

The diagrams in the STRIP CIRCUIT section are drawn in the ON position.

UP indicates the upper oven; LO indicates the lower oven.

FULL BROIL MODE


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CENTER BROIL MODE


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CRISP CONVECTION MODE


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CONVECTION BAKE and CONVECTION ROAST MODES

In BAKE mode, the convection fan operates for only the PREHEAT portion of the cycle.


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BAKE and ROAST MODES


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SELF-CLEAN MODE



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SELF-CLEAN MODE, continued

WARM and PROOF MODES


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SERIAL NUMBER IDENTIFICATIONThe serial number is unique to each product. It gives information concerning the time andplace of manufacture. The serial number is required to be paid for warranty service andto get the correct part in the event a running production change was made. Some models

may have four (4) letters instead of two (2) for the product code number. The third andfourth letters are significant only to the manufacturing facility. This chart will help youdecode the serial number.

[Example] 801KW3400251

801 KW 00251

Production Number

[Internal code]

Manufactured January 2008

34

Made in Korea

Newer Style With Barcode

Sequential number

Internal code

Model IDProduction site (2 Letters)

12345 KR 406 YP 000002 + Options

New Serial Code (ETA Mid 2008)

Year and month of production (YMM)


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EXPLODED VIEWS


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EXPLODED VIEWS, continued


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PARTS LISTLoc # Part No Description

135501 MCK40417601 Cover, Inner135502 MCK47161201 Cover, Inner149801 MJH40418701 Supporter149802 MJH55321601 Supporter248101 MAZ47206702 Bracket, Control Panel248102 MAZ41753501 Bracket, Control Panel268711 EBR43296801 PCB Assembly, Main268712 EBR43296901 PCB Assembly, Display333901 3390W0N002B Tray, Metal (Broiler tray)333902 3390W0N001C Tray, Metal (Broiler pan)335501 MCK40423001 Cover, Top335502 MCK41754101 Cover, Top335503 MCK41753701 Cover, Top335504 MCK41754301 Cover, Top335505 MCK40423201 Cover, Top353001 MEE41716801 Heater, Sheath (Broil element ) (U & L)353002 MEE41716501 Heater, Sheath (Baker element (U & L)466001 6600R000082 Switch, Tactile (Oven lights) (U & L)539201 MFZ54382601 Packing, Gasket539202 MFZ40418401 Packing, Gasket547901 MAL48432601 Barrier

547902 MAL47168001 Barrier547903 MAL48432602 Barrier547904 MAL41753602 Barrier547905 MAL41753601 Barrier548101 MAZ47171401 Bracket, Idle (LVT and Light XFMR)548901 MKC51214901 Window, Glass (Side lights) (X 4) (U & L)548902 MKC51214801 Window, Glass (Top lights) (X2) (U & L)549801 MJH41754201 Supporter549802 4980W1A111B Supporter (Surge protector)549803 4980W1N013B Supporter

549804 MJH40420202 Supporter549805 MJH40420201 Supporter550121 MEV40416103 Insulator550122 MEV40416104 Insulator


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Loc # Part No Description561701 6170W1G037P Transformer, power (Low voltage, controls)561702 EBJ42409101 Transformer, power (Low voltage, lights)568711 EBR43297001 PCB Assembly, Sub

568771 EAD51438701 Harness, Single568772 EAD51439001 Harness, Single569131 EAQ43128701 Lamp, Halogen (Side lights) (X 4) (U & L)569132 EAQ43129201 Lamp, Halogen (Top lights) (X2) (U & L)569301 6930W1A003X Thermostat569302 EBG51439301 Thermostat569303 6930W1A003D Thermostat569304 EBG51439302 Thermostat

13213A ADV34868802 Frame Assembly, Door13551F ACQ56085401 Cover Assembly, Front

13581A ADC56000801 Door Assembly (X 2) (U & L)13650A MEB42058901 Handle, Door14775A AEH54055501 Hinge Assembly14810Q MAZ55266201 Bracket, Mount14890A 4890W1N005A Window, Glass (X 4) (U & L) (2 per door)15006P 5006841001A Cap, Protector23551A AGM67921301 Parts Assembly (Display and touch panel)23846A 3846W1N001A Name Plate (Logo)24781M ACM56000402 Controller Assembly, Keypad24980P MJH41753201 Supporter, PCB

33701A AHT54382601 Shelf Assembly (Telescopic rack)33808A MCK40420101 Cover, Rear34681R EAU43957801 Motor Assembly, AC, Synchronous (U & L)34810Q MAZ47162501 Bracket, Mount34918L MDX40418802 Grille (Connecting rail) (Left)34918R MDX40418602 Grille (Connecting rail) (Right)34930W 4B72510F Holder, Wire35026G MHL49207701 Shelf (Rack) (X 4) (U & L) (3 per oven)35301A AEG59306301 Heater Assembly (Convection element)36640B 6640000045A Connector, Terminal Block

50FZZA 3B74133K Fuse, Time Delay53446A MGJ40415002 Plate, Front53504A MBR40414102 Chamber (X 2) (U & L)53504B MBR40415301 Chamber53550H MCK54158201 Cover, Hole53550V MCK40416601 Cover, Vent


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Loc # Part No Description54072A 4W50028F Pin, Customized54350S 4B73725E Ring54681R 4681W1N002B Housing, Motor (X 4) (2 per motor)

54810H MAZ48427301 Bracket, Hinge (X 4) (2 per oven)54810R MAZ40417401 Bracket, Motor54980P MJH41754001 Supporter, PCB55012B MEV40415801 Insulator55012S MEV42726401 Insulator, Convection fan shaft spacer55012T MEV40415401 Insulator55209A ADJ52698701 Duct Assembly55232A MJZ41753801 Vent55233A AJV56083901 Vent Assembly55900C 5900W1N004B Fan, Convection

55901A 5901W1E002G Fan Assembly56201A EAM42043601 Filter Assembly (Surge protector)56322A 6322B62214A Thermistor, PTC56411A EAD42825101 Power Cord Assembly (Conduit)56500S EBD51431001 Sensor, Temperature (Probe)56620A EAG43128001 Jack, DC Power (Probe socket)56912H 6912W3H001F Lamp, Halogen63303A AGU56000301 Plate Assembly, BaseMAX171 MAX51230201 Book, CookMAY000 MAY41747201 Box

MFL409 MFL51224801 Manual, InstallationMFL552 MFL51224501 Manual, OwnersRY19 6920000025B Relay, Contact (Not shown)RY20 6920000025B Relay, Contact (Not shown)WAT001 1ATF0502610 Screw, TaptiteWNH201 1NHB0500032 Nut, Common (Convection fan, LH thread)WNZ022 1NZZW1N002B Nut, CustomizedWSZ003 1SBF0402618 Screw, TaptiteWSZ219 1SZZW5N001A Screw, CustomizedWSZ221 1SZZW1N006A Screw, Customized

WSZ242 1SZZW5N001J Screw, CustomizedWSZ246 1SZZW5N001D Screw, CustomizedWSZ247 1SZZW5N001F Screw, CustomizedWTC008 FAB30103101 Screw, TappingWTP002 1TPL0302018 Screw, Tapping


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Loc # Part No DescriptionWTP013 1TPL0402418 Screw, TappingWTT021 1TTL0402418 Screw, TappingWTP013 1TPL0402418 Screw, Tapping

WTT021 1TTL0402418 Screw, TappingWTT022 1TTL0402422 Screw, TappingWTT024 1TTL0402618 Screw, TappingWTT028 1TTL0402818 Screw, TappingWTT037 1TTL0403418 Screw, TappingWTT056 1TTL0403018 Screw, TappingWWZ081 1WZZW3Z003B Washer, CustomizedWWZ085 1WZZ81N001A Washer, Customized (Convection fan)


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OHMS LAW and WATTS LAWP = WATTSWatts = Volts2 / OhmsWatts = Amperes2 x Ohms

Watts = Volts x Amperes

I = AMPERESAmperes = Volts / OhmsAmperes = Watts / Volts

Amperes =

I R2

E /R2

P R

P/I

E I E/R

P/E

P/R

P/I2

E /P2

P

E/II R

I

E R

WATTS CURRENT

VOLTS OHMS

E = VOLTSVolts =Volts = Watts / AmperesVolts = Amperes x Ohms

R = OHMSOhms = Volts / Amperes

Ohms = Volts2 / WattsOhms = Watts / Amperes2

CONVERSION FORMULAEF = (9/5) C + 32 C = (5/9) x (F 32)


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SERVICE BULLETINS


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NOTES


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lwd3081_trainingmanual

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