A modern refrigerator Atlant is a complex system where each element plays a role in maintaining the ideal climate for your products. When the equipment stops freezing or, conversely, turns the chamber into a glacier, the first suspicion falls on the temperature control system. It is thermal sensor (or the thermostat) that is the “eye” and “ear” of the unit, telling the compressor when to turn on and when to pause. Understanding exactly where it is located is the first step towards self-diagnosis.
Owners are often faced with a situation where a visual inspection yields nothing, and the unit does not work correctly. Knowing the design helps you save time on calling a technician or even avoid unnecessary expenses on repairs if the problem is solved by simple adjustment or replacement of a cheap part. In this article we will analyze in detail the architecture of refrigerators Atlant and pinpoint the exact location of the sensors in various modifications.
It is important to understand that the design may differ significantly depending on the year of manufacture and model. Old two-chamber refrigerators are designed differently than modern units with a system and an electronic display. We will consider all the main options so that you can easily find the right unit in your equipment. mechanical control are designed differently than modern units with a system No Frost and electronic display. We will look at all the main options so that you can easily find the right unit in your equipment.
⚠️ Attention: Before starting any work to find or replace internal components, be sure to disconnect the refrigerator from the power supply. Working with live electrical components is deadly.
The principle of operation and types of sensors in Atlant technology
To effectively search for a part, we need to understand what exactly we are looking for. Refrigerators Atlant use two main types of temperature control devices: thermostats and thermoresistors (NTC sensors). A thermostat is a mechanical device that opens or closes an electrical circuit when a certain temperature is reached. It is equipped with a capillary tube that runs along the perimeter of the evaporator or is inserted into a special channel.
In more modern models with electronic control, the role of the controller is performed by a thermistor. This is a semiconductor element whose resistance changes depending on the ambient temperature. The signal from it is sent to control module, which already makes the decision to start the compressor. The localization of these elements is fundamentally different: if the thermostat is often taken outside or is accessible by removing the lampshade, then the thermistor can be hidden deep inside the system No Frost.
Do not confuse the temperature sensor with the defrost sensor. The latter is responsible for the operation of the evaporator heating element and is located directly on the evaporator, often in a hard-to-reach place behind the rear wall. Our goal is to find a sensor that controls the temperature in storage chamber. An error in identification will result in you replacing a working part or, worse, breaking the defrosting cycle.
- 🔍 Thermostat: Mechanical switch with a rotary knob, often located inside the chamber or on the case.
- 📡 Thermistor: Small a plastic “pill” or cylinder connected by wires to an electronic board.
- ❄️ Capillary tube: A thin copper tube coming from the thermostat that senses the temperature of the evaporator.
Determine the type of control your refrigerator Atlant the easiest way is to have a display on the door. If the temperature numbers are displayed on the screen, then you have electronics and thermistors. If a “twist” with numbers from 1 to 7 is spinning inside the chamber, you have a classic mechanical thermostat.
Where is the thermostat in single-chamber and old models
In classic single-chamber refrigerators and old two-chamber models Atlant with one freezer compartment (usually the top part), the thermostat is the easiest to find. Manufacturers often placed it inside the refrigerator compartment to make it easier to service. In most cases, it is hidden under a plastic lampshade in which the lighting lamp is installed.
To access it, you must carefully remove the lampshade. It is usually secured with latches or one or two screws. After removal, you will seethermostat housingto which a wiring harness and a thin capillary tube fit. The tube can be fixed to the evaporator (the back wall inside the chamber) with special clamps or inserted into the technological hole.
Sometimes, depending on the specific series Atlant, the thermostat can be moved outside, to the upper end of the refrigerator body. In this case, the adjustment knob is on top, and the mechanism itself is hidden in the casing. In this case, the capillary tube goes inside the housing through a special hole in the upper part of the rear wall.
When dismantling, be extremely careful with the capillary tube. This is a thin copper conductor filled with refrigerant. Kink, crease or damage pipes will lead to freon leakage and failure of the thermostat. If the tube is accidentally damaged, it cannot be repaired - a complete replacement of the unit will be required.
⚠️ Attention: The capillary tube of the thermostat is very fragile. Do not use sharp objects to detach it from the evaporator; act carefully so as not to break the tightness of the system.
Searching for a temperature sensor in two-chamber No Frost refrigerators
The situation changes dramatically when it comes to refrigerators Atlant with a system No Frost (or “Complete No Frost”). In such units there is no ice on the walls, since cooling occurs due to the circulation of cold air. The temperature sensor here does not directly contact the products and does not hang in a visible place.
In models with electronic control, the sensor (thermistor) is most often hidden in the air duct that connects the freezer and refrigerator compartments. To get to it, you will have to remove the top cover of the refrigerator compartment (if it is plastic) or dismantle the back panel inside the refrigerator compartment. In some models Atlant it may be located behind a decorative panel on the rear wall.
In the freezer compartment of the system No Frost the air temperature sensor is usually located in the upper part, closer to the evaporator, which is hidden behind the rear wall. Replacing it often requires defrosting the refrigerator completely within 24 hours and removing the back panel in the freezer. This is already a level of complex repairsthat requires accuracy.
Difficulties of access in No Frost
In Atlant models with the No Frost system, access to the sensor often requires removing many fasteners and plastic covers. It is recommended to take photographs of each stage of disassembly in order to correctly reassemble the structure. It is also important not to damage plastic air ducts, which become very fragile in the cold.
If you see that the back wall in the refrigerator compartment is covered with frost, and the compressor is humming continuously, this is a sure sign that temperature sensor or the defrost sensor is giving incorrect readings. The electronics “thinks” that it is warm in the chamber and does not give a command to stop the compressor or start defrosting.
Removing and checking the serviceability of the temperature sensor
After you have found the intended location of the sensor, it must be checked. For mechanical thermostats, there is a simple visual and tactile method. At room temperature the contacts should be closed (unless it is a specific type). You can “ring” the contacts with a multimeter in resistance measurement mode.
To check the thermistor (NTC), you will definitely need a multimeter. It is necessary to measure the resistance of the sensor at room temperature and compare it with the table values for a specific model Atlant. Typically at +20°C the resistance is about 5-10 kOhm (value may vary). If the multimeter shows a break (infinity) or zero, the sensor is faulty.
Another way to check is “thermal”. Measure the resistance of the sensor, and then pinch it with your fingers or gently heat it with a hairdryer (without overheating!). The resistance of a working thermistor should change smoothly. If the numbers on the multimeter screen remain the same, it means that the element has “died” and requires replacement.
☑️ Checking the sensor with a multimeter
When replacing a mechanical thermostat, it is important to install the capillary tube correctly. It should fit snugly against the evaporator in the same place where the old one stood. For fixation, use standard clamps or special heat-resistant glue, if the design allows. Loose contact will lead to incorrect readings and frequent starts of the compressor.
Table of common faults and symptoms
Understanding the symptoms helps to quickly determine whether the problem lies in the sensor. Below is a table that will help compare the behavior of your refrigerator Atlas with a possible cause.
| Symptom | Probable cause | Action |
|---|---|---|
| The refrigerator does not turn on, the light is on | The thermostat is faulty (no contact) | Ring the thermostat, replace it |
| The compressor runs without stopping | Thermostat contacts sticking or breakdown thermistor | Check the sensor, replace |
| The chamber is too cold, the food freezes | Sensor malfunction (shows heat) | Replace the temperature sensor |
| Frequent on/off (clocking) | Incorrect installation of the capillary or breakdown | Check the installation of the capillary |
| Error on the display (for example, F4, F5) | Open circuit of the sensor | Check the wiring and the sensor itself |
Please note that error codes may vary depending on the series Atlant. For example, in some models, the code F4 indicates a problem with the temperature sensor of the refrigerator, and F5 - the freezer. Always look for the exact decoding in the instructions for your specific model.
Replacing the sensor: important nuances and tips
The replacement process thermal sensor in the refrigerator Atlant requires care. If you are replacing a mechanical thermostat, make sure the new one has similar characteristics (on/off temperature range). Installing an unsuitable thermostat will result in the refrigerator either not gaining cold or freezing to the point of a “glacier.”
When working with electronic sensors, it is important not to confuse the polarity, although in thermistors it usually does not matter, since this is a passive element. The main thing is to ensure reliable contact in the connector. Oxidized contacts can give false readings, simulating a breakdown of the sensor itself. Clean the connectors before installing a new part.
After replacing and assembling the refrigerator, do not rush to load food. Let the unit run idle for 2-3 hours. During this time, the system will return to mode, and you will be able to make sure that the compressor turns off when the set temperature is reached, and there is no excessive hypothermia in the chambers.
⚠️ Attention: If after replacing the sensor the refrigerator continues to operate incorrectly, the problem may not be with it, but with the control module or freon leak. Do not change all the parts in a row without an accurate diagnosis.
Frequently asked questions (FAQ)
Is it possible to temporarily close the thermostat contacts to make the refrigerator work?
Yes, the mechanical thermostat can be temporarily closed to check the operation of the compressor. However, you cannot leave the refrigerator in this mode for a long time: it will freeze continuously, which will lead to freezing of food and breakdown of the compressor due to overload.
Where to buy an original sensor for the Atlant refrigerator?
It is best to look for original spare parts in authorized service centers Atlant or specialized stores spare parts for household appliances. There are many analogues on the market that may work unstably. When purchasing, pay attention to the marking.
Why does the refrigerator not turn off after replacing the sensor?
Possible reasons: a thermostat is installed with a different temperature range, the capillary tube is installed incorrectly (does not fit tightly enough to the evaporator) or the problem lies not in the sensor, but a freon leak or a malfunction of the compressor itself.
How to understand that it is the sensor that has failed and not the control board?
You need to ring the sensor with a multimeter. If its resistance changes when heating/cooling according to the table, then it is working. If the sensor is intact, but the refrigerator does not respond to its readings, the electronic control module is most likely faulty.
Is it necessary to defrost the refrigerator before replacing the thermostat?
To replace a mechanical thermostat in the refrigerator compartment, complete defrosting is usually not required if there is no ice. However, to replace sensors in the No Frost system (in the freezer or air ducts), complete defrosting for 24 hours is required to avoid damage to the plastic elements during dismantling.