The situation when in the main chamber your Samsung refrigerator temperature rises sharply, food begins to spoil, but the freezer section continues to freeze properly, causing panic. This is a classic symptom of poor refrigerant circulation or problems with the defrost system. Unlike older models with a single compressor, modern two-chamber units, such as Side-by-Side or two-chamber No Frosthave a complex cold air distribution system.
If you are faced with the fact that Samsung refrigerator does not freeze v top compartment, but the ice in the freezer is rock hard, which means the compressor is functioning, but the cold is not getting to where it is needed. Often the cause is a simple blockage of the channels or failure of one of the sensors, and not a breakdown of the compressor itself. It is important not to ignore the first signs so that expensive repairs are not required.
In this article we will examine in detail the main technical reasons why Samsung refrigerator ceased to maintain the required temperature in the refrigerator compartment. We will look at both simple operating errors that you can correct yourself, and complex technical malfunctions that require the intervention of a professional technician with special tools.
Problems with air circulation and the No Frost system
The most common reason why Samsung refrigerator does not cool in the main chamber when the freezer is running, lies in the system No Frost. In such models, cold air is produced by an evaporator located in the freezer compartment and is forced by a fan into the refrigerator compartment through special air ducts. If this flow is disrupted, the temperature at the top rises.
Often owners overload the shelves by placing hot pots or tightly packing food to the back wall. This blocks the duct outlets. As a result, air circulation stops, and the cold simply does not reach the upper shelves. It is enough to simply distribute the products correctly, leaving a gap at the back wall, to restore normal operation.
Also, the problem may lie in the fan itself. If the impeller is covered with ice or jammed due to a foreign object, it stops driving air. You may hear that The refrigerator is humming, but there will be no characteristic noise of a running fan. Sometimes defrosting the unit for 12-24 hours helps, which will allow the ice to melt and free the mechanism.
Particular attention should be paid to the air duct damper. This is a small motor-regulator that opens and closes at the command of the electronics, allowing cold air to pass through. If the damper is stuck in the closed position or its drive is burned out, the cold physically will not be able to get into the main chamber, even if the evaporator is covered with frost.
Faults in the defrost system and freezing of ice
The second most popular reason why Samsung refrigerator does not keep cold in the upper compartment is a failure in the automatic defrost system. In models No Frost the heating element is periodically turned on, which melts the ice on the evaporator. If one of the elements of this chain fails, ice begins to build up and blocks the air supply channels.
The main elements that require checking if a problem with defrosting is suspected:
- ❄️ Defrost heating element —a heating element that could burn out, which is why the ice does not melts.
- ❄️ Defrost sensor —a sensor that tells the control board that there is enough ice and it’s time to turn on the heating.
- ❄️ Thermal fuse —a protective device that breaks the circuit when overheated, often fails first.
- ❄️ Drain hole - can become clogged with debris or ice, which is why the water does not drain away, but freezes, forming an ice plug.
⚠️ Attention: If you observe that a “fur coat” or ice has appeared on the back wall of the refrigerator compartment, and the food warm at the top, this is a sure sign that the defrosting system is not coping. Operation in this mode leads to rapid failure of the compressor.
When the ice plug completely blocks the channels, Samsung refrigerator stops cooling. Visually this may not be noticeable, since the evaporator is hidden behind a plastic panel in the freezer. An indirect sign is that the unit works non-stop, trying to gain temperature, but to no avail.
How to check the defrost heating element?
To check the heating element, you need a multimeter. You need to remove the back panel in the freezer, get to the heater and “ring” its contacts. If the device shows a break (one or infinity), it means that the heating element has burned out and requires replacement. The resistance of a working element is usually from 200 to 400 Ohms.
Freon leak: symptoms and diagnostics
If Samsung refrigerator does not freeze in any of the chambers or it freezes weakly only in the freezer, and the top is warm, there is a high probability of a refrigerant leak. Freon is a working fluid that transfers heat. If its amount in the system has decreased due to a microcrack in the circuit, the cooling efficiency decreases.
In two-compressor models or systems with one compressor and one circuit, symptoms may differ. In systems No Frost when there is a leak, it is often the refrigeration compartment that “gets up” first, since cooling it requires less cooling capacity, and if there is a shortage of freon, there is simply not enough of it. The freezer, being closer to the evaporator, can still maintain a sub-zero temperature, but the food there may begin to thaw when fully loaded.
Signs of a freon leak:
- 📉 The compressor works continuously, without turning off, trying to compensate for the lack of cold.
- 📉 The condenser (rear grille or side walls) remains cold or warm only partially.
- 📉 In the freezer, ice freezes only at the entrance of the tubes or in one corner.
- 📉 The appearance of oily spots under the refrigerator (the leak point is often accompanied by the release of compressor oil).
It is impossible to find and eliminate the leak on your own. Special equipment is required for pressure testing the system with nitrogen, searching for microcracks and evacuation before refueling. Attempts to simply “add gas” without eliminating the cause will only lead to a temporary effect and final breakdown of the compressor.
Faults of the compressor and start relay
Although in our scenario the freezer is working, which indicates the viability of the compressor, problems with its efficiency cannot be completely ruled out. If Samsung refrigerator does not get cold, the compressor may have lost performance (compression). The pistons are worn out, and it drives freon, but does not create the required pressure.
It is also worth paying attention to the start relay. If it is burnt or stuck, the compressor may start with difficulty, hum and immediately turn off due to thermal protection. In this case, the freezer may not have time to freeze, and even less so the refrigerator. Check if the compressor housing is hot (it should be hot, but not scalding) and if there is a burning smell.
Modern Samsung models often use inverter compressors. They are quieter and more economical, but are sensitive to power surges. If the control board (inverter) fails, the compressor may not receive the correct commands to increase speed, which is why temperature in the refrigerator creeps up.
Failures in the operation of electronics and sensors
Modern Samsung refrigerator is a computer that controls physical processes. If the "brain" receives incorrect data from sensors, it makes decisions. For example, if the temperature sensor in the refrigerator compartment “lies” and shows that there is -5°C, although in fact +15°C, the control board will not turn on the cold supply.
The main electronic elements that affect cooling:
- 🔌 Temperature sensor - may have a bias characteristic or break.
- 🔌 Control module —contact oxidation or firmware failure.
- 🔌 Defrost sensor —if it is faulty, the defrost cycle may not start on time.
Often on the display (if there is one) or by flashing indicators Ice Max and other lights, the refrigerator reports an error. For example, an error code 22C or 26C may indicate problems with the refrigerator compartment sensor. The decoding of the codes can be found in the instructions or service manual.
⚠️ Attention: Resetting errors by disconnecting the refrigerator from the network for 15 minutes (reboot) can only help in case of a software failure. If the physical sensor is faulty, the error will appear again after several cycles of operation.
Table of main faults and solution methods
For ease of diagnosis, we will collect the main symptoms and probable causes in a summary table. This will help you first assess the scale of the problem before calling a technician.
| Symptom | Probable cause | Difficulty of repair | User actions |
|---|---|---|---|
| The refrigerator is humming, but not freezes, the freezer is working | Clogged air ducts, fan malfunction | Medium | Defreeze for 24 hours, check the cleanliness of the ducts |
| The compressor runs constantly, there is no cold | Freon leak, loss of compression | High | Call a technician to find the leak and refill |
| Ice on the back wall, warm at the top | Malfunction of the defrost system (heating element, sensor) | Average | Unfreeze, replace the burnt-out system element |
| Indicators are flashing, error on the display | Temperature sensor or board failure | Medium/High | Reboot, check the sensor contacts |
| The compressor clicks and does not start | The starting relay or the compressor itself is faulty | Average | Replace the start relay, diagnose the compressor |
As can be seen from the table, many problems require specialist intervention. However, correct initial diagnostics will help you avoid unnecessary costs of calling a technician to solve simple problems, such as defrosting or cleaning drainage.
☑️ Diagnostics before calling a technician
Prevention and correct operating mode
In order Samsung refrigerator to serve for a long time and not create problems with cooling, it is important to follow the operating rules. Do not place hot foods in the chamber - this creates excess humidity, which instantly turns into ice on the evaporator, loading the defrosting system.
It is recommended to carry out preventive defrosting regularly, at least once a year, even if you have No Frost. This will help clean hidden cavities from dust and microorganisms, and also check the elasticity of the seals. The door sealing rubber should fit snugly around the entire perimeter. If a sheet of paper passes through the gap, it means that the seal is broken and the cold escapes out, causing the unit to wear out.
Also keep the condenser clean (grids at the back or bottom). A layer of dust and pet hair acts as a heat insulator, preventing heat from being released. Overheating of the compressor is one of the common causes of its failure. Vacuum the back of the refrigerator at least twice a year.
⚠️ Attention: Do not use aggressive chemicals, abrasive sponges, or hot water to clean the interior chambers and seals. This can damage the plastic and rubber, which will lead to an unpleasant odor and a leak.
The myth about the "Eco" mode
Many users think that the "Eco" mode saves electricity due to less load. In fact, in this mode the refrigerator simply freezes less intensely and allows wider temperature fluctuations. For long-term storage of perishable products, it is better to use the standard mode.
When you need to call a technician
If after complete defrosting within 24 hours The Samsung refrigerator has not started to freeze, or the problem recurs a short time after switching on, professional repairs are indispensable. An independent attempt to replace the compressor or solder a leak in the foamed part of the case requires special equipment and skills.
It is especially important to contact a specialist if you hear extraneous sounds: metallic knocking, whistling or loud humming. This may indicate that the compressor is running dry or is about to seize. Delay in this case may lead to the need to replace the entire unit, since repairs may become economically unfeasible.
Remember that original Samsung spare parts and the correct freon (often a mixture of R600a, which is explosive if not filled correctly) can only be provided by authorized service centers or trusted private repairmen with a good reputation.
Frequently asked questions (FAQ)
How long should defrosting last if the refrigerator is not cold?
To completely defrost the ice in the hidden channels of the system No Frost and the evaporator, you must keep the refrigerator turned off with the doors open for at least 12 and better than 24 hours. A shorter defrosting may not solve the problem of ice jam.
Is it possible to operate the refrigerator if it does not freeze in the upper chamber?
For a short time - yes, if you transfer the food to the freezer or another place. However, operation in this mode is harmful for the compressor, which will work non-stop, trying to compensate for the lack of cold, which will lead to its overheating and breakdown.
Why does a Samsung refrigerator make a loud sound after defrosting?
This could be the sound of boiling freon in the tubes or the operation of a fan that was previously blocked by ice. If the sound does not go away after several hours of operation or is accompanied by vibration, it is worth checking the fastening of the compressor and fan.
How to understand that the defrost heating element has burned out?
Without disassembly - based on indirect signs: ice build-up in the freezer and lack of cold at the top. You can accurately determine it only by testing the resistance of the heating element with a multimeter. If the circuit is broken, the heating element is faulty.
Does the position of the refrigerator affect its operation?
Yes, if the refrigerator is tilted strongly, the oil may not return to the compressor, and the door may not fit tightly. Make sure that the unit is level by adjusting the legs, and has a slight tilt back for the doors to close themselves.