The situation when a premium one suddenly stops performing its main function causes panic in any owner. Products begin to deteriorate, and expensive equipment turns into a useless cabinet. However, before calling a technician, it is worth carrying out an initial diagnosis, since the cause may be hidden in trivial things that do not require professional intervention. Liebherr refrigerator suddenly stops performing its main function, causing panic in any owner. Products begin to deteriorate, and expensive equipment turns into a useless cabinet. However, before calling a specialist, it is worth carrying out an initial diagnosis, since the cause may be hidden in trivial things that do not require professional intervention.
Often, users are faced with the fact that the compressor is humming, but there is no cold, or the unit is working in heavy duty mode without turning off. In systems NoFrost and CoolingPlus failures can be caused by evaporator icing due to faulty sensors or defrost timer. Understanding the operating principles of your model will help you narrow down your troubleshooting.
In this article we will examine in detail the mechanical and electronic reasons for the lack of cold. We will consider both simple operating errors and complex technical breakdowns that require replacement of components. It is important to act consistently so as not to aggravate the situation.
⚠️ Attention: If you hear a loud knock, crackling sound, or smell a burning smell, immediately disconnect the device from the power supply to avoid a short circuit or fire.
Initial check of settings and operating mode
Before Rather than risk a breakdown compressor or a refrigerant leak, it is necessary to exclude the human factor. Sometimes an accidental touch on the control panel is enough to reset the temperature settings. In models with electronic control, children or pets can block functions or activate the “Holiday” mode.
Check the display: if the indicator SuperFrost or a similar quick freeze symbol is on, the refrigerator may have gone into emergency mode due to the door being opened for a long time. Also make sure that the temperature mode is set correctly: optimal for the refrigerator compartment +4...+5°C, and for the freezer -18°C.
Pay attention to the tightness of the products against the back wall. If you have recently loaded a lot of warm food or placed the pan close to a cold air outlet, circulation may have been affected. The system Liebherr is sensitive to the correct distribution of air flows.
Problems with tightness and seals
One of the most common reasons why the refrigerator does not freezeis depressurization of the cameras. If warm air from the room constantly penetrates inside, the unit simply does not have time to cool it, working for wear. In such cases, the compressor works without interruption, which can lead to its overheating and subsequent failure.
Carefully inspect the rubber seal round the perimeter of the doors. Over time, rubber hardens, cracks or becomes deformed. Even a microscopic gap upsets the thermodynamic balance. Check the magnetic tape inside the seal: it should be tightly but effortlessly attracted to the metal body.
Often the problem lies in the misalignment of the door hinges. If the door is sagging, it may not close tightly. This is especially true for two-door models and side-by-side refrigerators. Adjusting hinges is a delicate process that requires precision, but sometimes necessary to restore tightness.
☑️ Diagnosis of the seal
There is a simple test to check the tightness. Take a regular sheet of paper and clamp it with the refrigerator door so that half of the sheet hangs out. Try to pull out the sheet. If it comes out easily without resistance, it means that the seal does not fit in this place. Walk in this way around the entire perimeter of the door.
Malfunctions of the defrost system (for NoFrost models)
In refrigerators Liebherr with the system NoFrost lack of cold is often associated with freezing of the evaporator. Ice blocks the cold air supply channels, and the fan stops pushing air into the chambers. Externally, the refrigerator may look normal, but inside it will be warm.
Three main elements are responsible for the defrosting process: a heating element (heater), a defrosting thermostat and a timer (or electronic module). If one of them fails, the ice does not melt, a “fur coat” grows and blocks the air flow. In such cases, complete defrosting of the unit is required within 24 hours to restore operation.
⚠️ Attention: Never try to break off the ice with a knife or other sharp objects. Damage to the evaporator tubes will lead to an immediate release of freon and expensive repairs.
If after complete defrosting (at least 24 hours with the doors open) the refrigerator started working normally, but after 1-2 weeks the problem recurred, then the defect in the defrosting system is confirmed. A burnt heating element or a stuck thermostat needs to be replaced.
Why does ice form in the NoFrost system?
Ice is formed due to moisture contained in food and air that enters the chamber when the doors are opened. In a working refrigerator, this moisture settles on the evaporator and is regularly removed by the defrost system. If the cycle is disrupted, ice blocks ventilation.
Failures in the operation of the compressor and start relay
Compressor are the heart of the refrigerator. If it doesn't start, there won't be any cold anywhere. Signs of a malfunction may be: silence (except for the noise of the fans), relay clicks or a short hum followed by a shutdown.
Often the culprit is starting relay. This is a small mechanism that helps start the engine. If the relay contacts are burnt or the mechanism is jammed, the compressor cannot gain speed. Replacing a relay is a relatively inexpensive and simple procedure, accessible even to beginners.
A more serious problem is an interturn short circuit in the motor winding or mechanical wear of the piston group. In this case, the compressor may hum, but not create the necessary pressure in the system. Diagnostics requires measuring the resistance of the windings with a multimeter and checking the current.
| Symptom | Probable cause | Required actions |
|---|---|---|
| Silence, no light | No power, cord burned out | Check the socket and cable |
| Clicks, no buzzing | Faulty starting relay | Replace the compressor relay |
| Buzzing and turns off | The compressor is jammed | Call a technician, replace the unit |
| Works without stopping | Freon leak, insulation breakdown | Diagnostics of sealed circuit |
Refrigerant leakage and clogged capillary tube
If the compressor operates continuously and there is no cold or it is very weak, there is a high probability Freon leaks. The refrigerant circulates in a closed circuit, and if a microcrack has formed in the tubes (often due to corrosion), the gas escapes. Without freon, heat exchange is impossible.
Another common problem is clogged capillary tube. Not only freon circulates in the system, but also oil. Over time, clots may form or foreign particles may enter, blocking the narrow channel. The pressure in the system drops and cooling stops.
It is difficult to diagnose these problems at home. Signs may include: a hot condenser (grid at the back) only partially, absence of characteristic gurgling in the tubes when the compressor is running, swelling of the side walls of the refrigerator.
Electronics: control module and sensors
Modern Liebherr equipped with sophisticated electronics. Responsible for the operation of all systems control module. Power surges in the network can lead to burning of board elements or failure of the firmware. In this case, the refrigerator may behave inappropriately: it will not turn on, change the temperature chaotically, or display errors on the display.
Play an important role temperature sensors. They are located at different points in the cameras and transmit signals to the module. If the sensor “lies” (for example, it shows that it is -5°C inside, although it is +10°C), the compressor simply will not turn on. The sensors are checked by a continuity tester.
Sometimes the problem is solved by resetting the errors. Try unplugging the refrigerator for 15-20 minutes. This will reset the electronic unit. If after turning on the error (flashing indicator or code on the display) disappears and cold appears, there may have been a temporary failure.
⚠️ Attention: Characteristics and error codes may vary depending on the specific series and year of manufacture of the refrigerator. Always check the technical documentation of your model before replacing electronic components.
Frequently asked questions and answers (FAQ)
Why does a Liebherr refrigerator hum but not freeze?
This may indicate that the compressor is running idle due to a freon leak, a clogged system or a fan malfunction in NoFrost models. It is also possible that the compressor itself fails, which hums but does not pump freon.
How long does it take to defrost the refrigerator to check?
To completely defrost the NoFrost system and check the hypothesis that the evaporator is freezing, it is necessary to keep the refrigerator turned off with the doors open for at least 24 hours. A shorter defrosting may not melt the ice in the hidden channels.
Is it possible to operate a refrigerator if it does not freeze well?
For a short time - yes, but this is dangerous for the compressor. Non-stop operation leads to overheating of the windings and rapid wear of the motor. In addition, food can spoil, creating a risk of poisoning.
What does a flashing temperature indicator on the display mean?
A flashing indicator usually signals that the temperature in the chamber has risen above the permissible limit. This may be a consequence of loading warm products, but if the blinking does not stop after cooling, this is an error code that requires decoding according to the instructions.
How often should the door seal be changed?
The service life of the rubber seal is on average 5-7 years. However, with intensive use or improper care (aggressive chemicals), it may become unusable sooner. Check its elasticity regularly.