The situation when the refrigerator Samsung stops maintaining the required temperature in the upper compartment often takes you by surprise. Below, food can remain frozen, while the refrigerator compartment is warm or, conversely, an ice crust forms. This is a classic sign of a violation of cold air circulation or a malfunction in the climate control system.
Modern units of the Korean brand are equipped with complex electronics and systems No Frost, which makes them vulnerable to voltage surges and natural wear of parts. Before calling a technician, it is worth carrying out an initial diagnosis, which in 30% of cases allows you to identify and fix the problem yourself without expensive intervention.
In this article we will analyze in detail the mechanical and electrical reasons for the lack of cold. You will learn how to check the operation of the fan, assess the condition of the defrost heating element and understand when you need to call a specialist to refill with freon.
The main reasons for the lack of cold in the upper compartment
The most common reason that Samsung stopped freezing from above is a violation of air circulation. In systems No Frost cold is generated in the freezer and is forced by a fan into the refrigeration compartment through special channels. If this process is interrupted, the temperature at the top increases.
The second most popular reason is the failure of one of the temperature sensors. The electronic control module relies on sensor readings to start the compressor or enable defrost. If the sensor is “lying,” the brains of the refrigerator may think that the temperature in the chamber is already -10 degrees, and not turn on the cooling.
⚠️ Attention: If you hear the hum of the compressor, but there is no cold, under no circumstances try to immediately disassemble the back wall without unplugging the appliance for 10-12 hours. This is necessary to defrost ice that may block ventilation.
It is also worth considering the possibility of a refrigerant leak. Although this less often leads to a complete absence of cold in only one chamber, when the freon level is low, the evaporator does not have time to cool enough for the fan to reach the desired temperature in the upper compartment.
Problems with the defrost and ventilation system
System No Frost requires periodic defrosting of the evaporator. A timer, heating element and defrost sensor are responsible for this process. If any of these elements fails, a “coat” of ice builds up on the evaporator. This ice blocks the air channels, and the cold simply cannot enter the upper chamber.
The fan is the heart of the circulation. If it is jammed with ice or the motor winding is burned out, air remains in the freezer. You can check its operation by opening the refrigerator door and holding the door switch (simulating a closed door). If the fan does not hum after a couple of minutes, there is a problem with it or with the voltage supply.
- 🔹 Malfunction of the defrost heating element: the heating element burns out and does not melt the ice on the evaporator, blocking the airflow.
- 🔹 Sticky defrost sensor: the sensor does not give a command to turn on the heater, even when the ice is already increase.
- 🔹 Timer failure: the control module is “stuck” in the cooling mode and does not start the defrosting cycle.
Often owners are faced with a situation where after defrosting the refrigerator works for a day, and then the problem returns. This is a sure sign that the defrosting system is not functioning correctly and ice is again blocking the channels.
☑️ Diagnostics of the defrosting system
Faults of sensors and electronic module
Modern ones Samsung are stuffed with electronics. Separate sensors are responsible for the temperature in different zones. If the refrigerator compartment sensor shows incorrect data (for example, it underestimates the actual temperature), the compressor will work less than necessary or turn on rarely.
The control module may also malfunction due to power surges in the network. In this case, the relay responsible for supplying power to the compressor or fan may not complete the circuit. Diagnostics requires testing the contacts and checking the output voltages.
| Component | Fault symptom | Test method |
|---|---|---|
| Refrigeration chamber sensor | Temperature above normal, compressor worth | Resistance measurement at different temperatures |
| Evaporator sensor | Ice build-up, defrosting error | Visual inspection, continuity |
| Fan | Noise, lack of rotation, cold only at the bottom | Checking rotation manually, measuring voltage |
| Control module | Chaotic operation, lack of response to commands | Visual inspection of the board, checking the relay |
To replace sensors, partial disassembly of the internal panel is often required.
How to check a sensor with a multimeter?
To check the temperature sensor, you need to remove it and connect the multimeter probes in resistance (Ohms) measurement mode. At room temperature, a working sensor usually shows a resistance in the range of 2-10 kOhm (depending on the model). If the device shows an open circuit (infinity) or a short circuit (0 Ohm), the sensor is faulty. You can also heat the sensor in your hands: the resistance should change smoothly.
Freon leak and problems with the compressor
If the fan is humming, the sensors are working, but there is no cold in any chamber or it is very weak, a refrigerant leak is likely. In two-chamber models Samsung with one compressor, when freon leaks, it is usually the upper compartment that stops freezing first, since the refrigerant simply does not reach it in the required volume.
The compressor is a motor-pump. If it hums but does not start (you can hear a clicking and humming noise), the thermal protection relay may have tripped or the start protection mechanism has failed. In more severe cases, the compressor itself must be replaced, which is an expensive procedure.
⚠️ Attention: Self-filling the refrigerator with freon is prohibited by law and requires special equipment (vacuum pump, pressure gauge station). An attempt to add gas “by eye” will lead to damage to the compressor.
Signs of a leak can also be swelling on the walls of the refrigerator (where the perimeter heating circuit is sealed) or oily spots on the floor under the rear grille. If you notice oil, the tightness of the system is broken.
Mechanical damage and blockages of the capillary
The capillary tube is a thin channel through which freon enters the evaporator. Over time or due to contamination of the system, it can become clogged. The blockage can be “ice” (moisture entering the system) or “oil” (oil oxidation products). As a result, the circulation of the refrigerant stops.
Mechanical damage often occurs due to careless defrosting with a knife. If you puncture the evaporator wall, the freon will instantly escape. Repair in this case is complicated: sealing the hole, vacuuming and refilling is required.
- 🔸 Ice plug: occurs due to moisture in the system, is treated by purging with nitrogen and replacing the filter drier.
- 🔸 Clogged filter-drier: the filter becomes clogged with decay products, requiring replacement unit.
- 🔸 Deformation of the tubes: pinching of the capillary during transportation or installation.
It is almost impossible to diagnose a blockage at home without pressure gauges. An indirect sign is that the compressor works continuously, trying to gain temperature, but the condenser (grid at the back) remains only partially cold or warm.
Operating rules for preventing breakdowns
In order for the upper chamber of your Samsung to work properly for many years, it is important to follow the operating rules. Do not put hot food in the refrigerator - this creates excess moisture, which turns into ice and blocks ventilation.
Check the rubber seals on the doors regularly. If they do not fit tightly, warm, moist air enters the chamber, causing the system to wear out. Wipe the elastic bands with a soft cloth and check their elasticity.
Do not overload the shelves with products so that they block the air ducts. Cold air should circulate freely. It is especially important not to close the holes on the back wall of the refrigerator compartment.
When it is necessary to call a specialist
There are a number of situations when independent repair is not possible only useless, but also dangerous. If you have checked the ventilation, sensors and made sure that the compressor turns on, but there is no cold, most likely the problem is a hidden leak or blockage.
You also need professional help if you need to replace the compressor or complex repair of the control module electronics. These components require specific knowledge, tools and original spare parts.
Remember that incorrect diagnosis can lead to higher repair costs. For example, trying to replace the sensor when there is a real freon leak will only waste your time, and the problem will not go away.
Why is it warm in the upper chamber, but everything below is frozen?
This is a classic symptom of a malfunction of the air circulation system. In Samsung refrigerators with a single compressor, the cold is produced in the freezer compartment (bottom or top, depending on the model, but often the evaporator is hidden). The fan should drive this cold into the refrigerator compartment. If the fan is broken, jammed with ice or the air ducts are blocked, the cold remains at the bottom, and the temperature rises at the top.
How to defrost a Samsung refrigerator correctly?
For proper defrosting, unplug the device, open all doors and leave it for at least 12 hours (preferably for a day). Do not use hair dryers or hot water to speed things up - this may damage the plastic and tubing. Place rags to catch water. After defrosting, wipe the camera dry before turning it on.
What does the flashing temperature indicator mean?
A flashing indicator or error code (for example, 22E, 24E, 40E) on the Samsung display indicates a specific malfunction. Often this is a temperature sensor or fan error. The decoding of the code can be found in the instructions or by refrigerator model in the service manuals.
Is it possible to operate the refrigerator if the top does not freeze?
For a short time - yes, food can be transferred to the lower part or use cooler bags. However, long-term operation with a faulty defrost system or freon leak will lead to overload and eventual combustion of the compressor, which will make repairs economically unfeasible.
How often do you need to change the filter drier?
The filter drier is changed every time the refrigerant circuit is opened (in the event of a leak, replacement compressor or clearing the blockage). This is a disposable item and cannot be refurbished or cleaned. Its replacement is mandatory for high-quality operation of the system.