Modern Belarusian-made refrigeration units Atlant equipped with a complex automatic control system, the core of which is a thermostat or electronic temperature sensor. It is this small element that is responsible for maintaining an optimal climate inside the chambers, starting and stopping the compressor in a timely manner. When the device begins to work intermittently, food spoils or, conversely, freezes, the first thing the technician does is pay attention to the serviceability of the sensor.
Understanding where the temperature sensor is located in the Atlant refrigerator is necessary not only for professional repairs, but also for the initial diagnosis of faults by the owner. The location of the element directly depends on the type of defrosting system: in models with a drip system and in units No Frost sensors are mounted in completely different places. An error during the search can lead to damage to the plastic panels or a violation of the tightness of the circuit.
In this article we will analyze in detail the architecture of various models, from classic two-chamber refrigerators to modern multi-flow systems. You will learn how to visually identify the installation location, what tools are required to access the unit, and how to distinguish sensor failure from other failures. Precise localization problems will save time and money, allowing you to quickly decide to replace the part.
Fundamental differences between temperature control systems
Before starting a physical search, it is important to understand the type of control of your unit. Refrigerators Atlant use two main types of regulators: mechanical thermostats and electronic temperature sensors (NTC thermistors). Mechanical devices, such as T-133 or TAM-133, are a sealed capsule with a sensitive bellows tube that responds to changes in gas pressure inside.
Electronic sensors, in turn, are resistors that change their resistance depending on the ambient temperature. They are connected to electronic control module, which analyzes the readings and issues commands to start the motor-compressor. Unlike mechanics, electronics require more precise positioning in the air flow zone.
The key difference lies in the logic of operation: mechanics physically open the circuit, while electronics only transmits a signal. Therefore, the installation location of the electronic sensor is often hidden behind decorative panels, while a mechanical thermostat often has an external adjustment knob. Understanding this difference is critical for correct diagnosis.
⚠️ Attention: If you try to replace a mechanical thermostat with an electronic one (or vice versa) without resoldering the circuit and replacing the control module, the refrigerator will not work. These systems are not directly interchangeable.
Modern models Atlant with the system No Frost can use up to three or more sensors: one for the refrigerator compartment, one for the freezer and one for the evaporator defrost system. Each of them has its own unique location, ignoring which will lead to incorrect operation of the entire unit.
Localization of the sensor in the refrigerator compartment
In classic two-chamber refrigerators Atlant with a drip defrosting system, searching for a temperature sensor in the refrigerator compartment is usually doesn't take much time. A mechanical thermostat is most often installed here. Its body, as a rule, is hidden inside the body of the refrigerator, but the adjustment knob is located outside. To find the sensitive element itself, you need to remove the plastic cover covering the handle.
Under the decorative cover you will see a metal or plastic block - this is the thermostat. A long capillary tubegoes from it into the chamber. It is the end of this tube, sealed in a copper cartridge, that is the sensitive element. In different models Atlant the tube can be fixed on the back wall, mounted in the evaporator or hanging freely in the air duct.
If we are talking about electronic models, the temperature sensor in the refrigerator compartment is often hidden in a special plastic cup or mounted on a bracket in the upper part of the rear wall. You can get to it only by partially dismantling the internal shelves and protective covers. It is important not to damage fragile plastic at low temperatures.
How to distinguish a working tube from a damaged one
Visually inspect the capillary tube along its entire length. There should be no dents, signs of corrosion or creases on it. If the tube is corrugated, check each turn. Damage to the tightness of the tube leads to gas leakage and complete inoperability of the thermostat.
To access the insides of a mechanical thermostat, it is often necessary to remove the entire top panel of the refrigerator. This is due to the fact that the main unit of the device is hidden in the technological compartment above the camera. Be careful with the wiring going to the lighting lamp, which often passes in close proximity.
Finding the sensor in the freezer and the No Frost system
The situation changes dramatically when we move to the freezer compartment, especially in models with the system No Frost. Here the temperature is much lower, and the design is more complex. In such refrigerators Atlant the air temperature sensor is usually located in the upper part of the chamber, often hidden behind the rear decorative panel.
To get to the sensor, you need to:
- ❄️ Completely defrost the refrigerator for at least 12 hours.
- ❄️ Remove all drawers and shelves of the freezer compartment.
- ❄️ Remove the rear plastic wall by unscrewing the fastening screws.
- ❄️ Find the sensor in the cold air circulation area (often next to fan).
Deserves special attention defrost sensor, which is also located in the freezer, but is attached directly to the evaporator (radiator). It is necessary to control the process of defrosting ice from the heating element. This sensor is usually pressed into an aluminum sleeve or pressed tightly to the evaporator tubes.
It would be a mistake to look for the freezer temperature sensor on the outside of the case or at the bottom of the chamber. Cold air, being heavier than warm air, falls down, but the air intake for measurement and circulation in the system No Frost is organized in the upper zone. This is where the measuring instruments are installed.
Access to the sensor through the rear panel and control module
In some models of refrigerators Atlant, especially built-in or compact ones, the design may imply access to the sensors through technological holes in the back of the case. However, most often the back panel hides the compressor, capacitor and start-up relay.
The electronic control module, to which all sensors are connected, can also be located in a niche above the refrigerator compartment or in a special box at the back. The wires from the sensors stretch through the entire body to this block. If you see a bundle of wires going into the chamber through a sealed passage, know: this is where communication lines with temperature sensors are laid.
During diagnostics, it is often necessary to “ring” the sensor without completely disassembling the refrigerator. In such cases, experienced craftsmen carefully remove the back cover, find the sensor connection block and take measurements with a multimeter. This avoids unnecessary disassembly of the plastic elements inside the cameras.
⚠️ Attention: Removing the rear metal panel requires caution. Be careful not to damage the refrigerant pipes running along the perimeter. A puncture in the tube will lead to an immediate loss of freon and costly repairs.
If your refrigerator is equipped with a display on the door, then the wires from the sensors can go through the door hinge to the main module. In this case, the search for a break or malfunction should begin by checking the integrity of the cable at the bend of the door.
Table of sensor locations in popular models
For ease of navigation through the design of various series Atlant, we have systematized data on the typical location of temperature sensors. Remember that the manufacturer may make changes to the design, so the data is for reference only.
| Refrigerator model | System type | HK sensor location | Sensor location MK |
|---|---|---|---|
| Atlant 4008 | Drip | Under the thermostat knob (mechanical) | Absent (mechanical control) |
| Atlant 4502 | Drip | Inside the case, tube on the back wall | Absent |
| Atlant 6021 | No Frost | Behind the rear panel, in the air duct | Behind the rear panel, near the fan |
| Atlant 1704 | Drip | Thermostat in a plastic casing | Absent |
| Atlant XM-4425 | No Frost | Electronic sensor in the air flow | In the area of the evaporator and air channel |
As can be seen from the table, in models without No Frost the sensor in the freezer is often absent as a separate electronic element, since the temperature there is regulated proportion of compressor operation or mechanical blowing. While in complete defrosting systems, control is carried out in each zone separately.
Fault symptoms and testing methods
Having understood where the temperature sensor is located in the Atlant refrigerator, you need to be able to determine whether it is working. The most common problem is a change in resistance, which causes the control module to receive incorrect data. For example, the sensor may “think” that it is warm in the chamber and drive the compressor without stopping, causing icing.
Main signs of failure:
- 🌡️ The refrigerator runs continuously without turning off.
- 🌡️ Complete absence of cold when the engine is running.
- 🌡️ Frequent switching on and off (clocking) at short intervals.
- 🌡️ The display shows an error code indicating an open circuit in the sensor.
To check the electronic sensor, you will need a multimeter set to resistance measurement mode (Ohm). At room temperature, a working thermistor will usually show a resistance in the range of 5–10 kOhm (the exact value depends on the model). When cooling (for example, if you blow on it or put it in the freezer), the resistance should change smoothly.
Mechanical thermostats are checked by testing the contacts. When the sensitive tube is cooled (you can put it in cold water with ice), the contacts should close or open with a characteristic click. The absence of a click or sound signal from the tester indicates a breakdown.
Rules for safe replacement and calibration
Replacing a temperature sensor is a procedure that requires care. The main rule: all work should be carried out only after the refrigerator is completely disconnected from the power supply. Even a short short in the control circuit can damage an expensive electronic module.
When installing a new mechanical thermostat, it is extremely important to correctly position the capillary tube. It should fit tightly to the surface that it is supposed to control (usually a special area on the evaporator). It is unacceptable to bend the tube at an acute angle or twist it into a knot - this will lead to rupture of the bellows.
⚠️ Attention: Never use sealants or glue to fix the sensor tube in the area of direct contact with the cooled surface. This will disrupt heat exchange and lead to incorrect readings. Use standard clips or aluminum tape.
After replacing the electronic sensor, you may need to reset errors in the control module memory. In some models Atlant this happens automatically after a reboot, in others it requires entering the service menu. Without resetting the errors, the refrigerator may continue to operate in emergency mode.
☑️ Checklist before assembling the refrigerator
The final stage should always be a test run. Leave the refrigerator empty for several hours and monitor its cycle. If the intervals between compressor starts are 15–40 minutes (depending on the load and ambient temperature), then the sensor is installed correctly and is working correctly.
Is it possible to temporarily short-circuit the sensor to make the refrigerator work?
It is strictly not recommended to operate the refrigerator with a shorted or removed sensor. This will lead to the compressor operating in continuous mode, which will cause freezing of the evaporator, overheating of the motor and rapid failure of the unit. This is only acceptable for a couple of minutes for diagnostics.
Why does the new sensor not fit?
Refrigerators Atlant of different years of manufacture may use sensors with different cable lengths and connector types. If the cable is too short, it cannot be extended by conventional twisting - soldering and high-quality insulation are required. The connector can be replaced by re-soldering the contacts from the old sensor, if they are in good condition.
How often do you need to change the temperature sensor?
The service life of the sensor is not limited to a specific time. It changes only when a malfunction is detected. However, in conditions of unstable network voltage or frequent surges, electronic thermistors can degrade after 5-7 years of operation, requiring preventive replacement during routine maintenance.
Does the location of products affect the operation of the sensor?
Yes, if the products block the air channels in the area where the sensor is installed (especially in the system No Frost), the sensor will read the wrong temperature. This can cause the refrigerator to “think” that the compartment is warm and work without interruption. Do not block the back wall.