The situation when a refrigerator Liebherr suddenly stops freezing always takes you by surprise. You open the door, and it’s warm inside, the food begins to spoil, and the indicators on the panel may flash or there is no sound of the motor running. This is a common problem that can be caused by either a banal electronics failure or a serious technical malfunction of the unit.
Before calling a technician, it is worth conducting an initial diagnosis yourself. In many cases, the reason lies in improper operation or easily removable defects that do not require complex intervention. However, the problem cannot be ignored, since long-term storage of products at above-zero temperatures is dangerous to health.
In this article we will look in detail at why equipment Liebherr can stop cooling, which components most often fail, and in which cases repairs are possible with your own hands, and when professional help is required. Understanding the operating principles of your model will help you quickly find the source of the problem.
Primary diagnostics and power check
The first thing to do if the refrigerator does not turn on or does not freeze is to check for the presence of electric current. Sometimes the problem is trivial: the plug has come out of the socket or the circuit breaker in the control panel has tripped. Make sure that the light is on power indicator on the front panel. If the display is inactive, try connecting the equipment to another outlet.
Pay attention to the temperature settings. In models with electronic control SmartDevice or EasyFresh a software failure may have occurred. Try rebooting the device by unplugging it for 10-15 minutes. This action will reset the controller errors.
⚠️ Attention: Do not try to turn on the refrigerator immediately after defrosting or transporting. The compressor needs time (from 2 to 4 hours) to stabilize the oil in the system, otherwise it may fail.
Check whether the “Vacation” or “Demo mode” mode is activated. In the latter case, the light is on, but the compressor does not start, simulating the operation of a store display. To turn off, refer to the instructions for your model, usually by holding a certain button for a long time.
Problems with the NoFrost system and freezing
The technology NoFrostthat most modern models are equipped with Liebherrimplies automatic defrosting of the evaporator. If the system fails, the ice “coat” blocks the circulation of cold air. As a result, the chamber is warm, although the compressor can operate continuously.
A frequent cause is a malfunction Defrost heating element or the timer. When the heating element burns out, the ice does not melt and gradually clogs the channels. Air stops flowing into the main chamber, and the temperature there rises. This can be determined by the characteristic hum or absence of sound of flowing refrigerant.
It is also worth checking the defrost sensor. If it “lies” and shows that the evaporator is warm, the controller will not start the defrost cycle. Visually, this manifests itself in the form of ice on the back wall inside the freezer compartment, if you remove the plastic panel.
☑️ Diagnostics of the NoFrost system
If after complete defrosting (at least 24 hours with the doors open) the refrigerator began to freeze normally, but after 1-2 weeks the problem repeated itself - the problem is definitely in the defrost system components. Replacement of faulty elements is required.
Faults in the compressor and start relay
Compressor are the heart of the refrigerator. If it doesn't start, there won't be any cold anywhere. A sign of a malfunction may be silence or a characteristic click, followed by a hum and a sudden stop of the motor. Often the culprit is the starting relay, which is inexpensive and easy to change.
Modern models Liebherr often use inverter compressors. They are quieter and more economical, but their diagnosis is more difficult. If the inverter control module fails, the compressor does not receive a start signal. In this case, replacement of the electronic unit is required.
Pay attention to the temperature of the motor housing. If it is hot, but does not start, there may be an inter-turn short circuit in the winding. A cold and silent compressor more often indicates a problem with the control circuit or wiring.
⚠️ Attention: Replacing the compressor yourself requires vacuuming the system and charging it with freon. Without special equipment, it is impossible to perform this operation efficiently.
Compressor life
The average service life of Liebherr compressors is 10-15 years. However, frequent power surges in the network can reduce this period by half. It is recommended to use a stabilizer.
Refrigerant leakage and capillary blockage
If the compressor runs constantly without turning off, but there is no cold or it is very weak, it is likely freon leak. The refrigerant circulates in a closed circuit, and if a micro-hole has formed somewhere (often in the foamed part of the body or at the joints of the tubes), the gas escapes.
Another similar problem is clogged capillary tube. Oil breakdown products or moisture turn into a plug that prevents the circulation of the refrigerant. The symptoms are similar to a leak: the equipment hums, but does not freeze, and the condenser (grid at the back) remains only partially cold or warm.
It is difficult to determine a leak visually. Craftsmen use leak detectors or a soap solution (if a pipe is available). On your own, you can only notice swelling of the refrigerator wall or the appearance of oily stains on the floor under the equipment.
Table of symptoms and probable causes
Use the summary table to quickly identify the problem. It will help narrow down the troubleshooting before calling a specialist.
| Symptom | Probable cause | Difficulty of repair |
|---|---|---|
| The compressor hums, but does not start | The starting relay is faulty or the compressor is stuck | Medium / High |
| The freezer freezes, the refrigerator compartment does not | The NoFrost system is clogged or the damper is faulty | Medium |
| The equipment works without stopping | Freon leakage or door seal wear | High / Low |
| Ice build-up on the back wall | The defrost heating element or temperature sensor has burned out | Medium |
| The red alarm indicator is on | Increase in temperature inside the chambers | Low (diagnostics) |
Faults in electronics and sensors
Modern refrigerators Liebherr are stuffed with electronics. The temperature is monitored thermal sensors (thermistors). If one of them fails and transmits incorrect data to the control module, the refrigerator may “think” that it is already cold inside and not turn on the compressor.
There is often a problem with the defrost sensor in the freezer. Its resistance changes with temperature, and if the values are outside the normal range, the controller blocks the operation of the system. Replacing the sensor usually solves the problem.
It is also worth checking the integrity of the wiring. Rodents, vibration, or corrosion can damage the wires to the fan or heater. Visual inspection of internal components after removing panels often reveals broken or oxidized contacts.
When you need to call a specialist
There are a number of situations when self-repair is not only useless, but also dangerous. If you have identified a freon leak, you need a specialized tool for soldering and vacuuming. An attempt to solve the problem using “folk methods” will lead to final failure.
Replacing a compressor or repairing a foamed evaporator (if the tubes are mounted in the walls of the housing) are complex operations. They require opening the case, which violates aesthetics and thermal insulation if the work is not done professionally.
If the refrigerator is under warranty, any independent intervention will void it. Opening the seals on the compressor or control unit immediately gives the service center the right to refuse free repairs.
⚠️ Attention: Information about the repair procedure is for informational purposes only. Construction details may vary depending on the specific model and year of manufacture. Always check the manufacturer's technical documentation.
Prevention and care of the Liebherr refrigerator
To avoid situations when Liebherr refrigerator stops freezing, it is important to follow the operating rules. Defrost your appliances regularly (if you don’t have NoFrost), clean the drainage holes and check the tightness of the doors. The cleanliness of the condenser at the back also affects the cooling efficiency.
Do not place hot food inside and do not load the chamber with food above the marking level. This disrupts air circulation and causes the compressor to work with overload, reducing its life.
Cleaning the condenser
Dust on the condenser grille (at the back or bottom) acts as a heat insulator. Clean it with a vacuum cleaner every six months to improve heat transfer.
Monitor the condition of the rubber seals. If they are cracked or do not fit well, warm air will enter the chamber, causing excessive ice formation and overloading the system. Wipe them with a soft cloth and, if necessary, lubricate them with silicone.
Why does the refrigerator hum, but does not freeze?
If you hear a hum, it means the motor is trying to start or is idling. Most often, this indicates a freon leak (the compressor is pumping empty gas), a clogged capillary system, or a jammed compressor. The start relay may also fail.
How long should defrosting last?
To completely defrost the ice in the NoFrost system and the evaporator, it is recommended to turn off the refrigerator for at least 24 hours. This is the only way to be sure that all hidden ice will melt and will not cause re-clogging in a couple of days.
Is it possible to use a refrigerator if it does not freeze well?
Short-term - yes, but storing perishable foods (meat, milk) in such conditions is impossible. Long-term operation of equipment in underload or overload mode (due to an attempt to compensate for the cold) will lead to combustion of the compressor.
What does the flashing SuperFrost indicator mean?
A flashing indicator usually signals an alarm: the temperature in the chamber is higher than permissible. This may be due to an open door, a large amount of warm food being loaded, or a technical fault. If after several hours of operation the indicator does not go out, diagnostics are required.