How to replace the thermostat in an Atlant two-chamber refrigerator with your own hands

The appearance of puddles on the kitchen floor or, conversely, complete defrosting of food in the refrigerator compartment often signals a failure of the temperature control system. In two-chamber models Atlant a small device is responsible for maintaining the set mode - a thermostat (thermostat). It is he who reads the readings of the medium and gives the command to the compressor to turn on or stop. If this mechanism breaks down, the refrigerator stops responding to changes in temperature inside the chambers, which leads to spoilage of food or excessive energy consumption.

Independent replacement of this unit is quite within the capabilities of a home craftsman with basic skills in handling tools. However, before proceeding with disassembly, it is necessary to accurately verify the diagnosis, since symptoms of a thermostat malfunction can easily be confused with a freon leak or a breakdown of the start relay. In this article, we will analyze in detail the process of diagnostics, selection of spare parts and step-by-step replacement of the thermostat in refrigerators Atlant with two chambers.

The main goal is to restore the normal operating cycle of the unit, while avoiding damage to the fragile evaporator tubes or violation of the tightness of the system. It is important to understand that working with electrical appliances requires compliance with safety precautions, and the accuracy of actions directly affects the durability of the repair. Below is a complete algorithm of actions for successfully restoring the functionality of your refrigerator.

Symptoms of malfunction and initial diagnostics

The first alarm bell indicating problems with thermostatis the uncharacteristic behavior of the compressor. It can work continuously without turning off for hours, or, conversely, remain silent for days until the food in the chamber turns into an ice block. In two-chamber Atlantakhwhere a drip defrosting system is often used, the absence of cyclic engine stops leads to freezing of the rear wall and disruption of heat transfer.

Another obvious symptom is the incorrect temperature of the products at standard position of the regulator knob. If you turn the knob to maximum cold, but it’s still warm inside, or if the food freezes at minimum settings, it means that the device is broken or its contacts are stuck. It is also worth listening to the characteristic click: a working thermostat makes a quiet but clear sound when switching modes, while a faulty one may be silent or make a crackling sound. calibration the device is broken or its contacts are stuck. It is also worth listening to the characteristic click: a working thermostat makes a quiet but clear sound when switching modes, while a faulty one may be silent or make a crackling sound.

⚠️ Attention: Before starting any diagnostics, be sure to disconnect the refrigerator from the power supply. Working with live electrical components is lethal and can result in a short circuit.

The method of elimination is often used as a final check. If, when you tap the regulator knob, the compressor begins to hum, this is a sure sign that the contacts inside have oxidized or burnt. However, you should not rely on this method alone, as it does not provide a guarantee. A more reliable way is to test the contacts with a multimeter, but this will require partial disassembly of the unit.

Necessary tools and preparation of the workplace

Replacing the thermostat in the refrigerator Atlant does not require professional stationary equipment, but a certain set of tools must be prepared. You'll need Phillips and flat-head screwdrivers to remove the panels, pliers to work the clips, and perhaps a knife to carefully remove any old caulk or insulation. It is also highly desirable to have a multimeter for checking circuits.

Particular attention should be paid to the organization of lighting. Refrigerator interiors, especially the dome light and evaporator areas, are often dark, and poor lighting can cause accidental damage to tubes or wires. Use a headlamp or portable lamp to keep your hands free to handle parts.

The work area should be clean and dry. Cover the floor in front of the refrigerator with thick cloth or cardboard to prevent small screws and parts from getting lost and scratching the floor covering. Prepare a container in advance for folding fasteners, sorting them by disassembly stages.

Choosing a suitable thermostat model

The spare parts market offers many analogues, but for refrigerators Atlant it is critically important to choose a thermostat with the correct temperature characteristics. Most often, these models use thermostats of the TAM series (for example, TAM 133) or K59. The difference between them is the length of the capillary tube and the on/off temperature range.

The capillary tube is a thin copper or aluminum hose that transfers temperature from the evaporator to the mechanism itself. If the length of the tube is shorter than the original, it may not be enough for proper installation, and if it is longer, you will have to carefully twist the excess without bending or damaging it. Damage to the capillary will lead to leakage of freon gas from the thermostat bellows, and the device will stop working.

When purchasing, pay attention to the markings of the contacts. They are usually designated by numbers 3, 4 and 6. For most two-chamber refrigerators Atlant the connection diagram is standard, but double-checking the markings on the body of the old device and the new analogue is mandatory. An incorrect connection may result in the refrigerator not turning off or not starting at all.

Removing the old thermostat

The replacement process begins with access to the unit. In two-compartment refrigerators Atlant the thermostat is usually hidden under a plastic cover at the top of the refrigerator compartment or inside the lampshade. First you need to remove all the shelves and drawers that interfere with access and unscrew the screws securing the decorative panel.

After removing the panel, you will see the thermostat itself, often enclosed in a plastic case or mounted on a metal bracket. Carefully remove the temperature control knob by pulling it towards you. Next, disconnect the wires: they may be held on the terminals or twisted into insulating caps. Remember or write down which wire is connected where, using color markings.

The most delicate stage is removing the capillary tube from the channel in the evaporator. The tube passes through a special hole in the back wall of the chamber and is attached to the evaporator using a clamping bar or bracket. Don't pull the phone too hard! It may freeze or get stuck. Carefully unscrew the fasteners and slowly, with smooth movements, pull the tube out through the hole in the housing.

⚠️ Attention: The capillary tube is very thin and fragile. If it is strongly bent or jerked, it may burst, which will lead to failure of the entire thermostat. Move slowly and without sudden force.

Installing and connecting a new thermostat

Installation of a new device is carried out in the reverse order of dismantling. First, you need to carefully thread the capillary tube of the new thermostat through the hole in the chamber wall. The length of the tube must match the original; if it is longer, the free end should be carefully rolled into a ring with a diameter of at least 4-5 cm and placed in the free space behind the panel, avoiding sharp edges.

Fix the sensitive element (end of the tube) on the evaporator in the same place where the old sensor was fixed. For fixation, use a standard clamping bar or special heat-resistant glue, if the design allows. The contact between the tube and the surface of the evaporator must be tight, otherwise the thermostat will incorrectly read the temperature.

Connect the electrical wires according to the previously made diagram or markings on the case. Typically, the ground wire (yellow-green) is connected to the case or a separate contact, and the power wires are connected to the terminals 3 i 4. Make sure the connections are secure and not loose. After this, install the thermostat in its seat and secure it with screws or latches.

What to do if the new thermostat does not click?

Sometimes new thermostats come from the factory in the off state or with “stuck” contacts. Try turning the control knob from minimum to maximum and back several times. If there is no click, lightly tap the body of the device - this may help the contacts fall into place. If this does not help, check the continuity of the circuit with a multimeter.

Setting up and testing the operation of the refrigerator

After assembling all the panels and returning the handles to their place, you can begin testing. Plug in the refrigerator. In the first minutes of operation, you may hear the humming of the compressor - this is normal. The thermostat should close the circuit and start the engine, since the temperature in the chamber is now high.

Let the refrigerator operate for several hours without loading food. Check the temperature in the chambers periodically. If everything is done correctly, the compressor should periodically turn off when the temperature reaches the set value, and turn on again when it rises. Cyclic operation is the main sign of system health.

If the refrigerator is operating normally, load it with food. During the first 24 hours, it is recommended to periodically check the temperature to ensure that the food is not overcooling or thawing. If necessary, adjust the position of the thermostat knob.

Typical errors when replacing

One ​​of the most common errors is incorrect positioning of the capillary tube. If it does not fit tightly to the evaporator or is located in an area where the temperature does not correspond to the average temperature in the chamber, the refrigerator will not work correctly. For example, the tube may “heat up” from its proximity to the chamber wall, and the thermostat will turn off the compressor, preventing the food from freezing.

Also often, craftsmen forget to check the tightness of electrical connections. Poor contact in the terminals leads to sparking, heating and eventual melting of the wiring, which creates a risk of fire. All connections must be tight; if necessary, use crimp terminals rather than just twisting.

Another mistake is using the wrong analogue. Installing a thermostat with a different temperature range (for example, for a freezer instead of a refrigerator) will result in the refrigerator either not turning off at all or maintaining a temperature unsuitable for storing food. Always check the markings.

⚠️ Attention: Technical characteristics and connection diagram may vary slightly depending on the specific modification of the refrigerator Atlant. Always check the technical documentation of your model or the markings on the old device before installing a new one.

Frequently asked questions (FAQ)

Is it possible to replace the thermostat with a universal analogue?

Yes, you can, if the main parameters are the same: the length of the capillary tube, the temperature range of operation and the location of the contacts. Universal thermostats often have an adjustable range, which allows them to be adapted to different models, but requires precise adjustment.

Why does the refrigerator run longer than usual after replacement?

This may be due to incorrect installation of the capillary tube (poor thermal contact) or the fact that the new thermostat has slightly different calibration data. Also check the tightness of the door seal - if it allows heat to pass through, the compressor will work harder.

Is it necessary to release freon from the refrigerator to replace the thermostat?

No, it is not necessary. The thermostat is located in an electrical circuit and its sensitive element (capillary) is not connected to the internal refrigerant circulation system. Replacement is carried out without breaking the tightness of the freon circuit.

What to do if the capillary tube of the new thermostat is longer than the old one?

The excess tube cannot be cut off. It must be carefully twisted into a ring with a diameter of at least 4-5 cm and placed in the free space behind the back panel or in a specially designated place, making sure that it does not touch the moving parts of the compressor or hot elements.