EBR73304210 LG Refrigerator Main Control Board: Symptoms, Er Codes, Compatible Models and Install Guide
The EBR73304210 is the LG refrigerator main control board used on the LFX28978 and LFX28979 French door platform and on the LG-built Kenmore Elite 795.71 refrigerators that share the same cabinet. It reads the temperature sensors, decides when to cool, when to defrost and when to run each fan, and it is also the board that pushes fault codes out to the dispenser display. This guide covers what a failure looks like on this platform, how to read the Er codes the board reports, what to rule out before spending money, and the one detail on the board itself that decides whether a replacement actually fits.
What Are the Symptoms of a Failing EBR73304210 Main Control Board?
Commonly reported symptoms for an EBR73304210 include one compartment drifting warm while the other holds temperature, defrost that never completes and frost building on the rear freezer panel, fans that will not start or will not stop, a repeating Er code on the dispenser display, and a panel that accepts input but changes nothing in the cabinet.
Because this board sits between every sensor and every load on the cooling side, a fault rarely announces itself as one clean failure. What owners and technicians describe most often on this platform looks like a refrigerator that is partly working, which is exactly what makes it easy to misread.
- The fresh food section drifts warm while the freezer holds temperature, or the freezer warms while the fresh food side stays cold
- Frost builds steadily on the rear freezer panel until airflow drops off, which commonly points at a defrost cycle that is not completing
- An Er code appears on the dispenser display, clears on a power cycle, and returns within minutes or hours
- A communication code appears on the display while the cabinet keeps cooling normally, so the unit looks healthy from the front
- Fans do not start on a call for cooling, or run continuously and never cycle off
- The control panel accepts button presses and beeps, but nothing in the cabinet changes in response
- The refrigerator loses cooling entirely while lighting and the display stay live, so power to the cabinet is clearly present
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Where Is the Part Number on This LG Main Board, and Which Number Do You Order By?
The number to order by on an EBR73304210 is the EBR number on the label applied to the board, not the EAX number screened into the circuit board itself. Unplug the refrigerator, remove the rear access cover, and read the applied label before ordering any replacement main control board.
This short video shows how to find and read the label on an appliance control board and how to confirm the part before any packaging is opened. One extra step matters on this particular board. Assemblies in this family are built on a shared circuit board, so the number screened into the board is shared with neighbouring variants and will not tell you which one you are holding. Read the EBR number from the applied label instead. General installation guidance is included in the Quick Start Guide shipped with every order.
How Do You Tell a Board Fault From a Sensor or Fan Fault on This Platform?
Separating an EBR73304210 fault from a sensor or fan fault starts with what the display reports. Sensor and fan codes name the circuit they measured, so the part they name is checked first. Codes that describe the board talking to the display, or faults that persist after the named part tests good, are the ones that point back at the board.
Read the display first, then test the part the display names. The board is the answer when the named part measures correctly and the fault stays, or when the fault sits in a circuit only the board controls.
| Symptom | What It May Indicate | Recommended Next Step | Board? |
|---|---|---|---|
| Fresh food warm, freezer still cold | Airflow, damper operation or a temperature sensor input rather than the board itself | Compare the fresh food sensor resistance against the value table in your model's service documentation | Check sensor first |
| Frost building on the rear freezer panel | A defrost cycle that is not completing, which can be the heater, the defrost sensor, a fuse or the board's defrost control | Run a forced defrost per your model's instructions and watch whether the heater draws current | Check defrost parts |
| Communication code on the display, cabinet still cooling | The path between this board and the display board, which covers both boards and the harness between them | Reseat the harness at both ends before condemning either board | Board or display |
| Sensor code returns after a new sensor is fitted | The sensor input circuit on the board, once the replacement sensor measures correctly at the connector | Measure the new sensor at the board connector rather than at the sensor body | Points at board |
| Fan code with a fan that spins freely by hand | A fan feedback circuit, which covers the motor, its harness and the board input that reads it | Check the motor supply and feedback wiring before ordering a board | Check fan first |
| No cooling at all, display and lighting normal | The cooling control side, which can be the board, the compressor circuit or the sealed system | Confirm whether the compressor attempts to start before assuming a board fault | Possible |
| Display blank or unresponsive, cabinet still cooling | The display board or its supply rather than the main board | Check the display board and its harness first | Usually elsewhere |
| A two digit number shown during a service check | A test mode indication rather than a stored fault | Exit test mode and read the display again from a normal running state | Not an error |
What Do the Er Codes on This LG Platform Actually Report?
Er codes on this LG platform are pushed to the dispenser display by the main control board. Most name a sensor, a fan or a heater circuit, and those parts are checked first. A communication code names the link between the main board and the display board, which is the code most directly associated with this board.
The table below is a starting point for reading what the display is telling you on this platform, not a verdict. Code sets on LG refrigerators vary by model year and board revision, so confirm the exact reading in the service documentation for your own model before ordering anything.
| Display Code | What It May Indicate | Is It This Board? |
|---|---|---|
| Er CO | Communication between the main control board and the display board is not available. Commonly associated with either board or with the harness between them | Board or display |
| Er FS | Freezer temperature sensor circuit, covering the sensor, its wiring and the board input that reads it | Check sensor |
| Er rS | Refrigerator temperature sensor circuit on the fresh food side | Check sensor |
| Er dS | Defrost sensor circuit, commonly a short or an open in the sensor or its wiring | Check sensor |
| Er IS | Ice compartment sensor circuit | Check sensor |
| Er dH | Defrost heater circuit. Commonly associated with the heater, a thermal fuse or the wiring, and with the board only after those test good | Check heater first |
| Er FF | Freezer evaporator fan feedback, covering the fan motor, its harness and the board input | Check fan first |
| Er IF | Ice compartment fan feedback. Some displays render this in a way that reads as Er 1F | Check fan first |
| Er CF | Condenser fan feedback, in the machine compartment at the back of the cabinet | Check fan first |
| Er rt | Room temperature sensor circuit | Check sensor |
| Er SS | Pantry or deli drawer temperature sensor circuit | Check sensor |
| Er gF | Water flow measurement on the dispenser side, commonly associated with water pressure or the flow meter rather than cooling control | Usually elsewhere |
| Er It | Ice maker system self test, which is reported by the ice maker assembly rather than the cooling control | Usually elsewhere |
What Should You Rule Out Before Ordering an EBR73304210?
Before ordering an EBR73304210, rule out the temperature sensors, the defrost heater circuit and its sensor, the evaporator and condenser fan motors, the display board and the harness between it and the main board, and the sealed system. Each of these produces symptoms on this platform that are commonly read as a board failure.
Sensors are the single most common reason a refrigerator on this platform holds the wrong temperature or posts a sensor code. They are inexpensive, they fail as an open or a short rather than gracefully, and a bad reading makes the board behave exactly as though it were faulty.
Frost building on the rear freezer panel is one of the most common presentations on this cabinet, and it points at the defrost circuit long before it points at the board. A heater that is open, a fuse that has operated, or a defrost sensor that is out of range all produce the same picture.
Fan codes on this platform name a feedback circuit, and that circuit includes the motor and its harness as well as the board input. A motor that spins freely by hand can still fail to report back correctly, and it is a far cheaper part to replace.
A condenser fan that has stalled, or a coil packed with dust and pet hair, raises head pressure and produces poor cooling that reads as a control problem. This is the cheapest thing on the list to check and one of the most frequently overlooked.
A communication fault names the link, not one end of it. The manufacturer describes this code as covering a main board failure, a display board failure or a wire disconnection, which means replacing the main board on this code alone is a coin flip.
A refrigerator that runs continuously and cools poorly, or one where the compressor runs but the evaporator never frosts, is describing a refrigerant or compressor problem rather than a control problem. No replacement board resolves a sealed system fault.
How Hard Is the EBR73304210 to Replace, and Where Does the Board Sit?
Replacing an EBR73304210 is a moderate repair that most people complete in about 30 to 45 minutes. The board sits behind an access cover at the back of the cabinet, held by a small number of screws, with the harness connectors landing on labelled positions along the board edge.
Service documentation for this series describes the board sitting under a cover that comes off after a small number of screws are loosened, with several labelled connectors landing along the board edge. Photograph the connectors before anything is unplugged. That single photograph prevents the most common reinstallation problem on any multi connector board.
How Do You Confirm the EBR73304210 Is the Right Board for Your Model?
Confirm an EBR73304210 by reading the EBR number from the label applied to your existing board rather than the number screened into the circuit board, because that screened number is shared across this family of assemblies. A model lookup is a starting point only, since more than one board was used across production runs of the same model.
Model Number Check
Enter your refrigerator's model number to check it against our EBR73304210 compatibility records. Not found? Use the buttons below to reach our team directly.
This board carries two different numbers and only one of them identifies it. The EAX number screened into the circuit board is the base board, and it is shared with other assemblies in the same family that carry different programs and serve different models. The EBR number on the applied label is the one to order by. Click the image to zoom in.
Which LG and Kenmore Refrigerators Use the EBR73304210?
The EBR73304210 is listed for the LG LFX28978 and LFX28979 French door refrigerators and for the LG-built Kenmore Elite 795.71052, 795.71053, 795.71054, 795.71056 and 795.71059 series that share the same cabinet. Fitment always has to be confirmed against the label on your existing board.
LG LFX28979 Series, French Door With Dual Ice Makers
LG LFX28978 Series
Kenmore Elite 795 Series, Built on the Same LG Platform
Also Listed for This Board, Confirm Against Your Board Label
Model lists for this board are not identical everywhere they appear, and the last group above is carried by fewer records than the first three. Treat any model list as a shortlist and confirm fitment against the EBR number on the label of your existing board. Production runs of the same model did not always use the same board, which is why the label wins over the model number. Send us a photo of your board label and we will confirm it for you before you order.
How Is the EBR73304210 Restored to Spec? The FailSafe Precision Protocol
Every EBR73304210 sold by Appliance Pro USA goes through the FailSafe Precision Protocol, a proprietary 4-step process covering failure pattern analysis, precision diagnostic testing, proactive component replacement using equal or higher-rated parts, and final certification before the board ships.
FailSafe Precision Protocol
Failure Pattern Analysis
Known failure patterns for the EBR73304210 are mapped before any board enters the process, so we know exactly which components to focus on for this specific board type.
Precision Diagnostic Testing
Multi-point diagnostic testing identifies faults and confirms overall board condition. Boards that do not pass diagnostic testing do not advance.
Proactive Component Replacement
Components identified through failure pattern analysis as common weak points are replaced using equal or higher-rated parts, before the board is cleared to ship.
Final Certification
Certified to meet or exceed original LG factory specifications. Tamper-evident hologram applied. Anti-static packaged and sealed for shipping.
EBR73304210 Specifications and Cross-Reference Part Numbers
The EBR73304210 is an LG main control board assembly for French door refrigerators, mounted behind a rear access cover, built on a shared base circuit board carrying an EAX reference, and no longer produced by the manufacturer. Cross references recorded for it include AP5590796, PS3646302, AH3646302, EA3646302 and 2668874.
| Board type | Main control board assembly, described by the manufacturer as a main PCB assembly |
| What it controls | Temperature control, cooling and defrost timing, fan operation, sensor inputs and fault reporting to the display |
| What it does not control | The dispenser display panel is a separate board, and on this generation the compressor drive electronics are documented as a separate assembly in the machine compartment on applicable builds |
| Brand | LG, also fitted to LG-built Kenmore Elite refrigerators |
| Appliance | French door refrigerator, 27.6 cubic foot class, external ice and water dispenser |
| Board location | Behind an access cover at the back of the cabinet, secured by a small number of screws |
| Connector layout | Multiple labelled connector positions along the board edge, documented in the service literature for this series |
| Number screened on the board | An EAX base board reference, commonly recorded as EAX64121506 and in some records as EAX64121503, shared with other assemblies in this family |
| Number to order by | The EBR number on the applied label |
| Diagnostics method | Er codes shown on the dispenser display, plus a test mode entered from the board itself |
| OEM status | Genuine OEM LG board, restored to spec and FailSafe Certified |
| Manufacturer availability | Recorded as discontinued, with no factory substitute listed |
| Cross references | AP5590796, PS3646302, AH3646302, EA3646302, 2668874 |
| Sibling assemblies in the same family | EBR73304201, 203, 204, 205, 206, 207, 209, 212, 216, 217, 219, 220 and 224, which serve different models and are not interchangeable by appearance |
What Does an EBR73304210 Repair Cost Compared With the Alternatives?
Replacing an EBR73304210 yourself is generally the lowest cost route back to a working refrigerator when the board is genuinely the fault. A comparable new French door refrigerator and a technician service call both sit well above the cost of the board, though regional rates and model pricing vary widely.
What your options typically cost
What Are the Most Common Mistakes When Replacing This LG Board?
The most common mistakes with an EBR73304210 are ordering by the number screened into the circuit board, assuming any assembly in the same family will work, replacing the board for a code that names a sensor or a fan, and judging the repair before the cabinet has had time to pull down to temperature.
Ordering by the number screened into the circuit board
The EAX reference visible on the board surface is the base circuit board, and it is shared across assemblies that carry different programs and serve different models. Ordering by it is the single most common way people end up with a board that looks identical and does not work correctly.
Assuming a neighbouring number in the family will work
The assemblies around this one are physically similar and mount the same way, but they are programmed for different models. One of them is recorded for a completely different refrigerator series, and at least one other is documented as the board used on later production of this same series.
Replacing the board for a code that names something else
Most codes on this platform name a sensor, a fan or a heater circuit. Those parts are cheaper, they fail more often, and a code that names them is telling you where to test first. Replacing the board without testing the named part is how a repair gets expensive without getting fixed.
Treating a communication code as a main board verdict
A communication code describes a link that has two ends and a harness in between. The manufacturer lists a main board failure, a display board failure and a wire disconnection as the possible causes, in that order, which means one third of the answer is free to check.
Not photographing the connectors before disconnecting
The connectors on this board land in labelled positions along the board edge, and several of them are similar in size. A single photograph before anything is unplugged removes all of the guesswork on reassembly and takes a few seconds.
Judging the result before the cabinet has pulled down
A refrigerator that has been warm for days does not return to temperature in minutes. Cooling control has to run a full cycle, and any ice maker on board needs the freezer at temperature before it will produce. Judging the repair too early leads to a working board being pulled back out.
Still not working after all of the above?
Contact our team before returning anything. A brief conversation resolves the majority of post-install situations. We stand behind every board we sell and are here to help you get the result you need.
Which Other Parts Cause the Same Complaints on This LG Refrigerator?
Parts that produce the same complaints as an EBR73304210 fault include the temperature sensors, the defrost heater and its sensor, the evaporator and condenser fan motors, the display board and the harness that links it to the main board, and the sealed system itself.
Share your model number and a photo of your existing board's sticker. Our team will help confirm the right part before you spend a dollar. No pressure, no obligation.
Why Buy the EBR73304210 from Appliance Pro USA?
Appliance Pro USA supplies the EBR73304210 as a genuine OEM board restored through the FailSafe Precision Protocol to meet or exceed OEM specifications, backed by a 1-year warranty (registration required), a 30-day return policy, free priority shipping, and same-day shipping on orders placed before 4 PM EST, Monday through Friday.
At Appliance Pro USA, we specialize in high-quality reconditioned replacement control boards, professionally inspected and tested to meet or exceed OEM specifications. Every board we sell undergoes our FailSafe Precision Protocol, meaning components identified through failure pattern analysis as common weak points are replaced proactively using equal or higher-rated parts before the board ever ships to you. With a replacement board from Appliance Pro USA, you're getting a board that's been evaluated and restored to reliable working condition, backed by our 1-year limited warranty (registration required) and 30-day return policy, so you can order with complete confidence.
We offer free priority shipping on every order, and orders placed before 4 PM EST ship same day, Monday through Friday, excluding holidays and scheduled closures. Whether you're a homeowner tackling this repair yourself or a professional technician who needs a reliable source, we're here to help you get the right part and get the job done right the first time.
Not sure this is your board? Send us a photo of your original board's part number sticker and we'll confirm before you buy. Reach us at info@applianceprousa.com
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EBR73304210 LG Main Control Board, Frequently Asked Questions
The questions below cover the details owners and technicians most often get wrong on this board: which of the two numbers on it identifies the part, whether neighbouring assemblies in the family interchange, what discontinued status means for repairability, and how much of the refrigerator this board actually controls.
My board has a different number printed on it than the one on the label. Which one do I order by?
Order by the EBR number on the applied label. The other number, which begins with EAX, identifies the base circuit board that this assembly is built on, and that base board is shared with other assemblies in the same family. Two boards can carry the same EAX number, look identical, and still be programmed for different refrigerators. The applied label is the only number that identifies the finished assembly.
Can I use another board from the same EBR73304 family if the numbers are close?
No. The assemblies in this family are physically similar and mount the same way, but they carry different programs for different models. One neighbouring number in this family is recorded for an entirely different LG refrigerator series, and a different one is documented as the board used on later production of the same series this board serves. Match the full number digit for digit.
This board is listed as discontinued by the manufacturer. Does that mean my refrigerator cannot be repaired?
No. Discontinued means the factory no longer produces new stock and has not published a substitute number, not that the repair is impossible. Boards of this type are recovered, tested and restored to spec, which is the normal route back to a working refrigerator once a part reaches end of production. It does mean matching the number exactly matters more than it would on a current part.
The service documentation for my model lists a different board number. Is EBR73304210 wrong for me?
Not necessarily, and this is a genuine source of confusion on this series. Service literature for this platform names a different assembly for units built from a certain production date onward, which means one model number can legitimately correspond to more than one board depending on when the unit was made. This is exactly why the label on your existing board takes priority over any model based lookup.
Does this board drive the compressor directly, or is there another board involved?
On this generation the compressor drive electronics are documented as a separate assembly located in the machine compartment on applicable builds, while this board handles cooling logic, defrost timing, fan control and sensor inputs. If the compressor never attempts to start, the drive side and the compressor itself are both worth confirming before this board is treated as the cause.
My display is showing a number rather than an Er code. Is that a fault?
It may not be. Service documentation for this series describes a test mode entered from the board itself, and while the unit is in that state the display shows a fixed readout that reports the test step rather than a stored failure. Exit the test state, let the unit return to a normal running state, and read the display again before treating any number as a fault.
A communication code came back after I fitted a new main board. What else should I check?
The harness between the two boards and the display board itself. The manufacturer lists three possible causes for that code: a main board failure, a display board failure, and a wire disconnection. If a new main board did not clear it, the remaining two are where the fault is. Reseat both connectors and inspect the harness for damage where it passes through the cabinet.
Does a Kenmore Elite refrigerator take the same board as the LG version?
On this platform the Kenmore Elite 795.71 units were built by LG on the same cabinet, and this board is recorded for both. The badge on the door does not change the part, but the model number format does, so use the full Kenmore number when checking fitment and still confirm against the label on your existing board.
Does the replacement board need programming or a firmware update before it will work?
Boards in this family ship carrying the program that matches the number on the label, which is why the number has to match exactly rather than approximately. If a technician tells you your unit needs a configuration change after installation, that is work for a qualified technician, and a board that has been reprogrammed is no longer returnable.
How long should I wait before deciding whether the new board fixed the problem?
Give it a full day. A cabinet that has been warm needs time to pull down, defrost control has to complete a cycle before you can judge it, and any ice production needs the freezer at temperature first. If the original complaint is unchanged after a day at a normal setting with the doors kept closed, contact us before returning anything.
Which Help Center Guides Support This LG Main Board Repair?
These Appliance Pro USA Help Center guides explain what a refrigerator main control board does, how to identify the correct board from a part number, why control boards fail, what to check when an appliance does not work straight after a replacement, and the tools the job needs.
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