How to remove and replace the thermostat in the Atlant refrigerator

Brand refrigerators Atlant are deservedly popular due to their reliability, but even the most High-quality equipment requires repair over time. One of the most common causes of temperature violations is the failure of the thermostat, which ceases to respond correctly to changes in temperature inside the chambers. If you notice that the unit stops turning off, works without interruptions, or, conversely, does not start the compressor, the products begin to deteriorate, then most likely the problem lies in this unit.

Independently replacing this element is a completely solvable task for a person with basic skills in handling tools, but it requires care and compliance with safety precautions. Improper removal or installation of a new sensor can lead to more serious damage or even a short circuit. In this article, we will analyze the dismantling process in detail, consider the design features of different models Atlant and give recommendations that will help avoid typical mistakes during repairs.

Before starting disassembly, you must clearly understand that a thermostat is not just a switch, but a complex device that is sensitive to mechanical influences. Capillary tube, extending from the body, is extremely thin and is easily damaged if handled carelessly. Any microcrack will lead to freon leakage from the thermostat system, and the new device will have to be thrown away before it is installed. Therefore, all manipulations should be carried out without haste, using a working tool.

Diagnostics of a thermostat malfunction

Before disassembling the refrigerator, you should make sure that the problem is really in the thermostat, and not in the compressor or start relay. The main sign of a malfunction is the incorrect operation of the compressor: it either does not start at all, or it works continuously, without turning off even when the products are severely overcooled. If, when turning the control knob to the “Off” or “0” position, the engine continues to hum, this is a sure sign that contacts inside the thermostat they are stuck in a closed state.

There is a simple method of initial testing that does not require disassembling the housing. Try turning the thermostat knob sharply counterclockwise until it clicks. If there is no characteristic sound of contact opening, but the compressor continues to operate, the likelihood of breakdown is high. It is also worth paying attention to the temperature in the refrigerator compartment: if a “coat” of ice forms on the back wall, and the food in the lower drawers freezes, this indicates that the sensor is not sending a signal to turn off.

⚠️ Attention: If the compressor does not start at all and does not make any sounds, do not rush to blame the thermostat. First, check the presence of voltage in the network and the serviceability of the starting relay. Sometimes the problem lies in a broken power circuit, and not in the temperature controller itself.

For more accurate diagnostics, professionals use a multimeter, checking the resistance at the thermostat contacts at different temperatures. However, in domestic conditions, the elimination method is often used: if the compressor is working properly, and the refrigerator “does not see” the start or stop command, replacing the regulator is the most logical step.

Necessary tools and preparation for work

High-quality repairs are impossible without the right tool. To remove the thermostat in refrigerators Atlant you will need a minimum kit that any home craftsman will have. The main requirement for the tool is serviceability and safety, since the work will be carried out in close proximity to electrical contacts and plastic elements that are easily damaged.

First of all, prepare screwdrivers. You will need a flathead screwdriver for working the latches and terminals, as well as a Phillips screwdriver (usually PH2 size) for removing the mounting screws. A plastic spatula or old plastic knife will be useful for carefully prying off the decorative panels without scratching them. Don't forget about pliers with narrow jaws for working with wires and electrical tape or heat shrink for insulating connections.

Below is a list of tools that are guaranteed to be needed in the process:

• 🔧 Screwdrivers (flat and Phillips) - the main tool for dismantling.
• 🔌 Multimeter or an indicator screwdriver - to check the presence of voltage.
• ✂️ Pliers or side cutters - for working with wires and clamps.
• 🧤 Gloves - to protect your hands from sharp metal edges.

Pay special attention to the lighting of the workplace. The internal cavities of the refrigerator, especially in older models, may be poorly lit, and it is critical to consider the markings of the wires and the condition of the contacts. Wire insulation over time they become dull and crack, so any manipulations with them require visual inspection. If you have a flashlight, secure it so that the light falls directly on the work area.

Removing the thermostat in refrigerators with an upper chamber

In classic models Atlant, where the freezer is located on top, The thermostat is most often located inside the refrigerator compartment. It is accessed through the lampshade or a separate lining on the ceiling of the chamber. Before starting any work, it is absolutely necessary to disconnect the unit from the power supply by unplugging the plug from the socket to prevent electric shock.

The dismantling process begins with removing the lampshade. Depending on the model, it may be screw-mounted or held on with latches. Carefully pry up the plastic case with a screwdriver, being careful not to damage the fragile plastic, which becomes especially brittle in the cold. Under the lampshade you will see the thermostat itself, enclosed in a plastic casing, and the capillary tube coming out of it Then you should proceed according to the following algorithm:which goes into the evaporator.

Next you should proceed according to the following algorithm:

1. Unscrew the screws securing plastic cover of the thermostat.
2. Remove the regulator handle by pulling it towards you (sometimes it is held on a locking ring).
3. Carefully remove the thermostat body from the seat.
4. Take a photo of the wire connection diagram so as not to confuse them when assembly.
5. Disconnect the wires from the terminals, having previously marked them with a marker.

⚠️ Attention: The capillary tube must not be bent, twisted or pulled with force. There is a sensitive liquid or gas inside, and a leak will render the device inoperable. Bend it only as a last resort and with a large radius.

After disconnecting the wires, you must release the capillary tube from the mounting clips on the evaporator. It is usually secured with plastic clamps or metal brackets. Be careful not to damage the aluminum evaporator tubes, which are also very sensitive to mechanical stress. If the tube is hidden in thermal insulation, carefully pull apart the material without tearing it.

Removing the sensor in models with a bottom freezer

In modern refrigerators Atlant with a bottom freezer, the design may differ. Here, the thermostat is often located not inside the chamber, but outside - in the upper part of the housing, hidden behind a decorative panel or at the end of the door. This is done for ease of adjustment, but complicates the replacement process, since partial disassembly of the outer lining is required.

To access the unit in such models, you usually need to remove the top cover of the refrigerator or the side panel. Fastening can be carried out using self-tapping screws, which are sometimes hidden under decorative plugs. Carefully inspect the upper end of the case: if you do not see screws, perhaps the panel is held on by powerful latches that need to be pressed out with a plastic spatula. Plastic latches older models may have brittle, so apply the force evenly.

A feature of such models is a longer capillary tube, which passes through the entire body of the refrigerator to the evaporator in the upper part of the refrigeration chamber. When dismantling, it is important not to snag or damage other elements, for example, backlight wiring or No Frost system sensors, if present. Often the tube is fixed along the inner wall, and its path must be tracked visually or by touch.

The table below will help you navigate the typical locations of thermostats for different series Atlant:

When working with external thermostats, the problem of contact oxidation due to condensation, which can accumulate in the upper part of the case, is often encountered. Before installing a new device, it is recommended to inspect the terminal block and, if necessary, clean the contacts with alcohol. This will ensure reliable electrical contact and extend the service life of the new component.

Connection diagram and wire marking

One ​​of the most critical aspects of replacement is the correct connection of the wires. Thermostats typically use three or four pins, and getting them mixed up can result in a short circuit or the refrigerator not operating properly. The color marking of wires in equipment Atlant may vary depending on the year of manufacture, so relying only on color is dangerous.

The standard connection diagram assumes the presence of the following groups of contacts: power (phase), output to the compressor and, in some models, output to a light bulb or defrost sensor. Most often, the red or brown wire is the phase coming from the network. Yellow or green with a stripe - grounding (if available). The black or blue wire goes directly to starting the compressor. However color range Chinese and European components may differ.

Here are the basic rules to follow:

• 📸 Be sure to take a photo of the connection before disconnecting the wires.
• 🏷️ Number or mark each wire with a marker before removing.
• 🔍 Compare the markings on the body of the old and new thermostat (numbers 1, 2, 3, 4).
• ⚡ Check that there is no voltage on the wires before touching.

If you purchased a universal thermostat that does not have an exact analogue in the shape of the body, you may need to modify the seat or lengthen the wires. In this case, the twisting points must be carefully soldered and insulated with heat-shrinkable tubing. Using simple electrical tape in a refrigerator is undesirable, since the glue dries over time and the insulation can slip.

Installing a new thermostat and checking operation

After successful dismantling and preparing the new element, you can begin installation. Installation is carried out in the reverse order, but taking special precautions. The main thing is to lay the capillary tube correctly. It should fit snugly against the evaporator in the same place and with the same degree of pressure as the old one. For fixation, special clamps or brackets are often used, which need to be tightened all the way, but without fanaticism.

After securing the tube and connecting the wires according to the previously made marks, install the thermostat housing in place. Make sure it fits snugly and doesn't wobble. If your model has a rubber seal around the stem, check its integrity and fit. This will prevent moisture from getting inside the mechanism and the formation of condensation on the contacts.

The final stage is checking the functionality of the system:

1. Plug in the refrigerator.
2. Set the regulator knob to the middle position.
3. Listen: after a few seconds a click should be heard and the compressor will start.
4. Allow the unit to operate until the set temperature is reached and make sure that it turns off.

⚠️ Attention: If after installing a new thermostat the refrigerator does not work correctly (for example, it does not turn off or turns on too often), the new device may have a different temperature characteristic. Make sure that you buy a thermostat with exactly the same markings as the old one.

During the first hours of operation of the new thermostat, it is recommended to periodically check the temperature in the chambers using an external thermometer. This will help ensure that the on/off cycle is correct. If all the parameters are in order, you can assemble the decorative panels and return the refrigerator to full operation.

Is it possible to use a thermostat from another refrigerator model?

The use of analogues is possible, but only if the basic parameters match: the length of the capillary tube, the type of contacts and the temperature range of operation. Universal thermostats often require adjustment to the length of the tube, which is difficult and dangerous to do at home. It is better to look for the original part number or a complete analogue in the catalog.

What to do if the new thermostat clicks, but the compressor does not start?

This may indicate a malfunction of the compressor start relay or the engine itself. It is also worth checking whether voltage is coming to the compressor. It is possible that when replacing you accidentally damaged the wiring or did not secure the terminals properly. Check the circuit with a multimeter.

How can you tell if the thermostat is lying and shows the wrong temperature?

If the food in the refrigerator compartment freezes or, on the contrary, spoils, although the knob is in the middle position, it means the calibration is broken. You can check this by placing a thermometer inside the chamber and comparing its readings with the actual state of the products and the operating cycles of the compressor.

Is it necessary to defrost the refrigerator before replacing the thermostat?

Yes, complete defrosting is required. Ice can interfere with access to fasteners, and moisture can be dangerous when working with electricity. In addition, warm plastic is more elastic and less likely to crack during dismantling. Let the unit stand unplugged for at least 10-12 hours.