Faced with the fact that your Atlant refrigerator stops turning off or, conversely, does not start the compressor at all, many owners immediately begin to suspect that the thermostat has failed. This small but critical element is responsible for maintaining the desired temperature inside the chambers. Understanding where the thermostat is locatedis the first step to self-diagnosis or professional equipment repair.
The location of the sensor directly depends on the type of defrosting system and the year of manufacture of your model of household appliances. In old units with a “crying” system and in modern models with No Frost the design may be radically different. Incorrect determination of the installation location or careless handling of the wiring can lead to more serious damage, so it is important to clearly understand the structure of your specific unit before starting work.
In this article we will analyze in detail the architecture of the brand's refrigeration units Atlant, consider the layout of thermostats for different series and discuss the nuances of their replacement. You will learn how to safely get to the desired unit, what tools you will need and what to pay special attention to so as not to damage the fragile elements of the cooling system.
The principle of operation and the role of the thermostat in the system
The thermostat, or thermostat, is an electromechanical or electronic device that continuously reads the temperature inside the refrigerator or freezer. Based on the data received, it opens or closes the electrical circuit that supplies voltage to compressor. If the temperature rises above the set norm, the contacts close and the motor starts working. When the set threshold is reached, the circuit opens, stopping the cooling.
In refrigerators Atlant mechanical thermostats with a bellows tube are most often used. The principle of their operation is based on the change in the volume of gas or liquid inside the sensitive tube when the temperature changes. This tube, called capillary, is brought directly into the working area. Any damage to this tube or disruption of its contact with the evaporator leads to incorrect readings and malfunctions of the entire unit.
⚠️ Attention: Mechanical thermostats cannot be repaired. If the diagnostics show that they are faulty, the only way out is to completely replace the unit with a new one that matches your model.
Electronic control systems, which are found in more expensive and modern models, use thermistors (resistance sensors). They have no moving parts and bellows tubes, transmitting data to the central control module. The search for such a sensor differs from the search for a mechanical analogue, since it is often built into the housing or attached to the air ducts, rather than hanging freely in the chamber.
Location in models with a weeping defrosting system
In classic two-chamber refrigerators Atlant with manual or drip defrosting, the thermostat is traditionally located inside the refrigeration chamber. This is the most common and user-accessible scheme. Usually the device is hidden behind a plastic cover, which also serves as the basis for a temperature control knob or a light bulb.
To access the unit, you need to open the door of the refrigerator compartment and pay attention to the upper part of the right or left wall (depending on the specific series). Most often, the thermostat is located on the right, under the lamp shade. The design can be made in the form of a separate block to which the wires fit, or it can be integrated into a common plastic control housing.
For dismantling or visual inspection, it is often necessary to remove the decorative trim. It can be held on by latches that need to be carefully pressed out with a flat-head screwdriver, or secured with screws hidden under the plugs. After removing the plastic, you will see itself thermostat, from which a corrugated capillary tube goes deep into the wall, as well as electrical terminals suitable for it.
It is important to understand that in models with a “crying” system, the capillary tube of the thermostat is fixed directly to the surface evaporator, which is located behind the back wall of the camera. It can be inserted into a special hole or pressed with a metal bar. It is this contact that allows the sensor to correctly read the temperature of the cooling element.
Where to look for the sensor in No Frost refrigerators
The situation with searching for a thermostat in systems No Frost ("dry freezing") is radically different. In such refrigerators Atlant a mechanical thermostat in its usual form inside the chamber is often missing. The temperature here is controlled electronically, and sensors (thermistors) are located in hidden places: inside the air ducts, on the back wall of the freezer chamber or in the evaporator area.
If your model does have a mechanical regulator installed (which happens in transitional or specific series), it may not be located inside the chamber, but outside - at the top of the refrigerator, under the top cover housing, or in a special compartment behind the decorative panel. In some cases, access to it is possible only after partial disassembly of the upper part of the unit.
Electronic temperature sensors in the No Frost system are usually represented by small elements on wires that are inserted into special sockets on plastic air ducts. Replacing them requires removing the back panel of the freezer, which carries the risk of damaging the fragile plastic at low temperatures.
⚠️ Attention: In No Frost systems, replacing temperature sensors often requires completely defrosting the unit within 24 hours. An attempt to remove plastic panels without defrosting may lead to their breakage.
Diagnostics of electronic sensors is not possible using the visual method. To check their performance you need multimeterwhich measures resistance at different temperatures. If you do not have the skills to work with electronics, it is better to entrust this procedure to the specialists of the service center.
Why is there no mechanical thermostat in No Frost?
In dry freezing systems, the temperature is controlled at several points simultaneously (evaporator, air in the chamber, ventilation zone). A mechanical thermostat is capable of controlling only one point, so it is replaced by an electronic control unit with a set of thermistors.
Step-by-step instructions for dismantling the thermostat
The process of replacing the thermostat requires care and compliance with safety precautions. Before starting any work, you must completely disconnect the refrigerator from the power supply. Unplug the plug from the socket and make sure that access to the rear wall of the unit is free.
Then you should proceed sequentially so as not to damage the wiring and plastic elements. The main task is to free the thermostat from its fastenings and safely remove the sensitive capillary tube from the evaporator shaft (for mechanical models).
☑️ Safe dismantling algorithm
The most delicate moment is working with the capillary tube. It is very thin and easily pinches or breaks. If the tube is inserted into a hole in the chamber wall, it must be pulled out very slowly and smoothly, without jerking. In some models Atlant the tube is additionally fixed with a metal bracket or screw, which must first be unscrewed.
After removing the old element, install the new thermostat in the reverse order. Make sure the sensing tube is inserted to the same depth as the old one. Insufficient immersion of the tube will lead to the fact that the refrigerator will work intermittently or will not be able to reach the desired temperature.
Correspondence table for models and location of components
Different series of refrigerators Atlant have their own design features. Below is a summary table that will help you navigate depending on the series of your device. However, remember that there may be modifications within the same series, so visual inspection always takes precedence over tabular data.
| Series / Model | System type | Thermostat location | Type sensor |
|---|---|---|---|
| Atlant 400th series | Crying | Inside the chamber, top right | Mechanical |
| Atlant 600th series | Crying / No Frost | Inside the chamber or under the top cover | Mechanical / Electronic |
| Atlant XM-4423 | No Frost | Behind the back panel of the freezer | Electronic (thermistor) |
| Atlant 1700 series | Crying | Inside the chamber, under the ceiling | Mechanical |
Using an unsuitable thermostat can lead to rapid compressor failure or food spoilage. When selecting an analogue, pay attention not only to the mounting dimensions, but also to the temperature response range and the length of the capillary.
Fault diagnosis and typical errors
Before changing the thermostat, you should make sure that this is the problem. Often the symptoms of a thermostat failure can be confused with a freon leak or a malfunction of the compressor start relay. If the refrigerator hums, but does not cool, or, on the contrary, freezes to the point of “glacier”, this is a reason to check.
One of the simple ways to check a mechanical thermostat is the “jumper method”. Having disconnected the refrigerator from the network, remove the wires from the thermostat terminals and connect them directly (close the circuit). If the compressor starts working after being plugged in, then the problem is most likely in the thermostat. If the motor is silent, the fault may be in the compressor itself or the relay.
A typical mistake when replacing is to ignore the condition of the door seal. If seal is worn out and leaking heat, the compressor will work constantly, trying to compensate for the loss of cold. In this case, replacing the thermostat will not solve the problem, but will only lead to new costs.
⚠️ Attention: The design and arrangement of elements may vary slightly depending on the year of manufacture of a particular batch of refrigerators. Always check the technical documentation or the diagram included in the product passport.
It is also worth remembering that electronic control units are sensitive to voltage surges. If there are frequent fluctuations in your network, a new electronic temperature sensor or module may fail soon after installation without an additional stabilizer.
Frequently asked questions (FAQ)
Is it possible to replace a mechanical thermostat with an electronic one in the Atlant refrigerator?
Theoretically, this is possible, but it requires deep redesign of the control system. You will have to change not only the sensor, but also install an electronic control unit, reprogram the operating logic and, possibly, change the wiring. For household repairs this is impractical and economically unprofitable. It is better to install an original mechanical analogue.
Why did the refrigerator start working non-stop after replacing the thermostat?
Most likely, the capillary tube of the new thermostat is not inserted completely or does not fit tightly enough to the evaporator. The sensor “does not sense” a real decrease in temperature and does not give a command to turn off the compressor. Also, the reason may be an incorrect setting or defective element of the new element.
How to understand that the thermostat is “stuck”?
If the refrigerator does not respond to turning the temperature control knob (a characteristic click is not heard even with strong cooling or heating the sensor area with a hairdryer), we can talk about sticking contacts. Under normal conditions, when the temperature changes, you should hear a distinct click of the contacts opening or closing.
Is it necessary to defrost the refrigerator before replacing the thermostat?
For models with a weeping system, complete defrosting is not necessary, but it is advisable to prevent water from getting on the electrical contacts when removing the panels. For No Frost systems, defrosting is required, since you will need access to the internal panels of the freezer, which cannot be removed without defrosting without the risk of breakage.