What Is the CSP30021026 LG Refrigerator Main Control Board Replacement?
The CSP30021026 is a replacement control board for LG refrigerators, mounted in the rear machine compartment near the compressor or behind an access panel at the base or back of the cabinet depending on the model. It manages onboarding and power-control functions and governs core operations like cooling and defrost cycle timing. FailSafe Certified and backed by a 1-year warranty from Appliance Pro USA.
CSP30021026 is the current LG service replacement for the earlier production boards EBR78940637 and EBR83806908 - if your old board shows either of those numbers, this is the correct board to order.
What Does the CSP30021026 Fix on a LG Refrigerator?
This board is the usual fix when you see any of the following:
- Refrigerator won't power on or the control panel is unresponsive
- Freezer or fresh food section isn't cooling properly
- Frost or ice buildup because the defrost cycle isn't completing
- Fridge won't finish initial setup or onboarding after installation
- Power or control signal to components cuts in and out
- No display or unexplained error codes at the control panel
These symptoms point to the refrigerator control board as the most likely cause - but appliances are complex systems, and the same symptoms can occasionally stem from a sensor, switch, wiring harness, or motor issue. If a technician has identified the control board, or you've ruled out those components yourself, this board is your fix. When in doubt, contact us before you order - we're happy to walk you through some troubleshooting, and a photo of your board is usually all we need. A diagnosis from a local appliance technician works too.
How Do I Know If This Is the Right Board for My Refrigerator?
Pull power to the fridge and locate the board - check the rear machine compartment near the compressor first, or the access panel/kick-plate at the base or back of the cabinet. Compare the number printed on your old board against CSP30021026 or its earlier equivalents, EBR78940637 and EBR83806908. Any of those numbers on your original board confirms this is the right replacement. This board is also catalogued under EBR78940637, EBR83806908, OEM20676996, LGAPCSP30021026, EBR838069, SJ-CSP30021026 - any of those numbers on your sticker means this is your board. Your LG refrigerator part number is on the sticker on the original board - look for the EBR or CSP prefix.
Other part numbers used for this board: EBR78940637, EBR83806908, AP6892329, OEM20676996, LGAPCSP30021026, EBR838069, SJ-CSP30021026. Retailers and parts catalogs list the same board under these numbers.
Not sure? Send us a photo of your board and its sticker before you order and we'll verify it for free - same business day.
Compatible Refrigerator Models
This board is ordered by part number, not by appliance model. Send us your full model number and a photo of your board's sticker and we will confirm fitment before you buy - same business day.
| Also reported to fit - verify by the label on your board |
| 75042/MFGMODELNUMBER/ASWCSE0 |
75043/MFGMODELNUMBER/ASTCSE0 |
75049/MFGMODELNUMBER/AWBCSE0 |
| 79575042610 |
79575049610 |
GR-L268LQUM/MFGMODELNUMBER/ASWCSE0 |
Reported fit is general reference material - confirm by the part number on your board's sticker before ordering.
This model list is for reference only. LG may change boards between production runs, so two appliances with the same model number can use different boards. Always order by the part number printed on your original board - it is the only identifier that decides.
Genuine OEM - FailSafe Certified™ Reconditioned
Every CSP30021026 board from Appliance Pro USA is a genuine OEM LG board restored to reliable working condition through the FailSafe Precision Protocol™, our 4-step recertification process built around what actually fails on this board:
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Failure Pattern Analysis - We've mapped the failure signatures specific to this board, identifying which components degrade and fail over time.
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Targeted Component Replacement - The components this board is known to lose are replaced before they get the chance to fail.
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Proactive Rebuild Standard - Known high-failure components are replaced with new parts on every board, regardless of whether they show a problem yet. Degraded parts don't ship.
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Final Certification - Every board is tested and certified to our internal FailSafe Precision Protocol standard for function and lifespan before it ships.
Key Features
- Genuine OEM LG main control board - not an aftermarket copy
- FailSafe Certified and tested before it ships
- May arrive as a reconditioned unit pulled and tested from a working appliance
- Minor cosmetic wear may be present due to prior installation - it does not affect performance
Board Type and Function
This is the main control board that runs the refrigerator's core operations. It handles onboarding when the unit is first powered up or reset, manages power distribution to key components, and times out the defrost cycle so frost doesn't build up on the evaporator. When this board fails, you typically lose cooling control, defrost timing, or power to the control panel altogether.
Common LG Refrigerator Error Codes
If your LG refrigerator is displaying an error code, the table below describes what it typically indicates. Codes marked ★ are most directly associated with main control board failure. These are general LG codes and can vary by your exact model. Always confirm the exact meaning in your model's owner's manual or service guide before ordering any part.
| Code |
What It Means |
| ★ CO |
Communication failure between main control board and display board |
| ★ Er CF / CF |
Condenser fan feedback signal error - board not receiving fan confirmation signal |
| ★ 22 |
Compressor relay problem - board-managed compressor circuit fault |
| ★ dH |
Defrost cycle timed out - evaporator did not reach target temperature within 1 hour |
| Er FF |
Freezer evaporator fan failure - fan not circulating cold air in freezer |
| Er rF |
Refrigerator evaporator fan failure - fan not circulating air on fresh food side |
| Er FS |
Freezer temperature sensor failure |
| Er rS / r2 |
Refrigerator temperature sensor failure - upper (rS) or lower (r2) section |
| dS |
Defrost temperature sensor short or disconnection |
| Er IF / IS / It |
Ice maker fan (IF), temperature sensor (IS), or motor (It) failure |
| CH E / CL E |
Refrigerant leak detected - high-side (CH E) or low-side (CL E). Requires professional service |
| OF F |
Demo mode active - cooling disabled. Not an error. Deactivate via control panel hold sequence |
Error code definitions vary by LG model series. Always confirm the exact meaning in your refrigerator's owner's manual or service guide before purchasing any part.
★ = Most directly associated with main control board failure
How to Install a LG Refrigerator Main Control Board
Unplug the refrigerator before you touch anything. Depending on your model, you'll need to pull the unit out and remove a rear panel, or drop the base kick-plate to reach the board. Photograph the wiring harness before you disconnect it - that picture saves you guesswork on reassembly. Handle the new board by its edges only, since static can damage it before it ever gets power. Most people finish this swap in under 30 minutes with basic hand tools. Once it's buttoned back up, give the refrigerator a few hours to cycle and settle before you judge whether the repair worked.
Shipping
Every board is physically in stock - no backorders, no drop shipping. Orders placed before 4:00 PM EST ship the same business day. Tracking provided on every order.
Warranty
Backed by a 1-year warranty from Appliance Pro USA (registration required - the card is in the box). If the board fails due to a defect within the warranty period, we'll repair or replace it at no charge (shipping fees may apply). Warranty coverage is determined at Appliance Pro USA's discretion. Boards that have been tampered with, or with the verification seal (hologram or tamper-evident sticker) removed or damaged, are not eligible for warranty coverage. Damage caused by improper installation, electrical surges, or physical damage is not covered.
Returns
Returns are accepted within 30 days of delivery. Boards that are unopened and uninstalled, in original condition with the verification seal (hologram or tamper-evident sticker) intact, qualify for a full refund. If the board has been opened or installed, contact us before sending it back with a photo of the board you received, the reason for the return, and a photo of your original board's part-number label so we can verify fitment and approve the return. Boards returned used, altered, damaged, or with the verification seal missing may receive a partial refund in line with our return policy. Exchanges for the correct part are always available.
Not sure it's the board? Before you order, and before you return, contact us. We offer free troubleshooting help and can usually tell from a photo of your board and its symptoms whether this is the right part. Only a technician can fully diagnose your appliance.
