The situation when Atlant refrigerator ceases to maintain the set temperature often confuses the owner. The food begins to deteriorate, an ice crust forms on the walls or, conversely, the chamber freezes too much. In most cases, the culprit of such anomalies is a failed thermostat, which ceases to correctly read the temperature inside the chamber.
You should not immediately panic and call a technician, since independently replacing this element is quite possible for a person who knows how to handle a screwdriver and understands the basics of electrical circuits. Thermostat is a mechanical or electronic device that opens and closes the electrical circuit of the compressor depending on the sensor readings. If it is broken, the compressor either works without stopping or does not turn on at all.
Before proceeding with disassembly, you need to make sure that the problem lies precisely in the regulator, and not in a freon leak or a malfunction of the start relay. Carry out initial diagnostics: if when you turn the regulator knob to the “maximum” or “minimum” position, a characteristic click is not heard, and the compressor is silent, most likely it is required Replacing the thermostat. Next, we will analyze in detail the process of diagnosing and installing a new element.
The principle of operation and signs of malfunction of the thermostat
To perform a quality repair, you need to understand how this unit works. In refrigerators Atlant mechanical thermostats with a capillary tube are most often used. Inside the bellows is a temperature-sensitive gas or liquid. As the chamber cools, the pressure inside the tube drops and the contacts open, turning off the compressor. When heated, the process occurs in the reverse order.
If this mechanism is disrupted, the refrigerator behaves unpredictably. The main sign of a breakdown is the continuous operation of the motor-compressor without entering the shutdown mode. In this case, the food in the main chamber may freeze, and a thick layer of snow will form on the back wall. This indicates that the contacts are “stuck” in the closed position and do not open even when a low temperature is reached.
⚠️ Attention: If the refrigerator, on the contrary, does not turn on at all, and when the thermostat contacts are closed manually (in compliance with safety precautions), the compressor starts, it means that the circuit is broken inside the regulator itself.
Another one a symptom may be turning the unit on and off too often. This indicates that it thermostat works incorrectly, with a large error, or “jerks” at boundary values. In such cases, simply adjusting the screws will no longer help; a complete replacement of the unit with a working one is required.
It is also important to distinguish between mechanical and electronic control systems. In models with electronics, the role of a thermostat is performed by a temperature sensor, which transmits signals to the control module. The diagnostic principle is similar, but the design and testing methods are different. We are considering the classic option with a mechanical regulator, which is most common in household models Atlant.
Diagnostics and preparation for replacement
Before buying a new part and disassembling the refrigerator, it is necessary to carry out an accurate diagnosis. Incorrect identification of a malfunction will lead to unnecessary costs and wasted time. The most reliable way to check thermostat is to ring its contacts with a multimeter in resistance measurement mode.
First you need to dismantle the old regulator. Remove the temperature control knob, unscrew the mounting screws (if any) and carefully remove the thermostat housing from its seat. Pay attention to the condition of the capillary tube: it should not have kinks, cracks or signs of corrosion. Damage to the tube makes the entire assembly unsuitable for use.
- 🔌 Disconnect the refrigerator from the power supply - this is the first and main safety rule for any repair work.
- 🧊 Defrost the chamber if there is a lot of ice inside so that water does not get on the electrical contacts during disassembly.
- 🔧 Prepare a multimeter, pliers, screwdrivers and a new part that matches your model.
After removing the thermostat, disconnect the wires from it. Remember or take a photo of the connection diagram, since the colors of the wires may vary in different modifications. Usually there are two or three. If there are three contacts, then the third wire often goes to the signal light or serves as grounding of the case.
Now let's move on to measurements. Set the multimeter to dialing mode. At room temperature, the contacts of a normally open thermostat should be open (resistance is infinite). If you lower the sensitive tube into cold water (with ice), the contacts should close and the device will beep. If this does not happen, or if the contacts do not open when heated, the part is faulty.
Is it possible to check the thermostat without a multimeter?
There is an exclusion method, but it is less accurate. You can temporarily short-circuit the wires going to the thermostat with an insulated conductor. If, after being plugged in, the refrigerator starts working and starts freezing, then the problem was in the regulator. However, this method does not provide a 100% guarantee, since it does not check the accuracy of operation.
Selecting a suitable thermostat model
The spare parts market for refrigerators Atlant offers many options for thermostats. They may differ in the length of the capillary tube, operating temperature range, the presence of additional contacts and housing geometry. An incorrectly selected part may not work correctly: the refrigerator will either undercool or work with overload.
The key parameter is the marking. An alphanumeric code is always marked on the body of the old thermostat (for example, TAM-133, K-59, K-57). It is this code that you need to look for a replacement. If the marking is erased or unreadable, you will have to select an analogue based on appearance, tube length and parameters of your refrigerator.
| Marking | Refrigerator type | Tube length (cm) | Features |
|---|---|---|---|
| TAM-133 | Single-chamber | 0.73 - 1.3 | Standard for old models |
| K-59 | Double-chamber | 0.75 - 2.5 | The most common type |
| K-57 | Freezer compartment | 2.0 - 3.0 | For low temperatures |
| TAM-145 | Two-chamber | 0.73 - 1.3 | Analogue K-59, often interchangeable |
The length of the capillary tube plays a critical role. If the tube is too short, it will not reach the required place in the evaporator, and the thermostat will “lie” about the temperature. If it is too long, it will have to be carefully laid out to avoid creases, which can be difficult in tight spaces.
⚠️ Note: Specifications and parts availability may vary. Before purchasing, check the markings on the body of your part with the manufacturer’s catalog or a consultant at a spare parts store.
When purchasing, pay attention to the quality of the contacts and the reliability of the case. Cheap Chinese analogues may fail in a few months. It is better to give preference to original spare parts Atlant or proven European brands, such as Danfoss or Thermo.
Step-by-step instructions for replacing the thermostat
The replacement process requires care and attention. The main task is not to damage the capillary tube of the new thermostat and to connect the electrical part correctly. Any mistake can lead to a short circuit or incorrect operation of the refrigerator.
Start by dismantling the old unit. Remove the plastic cover covering the thermostat. It is usually held in place by latches or screws. In some models Atlant To gain access you need to remove the top cover of the refrigerator or decorative panel. Proceed with caution, the plastic on old refrigerators can be fragile.
☑️ Algorithm for replacing the thermostat
After removing the old thermostat, carefully pull the capillary tube out of the evaporator. It can be attached with special clamps or simply fit into the hole. Insert the new tube smoothly, without jerking. If it is tight, you can lightly lubricate the hole with silicone grease, but under no circumstances use force.
Connecting the wires is the most critical step. Use the diagram you photographed during disassembly. If the color markings do not match, refer to the location of the contacts. The wires must be securely fixed in the terminals. If the old terminals are oxidized or damaged, it is better to replace them with new ones.
After connecting, reassemble the housing in the reverse order. Make sure all screws are tight and the plastic panels are in place without any gaps. The capillary tube should not touch moving parts or sharp metal edges, which could damage it when the compressor vibrates.
Configuring and checking the operation of the system
After installing the new thermostat refrigerator, you must plug it into the network. Don't rush to load products right away. Let the unit run idle for at least 2-3 hours. This will allow the system to enter operating mode and stabilize the temperature.
It is better to set the initial setting of the regulator knob to the middle position. Usually this is a “3” or “4” mark on the scale. Depending on the model Atlant, the scale may have different gradations. The task is to ensure that the compressor turns on and off with a certain frequency.
- ❄️ If the refrigerator freezes poorly and the compressor works little, try turning the knob towards higher values.
- 🧊 If the food freezes and the compressor hums without break, reduce the power with the regulator.
- ⏱️ Normal operating cycle: 10-15 minutes of work, 20-30 minutes of rest (depending on the load and temperature in the room).
Pay attention to how the tube behaves. When installed correctly, it should fit snugly against the evaporator at the mounting location (usually a special clamp or hole). Poor contact will lead to a delayed thermostat response and temperature fluctuations.
Common mistakes during self-repair
DIY Repair is always a risk of making a mistake, especially if you are doing it for the first time. Knowing common mistakes will help you avoid them and replace them. One of the most common problems is damage to the capillary tube during installation.
A thin copper tube is very sensitive to creases. Even a microscopic crack will cause the sensitive substance to leak and the thermostat will stop working. Therefore, carry out all manipulations with the tube slowly, fixing it with your fingers and not with a tool.
⚠️ Attention: Never check the tightness of the capillary tube by trying to blow it with your mouth or connect it to a compressor. Inside there is a special substance under pressure, a violation of the seal is fatal to the part.
Another error is poor contact in the electrical circuit. If the wires are not inserted into the terminals all the way or are oxidized, the plastic at the contact point will begin to heat up, which can lead to melting and a fire. Strip the ends of the wires to a shine and crimp the terminals tightly.
Also, users often forget about grounding. In three-prong thermostats, the third wire often goes to the housing. If it is not connected, a potential may appear on the metal body of the refrigerator, which is dangerous for humans. Always check for grounding.
What should you do if the new thermostat clicks, but the compressor does not start?
This may mean that the problem is not in the thermostat, but in the start relay or the compressor itself. Either you connected the wires incorrectly. Check the connection diagram again and test the circuit to the compressor.
FAQ: Frequently asked questions
Is it possible to replace the Atlant thermostat with an analogue from another manufacturer?
Yes, it is possible if the mounting dimensions, capillary tube length and temperature range match. For example, thermostats Klixon or Danfoss often become an excellent replacement for original parts, sometimes even surpassing them in terms of service life.
Why does the refrigerator freeze, even if the regulator is turned to minimum?
This is a sure sign that the thermostat contacts “stuck” in the closed state or the internal spring has burned out. It is also possible that the thermostat is selected incorrectly (the shutdown threshold is too low). The part needs to be replaced.
Is it necessary to evacuate the system after replacing the thermostat?
No, the thermostat is located outside the freon circulation circuit. You only change the electrical part and the sensing element. Intervention in the cooling system (pipes, compressor, condenser) is not required, so evacuation is not necessary.
How to understand that the thermostat is electronic and not mechanical?
If you have a digital display and buttons on the control panel, and not a rotary knob, then you have an electronic module. In this case, the “thermostat” is a temperature sensor (thermoresistor), which is changed using a different technology, often requiring disassembling the inner lining of the chamber.
How long does a new thermostat last on average?
A high-quality thermostat, when installed correctly, lasts 5-7 years or more. The service life depends on the number of on-off cycles and operating conditions (humidity, power surges in the network).