The refrigerator's interior light and display are working, but there is no cooling and the display indicates 'F05' or a fan error.

Safety first: Disconnect the appliance from mains power before accessing internal panels.

Steps:

• 1. Check airflow: With the door closed for several minutes and then opened, place your hand near the air outlets in the refrigerator compartment. Little or no airflow suggests a fan issue.
• 2. Listen for fan noise: When powered (for testing), you should hear a gentle fan sound when the compressor is running and the door switch is held closed. If it is silent or grinding, suspect the fan.
• 3. Access the evaporator cover: Remove shelves and the rear interior panel of the refrigerator compartment (or freezer, depending on the model) to expose the evaporator and fan assembly.
• 4. Inspect for ice buildup: If the fan is encased in ice, the blades cannot turn. Fully defrost the unit by unplugging it and leaving the doors open for several hours. Protect the floor from water.
• 5. Check fan wiring: Ensure the fan connector is firmly attached and the wires are not cut or pinched.
• 6. Spin test: Gently rotate the fan blades by hand. If they are stiff or seized, the motor is likely defective.
• 7. Replace the fan motor: Order the correct V-ZUG evaporator fan motor assembly. Transfer any mounting brackets or grommets from the old motor and reinstall, ensuring the blades do not rub against the housing.
• 8. If F05 persists with a new fan: The main control board may not be supplying power to the fan. This requires voltage checks and likely board replacement by a professional.

Warning: Do not use sharp tools to remove ice from around the evaporator or fan; you can puncture refrigerant lines.