The refrigerator compartment is not cooling properly; the temperature is too high despite normal display operation.

Safety first: Disconnect the V-ZUG refrigerator from the main power supply before removing panels or accessing wiring. Do not work on live circuits.

Step-by-step checks:

• 1. Verify actual temperature: Place an accurate thermometer in the refrigerator compartment and compare it to the set temperature. If the display shows a normal value but the interior is warm, an NTC issue is likely.
• 2. Power reset: Unplug the appliance for 5–10 minutes, then reconnect. If F01 reappears after a short time, proceed with the inspection.
• 3. Access the refrigerator NTC: The V-ZUG refrigerator compartment NTC is typically located behind a small plastic cover on the rear interior wall or near the air outlet. Remove shelves and the cover carefully.
• 4. Inspect the sensor and wiring: Check for moisture ingress, corrosion on the NTC connector, or damaged insulation on the cable leading to the main control module (usually located at the rear, behind the lower service panel).
• 5. Clean and reseat connectors: If corrosion is present, gently clean the contacts with an electrical contact cleaner and reseat the plug firmly.
• 6. Test the NTC (for advanced users): With the appliance unplugged, disconnect the NTC from the harness and measure its resistance with a multimeter. Compare it to V-ZUG service values (typically around 5–10 kΩ at 25°C; the exact value depends on the model). If the reading is open, shorted, or far out of range, the sensor is defective.
• 7. Replace the NTC sensor if faulty: Order a genuine V-ZUG refrigerator compartment NTC sensor for your exact model. Install it in the same position, ensuring good contact with the wall and correct routing of the cable.
• 8. If the sensor and wiring are OK: The fault may lie in the main control board’s sensor input. At this point, a professional diagnosis with V-ZUG service documentation is recommended.

Warning: If you are not comfortable using a multimeter or accessing internal wiring, contact an authorized V-ZUG service technician.