The situation when the refrigerator continues to freeze food in the freezer, but stops cooling the upper compartment, is one of the most common and alarming for owners of household appliances. You open the door, hoping to get a cold drink, but it's warm, while the ice block in the freezer remains solid. This behavior of the unit is often misleading: it seems that since the compressor is humming and the freezer is functioning, then the device is working. However, this is a classic sign of impaired refrigerant circulation or problems with the heat removal system.
It is important to understand that modern models, be it Indesit, Atlant or Samsung, use similar principles of thermoregulation. Failure to operate one unit inevitably affects the temperature regime of another. Ignoring the problem at an early stage can lead to the compressor stopping completely or burning out due to overload. In this article, we will analyze the mechanics of the process in detail and help you determine whether you can handle the breakdown yourself or whether you will need to call a technician.
⚠️ Attention: If you notice that the compressor is running continuously without turning off for hours, and the temperature in the upper chamber is rising, immediately unplug the device. Long-term operation in this mode can lead to engine wedge and expensive repairs.
The principle of operation of a two-chamber refrigerator and the role of freon
To understand why the cold stopped flowing into the refrigeration compartment, it is necessary to briefly consider the refrigerant circulation cycle. Most household models use single-compressor system. This means that one motor-compressor pumps compressed gas (freon) first into a condenser located at the rear, where the gas cools and turns into liquid.
The liquid refrigerant then enters the evaporator of the freezer, where it boils and takes away heat, creating a low temperature. After this, freon vapor passes through fridge compartment evaporator (often this is the back wall or hidden channel), where further cooling of the air occurs. Only after this the gas is returned to the compressor. If at some stage this cycle is interrupted, it is the upper compartment that suffers, since it is “second in line” to receive cold.
An imbalance can be caused by both mechanical damage and natural wear of the seals or clogging of the system. It's critical to recognize the symptoms so you don't waste money on replacing faulty parts. For example, completely replacing a compressor with a simple freon leak will not solve the problem, but will only aggravate the financial situation.
Natural defrosting: the first diagnostic step
Before grabbing tools or looking for service center contacts, it is necessary to eliminate the most commonplace, but often ignored factor - the formation of an ice plug. In systems No Frost and even in drip models (“crying effect”), the defrost system may malfunction. The defrost heating element, timer or defrost sensor may fail, causing the evaporator to become covered in ice.
This ice blocks the channels through which cold air should enter the upper chamber. Visually, you may not see the ice, since the evaporator is often hidden behind a plastic panel. At the same time, the compressor is working hard, trying to blow air through the ice monolith, but to no avail. The freezer, where the main source of cold is located, continues to freeze, and the temperature on top rises to room temperature.
☑️ Complete defrosting algorithm
The most important rule when defrosting is time. Many users wait only 2-3 hours, thinking that this is enough. However, ice in hidden channels and on the evaporator can take up to 24 hours to melt. If you turn on the unit earlier, the water will not have time to flow into the drain, it will freeze again and block the system.
⚠️ Attention: It is strictly forbidden to use a hair dryer, hot water or sharp objects to speed up defrosting. Mechanical damage to the evaporator tubes or overheating of the plastic will lead to irreversible consequences and loss of warranty.
If, after a day of defrosting and turning on again, the refrigerator worked normally for several days, and then the problem returned, it means that one of the elements of the defrosting system is faulty. Most often this is an evaporator heating element or a defrost sensor. In this case, professional diagnostics with a multimeter is required.
Refrigerant leakage: signs and consequences
One of the most serious reasons why the refrigerator stops freezing in the upper compartment is freon leak. The refrigerant circulates in a closed circuit, and in a working device its quantity does not change for years. However, metal corrosion, vibration or manufacturing defects in soldering can lead to the appearance of microcracks. Since freon is a gas, it simply evaporates into the atmosphere.
Leak symptoms appear gradually. At first, the refrigerator begins to freeze worse, the compressor works longer to compensate for the lack of cooling capacity. Then the cold disappears in the upper chamber, since the freon pressure is not enough to complete the entire cycle. The freezer can maintain the temperature for some time due to residual refrigerant and good thermal insulation, but soon it will stop working.
Where does a leak most often occur?
Most often, freon leaves through a foamed circuit (pipes inside the housing), through an aluminum evaporator in models with a “crying” wall (due to corrosion from moisture) or through the solder joints of the capacitor. Finding a leak in the foamed part requires complex equipment and is often not economically feasible.
It is impossible to diagnose a leak visually. You won't see any holes or hissing. An indirect sign may be swelling of the inner wall of the refrigerator compartment (in models with a foamed evaporator) or the appearance of rust on the rear grille. Also, condensation may stop forming on the compressor tubes.
Repair in case of a leak consists of finding the place of damage, sealing it and filling the system with freon. If the leak occurs in the foamed part of the housing, craftsmen often suggest installing an external “crying” evaporator inside the chamber, which is a reliable, but less aesthetic solution.
Clogged capillary tube: mechanical blockage
The third common reason for the lack of cold in the upper compartment — clogged capillary tube. This is a narrow copper tube through which liquid freon is supplied to the evaporator. The diameter of its hole is extremely small, so even a microscopic particle of debris, a piece of oxide or a clot of oil can completely block the flow of refrigerant.
When clogged, the compressor continues to hum, trying to push gas, but circulation does not occur. The pressure in the system is distributed unevenly: before the blockage it is high, after it is low. As a result, the evaporator does not cool, and cold does not enter either the freezer or the refrigerator compartment, although sometimes local freezing may be observed at the site of the blockage.
| Symptom | Probable cause | Necessary actions |
|---|---|---|
| The compressor is hot, runs non-stop | Clogging or leakage | Checking the pressure in the system |
| The refrigerator turns off, but does not freeze | Thermostat malfunction | Replacing the temperature sensor |
| Audible gurgling or hissing | Normal operation or leakage | Observation during the day |
| Ice only in the corner of the freezer | Capillary blockage | Purge the system with nitrogen |
To remove the blockage, the master connects a special press, creates high pressure or uses nitrogen to purge the system. Often it is necessary to replace the filter drier, which is designed to trap moisture and debris. It is impossible to carry out this procedure independently without a vacuum pump and a pressure gauge station.
Malfunctions of the thermostat and electronics
In simpler models of refrigerators, the mechanical one is responsible for the temperature thermostat. This is a device that closes and opens the compressor power circuit depending on the temperature in the chamber. If its sensitive element (bellows) fails or is displaced, the compressor may not turn on at all or, conversely, work continuously.
However, in modern models with electronic control (for example, LG, Bosch), the control function is performed by the main control module and temperature sensors. If one of the sensors (usually there are two: in the refrigerator and freezer compartments) transmits incorrect data, the “brain” of the refrigerator may decide not to turn on the compressor or not open the air supply damper.
Often the problem lies in oxidation of the contacts or a break in the wiring going to the sensor. This can be seen visually when disassembling the control panel if you have skills in working with electrical circuits. Replacing the sensor is an inexpensive and quick procedure.
It is worth noting that electronic modules are sensitive to power surges in the network. If the lights in your home flicker frequently, it is recommended to use a stabilizer. A burnt-out control unit is one of the most expensive breakdowns, requiring flashing or replacement of the board.
Problems with seals and heat transfer
You should not discount the physical condition of the refrigerator itself. If sealing rubber band the refrigerator door has become unusable, warm air from the room constantly enters the gap. The compressor tries to compensate for the heat by working without interruption, but due to the constant flow of heat, the temperature inside does not drop to the required values.
You can check the tightness in a simple way: hold a sheet of paper with the door and try to pull it out. If the paper comes out easily without resistance around the entire perimeter, then the seal is not tight. The reason may also be that the door is skewed due to worn hinges or overloaded shelves.
In addition, the location of the refrigerator plays an important role. If it is placed close to a wall or in a niche where the air circulation around the condenser (the grille at the back) is disrupted, the cooling efficiency decreases. The compressor overheats and can be switched off due to thermal protection without cooling the upper chamber.
⚠️ Attention: The back wall of the refrigerator must be at least 5-7 cm from the wall. Violation of this rule leads to overheating of the compressor and premature failure.
When you need to call a specialist
To summarize, we can identify situations where independent repair is not only useless, but also dangerous. If defrosting for 24 hours did not help, and you hear that the compressor is running, but there is no cold, most likely there is a problem in the refrigerant circulation system (leak, blockage). This requires specialized equipment.
You also need professional help if you hear unusual sounds (metallic knocking, strong buzzing), smell burnt wiring, or see sparking. Interfering with the electrical part without appropriate qualifications can result in electric shock.
Remember that modern refrigerators are complex technical devices. An attempt to “save” by calling a repairman in the event of a serious breakdown often results in the purchase of a new unit. Timely diagnostics can extend the life of equipment for many years.
How much does a repair cost?
The cost of repairs consists of diagnostics, the cost of spare parts (freon, filter, sensor) and the complexity of the work. Refilling with freon and finding the leak usually costs more than replacing the thermostat. The exact price can be found out only after inspection.
FAQ: Frequently asked questions
Why, after defrosting, did the refrigerator stop freezing again after 2 days?
This is a sure sign of a malfunction of the defrosting system. Most likely, the heating element of the evaporator burned out, or the defrost sensor or timer failed. Ice accumulated again and blocked the channels. The faulty element needs to be replaced.
Is it possible to use the refrigerator if the upper chamber does not freeze?
For a short time - it is possible, but not recommended. The compressor will work non-stop, which will lead to overheating and combustion. In addition, the food in the upper chamber may spoil.
How to check if there is freon in the refrigerator?
Without a pressure gauge, it is impossible to accurately determine the amount of freon. An indirect sign - if, when the compressor is running, the side walls or the condenser at the back remain cold (barely warm) and do not heat up evenly, perhaps there is not enough freon.
Why is there ice in the freezer, but warm in the refrigerator?
Most often this indicates a clogged capillary tube or a freon leak. The circulation of the refrigerant is disrupted and there is not enough of it for the full cooling cycle of both compartments. It is also possible for air ducts to freeze in No Frost systems.