The situation when in freezer compartment products turn to stone, and in the main compartment it is warm and products spoil, is one of the most common and worrying for owners of household appliances. This is a clear sign that cooling system your unit has failed, but the compressor continues to operate normally, creating the illusion of serviceability. Most often, owners notice the problem too late, when ice begins to melt on the shelves or an unpleasant odor appears.
The main reason for this imbalance lies in the violation refrigerant circulation or air. In modern models, the cold is generated in the evaporator, which is usually located in the freezer, and then distributed to the remaining compartments. If this process is disrupted, then the source of cold (freezer) wears out, while the refrigerator compartment remains without cooling. Ignoring the problem leads to failure compressor, the repair of which will cost much more.
Before calling a technician, it is necessary to conduct an initial diagnosis to understand the scale of the disaster. In many cases, the reason lies in banal freon leak or icing of the channels, which can be detected visually or auditorily. Understanding the operating principle of your model - be it Indesit, Atlant or Bosch - will help you quickly localize the fault and avoid unnecessary expenses on diagnostics.
The principle of operation of the cooling system and cold distribution
To understand why a temperature imbalance occurs, you need to understand the physics of the process. In most modern refrigerators, especially those equipped with the No Frostsystem, cold air is produced in the evaporator, which is structurally located in the freezer compartment. Then a special fan pumps this cooled air through the air ducts into the refrigerator compartment. If the fan stops or the air duct becomes clogged, the cold stops flowing upward.
In models with drip system (crying wall) the situation is different. Here the evaporator is often hidden behind the back wall of the refrigerator compartment, but the main cooling circuit can be connected to the freezer. If there is not enough refrigerantin the system, it is only enough to cool the first section of the circuit - the freezer, and the freon simply does not reach the main compartment in the required volume and condition.
It is important to consider that temperature control carried out electronically. Thermostat or electronic sensor reads the temperature in the refrigerator compartment. If the sensor “lies” or fails, the compressor may not turn on at all or work too little, which is why the freezer still remains cold by inertia, but the refrigerator is already warm.
⚠️ Attention: If you hear that the compressor works continuously, without turning off for hours, but The temperature in the refrigerator compartment does not drop - this is a sure sign of a refrigerant leak or a clogged capillary tube. Operating equipment in this mode is dangerous for the engine.
Different manufacturers use different circulation schemes. For example, some models Liebherr use two independent circuits, and the breakdown of one does not affect the other. However, in budget models, such as Biryusa or old ZIL, the circuit is most often one, and a violation at any point leads to a global failure.
⚠️ Attention: Technical characteristics and circuitry may vary even within the same line of models of the same year of manufacture. Always check the manufacturer's official documentation before disassembling the components yourself.
Why does the freezer freeze more than usual?
In a situation where it is warm in the refrigerator and the freezer is working, the effect of “super-freezing” in the freezer compartment is often observed. This happens because the compressor, receiving a signal about a high temperature in the main compartment (or working on a timer with a faulty sensor), tries to “catch up” the cold by working non-stop. Since the main volume of cold is generated in the evaporator zone (freezer), there the temperature drops to extreme values, while the cold does not reach the refrigerator compartment due to lack of circulation or lack of freon.
Refrigerant leakage: the most common cause of the problem
The most likely cause of the situation when the freezer is working but the refrigerator is not freezing is is banal freon leak. The refrigerant circulates in a closed circuit, and if a microcrack forms in the tubes or connections, the gas begins to escape. At first, its shortage manifests itself in areas remote from the compressor or in the refrigeration compartment, since the pressure is no longer enough for a full cycle.
A leak can occur in several places: in the foamed part of the housing (internal circuit), in sealed connections or through evaporatorwhich could undergo corrosion. Often, owners themselves provoke a leak by trying to pry off frozen food with a knife or by defrosting ice with sharp objects, damaging the thin tubes of an aluminum evaporator. Symptoms of a freon leak are quite typical. The compressor works almost non-stop, trying to compensate for the lack of cold. Swelling or, conversely, areas with no heating may appear on the back wall of the refrigerator (if the door heating circuit is connected to the system). At the leak site, you can sometimes hear a characteristic hissing sound or see oily spots if you disassemble the unit. aluminum evaporator.
Symptoms of a freon leak are quite typical. The compressor works almost non-stop, trying to compensate for the lack of cold. Swelling or, conversely, areas with no heating may appear on the back wall of the refrigerator (if the door heating circuit is connected to the system). At the leak site, you can sometimes hear a characteristic hissing sound or see oily spots if you disassemble the unit.
Diagnostics of leaks at home is difficult, since freon is a colorless and odorless gas. However, there are indirect signs that will help you understand the situation before the technician arrives. Pay attention to the condition of the condenser grid at the back: if it is only partially hot or completely cold when the engine is running, it means that there is critically little gas in the system.
Malfunctions of the defrost system in No Frost refrigerators
For owners of equipment with system No Frost (or Low Frost) the situation when there is ice in the freezer and heat in the refrigerator often indicates problems with the defrosting system. In such models, cold air is pumped by a fan through special channels. Over time, a “coat” of ice accumulates on the evaporator, hidden behind a plastic panel in the freezer.
If Defrost heating element, thermal fuse or timer fail, the ice does not melt, but accumulates. As a result, the ice block completely blocks the air supply channels to the refrigerator compartment. The fan hums, trying to expel air, but physically cannot do so. In this case, it can be very cold in the freezer, since the evaporator is located there.
To check this version, just listen to the operation of the unit. If you hear the sound of a fan running, but no air is blowing from the openings into the refrigerator compartment, or it is blowing very weakly, the ducts are frozen. Another sign may be that after complete defrosting (for 24 hours), the refrigerator begins to work perfectly, but after 3-5 days the problem returns.
- ❄️ defrost heating element —a heating element that melts the ice on the evaporator; often burns out.
- ⏱️ Defrost timer (or electronic module) - gives a command to turn on the heating; may stick or burn.
- 🌡️ Defrost sensor — controls the evaporator temperature; if it “lies”, the heating will not turn on in time.
☑️ Diagnostics of the No Frost system
It is important to note that in some models, for example Samsung or LG, the sensors may not fail completely, but give incorrect readings, which is why the defrost cycle either does not start or lasts too long, defrosting the food.
Problems with the fan and clogging of the air channels
Even if everything is in order with freon and the defrost system, the cold may not enter the main chamber due to mechanical obstacles. Fan, which drives air, may simply jam due to ice, debris, or wear of the bearings getting there. In this case, the motor hums, but the impeller does not rotate or rotates very slowly.
Clogging is also common air ducts. They may contain food packaging, crumbs or ice formed due to the high humidity of the food. If the cold air supply duct is clogged, the refrigerator will be warm. If the air return channel is clogged, the cooling efficiency also drops significantly.
Sometimes the problem lies in the damper (damper), which regulates the amount of air supplied. In refrigerators with two compressors or complex electronics (for example Bosch Serie 6, Siemens), this damper is controlled by a solenoid. If the mechanism is stuck in the closed position, air will not flow into the chamber.
| Symptom | Probable cause | Check method |
|---|---|---|
| The fan does not make noise | The fan motor is burnt out or no power | Ring the winding with a multimeter |
| The fan hums, but does not spin | The impeller is jammed (ice) | Visual inspection after removing the panel |
| Air does not blow from the holes | The air duct is clogged or the damper is closed | Check the passage of the channels |
| Noise during fan operation | Bearing wear or imbalance | Listen to the nature of the noise, check the play |
To access the fan in most models Indesit i Stinol you need to dismantle the back wall of the freezer. Be careful with plastic latches, they often break at low temperatures.
Malfunction of the thermostat and electronic module
If the “brains” of the refrigerator are not working correctly, then a physically serviceable unit will not freeze. Thermostat (in mechanical models) or thermostat (in electronic) is responsible for turning the compressor on and off. If its sensitive element has shifted, oxidized or failed, it may not give a command to start the compressor, even when it is warm in the chamber.
In electronic models, control moduleis responsible for all processes. Voltage surges, moisture ingress during washing, or simply a manufacturing defect can cause a specific track or relay responsible for the refrigerator to burn out, while the freezer circuit remains operational (in dual-circuit systems). They also often “glitch” temperature sensors, transmitting false data to the module that there is already “Arctic” in the chamber.
Diagnostics of electronics requires special knowledge and equipment. However, you can notice a malfunction by the behavior of the indicators: if the alarm light is blinking, but the food is warm, or if an error is on the display, it is worth checking the sensor contacts. Sometimes it is enough to simply reboot the module by unplugging the refrigerator for 15-20 minutes.
⚠️ Attention: Before replacing the thermostat or sensors, be sure to disconnect the refrigerator from the power supply. Working with live electrical components is life-threatening and can permanently damage the control board.
It is worth noting that in some models Electrolux or Ariston sensors are located in hard-to-reach places, and to replace them you have to disassemble the entire unit, which only an experienced master can do.
Clogged capillary tube and other technical difficulties
There is another technical malfunction that manifests itself with similar symptoms - clogged capillary tube. Not only freon circulates in the system, but also special compressor oil. Over time, especially if the tightness was broken or low-quality refrigerant was used during a previous repair, a plug of oil, moisture or decay products may form in the narrow part of the tube.
When clogged, freon cannot circulate through the full cycle. The compressor pumps, the pressure rises, but the cooling capacity drops. Often in such cases, you can hear that the compressor is overloaded, gets very hot and is quickly turned off by a thermal relay, or, conversely, hums continuously without cooling.
This can only be treated by purging the system with nitrogen under high pressure and replacing filter drier. It is impossible to carry out this procedure on your own; a vacuum pump, a pressure gauge station and a supply of freon are required. Attempts to “blow out” the system with your mouth or a can of air will only lead to moisture getting inside and final breakdown.
Frequently asked questions (FAQ)
Is it possible to temporarily use the refrigerator if the freezer is working and it is warm in the main chamber?
You can only use the refrigerator in this mode for a short time until you are waiting for a craftsman or a part. However, food in the main compartment will quickly spoil. In addition, if the cause is a freon leak, running the compressor for a long time without enough oil (which is carried away by the freon) can cause it to seize. It’s better to move the food to another place.
Why did the refrigerator work after defrosting, but a week later it stopped again?
This is a classic sign of a malfunction of the defrosting system (the heating element, timer or sensor burned out) in No Frost models. Ice accumulated again and blocked the channels. This may also indicate the presence of moisture in the system (the filter drier is clogged), which freezes in a narrow place in the capillary tube, and when defrosted, thaws and releases freon again.
How much does the repair cost if you need to refill freon?
The cost consists of the work of finding a leak, soldering, and replacement filter drier and the cost of the gas itself. Depending on the model and region, the price may vary. The technician will be able to name the exact amount only after on-site diagnosis, since the scope of work greatly depends on the location of the leak.
How to understand that the compressor has burned out and not just a little freon?
If the compressor hums for 1-2 minutes, then a click is heard and it goes silent (the thermal relay turns it off), and so on in a circle - this is a sign that it cannot start or is stuck. If it works continuously for hours, it is hot, but there is no cold - most likely there is a freon leak or a blockage.