Sudden increase in temperature in refrigeration compartment or, conversely, deep freezing of food often indicates a malfunction of the control system. In the equipment of the Belarusian manufacturer Atlant a thermostat is responsible for maintaining the set mode, which may fail over time. Replacing this element on your own is a very real task for a home craftsman who has minimal skills in working with tools and a basic understanding of the structure of household appliances.
Before you begin disassembling the unit, you need to make sure that the diagnosis is correct. If the compressor runs continuously without turning off, or, on the contrary, does not start at all when plugged in, the problem most likely lies in the temperature sensor. Ignoring the symptoms can lead to spoilage of food or failure of a more expensive unit, such as a compressor. In this article we will analyze in detail the process of diagnosing and replacing the thermostat, paying attention to the nuances specific to models. You will learn how to choose the right analogue if the original part is no longer in production, and what safety measures must be followed first. A competent approach will extend the life of your refrigerator and avoid unnecessary costs of calling a technician. compressor.
In this article we will analyze in detail the process of diagnosing and replacing a thermostat, paying attention to the nuances specific to models Atlant. You will learn how to choose the right analogue if the original part is no longer in production, and what safety measures must be followed first. A competent approach will extend the life of your refrigerator and avoid unnecessary costs of calling a technician.
Diagnostics of a thermostat malfunction
The first step in repair is to accurately determine the breakdown. A thermostat is a mechanical or electronic switch that opens the power circuit to the compressor when a set temperature is reached. If this mechanism is stuck in the “on” position, the refrigerator will freeze until a fur coat forms, ignoring the settings. If stuck in the “off” position, the equipment will simply stop cooling.
For an initial check, you can conduct a simple experiment. With the compressor running, turn the control knob to the extreme left position (minimum cold). If the engine continues to hum and does not stop within 10-15 minutes, this is a sure sign of a problem. It is also worth paying attention to the condition of the evaporator: if it is unevenly covered with ice or has “bald spots,” this may indicate problems with the refrigerant, and not just with the sensor.
A more accurate diagnosis is carried out using a multimeter. To do this, you need to get to the contacts of the thermostat and “ring” them. Under normal conditions, at room temperature, the contacts should be closed. If the device shows an open circuit, or if the contacts do not open when the sensing element cools, the part requires replacement.
- 🧊 The compressor runs non-stop, the walls of the chamber are covered with a thick layer of ice.
- 🔇 The refrigerator is silent and does not start, although the power indicator is on.
- 🌡️ The temperature in the chamber does not correspond to the set value of the regulator knob.
- ⚡ When calling with a multimeter, the contacts do not respond to changes in the temperature of the capillary tube.
⚠️ Attention: Before any diagnostics using a power tool or multimeter, make sure that the refrigerator is disconnected from the power supply. Electric shock when working with household appliances is a real threat.
Selection of an analogue and preparation of tools
Thermostats for refrigerators Atlant may differ in the length of the capillary tube, mounting method and operating temperature range. Most often, these models use TAM or K-59 series regulators. It is important to understand that the length of the tube is a critical parameter: one that is too short can be carefully twisted, but it will be extremely difficult to install one that is too long without damaging the housing.
When purchasing a new part, pay attention to the number of contacts and the presence of grounding. Some models have three terminals, where the third is responsible for indicating the operation of the compressor. If you install a thermostat without this terminal, the refrigerator will work, but the indicator light on the panel may not light up. For two-chamber models, it is also important to consider which chamber the regulator is intended for - refrigeration or freezing.
To carry out the work, you will need a minimum set of tools. Pay special attention to safety and accuracy, as the plastic elements of the case can be fragile, especially if the refrigerator has been in use for many years. It is also recommended to have electrical tape and sealant on hand for final insulation of connections.
- 🔧 A set of screwdrivers (Phillips and flat head screwdrivers of different sizes).
- 🔪 A sharp knife or scalpel for carefully removing the insulation.
- 🧤 Gloves to protect your hands from sharp edges metal edges.
- 📸 Smartphone for photographing the wiring diagram before disassembling.
It is worth noting that original thermostats may cost more than their universal counterparts, but their service life is often longer. When choosing, pay attention to the marking: the numbers after the letters (for example, TAM-133) indicate the temperature range of operation. Installing a regulator that is not suitable for the range will lead to incorrect operation: the products will either thaw or freeze.
Removing the old thermostat
The process of removing the faulty part begins with providing access to it. In refrigerators Atlant the thermostat is usually located inside the refrigerator compartment, hidden by a plastic cover or casing. In some older models, access may be from the outside, through the back wall, but this is less common. First, you need to completely defrost the unit to avoid water getting on the electrical contacts.
Remove the temperature control knob by pulling it towards you. Then carefully unscrew the screws holding the plastic panel. Proceed with caution: plastic becomes brittle in the cold, and one awkward movement can lead to cracks. After removing the panel, you will see the thermostat housing, which includes a capillary tube.
The next step is to remove the sensing element. The tube can be fixed in a special hole in the evaporator or simply pressed against it. You need to pull it out smoothly, without jerking, so as not to damage the thin copper tube and not to break the tightness of the cooling system. If the tube is stuck, you can slightly warm the entry point with a hairdryer, but very carefully.
☑️ Preparation for dismantling
After releasing the tube, disconnect the electrical wires. It is extremely important here not to confuse the colors or contact numbers. Even if the wires look the same, their location on the terminals matters. It is best to mark each wire immediately after disconnecting it or take detailed close-up photos. Remove the old thermostat and compare it with the new one, making sure that the seats and tube length match.
⚠️ Attention: The capillary tube of the thermostat is filled with freon or inert gas under pressure. Do not bend it sharply, cut it or pierce it under any circumstances. Damage to the tube will make the thermostat unusable, and in rare cases may lead to splashing of the contents.
Installing a new thermostat
Installation of the new part is carried out in the reverse order of dismantling. Start by installing the capillary tube into the mounting hole. It should fit tightly, but without excessive force. The depth of the tube into the evaporator affects the accuracy of the temperature readings, so try to repeat the configuration of the previous element. If the tube is longer than the original, its excess is carefully laid along the chamber wall.
Connecting the electrical part requires maximum care. Use previously taken photographs as a reference. The wires are connected to the corresponding terminals of the new thermostat. If the terminals on the new device are different in shape, it may be necessary to replace the end switches (“chips”), but it is better to avoid twisting, using soldering or special clamps for reliable contact.
After connecting the wires, check the reliability of the fixation. Lightly tugging the wires will help identify weak connections. Then reinstall the thermostat housing, securing it with screws. Make sure that no wires get under the fasteners and will not be pinched during assembly.
| Parameter | Original | Universal analogue | Importance of matching |
|---|---|---|---|
| Tube length | 0.7 - 2.5 m | You can twist the excess | High |
| Contact type | 2 or 3 outputs | Must match | Critical |
| Temperature range | Depends on the model | Small deviations are acceptable | Average |
| Tube diameter | Standard | Must enter the hole | High |
What to do if the wires are mixed up?
If you connected the wires incorrectly, the refrigerator may either not start, or a short circuit may occur when turned on. In the worst case, the compressor will burn out. Therefore, the rule “photographed - turned off” is the gold standard for repairs. If doubts remain, it is better to find the electrical diagram for your specific model on the Internet by serial number.
The final stage of mechanical assembly is the installation of the plastic trim and the regulator knob. Make sure the knob rotates freely and the shift clicks are heard clearly. This will confirm that the mechanism is installed correctly and nothing interferes with its operation.
Checking functionality and setting
After assembling the refrigerator, do not rush to load food. Turn on the unit and set the thermostat knob to the middle position. During the first hour of operation, listen for sounds: the compressor should start, run for a certain time and then turn off. Cyclic operation is the main sign of the health of the thermoregulation system.
To accurately adjust the temperature, it is recommended to use an external thermometer placed in a glass of water in the center of the chamber. After 5-6 hours of operation, the thermometer readings should correspond to the set mode (usually +2...+5°C for the refrigerator compartment). If the temperature is different, adjust the position of the tube or replace the thermostat with a model with a different range.
Pay attention to the duration of the operating cycles. If the refrigerator runs too long or turns on too often, this may indicate an incorrect thermostat or a freon leak. Normally, the work and rest cycle should be approximately equal, or work may take a little longer than idle time.
- ✅ The compressor turns on and off automatically.
- ✅ The temperature in the chamber stabilizes within the specified limits.
- ✅ There is no excess condensation or condensation on the walls of the chamber frost.
- ✅ There are no extraneous clicks or hums that are not typical for normal operation.
Typical errors when replacing
The most common mistake is ignoring the length of the capillary tube. Trying to push a long tube into a small hole can cause it to break. There is gas inside the tube, and if the patency is impaired, the thermostat will stop responding to temperature changes. In such cases, you have to either look for another model, or very carefully, observing the bending radius, lay the excess.
The second common mistake is poor contact in the electrical circuit. Oxidized terminals or loose wires can cause sparking. Over time, this leads to burnt contacts and repeated failure. Clean the contacts to a metallic shine and use clamp terminals to make a secure connection.
Some technicians try to “repair” an old thermostat by disassembling its housing. This is absolutely not worth doing. Springs and membranes are calibrated at the factory, and it is impossible to restore the accuracy of operation at home. In addition, the tightness of the bellows is broken, which makes the device useless.
⚠️ Attention: If after replacing the thermostat the refrigerator started working, but after a while it stopped cooling again, the problem may not be in the sensor, but in the refrigerant circulation system. Perhaps during the replacement process you accidentally damaged the tube or a blockage occurred. In this case, diagnostics by a professional is required.
Frequently asked questions (FAQ)
Is it possible to use a thermostat from another manufacturer, for example, Danfoss or Ranco?
Yes, you can. The main thing is the coincidence of the mounting dimensions, the length of the capillary tube and the temperature range. Many manufacturers use standardized fasteners. However, before purchasing, be sure to compare the markings and appearance of the contacts.
Why, after replacing the thermostat, does the refrigerator freeze less than before?
This may be due to the incorrectly selected temperature range of the new regulator. It is also possible that the sensing element is not seated tightly against the evaporator. Check the tightness of the tube and, if necessary, tighten it.
Is it necessary to recharge the freon after replacing the thermostat?
No, the refrigerant system remains sealed. The thermostat is an electrical component, and replacing it does not affect the freon circulation circuit unless you accidentally damaged the evaporator tubes during installation.
How can you tell if the thermostat is lying and showing the wrong temperature?
Use an external thermometer. If the average value is set on the handle, and the food freezes or, conversely, spoils, then the calibration is broken. In mechanical thermostats, recalibration is impossible; replacement is required.
How long does the thermostat in an Atlant refrigerator last on average?
The average service life is 5-7 years of active use. However, with frequent voltage drops in the network or sudden temperature changes, the service life may be reduced. Installing a voltage stabilizer can extend the life of the electronic components of the refrigerator.