The situation when a Samsung refrigerator stops freezing in the upper compartment, but the lower chamber continues to work normally, often takes the owner by surprise. This is a common problem for models with a system No Frostwhere cold air circulation is forced. If you notice that the food in the freezer has begun to thaw, and there is no frost on the back wall or, conversely, a thick layer of ice has formed, you cannot ignore this.
The root cause most often becomes a violation of air circulation or a malfunction of one of the key components of the cooling system. Unlike older models with a drip system, here complex electronics and mechanical components are responsible for the temperature. Samsung equips its units with sensors that can block the operation of the compressor at the slightest deviation from the norm, which requires careful diagnostics.
Before calling a technician, it is worth conducting an initial visual inspection and exclude trivial factors, such as a loose door or incorrect temperature settings. However, if simple measures do not help, the problem lies deeper. In this article we will analyze in detail the technical aspects of malfunctions and methods for eliminating them.
No Frost system and features of air circulation
Understanding the principle of operation of the system No Frost ("no frost") is critical for troubleshooting. In Samsung refrigerators, cold air is not produced separately in each chamber. It is generated in a special compartment, usually located behind the back panel of the freezer, and then distributed to all compartments through an air duct system.
The evaporator i fanis responsible for this process. The fan forces air through the cold evaporator, after which the cooled streams enter the freezer, and from there, passing through the dampers, enter the upper refrigerator compartment. If this cycle is disrupted, the upper chamber stops receiving cold, even if the compressor is humming.
Often owners mistakenly believe that since the compressor is working, it means there is freon in the system. However, if the air ducts are clogged with ice or the fan is not working, the cold simply does not reach the upper shelves. That is why it is important to distinguish between the lack of cold due to a gas leak and the lack of cold due to mechanical blockage of flows.
⚠️ Attention: Attempts to defrost the refrigerator with a hairdryer or boiling water can damage plastic elements and sensors. Use only natural defrosting within 24 hours.
The key element here is the defrosting system. If it does not work, the evaporator becomes overgrown with a “fur coat”, which blocks the access of air. The fan begins to hum or stops, resting its blades on the ice crust. This is the most common reason why the upper chamber does not work.
Malfunctions of the defrosting system: heating element, timer and sensors
The automatic defrosting system in Samsung refrigerators consists of several interconnected components. If one of them fails, the defrost process does not start and the evaporator turns into a monolithic piece of ice. The main elements are defrost heating element, defrost sensor and a control relay or timer.
The heating element (tubular electric heater) is located directly under the evaporator. Its task is to heat up at certain intervals and melt frozen frost. If the heating element burns out, the ice does not melt, the channels become clogged, and cold air stops flowing into the upper chamber. You can check its integrity with a multimeter by measuring the resistance.
The defrost sensor (thermostat) controls the temperature of the evaporator. It gives the command to turn on the heating element when the temperature drops below normal, and turns off the heating when the ice has melted. If the sensor is “stuck” in the “on” position, the heating element can heat constantly, or vice versa - never turn on, which leads to icing.
How to check the heating element with a multimeter?
To check the heating element, you need to remove the back panel of the freezer, disconnect the heater contacts and switch the multimeter to resistance measurement mode. If the device shows infinity (break), the heating element is faulty and requires replacement. Normal resistance is usually from 200 to 400 Ohms.
It is also worth mentioning the fuse, which is often paired with a heating element. It burns out when the system overheats, opening the circuit. Replacing the heating element without replacing the fuse in such cases is useless.
Problems with the fan and air control damper
The fan is the “heart” of circulation in the No Frost system. It is this that creates the pressure necessary to move cold air from the freezer to the upper compartment. If the fan stops, the freezer will remain cold for some time due to static air, but in the upper compartment the temperature will quickly rise.
The reasons for the fan stopping can be different:
- ❄️ Freezing of the blades: ice blocks rotation, the motor hums, but does not spin.
- 🔌 Failure of the electric motor: the winding is burned out or the bearings are worn out.
- ❄️ Malfunction of the door sensor: in many Samsung models, the fan turns off when you open the door. If the sensor is stuck or broken, the system “thinks” that the door is open and stops the airflow.
The air control damper (damper) is another important component. It is located at the entrance of the air duct to the refrigeration compartment and opens or closes at the command of the electronics, regulating the amount of incoming cold. If the damper is stuck in the closed position, the upper chamber will remain warm.
Diagnostics of the damper often requires disassembling the top of the refrigerator. Mechanical damage to the curtain or failure of the drive motor leads to the fact that the air simply does not pass further than the freezer.
In some models, the damper is electronically controlled, and its position can be checked through the service menu, but this requires special knowledge and access to the engineering mode.
Freon leakage and malfunctions compressor
Although a refrigerant (freon) leak more often leads to a complete failure of the refrigerator, in the initial stages a situation may be observed when the freezer is still freezing, but the upper compartment is warm. This is due to the fact that the freezer requires less refrigerant to maintain low temperatures than to provide cold throughout the entire volume.
Signs of a freon leak:
- 📉 The compressor runs continuously, without turning off, trying to gain temperature.
- 🌡️ Condenser (grid at the back) warm only partially or completely cold.
- ❄️ Only slight cold or frost appears in the freezer only at the entrance to the evaporator.
A compressor malfunction can also manifest itself strangely. If it loses performance (for example, due to failed valves), the pressure in the system is not enough to pump freon through the entire circuit, and the cold goes only to the first consumer - the freezer.
It is important to understand that diagnosing leaks or problems with the compressor at home is extremely difficult and requires special equipment (pressure gauges, leak detectors). In this case, independent repair is impossible and requires calling a specialist.
Electronic failures and temperature sensors
Modern Samsung refrigerators are controlled complex electronics. Temperature conditions are controlled by sensors located at different points: in the freezer, in the refrigerator compartment, on the evaporator. If one of the sensors gives incorrect readings, the “brain” of the refrigerator may decide not to turn on the cooling.
For example, if the sensor in the upper chamber “lies” and shows that it is -5°C, although in fact it is +15°C, the compressor will not turn on. Often such failures are accompanied by the appearance of error codes on the display.
Common temperature-related Samsung error codes:
| Error code | Problem description | Probable cause |
|---|---|---|
| 22C / 22E | Sensor error refrigerator compartment | Sensor malfunction or open circuit |
| 21C / 21E | Freezer sensor error | Temperature sensor malfunction |
| 23C / 23E | Defrost sensor error | Defrost sensor malfunction |
| 39C | Ice maker sensor error | Problems with the ice maker system (if any) |
The electronic control module can also fail due to power surges. In this case, it may not control the dampers or compressor correctly. Sometimes a reboot (resetting errors) helps, but if a part is damaged, the board will need to be replaced.
Diagnostics and step-by-step instructions for testing
If you decide to carry out diagnostics yourself, start with the simplest and safest method - complete defrosting. This action allows you to eliminate the problem with icing of the No Frost system, which accounts for up to 70% of all cases of “warm” top.
Procedure for defrosting:
- Unplug the refrigerator.
- Remove all food and shelves.
- Leave the doors open for at least 24 hours (preferably a day).
- Place rags, as there will be a lot of water.
- Turn on the refrigerator empty and check the operation after 5-6 hours.
If after defrosting the upper chamber starts working, but after 1-2 weeks there is a problem returned, which means the defrosting system (heating element, sensor or timer) is faulty. If defrosting did not help and the upper chamber remained warm, you will have to look deeper for the cause.
☑️ Primary diagnostic checklist
To check the sensors and heating element, you will need a multimeter. You need to get to the back wall of the freezer (remove the plastic panel). Visually inspect the evaporator: if it is covered with ice and the fan is clean, the defrost is not working. If the evaporator is clean, but there is no cold, the problem is in the leak or compressor.
⚠️ Attention: When disassembling the plastic panels inside the freezer, be extremely careful. Plastic becomes brittle in the cold and breaks easily. Let it warm up before removing the fasteners.
When you need to call a technician
Independent repair is only possible if you replace simple elements, such as heating elements, sensors or a fan, if you have skills in working with electricians and tools. However, there are situations when you cannot do without a specialist.
Be sure to call a specialist if:
- 🛠️ The circuit needs to be opened (compressor replacement, leak detection, freon charging).
- 🛠️ The electronic control module is faulty (reflashing or complex soldering is required).
- 🛠️ You are not confident in your abilities when disassembling a complex air duct system.
Professional repair of the No Frost system often requires not only replacing parts, but also correctly adjusting the dampers and checking the tightness of the connections. Incorrect assembly can lead to re-icing in a matter of days.
Is it possible to temporarily use the refrigerator if the top does not freeze?
It is possible to use the upper chamber as a regular cabinet for storing food (canned food, vegetables that do not require refrigeration), but storing perishable foods there (milk, meat) is strictly prohibited. Also make sure that moisture from the upper chamber does not drip down.
How long does it take the refrigerator to gain temperature after defrosting?
Usually, the system takes from 4 to 8 hours to set the temperature and stabilize operation. At this time, do not completely load the refrigerator with food, so as not to create an unnecessary heat load.
Why did the problem return after 3 days after defrosting?
This is a sure sign of a malfunction of the defrost system (the heating element or sensor has burned out). Ice accumulated again and blocked the channels. The faulty element of the defrosting system needs to be replaced.
Does the position of the temperature regulator affect the operation of the refrigerator?
Yes, if the regulator is accidentally set to minimum, the compressor may not turn on often enough. Check that the settings correspond to the recommended values (usually 3-4 divisions or +3...+4°C).