The situation when, instead of fresh vegetables and chilled milk, you find ice blocks in the chamber, and the meat is covered with crystals, is familiar to many owners of household appliances. This is not just inconvenience, it is a direct signal that operating mode of the compressor has been broken and the system has stopped correctly regulating the temperature balance inside the compartment. Often, users mistakenly believe that the problem lies solely in the quality of the products themselves or infrequent defrosting, ignoring deeper technical faults.
In fact, excessive freezing of moisture from the products and the formation of ice indicate that refrigeration unit works in an enhanced mode, without receiving a command to stop. This can be caused either by a simple error in the settings, or by failure of the sensors or a violation of the system’s tightness. Understanding why the refrigerator is very coldwill help avoid inventory damage and costly repairs in the future.
In this article we will analyze in detail the main reasons, from simple adjustments to complex breakdowns, and give step-by-step diagnostic instructions. You will learn to distinguish when it is enough to simply turn the regulator knob, and when you need to call a technician to replace thermostat or look for a refrigerant leak.
Incorrect temperature setting
The most commonplace, but common reason is human factor. If you have a mechanically controlled model, that is, with a rotary knob inside the chamber, an accidental shift of the regulator to maximum could easily occur when loading products. In such systems, the numbers on the scale do not indicate degrees Celsius, they indicate cooling intensitywhere the maximum value causes the compressor to work almost without interruption.
In modern models with an electronic display, the situation may be different. The “Super Freeze” or “Fast Freeze” function is often found here, which forcibly keeps the temperature at -24°C or lower for a certain time. If you activated this option to quickly cool a large batch of meat, but forgot to turn it off, refrigerator compartment turns into a freezer. It is also worth checking whether the settings have been lost after a power surge.
It is important to understand that the location of the thermostat or sensor affects its operation. If you have just placed a hot pan or tightly packed the shelves at the back wall, the sensor may “think” that the chamber is warm and give a command for increased cooling, although the rest of the volume is already cold.
⚠️ Attention: Do not set the control of a mechanical refrigerator to maximum (usually the number 5 or 7) for constant operation. This leads to freezing of the evaporator and overload of the compressor, which shortens the service life of the equipment.
Malfunction of the thermostat or temperature sensor
If the settings are normal, but the food continues to freeze, most likely the main “brain” of the control system has failed - thermostat (in mechanical models) or temperature sensor (in electronic models). The task of this element is to read the temperature inside the chamber and open the electrical circuit when a specified threshold is reached. If damaged, the contacts can “stick” in a closed state, which is why refrigerator compressor receives current continuously and drives cold without stopping.
In models with the No Frost system, several sensors are responsible for the temperature regime: one controls the air in the chamber, the other controls the temperature of the evaporator. If the evaporator sensor “lies” and shows that the ice has not melted or the temperature is insufficient, the controller will keep the compressor on. Replacing these elements requires disassembling the inner lining and using a multimeter to check the resistance.
Symptoms of a sensor malfunction are often accompanied by other anomalies: the refrigerator can freeze very hard, but not turn off for hours, or operate in jerks. In electronic models, error codes may light up on the display, indicating an open circuit in the sensor.
☑️ Thermostat diagnostics
Refrigerant leak and problems with the capillary
Paradoxically, a freon leak often leads to the fact that it becomes too cold in one of the chambers (usually the refrigerator) and warm in the other (the freezer), or vice versa, depending on the design of the evaporator. When the amount of refrigerant in the system decreases the pressure drops, and the boiling point of freon in the evaporator becomes lower than the calculated one. As a result, the evaporator freezes over with a “coat” of ice, and the fan blows this cold throughout the chamber, freezing the food at the back wall.
Another technical reason is a clogged capillary tube or a malfunction of the drying filter. The refrigerant cannot circulate freely, causing pressure surges. In such cases, the effect of a “crying evaporator” is often observed, when ice forms unevenly, in pieces, and the temperature at different points in the chamber is very different.
Diagnosing a leak or blockage at home is almost impossible without special equipment. The technician uses a leak detector or the method of immersion in water (for removed components), and also controls the pressure in the system with a pressure gauge station.
| Symptom | Probable cause | Nature of compressor operation |
|---|---|---|
| Ice only at the rear wall | Freon leak / Clogged | Works for a long time, short pauses |
| Ice around the entire perimeter | Thermostat is faulty | Works continuously |
| The products are dry, a lot of frost | The door is not closed tightly | Operation cycles are frequent |
| Intense cold + noise | Problems with the fan | Depends on the model |
Is it possible to refill the refrigerator with freon yourself?
Refilling it yourself is highly not recommended. This requires evacuation of the system (removing moisture and air with a pump) and accurate dosage of gas on a scale. An attempt to refuel “by eye” from a spray can will lead to a quick breakdown of the compressor or an explosion of the system due to hydraulic shock with liquid freon.
Violation of the chamber seal and fan operation
The constant flow of warm, moist air from the room is another enemy of the correct microclimate. If sealing rubber the door is worn out, dirty or the door is warped, the tightness is broken. Moisture enters the chamber, which instantly freezes on the coldest element - the evaporator. The No Frost system, trying to compensate for the heat, can work more intensely, and the fan will actively disperse this cold air, drying the food.
In systems with forced air circulation (No Frost), the fan is responsible for distributing the cold. If the duct damper that regulates the flow of cold air from the freezer to the refrigerator compartment is stuck open, excess cold will flow into the upper chamber. This is a common problem with dual-circuit systems, where one compressor serves both chambers.
Check the door hinges: if they are loose, the door may not fit tightly even with the rubber band intact. Also pay attention to the cleanliness of the rubber itself - greasy deposits or crumbs do not allow it to close tightly.
The influence of the location of products and chamber loading
Proper air circulation is critical for uniform cooling. If you have packed the shelves, blocking the cold air outlets (usually located on the back wall or on the shelves), the temperature sensor may not “feel” the actual cold in the chamber. It will give a command to cool, while it is warm right next to the sensor, and an ice crust has already formed at the back wall.
Liquid products in open containers and vegetables are especially sensitive to this. If you place a pot of soup close to the back wall, it will freeze in a matter of hours. In areas of intense airflow (usually the upper shelves and the space near the back wall), the temperature is always lower than in the door pockets or on the lower tiers.
Try to leave a gap of 2-3 centimeters between the products and the back wall. This will ensure proper operation cold removal systems and prevent local freezing.
⚠️ Attention: Never put hot or warm food in the refrigerator. This will not only cause the formation of ice, but will also cause the compressor to wear out, which can lead to its overheating and breakdown.
Failures in the operation of the electronics and control board
In modern models such as LG, Samsung, Bosch or Indesit with electronic control, the control module is responsible for all processes. Power surges, moisture, or manufacturing defects can cause the board to glitch. Electronics can send incorrect signals to actuators, ignoring sensor readings.
Sometimes the problem is solved by a simple reboot: disconnecting the refrigerator from the network for 15-20 minutes. This allows you to reset errors in the controller memory. If after switching on the situation repeats, it is likely that the module will need to be re-flashed or completely replaced.
It is also worth checking the integrity of the wiring. Rodents or mechanical damage during transportation could disrupt the contact in the sensor circuit, which is why the board receives a “too warm” signal, and it triggers active freezing.
Frequently asked questions (FAQ)
Why does the refrigerator freeze a lot, but does not turn off?
This is a classic sign of a faulty thermostat or temperature sensor. The element responsible for turning off the compressor is “stuck” or transmits incorrect data about the temperature inside the chamber. A freon leak is also possible, due to which the system cannot gain the required pressure to stop.
Is it possible to operate a refrigerator if it freezes food?
For a short time - yes, if you set the minimum temperature. However, prolonged operation in this mode leads to freezing of the evaporator, which blocks ventilation (in No Frost) and forces the compressor to work without rest. This significantly reduces the life of the motor and increases energy consumption.
How to adjust the temperature if there are no numbers, only dots or marks?
Usually the middle position of the regulator (or one point out of three/five) corresponds to the factory settings (about +4...+5°C). If the refrigerator freezes too much, turn the knob towards the minimum (lower number or counterclockwise). Wait 24 hours for the temperature to stabilize before checking again.
Does the time of year affect freezing?
Yes, indirectly. In summer, when the room is hot, the refrigerator works harder. If at the same time you have the “Super Freeze” mode or the thermostat is faulty, the freezing effect will be more noticeable. In winter, at low temperatures in the room, equipment may work less often, but problems with sensors will not go away.