Safety first: Disconnect mains power. Be careful of sharp plastic edges and metal fins.

Step-by-step:

Identify which fan: Determine whether the error relates to the refrigerator fan, freezer fan, or NoFrost fan (check user manual or where the noise/airflow issue is).
Access fan: Remove shelves/drawers and the rear inner panel in the affected compartment to expose the fan assembly.
Check for ice obstruction: If the fan is encased in ice, defrost the area gently with warm air. Do not force the fan blades.
Spin test: With power still off, try turning the fan blades by hand. They should spin freely. If stiff or jammed, the motor is likely faulty.
Electrical check: Inspect the fan wiring and connector. Look for burnt pins or loose contacts.
Replace fan motor: If seized or noisy, replace the fan motor assembly with a Liebherr-specific evaporator fan unit. Transfer any gaskets or ducts from the old unit.
Reassemble and test: Refit panels, restore power, and confirm that airflow and noise are normal and that F5 does not reappear.

Display shows F5; fan noise may be abnormal or airflow reduced in the refrigerator or freezer compartment.

Possible Causes