Owners of household appliances often encounter situations when the refrigerator stops freezing or, conversely, turns food into ice. In most brand models Atlant a special element is responsible for temperature control, which users often simply call “sensor”. Understanding exactly where it is located is a key step in the initial diagnosis of a malfunction. If you notice that the compressor works without stopping or does not turn on at all, the problem may lie in this particular unit.
The design of refrigerators Atlant may differ depending on the series and year of manufacture, which affects access to internal components. In some models, the sensor is hidden deep behind plastic panels, in others it is accessible immediately after removing the protective cover. Thermostat or an electronic sensor (in models with No Frost) is the “eyes” of the system, without which smart technology turns into a useless box. Knowing the exact location of this element will save you time and money on calling a technician for a simple check.
In this article we will analyze in detail the design of various modifications, consider the differences between mechanical and electronic control systems, and also provide a step-by-step algorithm of actions in case of suspected breakdown. Before starting work, you must de-energize unplug the unit by unplugging the power cord from the outlet.
Differences between a mechanical thermostat and an electronic sensor
Before looking for a specific installation location, you need to determine what type of temperature control is used in your refrigerator Atlant. This fundamentally changes the approach to search. Older and budget models are equipped with a mechanical thermostat that responds to changes in freon pressure in the sensitive tube. More modern versions, especially with the system No Frost, use electronic resistance sensors (NTC), which transmit data to the control board.
Mechanical thermostat usually looks like a plastic block with an adjustment knob and a long metal “tail” (capillary tube). Its task is to physically open or close the contacts of the compressor power supply circuit. Electronic sensor is a small part, often enclosed in a plastic or metal case, which is connected to the board with wires. An error in determining the type of device can lead to incorrect search and even damage to the wiring.
You can visually distinguish them by the presence of a handle inside the chamber. If you have a knob with numbers from 1 to 7, you have a mechanic. If the inside of the refrigerator compartment is clean, and the control is carried out by buttons on the external panel or display, you have electronics. In the latter case, there may be several sensors: one for the refrigerator compartment, another for the freezer, and sometimes a third for defrost control.
⚠️ Attention: An attempt to replace a mechanical thermostat with an electronic sensor (or vice versa) without reworking the entire control circuit is impossible. These systems are not directly compatible and require different operating principles.
How to visually identify the type of sensor?
A mechanical thermostat always has moving contacts inside and a capillary tube, which can be up to 2-3 meters long. An electronic sensor is a compact device with two wires whose resistance varies depending on temperature. If you see wires going to a small cylindrical element mounted on the wall or evaporator, this is electronics.
Where to look for the thermostat in refrigerators with manual defrosting
In classic two-compartment refrigerators Atlant with manual defrosting, the freezer compartment is usually located on top. This is where, in most cases, the mechanical thermostat is hidden. The standard place for its installation is the upper right corner of the refrigerator compartment, hidden under a plastic casing. This casing often also serves as a lampshade for a lighting lamp.
To get to the unit, you must carefully remove the lampshade. In some models it is held in place by latches, in others by screws. After removing the plastic, you will see the thermostat itself. The capillary tube from it goes deep into the wall or is attached to the evaporator inside the chamber. It is important not to damage this thin tube during dismantling, since its depressurization will lead to freon leakage and failure of the entire system.
In some series, for example, in some modifications Atlant MHM, the thermostat can be moved outside the chamber - to the back wall of the refrigerator body. In this case, access will require removing the rear cover of the unit. This is a less common option, but it is worth knowing about it if there is no corresponding hole inside the chamber. Adjustment Temperature in such models is produced by turning the rod hidden under the handle.
Location of sensors in the system No Frost
The situation with models equipped with the system No Frostlooks different. There is no ice on the walls, and the cold is distributed by a fan. Temperature sensors in such refrigerators Atlant are most often located in the freezer compartment, since it is the source of cold for the entire unit. The main sensor that controls the operation of the compressor is usually located in the evaporator area.
To access it, you will need to remove the back panel inside the freezer. It is secured with a few screws and plastic clips. Be careful: plastic becomes brittle in the cold. After removing the panel, you will see the evaporator (radiator) and fan. The sensor is often mounted directly on the fins of the evaporator or in a special socket next to it. It can be covered with a rubber tube or a plastic cap to protect it from moisture.
In the refrigerator compartment of models No Frost there may also be a sensor that monitors the temperature of the air circulating from the freezer. It is usually located on the back wall, sometimes hidden by a decorative trim. Unlike mechanics, there are no long tubes, only compact elements with wires leading to an electronic control module, which is often hidden at the top of the refrigerator or in the base.
Algorithm for searching and checking serviceability
If the refrigerator has stopped freezing, it is necessary to carry out diagnostics. First of all, make sure that the problem is with the sensor and not with the compressor or start relay. The "short circuit" method can be used to test a mechanical thermostat. Remove the wires from the thermostat contacts and connect them to each other (after unplugging the refrigerator from the mains!). If the compressor starts working after switching on, it means that the thermostat is faulty and requires replacement.
Electronic sensors require 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 room temperature (+20..+25°C) the resistance is about 5-10 kOhm. When cooling (for example, if you blow cold air on the sensor or apply ice), the resistance should change. If the resistance is zero or infinity, the element has burned out.
Below is a table that helps systematize the symptoms and probable places to look for a fault depending on the behavior of the refrigerator.
| Symptom | Probable cause | Where to look for the sensor | Actions |
|---|---|---|---|
| The refrigerator does not turn on | Thermostat is faulty (no contact) | The refrigeration chamber lamp | Close the contacts, check the compressor |
| Continuous operation of the compressor | Sticking contacts or freon leakage | The lamp or rear wall | Check the presence of cold, replace the thermostat |
| Error code on the display | Open circuit of the sensor | Ring with a multimeter, replace | |
| Increasing "fur coat" in freezer | The defrost sensor is faulty | On the evaporator, under the heating element | Replace the defrost sensor |
When taking measurements with a multimeter, be sure to disconnect the refrigerator from the power supply. If voltage gets to the tester probes, it will instantly damage the device. Also, do not forget to dry all contacts before assembly, as moisture can cause a short circuit or oxidation.
The process of replacing and setting up a new element
Replacing the temperature sensor in the refrigerator Atlant is a procedure that requires care. After purchasing a new spare part (be sure to make sure that the markings match the original!), proceed to dismantling the old one. In mechanical models, it is important to correctly install the capillary tube. It must be secured in the same place and with the same immersion depth as the original. If the tube dangles or touches the walls of the chamber in the wrong place, the refrigerator will not work correctly.
In electronic models, everything is simpler: just disconnect the connector and remove the sensor from its seat. The new element is installed in the reverse order. Pay special attention to the insulation of wire connections. Use heat shrink or good quality electrical tape to prevent condensation from entering. After assembly, do not rush to load the products.
☑️ Checklist after replacing the sensor
The first start after replacement should be idle. Allow the unit to reach temperature and turn off. If the cycle was successful and the compressor stopped at the command of the new sensor (or thermostat), the repair can be considered complete. If the behavior of the equipment has not changed, perhaps the problem lies deeper - in the control board or a refrigerant leak.
Common mistakes during self-repair
Independent repair of household appliances is full of pitfalls. One of the most common mistakes is ignoring labeling. Users buy the first thermostat they come across with a similar appearance, forgetting that different models Atlant may have different capillary tube lengths, response temperature ranges, and contact locations. Installing an unsuitable element will result in the refrigerator either not turning off or not being able to reach the desired temperature.
Another mistake is rough handling of the capillary tube. It cannot be bent at an acute angle, twisted or stretched. Inside there is a thin tube with gas or liquid, and any damage to the shell renders the thermostat useless. It is also not recommended to “treat” an old thermostat by tapping or lubricating the contacts - this gives only a temporary effect, if it gives it at all.
In models with electronics, the defrost sensor is often forgotten. If the refrigerator No Frost stops freezing and is covered with ice inside, it is too early to blame the main temperature sensor. First check the defrost circuit. Often it is the sensor that controls the heating of the evaporator that fails, and not the one that monitors the cold in the chamber.
⚠️ Attention: If you are not confident in your abilities or you do not have diagnostic tools (multimeter), it is better not to take risks. Incorrect installation of the sensor can lead to combustion of the compressor, the replacement of which costs much more than calling a technician.
Questions and answers (FAQ)
Is it possible to temporarily short-circuit the thermostat to make the refrigerator work?
Yes, this is possible for mechanical thermostats. Connecting the wires will allow the compressor to run continuously. However, you cannot use the refrigerator in this mode for a long time: it will not turn off, which will lead to freezing of food, icing and increased energy consumption. This is only a temporary measure until the purchase of a spare part.
What temperature sensor is installed in the Atlant XM 4008?
In the model Atlant XM 4008 (and the similar 4000 series) a mechanical thermostat TAM-133 or its analogue (for example, K-59) is usually installed. It is located in the lampshade of the refrigeration chamber. It is better to check the exact markings with the product data sheet or visually inspect the removed part.
Why does the refrigerator not turn off after replacing the sensor?
There may be several reasons: a thermostat is installed with an inappropriate temperature range, the capillary tube is installed incorrectly (poor contact with the evaporator), or a freon leak has occurred, and the compressor simply cannot reach the temperature at which the sensor should operate.
Where is the sensor located in a single-chamber Atlant refrigerator?
In single-chamber models, the thermostat is most often located inside the chamber, in the upper right corner, under a plastic cover. In some older models, it can be placed outside, on the body, next to the door handle or on top.
How to understand that it is the sensor that has failed and not the board?
If the multimeter shows a break or short circuit on the sensor contacts when it is removed, it is to blame. If the sensor “rings” (has resistance), but the refrigerator does not respond to its signals (does not turn on or off when closing/opening the contacts manually), then the problem is most likely in the control board or wiring.