Liebherr Refrigerator Error Code F1

F1 indicates that the refrigerator compartment air temperature sensor has been detected as defective by the control board. Because accurate temperature monitoring is no longer possible, the unit enters an emergency mode where the compressor cycles on a fixed schedule of 20 minutes ON and 40 minutes OFF. This keeps the unit running but does not replace proper temperature-controlled operation. The sensor or its associated wiring should be inspected and repaired as soon as possible.

The appliance will continue to run in emergency mode with the compressor cycling on a fixed 20-minutes-ON and 40-minutes-OFF schedule. This provides some cooling but may not maintain safe temperatures consistently, especially during warm ambient conditions or with a full load of food. It is advisable to check internal temperatures with a thermometer and minimize the time food is stored in the unit until the fault is resolved.

Repair costs depend on whether the fault is in the sensor itself, the wiring, or the control board. A replacement NTC temperature sensor typically costs in the range of $20 to $80 for the part alone. If a technician is needed for diagnosis and installation, total repair costs including labor can range from $100 to $300 or more, with control board replacement representing the higher end of that range.

A knowledgeable DIYer can inspect the sensor wiring, check connector terminals for corrosion, and test the sensor with a multimeter to determine whether the component itself has failed. If the sensor requires replacement, it is a relatively accessible repair involving disconnecting the old sensor and installing a compatible replacement. However, if the wiring harness or control board is involved, professional repair is recommended to avoid further damage.

A power reset may temporarily clear the displayed error code, but if the underlying sensor or wiring fault is still present, the F1 code will return once the control board performs its self-diagnostic checks. Resetting the unit does not repair the defective sensor or correct any wiring issues. Permanent resolution requires addressing the actual hardware fault.