How do I fix error code E FF on a LG refrigerators?

1. undefined: Reset the unit and enter TEST MODE 1 (press test button 1 time). 2. undefined: Open the freezer door and check for airflow from the fan duct. If airflow is detected (windy), go to step 5. 3. undefined: If no airflow, manually rotate the fan blade by hand. If it feels sticky or stiff, replace the freezer fan motor. 4. undefined: If fan rotates freely, check fan motor supply voltage at CON4 pins 20-19. Expected: 11.4V-12.6V DC in TEST MODE 1. If voltage is absent or incorrect, replace main PCB. 5. undefined: Check fan feedback voltage at CON4 pins 18-19. Expected: Not 0V or 5V (should be a pulse signal). If voltage is 0V or 5V (stuck), replace the fan motor. 6. undefined: Check fan PWM signal at CON4 pins 17-19. Expected: Not 0V or 5V (should be a PWM signal). If PWM is stuck at 0V or 5V, replace the main PCB. 7. undefined: If all voltages are correct and fan airflow was detected in step 2, explain to customer that unit is operating normally.

LG Refrigerators

Error Code E FF

Defect of BLDC fan motor for freezer

Moderate

Address soon - your appliance may not work properly

How to Fix

1
Reset the unit and enter TEST MODE 1 (press test button 1 time).
2
Open the freezer door and check for airflow from the fan duct. If airflow is detected (windy), go to step 5.
3
If no airflow, manually rotate the fan blade by hand. If it feels sticky or stiff, replace the freezer fan motor.
4
If fan rotates freely, check fan motor supply voltage at CON4 pins 20-19. Expected: 11.4V-12.6V DC in TEST MODE 1. If voltage is absent or incorrect, replace main PCB.
5
Check fan feedback voltage at CON4 pins 18-19. Expected: Not 0V or 5V (should be a pulse signal). If voltage is 0V or 5V (stuck), replace the fan motor.
6
Check fan PWM signal at CON4 pins 17-19. Expected: Not 0V or 5V (should be a PWM signal). If PWM is stuck at 0V or 5V, replace the main PCB.
7
If all voltages are correct and fan airflow was detected in step 2, explain to customer that unit is operating normally.