How to fix the thermostat in the Atlant refrigerator

A sudden increase in temperature in the refrigerator compartment or, conversely, the formation of an ice crust on food often indicates a malfunction of the climate control system. Thermostat (or thermostat) is the main element responsible for maintaining the specified cooling parameters. When this unit fails, the compressor either stops turning on at all or works without interruptions, which inevitably leads to food spoilage and increased energy bills.

Refrigerators Atlant, popular due to their reliability, are still subject to wear and tear of parts, especially if the unit has been in operation for more than 7-10 years. Replacing a thermostat is one of the most common DIY repair procedures, which does not require deep knowledge of electrical engineering, but requires care and compliance with safety precautions. In this article, we will look at how to correctly diagnose a breakdown, select the appropriate spare part and install it so that your refrigerator works like new again.

Before you start disassembling, you need to make sure that the problem lies precisely in the sensor, and not in a freon leak or a malfunction of the start relay. If the motor-compressor hums, but no cold is generated, or the unit is silent even when the regulator knob is turned to the maximum position, most likely it is the culprit. It is important to understand that ignoring the problem can lead to failure of the compressor itself due to overheating or water hammer. thermal sensor. It is important to understand that ignoring the problem can lead to failure of the compressor itself due to overheating or water hammer.

The principle of operation of the thermostat and signs of malfunction

The thermostat is a mechanical or electronic device that responds to changes in temperature inside the chamber. Classic models Atlant use a capillary type, where the sensitive tube is filled with gas or liquid. As the medium cools, the pressure inside the tube drops, the contacts open, and the compressor turns off. When the temperature rises, the process is reversed. Understanding this cycle helps to quickly identify anomalies in operation.

Symptoms of a breakdown can be different, and they are not always obvious at first glance. Sometimes the refrigerator simply stops freezing, and in other cases it begins to freeze too much, turning vegetables into ice blocks. Diagnostics should begin with a visual inspection and analysis of the behavior of the equipment in different operating modes.

⚠️ Attention: If you notice that the refrigerator body It gets very hot, but it’s warm inside, don’t rush to change the thermostat. This may be a sign of a blockage in the system or a malfunction of the compressor, which requires the intervention of a technician with the equipment.

The main signs indicating the need to check or replace the thermostat:

• 🧊 The compressor works continuously, without turning off even at night, and the temperature in the chamber drops below -20°C.
• 🔇 The refrigerator is completely silent, the light is on, but the engine does not start even when the regulator is set to maximum.
• 💧 There is constant ice inside the chamber or, conversely, food begins to deteriorate due to insufficient cold.
• ⚡ Frequent cycles of turning the motor on and off at short intervals (less than 2-3 minutes).

It is important to note that in two-chamber models with a system No Frost or a separate cooling circuit, there may be several thermostats. One is responsible for the refrigerator compartment, the other for the freezer. An error in identifying the faulty element will lead to a waste of time and money.

Diagnostics: checking the thermostat with a multimeter

To accurately determine the malfunction, it is not enough to rely only on external signs. The most reliable way is to ring the thermostat contacts using a multimeter. This procedure requires partial disassembly of the refrigerator, but it is worth it in order not to buy unnecessary parts. Before starting work, be sure to disconnect the appliance from the power supply!

Remove the plastic cover that hides the thermostat (usually it is located inside the refrigerator compartment or outside on top), and get to the sensor housing. Carefully disconnect the wires, first remembering or photographing their location. Now you can start measuring.

The test algorithm is as follows:

1. Set the multimeter in resistance measurement mode (Ohm).
2. At room temperature, the contacts should be closed (resistance is close to zero).
3. Place the sensitive capillary tube in a container with ice or apply a cold object to it.
4. When cooled, the contacts should open, and the device will show infinity (one in the highest discharge).

If during cooling the circuit does not break, or it is open even in a warm state, thermostat it is considered faulty and must be replaced. It is also worth checking the condition of the capillary tube itself: there should be no dents, signs of corrosion or creases.

⚠️ Attention: Never check the integrity of the circuit while the device is connected to the network. This can lead to a short circuit and failure of the multimeter, and is also dangerous to life.

Choosing a suitable thermostat for Atlant

The spare parts market offers many analogues, but for refrigerators Atlant it is critically important to choose a model with the appropriate characteristics. Thermostats differ in the length of the capillary tube, temperature range of operation and method of fastening. Using an unsuitable part will lead to incorrect operation of the unit.

The table below shows popular thermostat models used in various series of Atlant refrigerators:

Contact pay special attention to labeling. The numbers at the end of the name often indicate the shutdown temperature threshold. For example, a freezer requires a sensor that can operate at lower temperatures than the main compartment. Capillary length Also important: if it is too short, you will not be able to properly place the tube in the evaporator, and if it is too long, it will interfere.

Is it possible use a universal thermostat?

Yes, you can if the thread and temperature range match. However, original TAM or K-59 parts often turn out to be more durable and more accurately calibrated for specific Atlant models.

When purchasing a new part, be sure to check the appearance of the terminals and the location of the contacts. Sometimes manufacturers change the design, and installation may require slight adaptation or replacement of the block.

Step-by-step instructions for replacing a thermostat

The replacement process requires care and precision. The main task is not to damage the capillary tube of the new thermostat and to install it correctly in the seat. Incorrect installation will result in the sensor reading the wrong temperature.

First you need to dismantle the old unit. To do this, remove the regulator handle, unscrew the fastening screws and carefully remove the housing from the niche. Release the capillary tube from the holders on the evaporator. Proceed carefully so as not to damage the aluminum fins of the heat exchanger.

Installing the new element is done in the reverse order:

• 🔌 Connect the wires to the new contacts according to the previously made diagram or color marking.
• ❄️ Carefully insert the capillary tube into the hole and secure it in its original place on the evaporator using standard clips.
• 🔧 Place the thermostat housing in place and secure it with screws.
• 🎚️ Put on the adjustment knob and make sure it rotates freely.

After assembly, turn on the refrigerator and monitor its operation. The first cooling cycle may take longer than usual. If the compressor turns off when the normal temperature is reached and turns on again when it rises, it means repair he was successful.

⚠️ Attention: The capillary tube is very thin and fragile. Do not bend it at an acute angle and do not use excessive force during installation, otherwise the seal will be broken and the thermostat will stop working.

Setting and calibrating the temperature

After replacing the thermostat, it may need to be adjusted. Factory settings are not always ideal for specific operating conditions, especially if the refrigerator stores specific products or is in a room with a non-standard temperature.

Inside the thermostat housing there is often a calibration screw, access to which is closed with a seal or plug. Rotating this screw allows you to shift the temperature response range. However, it is not recommended to do this without a special thermometer, since you can reset the settings so much that the refrigerator stops turning off.

For initial settings, use the standard knob:

1. Set the knob to the middle position.
2. Put a household thermometer in the chamber.
3. Wait 5-6 hours for the temperature to stabilize.
4. If the temperature differs from the norm (+4...+6°C for the refrigerator compartment), smoothly turn the knob in the desired direction.

Do not forget that the cooling rate is also affected by the loading density of the chambers and the frequency of door openings. Therefore, it is better to carry out the final calibration during normal operation for a couple of days.

Common mistakes during self-repair

Even experienced craftsmen sometimes make mistakes, let alone beginners. The most common problem is ignoring safety rules or careless handling of electrical contacts. This can lead not only to repeated failure, but also to a fire hazard.

Another common mistake is trying to restore the old thermostat by tapping or heating. In most cases, this gives only a temporary effect, and after a couple of weeks the problem returns. Replacement a new part is the only reliable solution.

Also, users often forget to check the condition of the door seal after repair. If the door does not close tightly, the compressor will work hard, trying to compensate for the heat gain, and the thermostat will constantly drive the motor, which will shorten its service life.

If after replacing the thermostat the refrigerator continues to work incorrectly, perhaps the problem lies deeper. This could be a freon leak, a compressor malfunction, or a blockage in the capillary system. In such cases, it is better to contact a service center for professional diagnostics.

Questions and answers (FAQ)

Is it possible to install a thermostat from another manufacturer, for example, Denmark or Italy?

Yes, it is possible if the mounting dimensions, threads and temperature characteristics match. However, it is better to look for original spare parts Atlant or their direct analogues (TAM, K-59) to avoid problems with compatibility and capillary length.

Why does the refrigerator not turn off after replacing the thermostat?

There may be several reasons: the temperature temperature is incorrectly selected thermostat mode, the capillary tube does not fit well to the evaporator, or the problem is not in the sensor at all, but in a refrigerant leak or a compressor malfunction.

Where is the thermostat in an Atlant two-chamber refrigerator?

In most two-chamber models, the refrigerator compartment thermostat is located inside, in the upper right corner, under a plastic cover. The freezer thermostat (if there is one) can be located outside the top or inside the freezer.

Do you need to defrost the refrigerator before replacing the thermostat?

Complete defrosting is not necessary if you work quickly and carefully. However, if there is a lot of ice in the chamber, it is better to let it melt so that water does not get on the electrical contacts and interfere with access to the evaporator.

How long does a new thermostat last on average?

A high-quality thermostat under normal operating conditions lasts from 5 to 10 years or more. The service life depends on the frequency of on/off cycles and the stability of the mains voltage.