Refrigerator Not Cooling or Displaying Error Codes? LG Main Control Board EBR34917104 – Fix Control Failures Fast

A failed main control board can cause your LG or Kenmore refrigerator to stop cooling, display error codes, or behave erratically — and is one of the most common causes of complete refrigerator failure. In LG LFX-series and Kenmore 795-series bottom-freezer refrigerators, the main PCB assembly manages all core functions including cooling cycles, defrost timing, compressor control, and fan operation. When it fails, the refrigerator may stop cooling entirely, run continuously without reaching temperature, or display fault codes that cannot be cleared. ⚡ Common failure point in LG-built bottom-freezer refrigerators — updated microprocessor, transformer, coils, and relay included. Part EBR34917104 is the genuine OEM replacement main control board that restores full refrigerator function with an updated design that supersedes EBR34917102 and 6871JB1431A.

❓ Is This the Right Part?

This is the correct fix if ALL of the following are true:

• ✔ Refrigerator has power — lights and display activate
• ✔ Compressor, fans, and sensors have been tested and are not the root cause
• ✔ Error codes point to a control board fault, or the board shows visible burn damage
• ✔ ONLY problem is erratic operation, no cooling, or persistent error codes that cannot be cleared

Not sure? Send us your model number — we'll confirm before you order.

🔧 Common Symptoms

• Refrigerator not cooling — compressor does not start or runs continuously
• Error codes displayed that cannot be cleared by power cycling
• Defrost system not activating — ice buildup in freezer compartment
• Fans not running or running at incorrect speeds
• Refrigerator completely dead despite confirmed power at the outlet
• Intermittent cooling — unit works sometimes then stops unexpectedly

✔ If these symptoms match, the main control board is the most likely failed component in the system.

✔ In most cases, replacing the PCB assembly restores full refrigerator operation immediately.

📦 Part Details

• Part Number: EBR34917104
• Type: Refrigerator Main PCB Control Board Assembly — updated microprocessor, transformer, coils, and relay
• Replaces: 6871JB1431A, EBR34917102
• Note: Part may differ in appearance from previous versions but is the functional equivalent and direct replacement.
• Brands: LG, Kenmore (LG-built)

⚙️ Installation

Skill Level: MODERATE — 20–30 minutes. Disconnect power at the breaker before beginning. The main control board is located in the rear lower section of the refrigerator behind an access panel. Photograph all wire harness connections before disconnecting. Remove the mounting screws, swap the board, reconnect all harnesses in the original positions, and restore power. Allow the refrigerator 24 hours to reach operating temperature before evaluating performance.

✓ Compatible Models

Confirmed compatible with LFX21960ST, LFX25960SB, LFX25960ST, LFX25960TT, 79577562600, 79577563600, 79577564600, 79577569600, 79577572600, 79577573600, 79577579600 plus additional LG and Kenmore bottom-freezer refrigerator models. Contact us to verify your model number before ordering.

💡 Pro Tip

✓ Model-Specific Repair Pages