The situation when you open the refrigerator door, and it’s warm there, while in the freezer the food is petrified from the cold, causes bewilderment and anxiety. This is a classic symptom that owners of equipment of different brands face, whether it be Indesit, Atlant or Samsung. Impaired refrigerant circulation or a malfunction in the defrost system leads to the fact that the cold stops flowing into the main compartment, although the compressor may continue to hum.
Understanding the operating principle will help you quickly navigate the problem. Most modern models use No Frost or a combined system, where cold is generated in an evaporator, often located in the freezer, and then a fan drives air into the refrigerator compartment. If this process is disrupted, the temperature in the upper compartment begins to rise, threatening the safety of the products.
Do not panic and immediately call a specialist, since in 30% of cases the problem is solved by simple resetting or defrosting. However, this signal cannot be ignored: prolonged operation in this mode can lead to compressor failure. In this article, we will analyze in detail the mechanical and electrical causes of the malfunction so that you can carry out an initial diagnosis.
Checking the settings and super freezing mode
Before looking for hidden technical faults, it is necessary to exclude the human factor. Often, users accidentally activate the Super Freeze (Super Freeze) mode, which is designed to quickly freeze large quantities of fresh food. In this mode, the compressor operates continuously at maximum power, cooling only the freezer compartment, while air circulation in the refrigerator compartment is blocked or limited.
Pay attention to the control panel. If the indicator with the image of a snowflake or the letter “S” is on, it means that the mode is activated. In some models, for example, u Bosch or Siemens, this mode can turn on automatically when there is a sudden power surge or a power outage, and not turn off on its own. You need to manually deactivate this function by pressing the corresponding button.
⚠️ Attention: Long-term operation in super freeze mode (more than 24 hours) leads to overheating of the compressor and excessive freezing of the evaporator, which in the future can cause serious damage to the defrost system.
It is also worth checking the temperature settings. If the regulator in the refrigerator compartment is accidentally set to minimum (value "1" or "Min"), the compressor will turn on rarely and there will not be enough cold to maintain the temperature of +2...+5°C, especially if the door is often used. Make sure that the damper that regulates the air flow is not blocked by food.
Problems with the defrost system (Defrost)
One of the most common reasons why in a two-chamber refrigerator with a system No Frost the upper chamber stops cooling is the formation of an ice plug. This occurs when the automatic defrost system fails. The heater heating elements do not turn on in time, and the evaporator becomes overgrown with ice, which completely blocks the air supply channels.
As a result, the fan continues to circulate air, but it cannot break through the ice shell to the refrigeration compartment. It can be very cold in the freezer, since the evaporator is located there, but in the main chamber the temperature rises. Often in such cases, you can hear a strange noise from the fan, which touches the frozen ice with its blades.
You can diagnose this problem by paying attention to the compressor operating cycle. If it works longer than usual or, conversely, turns on and off too often, and a thick layer of ice or frost is visible on the back wall of the freezer even after defrosting, the problem is in the defrosting units:
- ❄️ Defrost heating element - heating element, which could have burned out and stopped heating.
- 🌡️ Defrost thermostat - a sensor that does not give a command to turn on the heating.
- ⏱️ Defrost timer (or electronic module) - the “brain” of the system that could have failed and does not switch the refrigerator to defrost mode.
☑️ Actions if you suspect an ice jam
The easiest way to confirm the diagnosis is to completely defrost it. If, after 12-24 hours of inactivity with the doors open, the refrigerator worked normally and cold appeared in both chambers, but after a week or two the situation repeated itself, it means that one of the elements of the defrosting system is faulty and requires replacement.
Refrigerant leak and capillary tube clogged
If defrosting did not help and the settings are set correctly, the problem may be in freon leak or blockage. In refrigerators with a single compressor, the refrigerant first passes through the freezer, cooling it, and only then enters the refrigerator circuit. If there is a slight leak or partial blockage of the capillary tube, the freon pressure is only enough for the first circuit (freezer), and it simply does not reach the upper chamber or reaches it already warm.
A characteristic sign of a leak is that the compressor works almost non-stop, trying to gain temperature, but there is no cold in the main chamber. In this case, the compressor itself may be hot. In case of a blockage, the situation is similar, but is often accompanied by the absence of characteristic gurgling or hissing in the tubes.
| Symptom | Probable cause | Nature of the compressor operation |
|---|---|---|
| The freezer is freezing in the chamber heat | Partial leak of freon | Works without stopping |
| Frost only at the entrance to the evaporator | Clogged capillary tube | Works for a long time, hot |
| There is cold, but weak | Loss of productivity | Cyclic mode |
| Ice only in the corner of the freezer | Lack of refrigerant | Permanent working cycle |
It is impossible to eliminate a leak or blockage on your own. This requires special equipment: a vacuum pump, a pressure gauge station and a supply of refrigerant. Master must find the location of the leak (often these are foamed areas or lockings), solder the tube, replace the filter drier and refill the system.
Is it possible to drive a faulty one? refrigerator?
Transportation of a refrigerator with a freon leak is permissible only in a vertical position. However, if the compressor idles without stopping, its life is sharply reduced. It is better to turn off the device before the technician arrives.
Malfunction of the air damper
In modern models with a system Total No Frost or Multi Flow a special damper (damper) is responsible for the distribution of cold air. It is located on the border between the freezer and refrigerator compartments and opens at the command of the electronics when sensors detect an increase in temperature in the upper compartment.
If the damper is stuck in the closed position or the motor that controls it is burned out, cold air cannot physically enter the refrigerator compartment. At the same time, the freezer will be perfectly cold, and the fan may even hum, pushing air into nowhere. You can check this by getting to the air duct (usually it is located on the back wall of the refrigerator compartment).
Often the damper becomes overgrown with ice due to high humidity or a loosely closed door, which mechanically blocks its movement. In other cases, the electronics themselves fail. Replacing the damper is a simple procedure, but it requires disassembling the internal panel of the refrigerator.
Fan malfunction
The fan is the “heart” of the air circulation system in No Frost refrigerators. If it does not work, the cold remains in the freezer around the evaporator, but does not spread throughout the entire volume. The reasons for a fan stopping can be different: from banal freezing of the blades to failure of the motor winding.
To check the fan, you need to listen to the operation of the refrigerator. The moment the compressor turns on, the fan should start running after a few seconds. If you hear the hum of the motor, but there is no wind from the openings in the refrigerator compartment, the impeller may be frozen or the air duct is clogged.
In some cases, the fan may work intermittently due to a faulty door sensor. Many refrigerators are designed to stop the fan when the door is opened. If the sensor is stuck in the door open position, the fan will not start even if the door is closed. Check whether the light in the chamber lights up when opening - this is an indirect sign of the sensor’s operation.
⚠️ Attention: Do not try to lubricate the fan with oil without disassembling the engine. At low temperatures, regular oil will thicken and completely jam the mechanism. Either a complete replacement of the unit or the use of a special frost-resistant lubricant is required.
The influence of seals and opening frequency
You should not discount the condition of the rubber seals on the doors. If the seal of the refrigerator compartment is dry, cracked or dirty, it does not provide a tight seal. Warm, humid air constantly enters the chamber, which the cooling system does not have time to cool, especially if the freezer is also open at the same time.
You can check the tightness of the seal with a simple test with a sheet of paper. Clamp the sheet with the door around the perimeter. If it is removed without resistance or falls out easily, the seal is broken. In this case, the cold goes away, and the compressor works hard, but cannot cover the entire volume.
The frequency of door openings also plays an important role. If you open your refrigerator frequently or leave it open for a long time in hot weather, the temperature inside will rise sharply. The system may not be able to cope with the heat influx, creating the illusion of a breakdown, although in fact it simply does not have time to compensate for the loss of cold.
When you need to call a technician
Independent repair is possible only in cases related to defrosting, replacing a light bulb or adjusting the legs. If you are faced with a freon leak, compressor replacement, electronic module repair, or defrost heating element replacement, it is better to contact professionals. These works require qualifications and tools.
It is especially dangerous to try to solder tubes in the foamed cases of modern refrigerators yourself. Damage to the foamed part of the evaporator (which is often located in the walls of the housing) turns complex repairs into economically impractical. In such cases, it is often cheaper to buy a new refrigerator than to restore the old one.
Call a specialist if:
- 🛠️ After a complete 24-hour defrosting, the problem recurred after 3-5 days.
- 🔥 The compressor runs constantly and is very hot on touch.
- 💧 Puddles of oil or water with an unpleasant odor appeared at the bottom of the refrigerator or behind it.
- 🔌 You can hear the start relay clicking, but the compressor does not turn on.
Why is it warm in the refrigerator, but the freezer works fine?
Most often, this indicates a violation of air circulation (a clogged channel, a broken fan or damper) or a partial leak of freon, when the pressure is only sufficient for the first cooling circuit (freezer).
How long does it take to defrost the refrigerator to remove the ice plug?
For complete melting of ice in hidden channels and A minimum of 12 hours is required on the evaporator, but it is better to leave the device turned off with the doors open for 24 hours. Using a hairdryer can damage the plastic.
Is it possible to use the refrigerator if the upper chamber does not freeze?
For a short time - yes, the food in the freezer will be preserved. However, prolonged operation in this mode is harmful to the compressor, which works without rest. Food in the refrigerator compartment can spoil due to the growth of bacteria at elevated temperatures.
What does it mean if the back wall of the refrigerator compartment is covered with ice?
In drip systems ("crying wall") this is normal when the compressor is running. If the ice does not melt or turns into a fur coat, this is a sign of a malfunction of the thermostat or problems with defrosting.