The situation when food freezes to stone, and room temperature reigns in the refrigeration compartment, is a classic symptom of a dual-circuit system malfunction or problems with refrigerant circulation. This does not always mean a complete breakdown of the unit, but the problem cannot be ignored, since the products in the upper chamber will quickly deteriorate. Often, equipment owners do not notice this immediately, especially if the refrigerator is not fully loaded. freezer compartment Food freezes to stone while the refrigerator compartment remains at room temperature, a classic symptom of a faulty dual-circuit system or problems with refrigerant circulation. This does not always mean a complete breakdown of the unit, but the problem cannot be ignored, since the products in the upper chamber will quickly deteriorate. Often, equipment owners do not notice this immediately, especially if the refrigerator is not fully loaded.
The first thing to do when a temperature imbalance is detected is to check the operation fan (if the model is No Frost) and assess the amount of frost on the back wall. In some cases, the cause is a simple violation of operating rules, for example, installing hot pots or not closing the door tightly. However, if simple measures do not help, a more in-depth diagnosis of the nodes responsible for the distribution of cold will be required.
Understanding the operating principle of your model will help you quickly find the root of the evil. In modern units, separate evaporators or one common chamber with the air distribution system may be responsible for cooling different chambers. If the compressor operates continuously, but there is no cold in the upper compartment, it means that the freon either does not reach there physically, or the thermostat mistakenly believes that the norm has already been reached.
Checking the tightness of the door and tightness
The most common, but common reason is a violation circuit tightness. If warm air from the outside constantly enters the chamber, the system No Frost may not be able to cool it, while a freezer with a more powerful evaporator continues to freeze. Warm air contains moisture, which settles on the walls and turns into ice, blocking the channels.
Carefully inspect sealing rubber around the perimeter of the door. There should be no cracks, creases or sticky residue that would interfere with a tight fit. Often the rubber simply becomes contaminated with grease from your hands or splashes from cooking, which is why it loses its properties and stops “sticking” to the metal of the body.
⚠️ Attention: If you find that the door is skewed and does not fit tightly, do not try to forcefully slam it. This can lead to deformation of the hinges and depressurization of the system, which will require replacement of the seal.
To check the tightness, you can use a simple test with a sheet of paper. Press the door around the perimeter of the sheet and try to pull it out. If the paper comes out easily without resistance, it means it is not working in this place. Also check whether products or shelves are preventing a tight closure. seal doesn't work. Also check to see if any food or shelves are obstructing the seal.
Malfunctions of the defrost system in refrigerators No Frost
In units with a system No Frost the main reason for the lack of cold in the upper chamber when the freezer is running is often a malfunction in the defrosting system. The evaporator, located behind the rear panel, is overgrown with a “fur coat” that blocks the cold air supply channels. The fan is humming, but the air simply cannot pass through the ice monolith.
Three main elements are responsible for the defrosting process: TEN (heater), defrost sensor and timer (or electronic module). If any of these components fail, the ice does not melt, but grows with each compressor cycle. As a result, the air flow is blocked completely or partially.
You can diagnose this problem by listening to the operation of the device. If you hear the fan humming but no air is blowing from the ducts, or you see ice freezing around the doors, the defrost circuit most likely needs to be defrosted and checked. Sometimes completely defrosting the refrigerator during the day helps.
☑️ Diagnostics of the No Frost system
If after defrosting the refrigerator worked normally, but a week later the problem recurred, it means that one of the elements of the defrost system is faulty and requires replacement. Most often, it burns out itself Heating element or the sensor sticks, which does not give a command to turn on the heating.
Problems with the air circulation fan
In refrigerators like Frost Free or Total No Frost A special fan is responsible for moving cold air from the evaporator (usually located in the freezer) to the refrigerator compartment. If this unit breaks, the cold simply does not reach the upper chamber, remaining in the lower compartment.
Signs of a fan malfunction are quite obvious: either it is silent, although the compressor is running, or it makes extraneous sounds (grinding, humming), indicating destruction of the bearings. Sometimes the fan impeller is simply jammed with a piece of ice that has formed due to a leak or defrost failure.
| Symptom | Possible cause | Check method |
|---|---|---|
| The fan does not makes noise | The motor is burned out or there is no power | Ring the winding with a multimeter |
| Strong noise/hum | The bearing is broken | Visual inspection and scrolling by hand |
| The fan spins jerkily | Ice is frozen on the blades | Defrosting and inspecting the duct |
To replace or check the fan, it is often necessary to dismantle the back wall of the freezer. During assembly, it is important not to damage the wiring and install the seals correctly to avoid the re-formation of condensation and ice on the moving parts.
How to check the fan without disassembling?
Put your hand to the holes in the air ducts in the refrigerator compartment. If you do not feel even a weak air flow when the compressor is running, and it is cold in the freezer, the fan is not functioning.
Clogged capillary tube or freon leak
More serious technical problems are associated with impaired refrigerant circulation. If the system is formed clogging (for example, by oxidation products or moisture), freon cannot fully circulate through both circuits. Often in such cases, one circuit (usually the freezer) works, but the second remains warm.
Refrigerant leakage is another critical fault. When the amount of freon in the system decreases, there is not enough of it to cool both chambers. The compressor tries to compensate for the lack of cold by working without stopping, which leads to overheating of the motor and increased energy consumption.
It is almost impossible to detect a leak visually, since freon is colorless and odorless. Indirect signs are: swelling of the side walls of the refrigerator (where the condenser is sealed), the appearance of yellow oily spots at the leak site, or a characteristic whistle when the tube is broken (if the leak occurred suddenly).
⚠️ Attention: Repairing the freon circulation system (refilling, searching for leaks, replacing the filter-drier) requires special equipment and a license. It is strictly forbidden to open the circuit yourself!
If you suspect a leak or blockage, the only correct solution is to call a technician. Attempts to “supplement” the system with freon without eliminating the cause of the leak will only give a temporary effect, after which the problem will return.
Failure of the control module and sensors
Modern refrigerators are controlled electronically. If control module receives incorrect data from temperature sensors, it may mistakenly turn off the cold supply to the upper chamber. For example, if the sensor is “lying” and shows that the refrigerator is already -5°C, the compressor or valve will shut off the freon supply.
The temperature sensor of the refrigerator compartment often fails. It can be located inside the chamber or built into the wall. Replacing it is usually not difficult, but requires selecting an analogue with the correct resistance. An incorrectly selected sensor will lead to incorrect operation of the entire unit.
It is also worth checking the settings. In some models with electronic control, the program may have gone wrong or a power surge may have occurred, resetting the settings to the factory settings, where the temperature in the upper compartment is set to minimum or "vacation" mode.
To reset electronic errors, sometimes a complete reboot helps: unplug the refrigerator for 15-20 minutes, and then turn it on again. If after several hours of operation the mode has not returned to normal, diagnostics of the board or replacement of sensors will be required.
Features of single-compressor models with one evaporator
In old or budget models, where the evaporator is located only in the freezer compartment, and cold enters the upper compartment by gravity or through a damper, the problem often lies in mechanical blocking of channels. An ice plug in the channel or a sticking damper prevents cold air from rising upward.
The damper (damper) can be controlled thermomechanically or electronically. If it gets stuck in the closed position, circulation stops. In such models, it is also important to check the condition of the thermal insulation of the channel running from the freezer to the refrigerator compartment.
Sometimes the cause is excessive loading of products. If you pack the shelves so tightly that they block the air duct outlets, circulation will be physically disrupted. Products must lie freely so that air can wash them from all sides.
⚠️ Attention: Do not block the ventilation holes inside the chamber with products. This creates “heat pockets” where bacteria quickly multiply and causes the compressor to wear out.
Frequently asked questions (FAQ)
Is it possible to operate the refrigerator if the upper chamber does not work?
For a short time - yes, if the freezer is working. However, the compressor will work harder, trying to reach the temperature in the upper chamber, which will lead to overheating and increased electricity consumption. Long-term operation in this mode reduces the service life of the engine.
How long does it take to defrost the refrigerator to remove the ice plug?
For complete and high-quality defrosting, so that the ice inside the channels and on the hidden evaporator melts, the refrigerator must stand turned off for at least 24 hours with the doors open. A shorter defrosting may not eliminate the problem completely.
Why did the refrigerator stop cooling again after a week after defrosting?
This is a sure sign of a malfunction of one of the system components: the defrost heating element, sensor or timer. Ice builds up again and blocks the channels. Diagnostics and replacement of the burnt part are required.
Could the reason be in the thermostat?
Yes, if the thermostat is faulty and does not “feel” an increase in temperature, it will not give the command to turn on the compressor. Although more often, if the thermostat breaks down, the refrigerator either does not turn on at all or does not turn off.