A situation when freezer suddenly ceases to perform its main function, can take any refrigerator owner by surprise. You open the door in the hope of getting frozen food, but instead of icy air you feel only room temperature, and the contents begin to melt before your eyes. This is not just a household inconvenience, it is a direct threat to the safety of your supplies, requiring immediate intervention.
Before calling a technician or looking for urgent solutions on the Internet, it is necessary to conduct an initial diagnosis. Often the reason that refrigerator stopped freezing is simple carelessness or improper operation, and not a serious breakdown of expensive components. In this article, we will analyze in detail why freezer it could fail, which components most often break down, and whether you can fix the problem yourself.
Understanding the operating principles of your equipment is the first step to successful repair. Modern units, whether Liebherr, Bosch or more budget models, have a similar cooling system design. If you notice that temperature the inside of the chamber has risen, do not panic, but sequentially check each of the possible options for equipment failure.
Checking the settings and operating mode of the refrigerator
The most common and easily eliminated reason for the lack of cold lies in broken settings. An accidentally touched button or a power surge in the network could switch the operating mode to “Rest” or “Demo”. In this case compressor it simply does not start, since the electronics do not give it such a command. Check the digital display or the position of the temperature control.
Make sure that the long-term fast freezing mode is not activated, if your model has such a function. Sometimes users turn it on Super Freeze and forget to turn it off, which can lead to system overload, although more often the problem lies in the opposite - insufficient cooling power due to incorrect setting of the thermostat slider. If the regulator is mechanical, it could have moved to the “minimum” position.
⚠️ Attention: In some modern electronically controlled models, the settings may be reset after a power outage. Do not rely on the device’s memory, always double-check the set parameters manually.
You should also pay attention to the tightness of the door. If seal it is worn out or crumbs are stuck on its surface, the cold will evaporate outward and warm air will flow inward. The compressor will work hard, trying to compensate for heat loss, but in the end it may go into defense or simply not cope with the task.
Problems with the defrosting system and ice
One of the most common technical problems is the formation of excessive ice cap on the back wall or evaporator. This is especially true for refrigerators with a No Frost system, where the defrosting process is automated. If the defrosting system fails, ice blocks the ventilation ducts, and cold air physically cannot enter the ice cap freezer compartment.
In models with a drip system (“crying wall”), water must drain into a special groove. If the drain hole is clogged with debris or ice, the water freezes, forming an ice plug. As a result evaporator ice becomes overgrown, the efficiency of heat transfer decreases, and the temperature inside rises. Visually, this may look like a large piece of ice on the back wall.
To eliminate this problem, a complete defrost of the unit is often required. It is necessary:
- ❄️ Disconnect the refrigerator from the power supply for at least 12-24 hours.
- ❄️ Open all doors to allow warm air to enter.
- ❄️ Remove visible pieces of ice (carefully, without sharp objects).
- ❄️ Clean the drainage hole with warm water.
☑️ Defrosting checklist
If after defrosting and turning on refrigerator it started to freeze, but after a few days the problem recurred, it means that one of the elements of the defrost system is faulty: the heating element, defrost sensor or timer. In this case, replacement of the failed part is required.
Faulty compressor and start relay
Compressor is the heart of the refrigeration unit, creating pressure for the circulation of the refrigerant. If it doesn't work, there will be no cooling anywhere. You can determine its condition by ear: a working motor hums evenly and quietly. If you hear a loud knocking, clicking or humming that ends abruptly after a few seconds, the problem is in the starting relay or the engine itself.
The starting relay is responsible for starting the engine. If it breaks down, the compressor tries to start, a click is heard, but the shaft does not rotate. After some time, the thermal relay opens the circuit to prevent the windings from burning out, and the cycle repeats. In such a situation freezer it does not freeze, and the unit itself may be hot from the sides.
A more serious situation is an interturn short circuit of the windings or jamming of the piston group of the compressor. In this case, the engine may hum but not start, or may not make any sounds at all. Diagnostics requires measuring the resistance of the windings with a tester. If the values are far from normal, replacement is necessary motor-compressor.
⚠️ Attention: Independent replacement of the compressor requires special equipment for evacuation of the system and charging with freon. Without the skills to solder copper pipes and work with refrigerant, it is better not to take risks.
Symptoms of a faulty compressor
If the compressor is hot to the touch, but does not start, it may be jammed. Attempts to run it “through the stump” can lead to final failure. Sometimes a gentle but strong blow to the housing of a running (humming) compressor helps to move the pistons, but this is a temporary measure before replacement.
Leakage of refrigerant (freon)
Refrigerant is the working fluid that transfers heat from the inner chamber to the outside. If a microcrack has formed in the system, freon gradually evaporates. Without enough gas, cooling efficiency drops to zero. A leak can occur in places where tubes are soldered, in the foamed part of the housing (due to corrosion) or in the condenser.
The main sign of a leak is the compressor running without stopping. It hums constantly, trying to gain temperature, but freezer compartment stays warm. In this case, the condenser grille at the back or on the sides may be barely warm or cold, whereas normally it should be hot. The walls inside the refrigerator may also swell.
The process of restoring the tightness looks like this:
- Searching for a leak using a leak detector or soap solution (if access is open).
- Sealing the crack or replacing the damaged section of the tube.
- Evacuation of the system to remove moisture and air.
- Refilling with new refrigerant in strict accordance with the standard.
Clogged capillary tube
The capillary tube is a thin copper channel where throttling (sharp expansion) of the refrigerant occurs. If there is moisture or oil breakdown products in the system, an ice or dirt plug may form. As a result, freon does not circulate along the circuit, and no cold is produced.
The symptoms of a blockage are similar to a leak: the compressor runs constantly or goes into thermal protection, but there is no cold. However, if you put your hand on the capacitor, you will notice that it is hot only in the first part, and then cold. The rear wall of the refrigerator may also swell.
To remove the blockage, technicians use high-pressure nitrogen purging of the system. If simple purging does not help, you have to replace the capillary tube itself. This is a labor-intensive process that requires opening the foamed part of the housing or using a technological layer.
Below is a table that helps differentiate the main malfunctions by external signs:
| Fault | Compressor behavior | Condenser temperature (rear) | Signs inside |
|---|---|---|---|
| Freon leakage | Works without stopping | Barely warm or cold | No cold, walls are dry |
| Capillary clogged | Works without stopping or knocking | Only partially hot | No cold, possible wall swelling |
| The defrost heating element is faulty | Works in normal mode | Hot | Ice coat, channels clogged |
| Thermostat failure | Does not turn on or does not turn off | Cold or very hot | Either there is no cold or everything is frozen |
Failure in the operation of the electronics and thermostat
In modern refrigerators, an electronic module monitors everything management. If one of the board elements burns out or fails thermal sensor, the command to turn on the compressor may not be received. In older models, a mechanical thermostat is responsible for this, which, if it breaks down, simply opens the contacts.
Diagnostics of electronics requires testing the circuits with a multimeter. If the thermostat is mechanical, it can be checked by closing the contacts directly. If after this the compressor starts, the reason has been found. In the case of electronics, a complete module replacement or flashing is often required, which only service center specialists can do.
It is also worth checking the integrity of the wiring. Rodents or vibration during transportation may have damaged the wires leading to the sensors or fan. Lack of contact in the evaporator temperature sensor circuit is a common reason why refrigerator “thinks” that there is already cold and does not turn on the cooling.
The influence of the external environment and load
Sometimes the reason for the lack of cold lies not in the breakdown, but in the operating conditions. If the refrigerator is placed close to the wall, air circulation around the condenser is disrupted. The unit overheats and goes into protection. Ambient temperature is also critically important: most models are not designed to work in unheated rooms at temperatures below +10°C or above +32°C.
Overloading the freezer with fresh food is another factor. If you loaded 5-10 kg of warm meat at once, compressor it may not be able to cope with such a volume of heat, especially in summer. Products in the center of the chamber may begin to thaw until the new mass freezes.
It is recommended to follow the following rules:
- 📏 Leave a gap of at least 5-10 cm from the back wall to the furniture.
- 🌡️ Do not place the refrigerator near heat sources (radiators, stoves).
- 🥩 Freeze food in portions using the “Super Freeze” mode.
- 🧹 Regularly clean the condenser grill from dust.
⚠️ Attention: Specifications and installation requirements may vary depending on the climate class of your model. Check the manufacturer's instructions to ensure that operating conditions comply with the stated standards.
Frequently asked questions (FAQ)
Why does the freezer not freeze, but the refrigerator works fine?
This is a classic sign of a malfunction No Frost systems. Most likely, the cold air supply channel is clogged with ice due to a breakdown of the defrost system (heating element, sensor or timer). It is also possible that the fan that drives air from the freezer to the refrigerator compartment may fail.
How long does it take to defrost the refrigerator if it has stopped freezing?
For complete defrosting and evaporation of moisture from hard-to-reach places, it takes at least 12 hours, and it is better to leave the unit turned off for a day. The use of hair dryers to speed up the process is not recommended, since a sharp temperature change can damage the plastic or evaporator tubes.
Is it possible to use a refrigerator if it does not freeze well?
Operating equipment in a faulty condition is not recommended. If the problem is a freon leak, the compressor will wear out, which will lead to its combustion. If the problem is in the defrosting system, water may flow inside the housing, causing corrosion and a short circuit.
What should you do if, after defrosting, the refrigerator started working, but after a week it stopped again?
This indicates a cyclic malfunction. With a 90% probability, one of the components of the automatic defrost system has failed (evaporator heating element, defrost sensor or timer). Diagnostics with a multimeter and replacement of the defective part are required.
Why is the compressor humming, but there is no cold?
If the compressor is humming, but does not start (a clicking and humming noise is heard), the problem is in the starting relay or the motor is jammed. If it works smoothly, but there is no cold, there is likely a freon leak or a clogged capillary tube.