The situation when food is petrified in the freezer, and the main compartment is warm or not cold enough, is one of the most common complaints from owners of household appliances. This behavior of the unit is often puzzling, since intuitively it seems that if the compressor is humming and the freezer is functioning, then the rest should work. However, in modern cooling systems, whether No Frost or drip, the cold is distributed according to complex algorithms, the violation of which leads to precisely this temperature asymmetry.
The main reason lies in the fact that refrigerant or air flows cease to flow into the upper part of the device in the required volume. This can be caused either by banal icing of the channels or by a serious technical malfunction requiring the intervention of a technician. Understanding the operating principle of your specific refrigerator will help you quickly diagnose the problem.
Before calling a technician, it is worth conducting an initial diagnosis to eliminate simple operating errors. Often, owners themselves block access to cold air or accidentally change the thermostat settings without realizing the consequences.
Impaired air circulation in the No Frost system
In refrigerators with the system No Frost cold is produced in the evaporator, which is usually located behind the back wall of the freezer. From there, the fan forces cooled air through special ducts into the refrigerator compartment. If the freezer is working normally, it means the compressor is working, but for some reason the air does not reach the upper compartment.
The most common cause is freezing of the air supply channel. This occurs because moisture in food and air freezes at the narrow junction. The ice plug physically blocks the flow, and the main chamber becomes warm, although the evaporator continues to operate. The fanfan itself, which circulates the air, could also fail.
⚠️ Attention: If you hear that the fan is humming, but not spinning, or making a grinding noise, its impeller could freeze or the motor may fail. Operation in this mode can lead to burnout of the motor winding.
Another culprit may be the damper that regulates the amount of air supplied. In electronically controlled models, it opens and closes based on sensor signals. If the mechanism is stuck in the closed position, the cold simply will not enter the chamber.
How to check the damper?
In some models, the damper is visible immediately behind the air duct opening in the fridge compartment. Try to gently move it with your hand (with the refrigerator turned off) to check if it is frozen.
Problems with refrigerant and capillary piping
If your refrigerator is of an old design or has one compressor for two chambers, but without a No Frost system, the reason may lie in freon leak or a blockage capillary tube. In such systems, the refrigerant first passes through the freezer chamber, giving up some of the cold there, and then enters the evaporator of the refrigeration compartment.
When freon leaks, the pressure in the system becomes insufficient to push the refrigerant into the second circuit (fridge compartment). As a result, all the remaining gas boils away in the freezer, cooling it, and it simply does not reach the top. This is a classic symptom when the freezer is “stone” and the refrigerator is at room temperature.
A clogged capillary tube gives a similar picture. Oil or filtrate breakdown products clog the thinnest channel, preventing circulation. In this case, the compressor can work non-stop, trying to gain temperature, but the efficiency of the system drops to zero.
| Symptom | Probable cause | Characteristic symptom |
|---|---|---|
| The freezer is freezing, the top is warm | Freon leak | The compressor is hot, works non-stop |
| Lack of cold in both chambers | Compressor breakdown | Silence or clicking, there is no cold anywhere |
| Ice only at the back wall | Malfunction of the defrost heating element | Ice freezes unevenly as a "coat" |
Malfunctions of the thermostat and sensors
The electronics of the refrigerator rely on the readings of temperature sensors. If thermostat or the air sensor of the refrigeration chamber fails and transmits incorrect data (for example, that it is already -10°C), the control module will simply not turn on the cold supply or stop the compressor, considering the task completed.
In two-chamber refrigerators with one compressor there is often one thermostat, which controls the temperature in the refrigerator compartment (or in the freezer, depending on the model). If this device “lies”, the cooling cycle is disrupted. In models with Full No Frost separate sensors can be responsible for each zone.
Often the problem lies in oxidation of the contacts or a break in the wire going to the sensor. In this case, the system may go into emergency mode, or randomly turn the cooling on and off, not allowing the products in the main chamber to cool properly.
- 🔍 Check if the temperature settings on the display are off.
- ❄️ Listen to whether the thermostat clicks when you turn the knob.
- 🔌 Make sure that the sensors are not covered by food.
The influence of super freezing and overload mode
Sometimes users accidentally activate the mode "Super Freeze" (Super Freeze). In this mode, the compressor works continuously to freeze fresh food in the freezer as quickly as possible. In some models, priority is given to the freezer compartment, and the cooling of the upper compartment is temporarily suspended or significantly weakened.
If you forget to turn off this mode after a few days, the refrigerator will continue to operate in extreme mode, which can lead to overfreezing of food at the bottom and insufficient cooling at the top due to a violation flow balance. This also leads to accelerated wear of the compressor.
In addition, a dense load of food can block the outlet openings of the air ducts. If you've just returned from the store and your shelves are packed to capacity, air circulation may have been physically disrupted. Cold air simply has nowhere to circulate.
Poor fit of the door seal
The refrigerator door opens much more often than the freezer door. Over time sealing rubber (the cuff) wears out, stretches or becomes contaminated with fat, no longer fitting tightly to the body. Through the resulting cracks, warm air from the room constantly enters the chamber.
The compressor tries to compensate for heat loss and operates continuously. However, the power of the system may not be enough to cool the constantly incoming warm air, while heat does not penetrate into the sealed freezer, and the cold remains there. This can be checked visually by holding a strip of paper against the door: if it is pulled out without resistance, the seal is broken.
⚠️ Attention: A dirty seal is a common cause of loose closure. Wipe the rubber with a soft cloth and soapy water to remove the grease film that interferes with the magnetic seal.
It is also worth checking the door hinges. If they become loose, the door may warp, and even a new rubber band will not be able to ensure a tight seal. In this case, adjustment or replacement of the hinges will be required.
Diagnostic methods and initial actions
Before you panic or look for a service center phone number, follow a number of simple steps that will help localize the problem. Often the “breakdown” turns out to be simple carelessness or a temporary failure.
First of all, completely defrost the refrigerator. Even if you have a No Frostsystem, ice may have accumulated in hidden cavities in the air ducts. Turn off the unit from the network, open the doors and leave it for at least 12-24 hours (preferably for a day). This will defrost ice plugs that could block the channels.
☑️ Action plan in the absence of cold
After turning on, let the refrigerator operate for several hours without loading food. If the temperature starts to drop, the problem is either icing or overload. If the situation has not changed, a technical malfunction is likely.
Frequently asked questions (FAQ)
Why after defrosting, the refrigerator stopped cooling again after a week?
This is a sure sign of a malfunction of the defrosting system. Most likely, it burned out, the defrost relay or defrost sensor failed. Ice has again accumulated in the evaporator and blocked the channels. The faulty part needs to be replaced. Evaporator heating element, the defrost relay or defrost sensor has failed. Ice has again accumulated in the evaporator and blocked the channels. The faulty part needs to be replaced.
Can the refrigerator not freeze due to a power surge?
Yes, a power surge could damage the electronic control module or trigger a protective mode. Try turning off the power to the refrigerator completely for 15-20 minutes, and then turning it on again. If the problem is a glitch in the electronics, this can help.
You can hear gurgling, but there is no cold - is this normal?
The sound of flowing liquid (freon) is normal for a working refrigerator. However, if it is warm in the chambers, this indicates that there is refrigerant circulation, but the efficiency of the system is impaired (leakage, substandard gas or blockage).
How can you tell that the compressor has burned out?
If the compressor tries to start, it hums for a couple of seconds and clicks, turning off, or it is silent, although it is on light inside - perhaps the problem is in the starting relay or the motor itself. A hot compressor housing while the motor is running is normal, but if it is hot beyond touching, this is a sign of overload or lack of freon.