The situation when in the refrigerator Samsung the upper chamber stops freezing, but the lower one continues to work or, conversely, heats the entire volume, is one of the most common complaints owners. Users often experience that food in the freezer compartment begins to thaw, ice turns into water, and the system stops performing its function. This can happen suddenly or develop gradually when you notice that the compressor is working without interruption, trying to achieve the set parameters. No Frost ceases to perform its function. This can happen suddenly or develop gradually when you notice that the compressor is running non-stop, trying to reach the set parameters.
The reasons for this behavior of the equipment can lie in both trivial operating errors and serious technical failures cooling systems. Modern models of the Korean brand are equipped with sophisticated electronics that control defrost and compressor operation cycles. If one of the elements of this chain fails, the circulation of cold air is disrupted, which leads to spoilage of food. It is important not to panic, but to consistently analyze the symptoms.
In this article we will analyze in detail the main reasons why the top does not freeze, consider the features of diagnosing components evaporator i compressor, and also discuss when you can handle it yourself and when calling a technician is inevitable. Understanding the principles of operation of your model will help you avoid unnecessary expenses and quickly bring the refrigerator back to life.
Operation errors and external factors
Before you start searching technical malfunctions and disassembling components refrigerator, it is necessary to exclude the simplest causes. Often the problem lies in violation of operating rules, which can be easily corrected with your own hands. First of all, check whether the temperature settings are set correctly. If you accidentally reset the settings or the “Super Freeze” mode has been running for a long time, this can lead to failures in the control algorithms.
The second critical point is the loading density and location of the products. If you pack the freezer too tightly or, more often, block the air outlets with bags, the cold simply cannot get into the upper compartment. In models Samsung with a system No Frost air is forced in, and any obstacles in its path disrupt the thermodynamics of the entire unit
ata.⚠️ Attention: Never put hot or warm foods in the refrigerator. A sharp jump in temperature forces the compressor work to wear out, and the resulting condensate instantly turns into an ice crust on the evaporator, blocking the channels.
It is also worth paying attention to the tightness of the door. If sealing rubber band the door is worn out, dirty or skewed, warm, moist air constantly enters the chamber. The system tries to cool it, but moisture settles on the walls and gradually freezes, blocking ventilation. Check whether the door fits tightly around the entire perimeter using a simple test with a sheet of paper.
No Frost defrosting system malfunctions
If external factors are excluded, the most likely reason that the top does not freeze is a failure in the automatic defrosting system. In refrigerators Samsung this process is controlled by several sensors and The defrost heating element. Over time, a “fur coat” grows on the evaporator, which is hidden behind the back wall of the freezer. In normal mode, it should thaw, but if the mechanism breaks, the ice blocks the fan and channels.
The key element here is Defrost heating element. If it burns out, the ice does not melt, and after several cycles of operation of the refrigerator, the space around the evaporator turns into a monolithic piece of ice. The fan stops spinning or starts making a lot of noise as it tries to break through the ice jam. Cold air stops flowing into the upper chamber, and the temperature there rises.
Another important component is defrost sensor (defroster). It tells the control module when to turn the heat on and when to turn it off. If the sensor “lies” or shorts, the defrost cycle may either not start at all, or, conversely, it may turn on too often, preventing the freezer from getting cold. Diagnosis of these elements requires testing the multim
test for a break or short circuit.Symptoms of defrost system malfunction
If you hear that the fan in the freezer is humming, crackling or periodically going silent, and ice is visible on the back wall, this is a sure sign of problems with defrosting. Also, an indirect sign may be that after complete defrosting (for 24 hours), the refrigerator begins to freeze normally, but after 1-2 weeks the problem returns.
The third element of the chain is fuse. It is in the heating element circuit and burns out if the heating element overheats due to a sensor malfunction. If the fuse is blown, the heating element will not turn on, even if it itself is working. Replacing these components usually solves the problem, but requires partial disassembly of the freezer.
Problems with fan and air circulation
In systems No Frost the fan is the "heart" of circulation. It is he who drives cold air from the evaporator into the upper chamber and back. If the fan stops, the cold remains below, in the evaporator area, and the main compartment becomes warm. The reasons for the stop can be mechanical or electrical.
Fan blades often freeze. This happens when the defrost system does not work correctly and moisture freezes directly on the motor axis. In this case, the engine hums, trying to start, but the impeller is blocked by ice. Sometimes complete defrosting helps, but if the problem is in the sensors, it will soon recur. It can also fail itself fan motor - the winding burns out or the bushings wear out.
- 🔇 The complete absence of noise from the fan when the compressor is on indicates an open circuit or motor combustion.
- 🌀 An intermittent hum and crackling sound indicates that the blades are touching ice or a foreign object.
- ❄️ Weak air pressure from the holes in the upper chamber indicates contamination of the channels or low rotation speed.
To check the fan in models Samsung often you need to remove the back panel freezer. Visually inspect the impeller for cracks and ice. Check ease of rotation by hand (with the refrigerator turned off). If the motor does not ring or has play in the axis, it must be replaced with an original or high-quality analogue.
☑️ Fan diagnostics
Faults in the compressor and start relay
If the fan spins, the sensors are working, but cold is not generated either in the upper or lower chambers (or is generated very weakly), the problem may lie in the main unit - compressor. This is an expensive and complex unit that circulates refrigerant throughout the system. In two-compressor models Samsung a separate motor can be responsible for the upper chamber, which simplifies localization of the problem.
A frequent breakdown is the failure of starting relay or the capacitor. In this case, the compressor tries to start, a click is heard, a hum lasts a few seconds, then another click follows and silence. The motor does not start and freon does not circulate. Replacing the relay is an inexpensive procedure and is often performed by craftsmen at home.
A more serious situation - interturn short circuit compressor windings or wedge (jamming of the piston group). If the compressor hums, is hot to the touch, but does not start even with a new relay, it most likely requires replacement. It is also possible that the compressor works, but does not create the required pressure due to wear on the valves. In this case, it works constantly, without turning off, but there is little cold.
| Symptom | Probable cause | Nature of compressor operation |
|---|---|---|
| Clicks, humming for 5-10 seconds, silence | Faulty starting relay | Starting attempts |
| Humming constantly, does not turn off | Freon leakage or wear valves | Continuous operation |
| Silent, refrigerator is warm | Open circuit or burnt out motor | Absent |
| Strong vibration and noise | Destruction of the suspension or wedge | Working with overload |
Refrigerant leak and system blockage
One of the most unpleasant reasons why the top of the refrigerator does not freeze Samsungis freon leak. Refrigerant can escape through microcracks in sealed tubes, the evaporator (especially if it is built into the wall) or in factory solder areas. If there is a partial leak, the compressor works non-stop, trying to compensate for the lack of refrigerant, but the temperature in the chambers does not drop to normal.
In models with one compressor and one circuit, a leak often leads to the fact that first the upper chamber stops freezing, and then the lower one. In dual-circuit systems (where there is a separate evaporator for the refrigeration compartment), the situation may develop differently, but the principle is the same: no pressure - no cold. It is almost impossible to determine a leak visually; you need to use leak detector or a soap solution with the casing removed.
Another problem is clogged capillary tube. In the freon circulation system, this is a bottleneck where moisture (in the form of ice) or oil oxidation products (acid plug) can get stuck. The symptoms are similar to a leak: the compressor is running, but there is no cold, and the condenser (grid at the back) may be only partially cold or warm. To eliminate this, you need to flush the system with nitrogen, replace the filter-drier and refill with new freon.
⚠️ Attention: Self-filling the refrigerator with freon without evacuating the system and replacing the filter-drier is strictly prohibited. Residual moisture in the system will lead to re-freezing and failure of the compressor within several months.
Failures in the operation of the electronic control module
Modern refrigerators Samsung are controlled by complex electronics. Control module receives signals from temperature sensors, defrost sensors and user settings, and based on these data commands the compressor and fans. If the “brains” of the refrigerator are faulty, it may not give a command to start cooling, even if all actuators are working properly.
The causes of failures can be different: power surges in the network, moisture on the board, natural wear and tear of components or a software bug. In some cases, it helps reset or a reboot (turning off the network for 15-20 minutes). However, if there are errors on the display (for example, flashing temperature indicators) or the refrigerator behaves erratically, it will likely require repair or replacement of the board.
Module diagnostics require special knowledge and equipment. The technicians check the output voltages on the compressor relay and heating element. If there is a command, but there is no execution, we look for a problem in the actuators. If there is no command when the sensors are working, the problem is in the module. In rare cases, flashing or replacing the control chip is required.
Frequently asked questions (FAQ)
How long should it take for a Samsung refrigerator to completely defrost?
To effectively eliminate the ice plug in the No Frost system, the refrigerator must be left turned off with open doors for at least 24 hours. A shorter defrosting (for example, overnight) may not melt the ice in the depths of the channels and on the hidden parts of the evaporator, which will lead to a quick return of the problem.
Is it possible to operate a refrigerator if it does not freeze the top, but works?
Short-term - yes, but not for long. If the problem is in the defrost system, the ice will continue to build up, which can lead to fan failure or deformation of plastic parts. If the cause is a freon leak, the compressor will work for wear without interruption, which can burn its windings. It is better to eliminate the problem.
Why did the refrigerator start to freeze after defrosting, but after a week it stopped again?
This is a classic symptom of a malfunction of the automatic defrosting system. Defrosting removed the ice, and the cold returned to the chamber. But since the heating element, sensor or fuse did not work, the ice began to grow again and after 5-10 days completely blocked the air circulation channels. A faulty defrost circuit element needs to be replaced.
Where is the defrost button in Samsung refrigerators?
In most household models Samsung there is no separate physical "Defrost" button. The process happens automatically. Forced defrosting can only be initiated by completely disconnecting the device from the power supply. Some premium models with a display may have a combination of buttons to reset errors or switch to service mode, but this does not replace the physical melting of ice.