The situation when Liebherr refrigerator ceases to maintain the set temperature always causes concern for the owner. Products begin to deteriorate, condensation or ice crust appears on the walls, and the compressor may work without interruptions or, conversely, too rarely. German technology is famous for its reliability, but even high-quality Liebherr are subject to component wear, which affects refrigerant circulation the accuracy of sensor readings.
Before calling a technician, it is worth carrying out an initial diagnosis, since often the problem lies in trivial things that can be fixed independently. Understanding the principles of operation NoFrost systems or SmartFrost will help you quickly identify the source of the malfunction. In this article, we will analyze in detail the main causes of failures and methods for eliminating them.
Incorrect temperature settings
Users often accidentally change the settings, especially if there are children in the house or power surges have occurred. Digital control in models Liebherr Premium or Liebherr Comfort is sensitive, and incorrect data entry may result in the unit operating in an economy mode that is insufficient for the current volume of products.
Check the control panel. If you see that the “Alarm” indicator is on or the temperature symbol is blinking, it means that the system has detected a deviation. For models with a mechanical regulator (knob)
⚠️ Attention: Setting the regulator to the maximum value (usually 7) will not make cooling faster, but will make the compressor work harder, which can lead to overheating and failure.
It is recommended to set the average values: +4..+5°C for the refrigerator compartment and -18°C for the freezer. After changing the settings, give the equipment 4-6 hours to stabilize the processes.
Damage to the door seal
One of the most common reasons why Liebherr refrigerator does not keep cold is depressurization of the circuit. Over time, the rubber seal loses elasticity, cracks or deforms. Through the resulting cracks, warm air flows inside, forcing the compressor to work in increased mode.
Perform a simple test: clamp a sheet of paper between the door and the body in different places around the perimeter. If the sheet is pulled out too easily or falls out on its own, then the fit is broken. Also inspect the rubber for mechanical damage or adhering debris that prevents tight closure.
In some cases, the seal can be restored if it has simply lost its shape, but is not torn. To do this, you can gently warm it up with a hairdryer or boiling water to restore elasticity.
Failure of the thermostat or temperature sensor
For accurate climate control inside the chambers respond thermostats (in mechanical models) or air sensors (in electronic ones). If this component fails, it can send false signals that the temperature is normal, when in fact the food is already defrosting.
Models Liebherr with the system BioFresh use a complex network of sensors. Failure of one of them can block the operation of the entire cooling system. Signs of a malfunction are:
- ❄️ The compressor does not turn on, although the chamber is warm.
- ❄️ The unit operates continuously, without going to rest.
- ❄️ Severe freezing of the evaporator is observed during normal operation of the motor.
Replacing the thermostat requires disassembling the internal panel and having a multimeter to check the circuit. If you do not have the skills to work with electricians, it is better to entrust this procedure to a specialist.
Problems with the defrost system (NoFrost)
If your Liebherr refrigerator is equipped with the NoFrost system, but a “coat” of ice is growing on the back wall or in the corner of the freezer, then the cycle is broken defrost. Ice blocks the channels through which cold air should enter the chamber, which is why the temperature rises, although the compressor hums.
The main culprits for defrost cycle failure:
- 🔥 Defrost heating element - heating element that could burn out.
- 🕰️ Timer or control module - does not give a command to start defrosting.
- 💧 Defrost sensor - incorrectly reads the evaporator temperature.
Diagnostics often require complete defrosting of the unit within 24 hours. If, after switching on the operation, ice quickly builds up again in one place, the problem is confirmed.
Why should you not chip off the ice with a knife?
Mechanical removal of ice with sharp objects can damage the evaporator tubes in which the refrigerant circulates. This will lead to an immediate leak of freon and costly repairs with replacement of the sealed circuit.
Refrigerant leakage or capillary tube blockage
The most serious technical malfunctions are associated with a violation of the tightness of the circuit or its blockage. If freon evaporates through a microcrack, the cooling performance decreases. The compressor tries to compensate for the lack of gas by working around the clock, but the temperature does not drop.
Clogging of the capillary tube often occurs due to moisture entering the system or oil oxidation products. In this case, the refrigerant cannot circulate in the required volume.
The symptoms of these problems are similar:
- 📉 The freezer is working, but the refrigerator is warm.
- 🔊 The compressor is hot and runs non-stop.
- 🧊 The evaporator is covered with an uneven layer of frost or is completely clean.
⚠️ Attention: Independent refilling with freon is impossible without special equipment and a license. An attempt to puncture the system to check the pressure is guaranteed to lead to a complete loss of tightness.
Comparative analysis of symptoms of malfunctions
To quickly determine the reason why Liebherr stopped holding the temperature, it is convenient to use pivot table. It will help to weed out unsuitable options and focus on the likely ones.
| Symptom | Probable cause | Difficulty of repair | Need a technician |
|---|---|---|---|
| The compressor does not turns on | Thermostat or start relay is faulty | Low | Desirable |
| Works constantly, there is cold | Damaged seal or sensor | Average | No (seal) |
| Works constantly, no cold | Freon leak or blockage | High | Required |
| Ice on the back wall | Defrost system failure (NoFrost) | High | Yes |
This table is for informational purposes only character. An accurate diagnosis can only be made by a specialist with diagnostic equipment.
⚠️ Attention: The design of refrigerators Liebherr may vary depending on the year of manufacture and series. Details of the control system and sensor locations may change, so before ordering spare parts, check the part numbers with the technical documentation of your model.
The influence of external factors and operation
Sometimes the reason lies not in the breakdown, but in the operating conditions. If the refrigerator is located next to the radiator, in direct sunlight or in a niche without ventilation gaps, the cooling system cannot cope with the heat influx. The critical factor is the room temperature: most Liebherr models are not designed to operate at temperatures below +10°C or above +32-38°C (depending on the climate class).
It is also important to check the loading density. If food is placed close to the back wall or blocks the ventilation holes, air circulation it is violated. This creates “warm pockets” where the temperature will be higher than normal, even if the sensor shows the correct value.
Diagnostic checklist before the call masters
Before submitting a repair request, perform a sequential check. This will help the technician more accurately give the preliminary cost of the work over the phone or, perhaps, solve the problem himself.
☑️ Checking the condition of the refrigerator
If after completing all the steps the problem persists, and the temperature inside the chambers does not drop to standard values within 24 hours, professional intervention is most likely required. Do not delay repairs, as long-term idling of the compressor or storing food at elevated temperatures can lead to damage to expensive components and products.
Frequently asked questions (FAQ)
Why does the Liebherr refrigerator hum, but the temperature does not drop?
Most likely, it happened There is a refrigerant leak or a blockage has formed in the capillary system. The compressor is running, but the freon is not circulating or there is not enough freon to create cold. A call to a technician is required to look for leaks and refill.
How often do you need to defrost a Liebherr with the NoFrost system?
Technically, the NoFrost system does not require manual defrosting. However, manufacturers recommend carrying out preventive defrosting and washing 1-2 times a year for hygienic purposes and checking the condition of the seals.
Is it possible to use a Liebherr refrigerator in an unheated country house in winter?
Only if the model has a climate class SN-T or ST and the function of operating at low ambient temperatures. Conventional models at temperatures below +10°C may stop freezing due to thickening of the oil in the compressor and changes in freon pressure.
What does the flashing temperature indicator on the panel mean?
This is an Alarm that lights up if the temperature in the chamber has risen above the permissible threshold. Check whether the door is tightly closed and whether the refrigerator is not overloaded with warm food.