Modern refrigerators Beko with the system No Frost have become the standard of comfort in kitchens around the world. Unlike older models, where you had to manually beat the ice, here air circulation occurs automatically. This allows you to forget about regular defrosting and keeps food fresh much longer.
However, in order for the equipment to serve for a long time, it is useful for the owner to understand the physical processes occurring inside the chamber. Principle of operation It is based on the forced circulation of cooled air, which is evenly distributed throughout the entire volume. In this article we will look in detail at what the system consists of, how it is controlled and why malfunctions sometimes occur.
Understanding the structure of your unit will help you quickly diagnose simple faults. You will stop panicking when the first signs of frost appear and you will know when it’s really time to call a professional. Let's dive into the technical side of the issue.
The basic principle of air circulation in the chamber
The technology is based on the constant removal of moisture from the interior of the refrigerator. Unlike static cooling, here the air is in motion. A special fan drives air masses through a hidden evaporator, where the main heat exchange occurs. No Frost there is a constant removal of moisture from the interior of the refrigerator. Unlike static cooling, here the air is in motion. A special fan drives air masses through a hidden evaporator, where the main heat exchange takes place.
Circulation occurs as follows: warm air from the chamber is sucked in by the fan and passes through the evaporator. There it cools sharply, and the moisture it contains condenses and freezes on the walls of the evaporator. Already dry and cold air returns to the chamber without leaving condensation on the products.
⚠️ Attention: The ventilation holes in the rear wall of the chamber must not be covered with products. This disrupts circulation and can lead to overheating of the compressor.
The control system strives to maintain the set temperature with high accuracy. Sensors read the readings and regulate the operation of the compressor. If you notice that products in different corners of the shelf have different temperatures, this may indicate a violation of airflow.
It is important to note that the system No Frost does not create cold, but only redistributes it. The source of cold is the compressor and refrigerant. The only difference is in the method of delivering this cold to the products. Models Beko often use technology Multi Air Flowthat supplies air to several levels simultaneously.
Evaporator device and defrost system
The key element of the system is the evaporator, which is usually located behind the rear panel of the freezer or refrigerator. It is on this that ice freezes, which is then removed. This process is called defrosting or defrosting.
The defrosting cycle starts automatically using a timer or according to sensor readings. Models Beko most often use a combined approach. The heating element (heating element) turns on for a short time, melting the ice on the evaporator. The resulting water flows into a special pan, from where it evaporates naturally.
- ❄️ Defrost heating element —a heating element that melts the ice on the evaporator.
- ⏱️ Timer defrost —controls the frequency and duration of the defrost mode.
- 🌡️ Defrost thermostat - a sensor that turns off the heating element when the ice has completely melted, preventing overheating.
Failures in the defrost system are the most common cause of breakdowns. If the heating element burns out or the sensor “sticks,” the ice will stop being removed. Over time, the ice coat will grow and block the ventilation ducts. Cold will stop flowing into the chamber, although the compressor will work continuously.
Modern models Beko have introduced diagnostic systems that can signal such problems by flashing indicators. However, a visual inspection of the back of the camera will often provide more information. If you see ice in only one corner or strange build-up of ice, this is a sign of a malfunction in the defrost circuit.
Why is the ice not visible from the outside?
The evaporator is hidden behind a plastic panel. To see it, you need to remove the back wall inside the freezer. This is where the “magic” of turning moisture into ice and back happens.
The role of electronics and temperature sensors
This entire process is monitored by an electronic control module. This is the “brain” of your refrigerator Beko. It receives signals from various sensors and makes decisions about turning on or off the compressor, fan and heating element.
There are usually two or three main temperature sensors. One controls the temperature in the refrigerator compartment, the second controls the temperature in the freezer. The third, often called defrost sensor, monitors the temperature of the evaporator. It is he who gives the command to stop heating during defrosting.
| Component | Function | Fault symptom | |||
|---|---|---|---|---|---|
| Evaporator sensor | Control of defrost temperature | Ice build-up, defrost failure | |||
| Refrigeration chamber sensor | Cold adjustment | Freezing or heat in the chamber | Fan | Air circulation | Noise, lack of cold when the compressor is running |
| Defrost heating element | Evaporator heating | Icing of channels |
Electronics also controls the dampers, if your model has a system Duo Cooling or a similar one that allows you to independently regulate the climate in different chambers. In such systems, the dampers open and close, letting cold air from the freezer into the refrigerator compartment.
If the electronic module receives erroneous data from the sensors, it may behave inappropriately. For example, “think” that the chamber is warm and run the compressor without interruption. Diagnosis of such malfunctions requires special instruments, since it is difficult to visually determine a breakdown of the sensor.
Features of models with bottom location freezers
In refrigerators Beko with a bottom freezer, the system No Frost is often implemented only in the freezer compartment. This is the so-called system Frost Free. In the refrigerator compartment, moisture is removed naturally by dripping onto the back wall.
This means that condensation may appear in the main chamber, which periodically freezes and melts. This is normal for this design. However, if you see a thick layer of ice on the floor of the refrigerator compartment or freezing on food, this is a cause for concern. In fully automatic systems, which are found in more expensive models, circulation is also organized in the upper compartment. Here additional air ducts passing through the body are used. Their clogging is less common, but also possible.
In fully automatic systems Total No Frost, which are found in more expensive models Beko, circulation is also organized in the upper compartment. Here additional air ducts passing through the body are used. Their clogging is less common, but also possible.
- 🧊 Freezer —always equipped with a full-fledged No Frost with heating elements.
- 💧 Refrigerator compartment —often has a drip system (crying wall).
- 🌬️ Channels —connect compartments in full-type systems.
When operating such refrigerators, it is important to monitor the tightness of the doors. If the seal of the refrigerator compartment is worn out, moist air from the room will enter there. The drip defrosting system may not cope with excess moisture, and water will begin to leak out or freeze in the tray under the compressor.
⚠️ Attention: In models with a bottom freezer, the drainage hole in the refrigerator compartment must be cleaned regularly. Use a soft brush or cotton swab to remove mucus and debris.
Typical faults and their diagnosis
Despite the reliability of the brand Beko, equipment is not immune from breakdowns. The most common problem is a violation of the defrost mode. Symptoms can vary: from insufficient cold to complete failure.
If you hear the fan humming or crackling, the blades may be hitting ice. This happens when the defrost system does not have time to melt all the ice. In this case, it is necessary to completely defrost the refrigerator within 24 hours.
☑️ Diagnosis of cold problems
Another common problem is the failure of the defrost sensor. He can “lie” to the control module that the evaporator temperature is already positive, although there is still ice there. As a result, the heating element does not turn on or turns off too early.
You can diagnose the problem by paying attention to the operating cycle. If the refrigerator runs non-stop, but there is no cold, the channels are most likely clogged with ice. If it turns on rarely, but it’s warm inside, the problem may be a freon leak or a compressor malfunction, which is more complicated.
In some cases, manually restarting the system helps. To do this, you need to unplug the refrigerator from the outlet for 15-20 minutes. The electronics will reset the errors, and the system can return to normal operation if the failure was software.
Rules for operation and care of the system
For the refrigerator Beko to serve for a long time, it does not require complex maintenance, but basic rules must be followed. The main thing is not to overload the chamber with products so that they block the ventilation holes. Although the system is called (no frost), this does not mean that defrosting is never needed. Manufacturers recommend carrying out preventive defrosting 1-2 times a year. This allows you to remove odors, flush the system and give the equipment a “rest.”
Although the system is called No Frost (no frost), this does not mean that defrosting is never necessary. Manufacturers recommend carrying out preventive defrosting 1-2 times a year. This allows you to remove odors, flush the system and give the equipment a “rest.”
When washing internal surfaces, do not use abrasives or hot water. Plastic can become deformed, and chemicals can damage seals or sensors. Use a soft cloth and a mild soap solution.
It is also worth periodically checking the condition of the rubber seals. If they are cracked or do not fit well, warm air will enter the chamber. This will lead to increased condensation formation and increased load on the compressor.
⚠️ Attention: Never use sharp objects (knives, screwdrivers) to chip ice if it does appear. You can damage the cooling circuit, and then repair will be very expensive or impossible.
Frequently asked questions (FAQ)
Why does the No Frost refrigerator hum or whistle?
The noise may be caused by the fan. If it starts to hum, a foreign object may have gotten into it or ice may have frozen in. The source of the sound can also be the compressor itself or the flow of refrigerant in the tubes. If the sound appears suddenly and becomes louder, you should call a technician.
Is it necessary to defrost the Veko No Frost refrigerator?
Technically, the system removes moisture automatically. However, complete defrosting (turning off for 24 hours) is recommended once a year for hygiene, removing odors and preventing hidden malfunctions of the defrosting system.
What to do if ice appears on the back wall of the refrigerator compartment?
In models with a bottom freezer, a small layer of frost on the back wall is the norm (drip system). It should melt when the compressor stops. If the “fur coat” is growing, check the tightness of the door closure and the operation of the thermostat.
How to understand that the defrost sensor is faulty?
The main symptom is that the refrigerator is working constantly, there is no or little cold in the chambers, and a large lump of ice is found in the freezer behind the back wall. An accurate diagnosis can only be carried out by a specialist with a multimeter.
Is it possible to install a No Frost refrigerator near the battery?
It is strictly not recommended. Any refrigerator, especially with a No Frost system, requires good heat exchange. Proximity to a heat source will cause the compressor to wear out, which will lead to rapid failure.