Liebherr Freezers AL02 Error: Freezer High Temperature Alarm
What Does Liebherr Freezer AL02 Mean? The AL02 display message on a Liebherr freezer is the high-temperature alarm: cabinet temperature has climbed above the safe-frozen threshold (typically around 10°F / -12°C, depending on model and configuration). AL02 is an alert, not a hardware fault. The question is whether the temperature excursion was caused by something […]
Quick Assessment
Answer to continue safely
Is it safe to keep using?
Maybe. If AL02 follows a clear door event and clears within an hour, the unit is fine. If AL02 persists or returns repeatedly, an underlying fault is present and food safety is at risk.
Can I reset the code?
Yes. AL02 self-clears as soon as cabinet temperature returns below the alarm threshold. Acknowledge the audible alarm via the control panel button.
When to stop immediately?
Stop if you notice: AL02 paired with F3, F4, F6, or dF, Temperature continues climbing after the door is confirmed closed.
Symptoms You May Notice
Audible alarm sounds continuously or in long pulses
The freezer high-temperature alarm tone announces that cabinet temperature is above the safe-frozen threshold and food safety is at risk.
AL02 label visible in the temperature display
The display cycles AL02 alongside the actual cabinet temperature, which is now above the alarm setpoint.
Frozen food at the upper level feels soft or partially thawed
Items at the top of the freezer warm first because cold air settles to the bottom — soft cardboard packaging, slushy ice cream, and softened meat at the top are all telltale signs.
Compressor running continuously without bringing temperature down
The freezer is trying to recover but cannot keep up with the heat load — usually because the door has been open recently, the cabinet was overloaded with unfrozen food, or an underlying cooling fault is present.
Possible Causes
Door was left open or opened repeatedly during loading
The most common benign cause — extended door opening lets warm room air into the cabinet and triggers the alarm. Cabinet temperature recovers within an hour of the door being closed properly.
DIY PossibleLarge quantity of unfrozen food loaded without SuperFrost
Adding warm food in bulk — meat from a hunting trip, restaurant leftovers, garden produce — without first activating SuperFrost overwhelms the cooling system and triggers the alarm.
DIY PossibleUnderlying cooling fault (sensor, defrost, or compressor)
If AL02 appears without an obvious door or load event, an underlying fault (F3, F4, F6, dF) is preventing the cooling system from holding temperature.
Requires ProfessionalSafe Checks You Can Do
-
1
Verify the door is fully closed and check for obstructions
Push the door firmly closed and listen for the magnetic seal engaging. Run a paper test: close the door on a slip of paper. If the paper pulls out without resistance, something is preventing a full seal — check for tall items in the door bins, drawer fronts that have shifted, or accumulated ice on the gasket.
Most AL02 events clear themselves within an hour once the door is properly closed.
-
2
Check for any other F-codes alongside AL02
Look at the display history or the SmartDeviceBox app log. If AL02 is the only code present and there has been a recent door event, monitor for an hour and confirm temperature returns to the set point. If AL02 is paired with F3, F4, F6, or dF, the underlying fault must be addressed first.
AL02 alone is benign; AL02 + any F-code is a service call.
When to Call a Professional
Contact a qualified technician if:
- AL02 with no recent door event or food load
- Unit is more than 10 years old
- SGN biomedical-grade unit storing temperature-critical material
Need Professional Help?
Find qualified technicians in your area for proper diagnostics and repair.
Freezers Repair Service Schedule Appointment