What Is the EBR64173902 LG Refrigerator Inverter Board Replacement?
The EBR64173902 is the genuine OEM LG refrigerator inverter board for LG refrigerators. This board manages compressor motor operation — converting power into the variable-frequency output that controls compressor speed and cooling intensity. FailSafe Certified™ and backed by a 1-year warranty from Appliance Pro USA.
What Problems Does This Board Fix?
This is the inverter board — the module that manages compressor motor operation. When it fails, your refrigerator loses the function it controls. If your LG refrigerator is showing any of these symptoms, this board is the most likely cause.
- Refrigerator not cooling or cooling inconsistently
- Compressor not starting or cutting out intermittently
- Clicking or buzzing sounds from the rear of the unit
- Freezer section too warm despite normal thermostat settings
- Refrigerator running constantly without reaching set temperature
These symptoms point to the main control board as the most likely cause — but refrigerators are complex systems, and the same symptoms can occasionally stem from a thermistor, door switch, wiring harness, or compressor issue. If a technician has identified the control board specifically, or if you've already ruled out other components, this is your part. When in doubt, a quick diagnostic by a local appliance technician before purchasing can save time and money.
How Do I Know If This Is the Right Board for My Refrigerator?
Match the part number on the sticker on your original board to EBR64173902. Your LG refrigerator part number is on a sticker on the board — look for the EBR or CSP prefix. Not sure? Contact us before purchasing and we'll verify for free — same business day.
Genuine OEM — FailSafe Certified™ Reconditioned
Every EBR64173902 board from Appliance Pro USA is a genuine OEM LG board precision-rebuilt through the FailSafe Precision Protocol™ — a proprietary 4-step recertification process built around what we know fails on this board, not just what shows a problem on arrival.
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Failure Pattern Analysis — We've mapped the failure signatures specific to the EBR64173902, identifying exactly which components degrade and fail over time.
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Targeted Component Replacement — We don't wait for components to fail a test. Through failure pattern analysis specific to this board, we know exactly what fails and when — so every board gets those components replaced before it ships.
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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 — Board is certified to meet or exceed original LG factory specifications before shipping.
Key Features
- Genuine OEM LG inverter board — FailSafe Certified™ Reconditioned
- Rebuilt through the FailSafe Precision Protocol™ — known failure-prone components replaced before they become a problem
- Restores compressor motor operation — converting power into the variable-frequency output that controls compressor speed and cooling intensity
- Minor cosmetic wear may be present due to prior installation — does not affect performance
Board Type and Function
Inverter Board — the dedicated power module that drives the compressor motor. Unlike a main control board that manages overall refrigerator logic, the inverter board has one job: convert power into the variable-frequency output the compressor needs to run at different speeds. When it fails, the compressor stops entirely and the refrigerator loses all cooling capability.
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. Always verify the exact meaning in your model's owner's manual 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 before purchasing any part.
★ = Most directly associated with main control board failure
How to Install a LG Refrigerator Inverter Board
Most DIY-confident homeowners complete this install in 30-45 minutes using a Phillips screwdriver. Unplug the refrigerator, remove the rear access panel, disconnect all wire harnesses from the old board, snap the new board into the mounting position, reconnect all connectors, replace the panel, and restore power.
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. 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). See our full warranty policy for details. Damage caused by improper installation, electrical surges, or physical damage is not covered.
Returns
Returns accepted within 30 days of purchase. Items must be returned in original condition. All returns may be subject to deductions for original and return shipping fees. Restocking and retesting fees may apply to opened or installed boards — these fees are waived for exchanges, though reshipping costs and any price difference between products will apply. Boards returned with physical damage, missing components, or signs of improper installation may not be eligible for a full refund.
Important Installation Notes
Most DIY-confident homeowners complete this install in 30-45 minutes using a Phillips screwdriver. If you're unsure at any point, we recommend consulting a qualified technician.
This is not a universal inverter board — it is designed as a direct replacement for the specific part number printed on your original board. Some units may require a firmware update after installation; firmware updates and configuration changes should be performed by a qualified technician. Please note: any board that has been flashed, reprogrammed, or had its firmware altered is not eligible for return.
Last Updated: May 2026
