A sudden increase in temperature in the refrigerator compartment or, conversely, excessive freezing of food near the wall are sure signs that the temperature control system has failed. In refrigerators Atlant, which are famous for their reliability, the thermostat is most often the culprit of such problems. This small device is responsible for turning the compressor on and off depending on the specified parameters, and its incorrect operation can lead to damage to a large number of products.
Before calling a technician or buying a new spare part, it is necessary to carry out proper diagnostics. Often, equipment owners make a mistake, immediately blaming the compressor or freon leak, although the problem lies in the electrical control circuit. Checking the thermostat This is a procedure that is accessible even to a person with minimal skills in using tools, if you know the sequence of actions and safety measures.
In this article we will examine in detail how determine the malfunction, what tools are needed for accurate diagnosis and what nuances you should pay special attention to when working with equipment Atlant. You will learn how to distinguish a broken sensor from other problems and whether it is worth doing the repair yourself.
Symptoms of a faulty thermostat
Understanding the symptoms is the first step to successful repair. The thermostat (or thermostat) works on the principle of opening and closing an electrical circuit when a certain temperature is reached. When it fails, the refrigerator Atlant begins to behave uncharacteristically. Most often, there are two extremes: either the unit does not turn on at all, or it works without interruptions, turning the chamber into a freezer.
If you notice that the food in the refrigerator compartment is covered with an ice crust, and a “fur coat” has formed on the back wall, this may indicate sticking of the contacts in the “on” position. In this case, the compressor hums continuously, without going to rest. On the other hand, if it becomes warm inside and the motor is silent, perhaps the circuit is open forever, and the start signal simply does not arrive.
⚠️ Attention: If the refrigerator Atlant works without stopping, this creates a critical load on the compressor. Long-term operation in this mode can lead to burnout of the motor, the repair of which will cost much more than replacing the thermostat.
It is also worth paying attention to the frequency of switching on. A working device provides cyclical operation: for example, 10 minutes of work and 20 minutes of rest. If the cycles have become too short or, conversely, the pauses have disappeared, thermal sensor requires checking.
- ❄️ The food in the refrigerator freezes, although the regulator is set to minimum.
- 🔥 It’s warm inside the refrigerator, the compressor does not start, although the power indicator is on.
- 🔌 The unit turns on for a few seconds and immediately turns off (cycling).
- 💧 The appearance of puddles under the refrigerator due to frequent melting of ice during incorrect cycles.
Sometimes the problem may not be in itself sensor, but in its capillary tube, which could become dislodged or damaged. In models Atlant with mechanical control, the end of this tube is attached to the evaporator. If the fastening is loose, the sensor stops reading the temperature correctly.
Preparation for diagnostics: tools and safety
Any work related to electrical devices requires strict safety precautions. A refrigerator Atlant is a complex electromechanical device, and careless handling of the wiring can be dangerous. The first and most important step is to completely disconnect the unit from the power supply. It is not enough just to turn off the button, you need to unplug the plug from the socket.
To carry out high-quality diagnostics, you will need a minimum set of tools. The main device will be a multimeter (tester), which allows you to measure resistance and check the integrity of the circuit. Without this device, the check will be only approximate, based on visual inspection and indirect signs.
☑️ Preparation for checking the thermostat
In addition to the multimeter, prepare a flat-head and Phillips screwdriver for removing the panels, as well as pliers. If you plan to remove the thermostat completely, you may need a knife to carefully remove seals or latches, if any. It is important to ensure good lighting of the work area, since the inside of the refrigerator is often in the shade.
Before disassembling, it is recommended to take several photographs of the internal wiring. In refrigerators Atlant the color marking of wires may vary depending on the year of manufacture and model. The photographs will help you not to confuse the contacts during reassembly.
⚠️ Attention: Do not touch the metal parts of the multimeter or the internal components of the refrigerator with wet hands. Residual electricity or condensation can cause an unpleasant electric shock.
It is also worth preparing a container for defrosting if you plan to get to the evaporator. Although complete defrosting is rarely required to check the thermostat itself, having a rag and a tray will not be superfluous.
Access to the thermostat in different Atlant models
The location of the thermostat in refrigerators Atlant depends on the type of control (mechanical or electronic) and the specific series of the model. In most two-compartment refrigerators with mechanical controls, the thermostat is located inside the refrigerator compartment. Usually this is a horizontal plastic handle located on the right wall or under the ceiling of the chamber.
To get to the contacts, you must carefully remove the plastic casing of the regulator. In some models it is held in place by latches, in others it requires unscrewing a screw hidden under a decorative plug. Proceed with caution, as the plastic becomes brittle over time and may crack if handled inactively.
In models with a No Frost system or electronic control, the situation is more complicated. Here, the thermostat is often replaced by temperature sensors (thermistors), which are located at different points in the chamber and hidden behind plastic panels. To check them, partial disassembly of the internal lining may be required.
- 🔍 Remove the regulator handle by pulling it towards you (sometimes you need to turn it counterclockwise).
- 🔩 Unscrew the screws securing the decorative trim, if they are visible.
- 🧊 Carefully bend the plastic panel to gain access to the electrical contacts.
- 📸 Take a photo of the wire connection before disconnecting.
If your refrigerator Atlant is equipped with a remote thermostat (located outside, above the door), access to it is even easier. However, such models are less common and belong to older series. In modern conditions, you often have to deal with the internal arrangement.
Access features in two-compressor models
In Atlant refrigerators with two compressors (separately for the refrigerator and freezer), there can be two thermostats. One is responsible for the upper chamber, the second for the lower one. When diagnosing, it is important to determine which kind of malfunction is based on the symptoms (where it is warm or where it is ice).
Test methods: visual inspection and dialing
The most reliable way to check the thermostat is to use a multimeter in resistance measurement mode (Ohm). This method gives an objective result and allows you to determine the performance of the part with high accuracy. Before starting measurements, make sure that the contacts of the device and the circuit being tested are dry and clean.
First, disconnect the wires from the thermostat terminals. Then put the multimeter into dialing mode. Apply the probes of the device to the contacts of the thermostat. If the meter beeps or displays a value close to zero, the circuit is closed. This state corresponds to the compressor being turned on.
Next, you need to check the thermostat’s response to temperature changes. To do this, you can place the sensitive part of the sensor (capillary tube or balloon) in a container of cold water with ice for several minutes. After cooling, the contacts should open and the multimeter should show infinity (one on the screen).
| Status | Multimeter readings | Sound signal | Diagnosis |
|---|---|---|---|
| At room temperature | 0 Ohm (or close) | Yes | Normal (circuit closed) |
| After cooling | ∞ (infinity) | No | Normal (circuit broken) |
| In any state | ∞ (infinity) | No | Breakage of contacts (replacement) |
| After cooling | 0 Ohm | Yes | Stuck contacts (replacement) |
If the thermostat does not respond to the cold and continues to “ring”, then its contacts are stuck and it does not turn off the compressor. If it does not ring even in a warm state, a break has occurred and the refrigerator will not turn on. In both cases, it is necessary to replace the thermostat.
Specifics of checking electronic sensors
Modern models Atlant with electronic control use thermistors instead of mechanical thermostats. These are semiconductor devices whose resistance varies with temperature. It is impossible to check them “by ear” or by simply shorting them - you need a multimeter with the ability to measure resistance in a wide range.
The principle of testing is similar: the resistance is measured at room temperature, then the sensor is cooled, and the measurements are repeated. For a working thermistor, the resistance should change smoothly. Sudden jumps or lack of response indicate a malfunction.
It is important to know the size of your sensor, as they have different characteristics. Installing an incorrect thermistor may result in the refrigerator electronics not functioning properly. Data on normal resistance at a certain temperature can often be found in service documentation or on specialized forums.
⚠️ Attention: Electronic control modules are sensitive to static electricity. When working with sensors in models with electronics, it is recommended to use an antistatic wrist strap or frequently touch a grounded metal object.
Also in electronic systems, it is important to check not only the sensor itself, but also the integrity of the wires going to the control module. Often, a break occurs not in the sensor, but in the bend of the wire or in the connector.
Replacing and setting up a new thermostat
If diagnostics confirm a malfunction, the thermostat must be replaced. When purchasing a new part, pay attention to the markings. For refrigerators Atlant thermostats of the TAM series or imported analogues (Danfoss, Ranco) are often used. They must have similar parameters of capillary tube length and temperature range.
The replacement process begins with dismantling the old device. Carefully disconnect the wires, remembering their location. Then remove the capillary tube from the hole in the chamber. When installing a new thermostat, proceed in the reverse order, being careful not to bend the tube sharply, so as not to damage it.
After installing and connecting all the wires, it is necessary to conduct a test run. Plug in the refrigerator and set the regulator to the middle position. After 10-15 minutes the compressor should start. After reaching a temperature, it should automatically turn off.
- 🛠️ Select an analogue with the same capillary tube length as the old one.
- 🔌 Connect the wires strictly according to the previously made diagram or photograph.
- ❄️ Make sure that the sensitive element fits tightly to evaporator.
- ⏳ Let the refrigerator run for several hours before loading food.
If after replacement the refrigerator does not work correctly (it freezes too much or does not cool enough), you may need to adjust the screws on the thermostat housing. However, this is only done by specialists, as it requires precise instruments for measuring temperature.
Frequently asked questions (FAQ)
Is it possible to temporarily close the thermostat contacts to make the refrigerator work?
Technically, you can close the contacts and the compressor will work. However, in this mode the refrigerator will run continuously until you turn it off manually. This will lead to deep freezing of food and possible compressor failure due to overheating. This method can only be used for short-term testing of the compressor, but not for operation.
Which thermostat is better to buy for Atlant: TAM or imported?
Original thermostats THERE (made in Russia/Belarus) are ideal in size and parameters for refrigerators Atlant. Imported analogues (for example, Danfoss) are often considered more reliable, but may require modification of the fastening or have a different length of the capillary tube. If possible, it is better to look for the original or a high-quality analogue recommended for your model.
Why does the new thermostat not click?
Some modern thermostats operate almost silently, and the click can be barely audible. In addition, if the temperature in the chamber has not yet reached the trigger threshold, there will be no click. If the refrigerator cools and turns off according to the timer or electronics, then everything is working normally.
How can you understand that the problem is not in the thermostat, but in a freon leak?
If there is a freon leak, the refrigerator can work around the clock, trying to gain temperature, but no cold is created. In this case, the condenser (grid at the back) will be barely warm or cold, and not hot, as during normal operation. In this case, the thermostat is working, it just constantly gives a command to cool, since the desired temperature is not reached.
Is it necessary to defrost the refrigerator before replacing the thermostat?
Full defrosting is not always necessary if access to the thermostat is through the internal panel. However, if access to the evaporator is required or there is a risk of water getting on the electrical contacts when the ice melts, it is better to first defrost the unit for 10-12 hours.