Display shows E14 and the refrigerator may not enter or exit defrost correctly, with erratic frost patterns.

Safety first: Unplug the refrigerator before accessing the control board.

Perform a hard reset:

• Unplug the refrigerator for at least 10 minutes to fully discharge the control board.
• Plug it back in and monitor whether the E14 code returns.

• Inspect wiring to defrost components: Check harnesses from the main board to the defrost heater, thermostat, and evaporator thermistor for damage or loose connections.
• Verify sensors and heater: If not already done, test the defrost heater and sensors to ensure they are within specification.
• Replace main control board: If all field components test good and E14 persists, the main control board defrost logic is likely faulty. Replace the board with the correct Insignia part number.

Warning: Control board replacement involves handling static-sensitive electronics. Use proper ESD precautions or have a professional perform the repair.