Refrigerator or BioFresh compartment shows error code F1; temperature may be incorrect or fluctuating.

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

Step-by-step:

• Locate the sensor: In many Liebherr refrigerators, the refrigerator compartment NTC sensor is behind a small plastic cover in the rear wall or ceiling of the fresh food section.
• Visual inspection: Remove the cover and inspect the sensor and wiring. Look for broken insulation, pulled wires, or signs of moisture damage.
• Connector check: Trace the sensor cable to its connector (often routed to the top or rear of the cabinet). Unplug and re-plug the connector to ensure a solid connection.
• Basic resistance check (if you have a multimeter): With the sensor disconnected, measure resistance across the sensor leads. A typical Liebherr NTC will read between ~2–20 kΩ depending on temperature. Infinite (open) or near 0 Ω (short) indicates a bad sensor.
• Replace if faulty: If the sensor is open/shorted or physically damaged, replace it with a Liebherr-compatible refrigerator compartment NTC sensor. Route the new sensor cable along the original path and secure it with clips.
• Reassemble and test: Refit covers, restore power, and allow 12–24 hours for temperatures to stabilize. Confirm that the F1 code does not return.