LG Oven Range Control Malfunction? 6871W1N012B Sub PCB Assembly — Fix Control Faults Fast

When your LG oven range displays error codes, has unresponsive controls, or heats inconsistently, a failed sub PCB assembly is a common cause. In LG range models using the 6871W1N012B sub board, this component manages secondary control functions between the main control board and the user interface or heating elements. When it fails, the range may display fault codes, lose control of one or more functions, or behave erratically. ⚡ Common failure point in LG ranges with electronic control systems. Part 6871W1N012B is the genuine OEM sub PCB assembly that restores full control board communication and normal range operation.

❓ Is This the Right Part?

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

• ✔ Range powers on — display and some controls respond
• ✔ Main control board has been confirmed functional (no burn marks or failed relays)
• ✔ Heating elements have been tested and confirmed intact
• ✔ Power supply to the range is confirmed at 240V
• ✔ ONLY problem is error codes, unresponsive controls, or erratic heating behaviour

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

🔧 Common Symptoms

• Error codes or fault codes on the display that won’t clear — most common complaint
• Oven controls unresponsive or intermittently responsive
• Inconsistent or erratic heating — oven doesn’t reach set temperature
• One or more burner zones not responding to control input
• Range powers on but specific functions are completely non-operational
• Display shows garbled characters or goes blank intermittently

✔ If these symptoms match, this is the most likely failed component in the system.

✔ In most cases, replacing the sub PCB assembly restores full control function immediately.

📦 Part Details

• Part Number: 6871W1N012B
• Type: Sub PCB assembly — secondary control board, LG OEM
• Replaces: OEM direct-fit sub PCB assembly (no modification required)
• Brands: LG

⚙️ Installation

Skill Level: ADVANCED — 30–45 minutes. Disconnect power at the circuit breaker before beginning — this is a 240V control board repair. Photograph all connector positions and wiring routing before removal. The sub PCB is typically accessed from the rear control panel — remove the back panel, disconnect the wiring harness, unmount the board, and install the new assembly in the same position. Reconnect all connectors firmly and verify no wires are pinched before reassembly.

💡 Pro Tip

Contact us to verify compatibility with your LG range model number before ordering.

✓ Model-Specific Repair Pages