Modern refrigerators Atlant with a system No Frost or drip defrosting rely heavily on the accuracy of temperature sensor readings. When the equipment stops freezing or, conversely, begins to turn food into ice, most often the culprit is the thermal sensor. Understanding its location is the first step to self-diagnosis and saving on calling a technician.
In this article we will analyze in detail how to find this small but critical element in various models of the Belarusian brand. You will learn why it fails and how to properly replace it so that your refrigerator works like a clock again.
The location of the sensor depends on the specific design of the evaporator and the type of cooling system. In some models it is hidden deep in a plastic casing, in others it is accessible immediately after removing the back wall. Careful study The device of your model will help avoid unnecessary damage to the plastic during disassembly.
Operation principle and role of the thermal sensor
Thermal sensor, or thermistor, is a semiconductor element that changes its electrical resistance depending on the ambient temperature. In refrigerators Atlant he acts as the main informant for the electronic control module. It is on the basis of its readings that the controller makes a decision: turn on the compressor for cooling or to start defrosting the evaporator.
If the sensor transmits incorrect data, the control system will “blind”. The refrigerator may think that it is warm inside and work without stopping, or it may think that the cold is sufficient and not start the motor-compressor at all. The critical parameter is the sensor resistance at 25°C, which is usually 4.6–4.7 kOhm for most Atlant models.
There are two main types of sensor locations in these units:
- 🌡️ Air sensor - measures the temperature inside the refrigerator or freezer.
- 🧊 Defrost sensor - attached directly to the evaporator and controls the defrosting process.
Failure of any of them leads to serious malfunctions unit.
⚠️ Attention: Before starting any work to find the sensor, be sure to disconnect the refrigerator from the power supply. Working with live electrical wiring and electronic components is dangerous and can damage the main control module.
The electronic control unit Atlant is very sensitive to voltage surges and short circuits in the sensor circuit. Careless handling of wires when searching for an installation location may lead to the need to replace an expensive board.
Symptoms of a malfunctioning temperature sensor
Before disassembling the refrigerator, you should make sure that the problem lies in the sensor. Often, users look for where an element is located when the symptoms point to completely different nodes. However, there are a number of signs that with a high degree of probability indicate failure of the thermistor thermistor.
First of all, pay attention to the operating mode of the compressor. If it buzzes continuously without turning off, or, conversely, remains silent for days, although it is warm in the chamber, this is the first bell. Also, error codes may light up on the display (if there is one), for example F4 or F5, which in the documentation Atlant often corresponds to problems with temperature sensors.
The main symptoms also include:
- ❄️ Formation of a “fur coat” or ice on the back wall of the refrigeration chamber when the system is running
No Frost. - 🔥 Defrosting food in the freezer while the compressor is running.
- 💡 Frequent flashing of the emergency temperature indicator.
Ignoring these signals can lead to failure of the compressor, the repair of which will cost much more than replacing the kopek sensor.
Sometimes the refrigerator can behave strangely only in certain modes. For example, at night it freezes normally, but during the day, when the apartment is hotter, it stops coping. This indicates that the calibration of the sensor is broken, and it does not correctly read changes in the external environment.
Where to look for the sensor: main installation locations
Searching for a temperature sensor in the refrigerator Atlant is always a process of disassembling the internal space of the camera. Manufacturers specifically hide this element to protect it from mechanical damage and direct contact with products. In most models, it is located in the upper part of the back wall.
In refrigerators with a system No Frost the defrost sensor is usually installed in the lower part of the evaporator, often in a special hole or pressed against the refrigerant tubes. You can get to it only by removing the plastic panel covering the evaporator. In the refrigerator compartment, the air sensor is often hidden behind a decorative grille or in a special plastic cup.
For models with a drip system (“crying wall”) the situation is simpler. The sensor can be built into the body or mounted on the inner surface of the back wall.
- 🔍 In two-chamber models, look for sensors in both compartments.
- 🔍 In three-chamber (with zero zone) sensors there can be three.
The exact location depends on the series of the refrigerator and the year release.
Nuances of location in older models
In older Atlant models (manufactured before 2010), the sensors could have a different shape and mounting. They were often longer and simply attached to the wall with a clip, without a protective plastic cap. When replacing with modern analogues, a slight modification of the seat may be required.
Tracing the path of the wires, you can go to the location where the sensor is installed.
Step-by-step instructions for accessing the sensor
To get to the faulty element, you will have to perform a series of steps to dismantle the internal panels. This process requires care, since the plastic in refrigerators Atlant in the cold becomes brittle and breaks easily.
First you need to completely defrost the unit. Even if you have a system No Frost, for safe disassembly you need the ice to melt. Then remove all shelves, drawers and guides from the chamber where the sensor is supposed to be located.
☑️ Preparation for disassembly
Next follow the algorithm:
1. Locate and remove the screws securing the rear plastic panel. They can be hidden under decorative plugs.
2. Carefully bend back the latches. Do not use excessive force - if the panel does not move, check that all screws are removed.
3. After removing the panel, you will see the evaporator and the wires that go to it. The defrost sensor will be mounted on the evaporator tubes, and the air sensor will be in the upper part of the chamber.
| Sensor type | Location | Mounting | Wire color (usually) |
|---|---|---|---|
| Defrost (Evaporator) | On the evaporator, below or in the center | Clip or in the hole | White/Blue |
| Air | Upper part of the rear wall | In a plastic case | Yellow/Green |
| Defrost (old models) | Bottom behind the panel | Soldered or pressed | Black/Red |
When removing the panel, try not to pull the wires sharply. They may be short, and a sudden movement will lead to a break in the contacts of the control module itself. If the panel is difficult to remove, check for hidden screws in the depths of the holes.
Diagnostics and testing with a multimeter
Before buying a new part, you need to make sure that the old one is really faulty. Visual inspection rarely gives results, since the temperature sensor is a hermetically sealed capsule. The only reliable way is to measure electrical resistance.
To check, you will need a multimeter switched to resistance measurement mode (Ohm, limit 20 kOhm). Disconnect the sensor connector from the control board or cut the wires (if the sensor is disposable and comes complete with a connector, but it is better to use soldering or twisting to check).
The testing process looks like this:
- 🔌 Connect the multimeter probes to the sensor contacts.
- 🌡️ Record the readings at room temperature (about 20-25°C).
- 🧊 Place the sensor in the freezer for 10-15 minutes and measure the resistance again.
The resistance should change. If it remains the same or shows infinity (break), the sensor is faulty.
⚠️ Attention: Technical characteristics of the sensors may vary depending on the specific series of the Atlant refrigerator. Always check the nominal resistance with the documentation for your model or the markings on the part body.
A change in resistance during cooling is considered normal. For example, at 25°C it can be 4.7 kOhm, and at 0°C it can grow to 12-14 kOhm. If the device shows “1” (infinity) or “0” (short circuit) immediately, the element is dead.
Replacing the sensor and assembling the system
If the diagnostics confirmed the malfunction, we proceed to the replacement. Refrigerators Atlant most often use universal sensors that can be adapted. The main thing is to ensure the tightness of the connection and correct contact.
The old sensor is carefully removed from the seat. If it is glued or filled with foam, use a utility knife or a thin screwdriver tip, being careful not to damage the evaporator tubes. The new sensor is installed in the same position so that it correctly reads the temperature.
Connecting the wires is best done by soldering, after putting on a heat-shrinkable tube. Twisting under conditions of constant compressor vibration and temperature changes is a less reliable option. After soldering, be sure to check the insulation.
The final stage is assembly. Reinstall the evaporator panel, making sure that the wires are not pinched or touching any moving parts of the fan (if equipped). Tighten all the screws, install the shelves and turn on the refrigerator. After 30-40 minutes, check whether the cooling cycle has begun.
After replacement, errors in the electronic module may need to be reset. To do this, you need to unplug the refrigerator for 10-15 minutes. This will allow the controller to reboot and read the readings of the new sensor.
Frequently asked questions (FAQ)
Is it possible to temporarily operate the refrigerator without a sensor?
Technically, you can start the compressor by closing the circuit, but this is strictly not recommended. Without temperature control, the refrigerator will either work constantly or will not turn on at all, which will lead to food spoilage or compressor failure.
Which sensor is suitable for Atlant MXM 2808?
For most models of the 2808 series, sensors with a resistance of 4.7 kOhm at 25°C are used. However, it is better to check the markings on the burnt element or use a multimeter to accurately select an analogue.
Why does the refrigerator not freeze after replacing the sensor?
Perhaps the new sensor has a different resistance, is incorrectly installed in the seat, or the problem does not lie there (for example, a freon leak or a compressor malfunction). Also check the quality of the wire connection.
How to distinguish a defrost sensor from an air sensor?
The defrost sensor is usually attached directly to the metal evaporator and often has a shorter leg or a specific mount. The air sensor hangs in the chamber space or is built into a plastic case on the wall.