Freezers Diagnostics

Liebherr Freezers
Error Codes

Meanings, severity levels, safe checks you can perform, and when to call a technician.

Enter the code shown on your freezers display

Is it safe to keep using it?

Depends on code severity. Low/Medium codes often allow continued use, High severity requires immediate stop.

Can error codes be reset?

Some codes clear after power cycle. Persistent codes indicate underlying issues needing repair.

When should I stop using it?

Stop immediately for water leak codes, burning smell, or any High severity error.

Most Common Codes

F3 F5 F4 F6 DF F7 AL02 HF F8 F9

All Codes

AL02 DF F3 F4 F5 F6 F7 F8 F9 F12 HF

Error Code Directory

Click any code for detailed troubleshooting steps

Low Medium High

Code Meaning Severity Common Symptom

AL02 Freezer High Temperature Alarm High The freezer high-temperature alarm tone announces that cabinet temperature is above the safe-frozen threshold and food safety is at risk. View DF Defrost Heater / Defrost Cycle Fault Medium The cabinet temperature creeps upward over a 3–7 day window as ice builds on the evaporator and progressively blocks airflow. View F3 Freezer Compartment Air Sensor Fault High A separate thermometer placed in the freezer reads 10–20°F warmer than the display target after a few hours, and frozen items begin to soften at the surface. View F4 Freezer Evaporator Sensor Fault Medium Cabinet temperature is normal at first but slowly creeps upward as ice builds on the evaporator and progressively blocks airflow from the cooling fan. View F5 Microprocessor / Control Board Fault High The control panel may go blank, show a jumbled string of characters, or display a temperature that does not change when buttons are pressed. View F6 Communication or Compressor Circuit Fault High Listen near the rear of the cabinet — a healthy Liebherr freezer compressor produces a steady soft hum. Silence or repeated start-stop cycles indicate the inverter is not receiving consistent commands. View F7 Ambient Air Sensor Fault Low Cabinet temperatures stay at the set point because the cabinet sensors are unaffected. F7 is a degraded-mode fault, not a food-safety fault. View F8 Compressor or Cooling System Abnormal High A healthy Liebherr freezer compressor produces a steady soft hum that cycles through the day. Silence or unbroken continuous running both indicate an F8-class fault. View F9 Voltage or Power Supply Fault High The freezer powers off without warning when supply voltage drops below the BluPerformance minimum, often correlated with garage power tools or HVAC startup events. View F12 SuperFrost Function Fault Medium Pressing the SuperFrost button on the control panel produces no response, or the function activates briefly and cancels itself within a minute or two. View HF Post-Power-Cut Warm Alarm Medium A continuous or pulsing alarm tone announces that the freezer experienced a temperature excursion while you were away. View

Liebherr FreezersError Codes