The situation when the refrigerator Atlant stops turning off or, conversely, stops gaining cold, often confuses the owner. In most cases, the root of the problem lies in the failure of the device responsible for controlling the temperature inside the chambers. This small but critical element controls the operation of the compressor, closing and opening the electrical circuit depending on the readings of the sensor. thermostat - a device responsible for controlling the temperature inside the chambers. This small but critical element controls the operation of the compressor, closing and opening the electrical circuit depending on the sensor readings.
If you notice that a “coat” of ice has formed on the walls of the chamber, and the motor is humming without stopping, or the products have begun to quickly deteriorate due to insufficient cooling, this cannot be ignored. Replacing a thermostat yourself is a very real task for a person who knows how to hold a screwdriver, but it requires precision and understanding of the device. Installation errors can lead to compressor breakdown or even a fire.
In this article we will analyze in detail the process of diagnosing and replacing the thermostat in refrigerators Atlant various series. You will learn how to distinguish a sensor malfunction from problems with freon or a start relay, what tools you will need and what to pay special attention to when installing a new part.
Principle of operation and signs of a thermostat malfunction
The thermostat, or thermostat, is an electromechanical device. Inside the sealed flask is a temperature-sensitive gas or liquid that changes its pressure when thermal conditions change. This pressure acts on a membrane, which mechanically closes or opens the contacts, supplying power to the compressor. Models Atlant most often use capillary thermostats, where a long capillary tube is lowered into the evaporator.
You can understand that thermostat has failed by a number of characteristic signs. However, it is important not to confuse them with symptoms of other breakdowns. For example, if the compressor runs constantly but does not gain any cold, the problem may be a freon leak and not the sensor. But if the motor works cyclically, but the cycles are too long or short, or the refrigerator does not respond at all to turning the control knob, it falls on the thermostat.
Main symptoms of failure:
- ❄️ The refrigerator does not turn off for days, forming an ice crust on the back wall.
- 🔌 The compressor does not start at all, although the light is on and the relay click is heard.
- 🌡️ The temperature in the chamber does not correspond to the set position of the handle (too cold or warm).
- 🔨 The thermostat clicks have become too loud or frequent.
It is worth noting that in two-chamber models Atlant with the No Frost system, the thermostat can control the temperature in the freezer compartment, and in chambers with a “crying” wall - in the refrigerator compartment. The location of the problem depends on the design of the specific model.
⚠️ Attention: If the refrigerator makes strange sounds or you smell a burning smell, immediately unplug the appliance. Continuing to operate faulty equipment is dangerous to life.
Diagnostics should begin with a visual inspection and check of the electrical circuit. Often the contacts inside the thermostat burn out, which leads to loss of conductivity. In some cases, cleaning the contacts helps, but most often a complete replacement of the unit is required. How does your refrigerator behave? turns off unit replacement.
Necessary tools and preparation for repair
Before you start disassembling the refrigerator Atlant, you need to prepare a workplace and tools. Repairing electrical appliances requires compliance with safety precautions. First of all, make sure that you have clear access to the rear wall of the unit and the internal chambers. Disconnect the refrigerator from the power supply - this is the first and most important rule.
To carry out the work, you will need a standard home craftsman's kit, supplemented with some specific tools. Do not use rusty or damaged tools, as this can lead to slipping and injury or damage to the plastic case.
List of required equipment:
- 🔧 Set of screwdrivers (phillips and flathead of different sizes).
- 🔌 Multimeter (tester) for checking integrity chains.
- 🔪 A knife or flat spatula for carefully removing plastic plugs.
- 🧤 Gloves to protect hands from sharp edges and possible oil.
- 📸 Smartphone for photographing the wiring diagram.
Pay special attention to the multimeter. Without it, the diagnosis will be “blind”. You will need to ring the thermostat contacts in different positions of the control knob. If you do not have experience working with electrical measuring instruments, it is better to ask for help from a familiar electrician or craftsman.
☑️ Preparation for repair
It is also important to prepare the equipment itself. If there is a lot of ice in the freezer, it needs to be defrosted. An attempt to pry off frozen ice with a knife can lead to breakdown of the evaporator, which will turn a simple thermostat repair into an expensive circuit replacement.
Removing the old thermostat
The process of removing the thermostat in refrigerators Atlant may differ depending on the model. In most cases, the thermostat is located inside the refrigerator compartment, under a light bulb, or on an external control panel. Let's consider the most common option - the internal location.
First remove the temperature control knob. It is usually simply removed by hand, but if it is tight, you can carefully pry it off with a flat-head screwdriver wrapped in a cloth so as not to scratch the plastic. Under the handle you will see a mounting screw or latches. After unscrewing the screw, carefully remove the thermostat housing from the niche.
Next you need to gain access to the electrical contacts. Remove the protective cover, if present. Before disconnecting the wires, be sure to photograph their location or draw a diagram. Wire colors may vary between batches, and connection “at random” is not acceptable.
Disconnect the terminals. They can be removed with finger force or require slight loosening. If the terminals are oxidized, they can be cleaned, but it is better not to take risks. Now you need to remove the sensitive tube - the capillary. It passes through a hole in the chamber wall and is secured with a special clamp or simply inserted into a groove.
Carefully pull out the capillary tube. Do not use excessive force or bend the tube sharply, as it is hollow inside and filled with refrigerant. Damage to the tube will make the new thermostat unusable.
Nuances of removing the capillary
In some Atlant models, the capillary tube can be glued to the evaporator with hot-melt adhesive. In this case, it cannot be torn off by force - you need to carefully heat the attachment point with a hair dryer (not a construction hair dryer, but a regular hair dryer) or soak it with warm water so as not to damage the thin-walled evaporator.
After removing the tube, the thermostat is completely free. Compare it with a new spare part: the length of the capillary, the location of the contacts and the rod must match. Markings on the body of the old device will help you choose an exact analogue.
Installation of a new temperature sensor
Installation of a new one thermostat is done in the reverse order, but observing important nuances. Make sure you purchase a part with similar specifications. For refrigerators Atlant thermostats of the TAM or K-50, K-59 series are often used. They may differ in the length of the capillary tube and the on/off temperature.
First, carefully insert the capillary tube into the chamber hole. Move it forward until it is in the same position as the old one. The length of the protruding part of the tube must correspond to the original. If the tube is too long, you can carefully roll it into a ring (with a radius of at least 5 cm) and place it inside the body, but do not bend it.
Fix the thermostat in the seat. Make sure it fits snugly and doesn't wobble. The vibration of a running compressor should not be transmitted to the sensor housing, otherwise it may cause false alarms. Connect the wires according to the diagram or photograph made earlier.
Check the reliability of the contacts. The terminals should fit tightly and not fall off with a slight tug. If the contacts spark, the thermostat will quickly burn out. After connecting the electrical part, reinstall the decorative trim and the regulator knob.
⚠️ Attention: Make sure that the capillary tube does not touch the moving parts of the fan (in No Frost models) and is not pressed by sharp metal edges, which can lead to chafing.
Now you can proceed to checking the functionality systems. Plug in the refrigerator. For the first minutes, the compressor can work in enhanced mode, gaining temperature. Listen to the clicks of the thermostat - they should be clear.
Checking performance and setting
After replacing the thermostat, you need to make sure that the refrigerator is in the correct operating mode. Do not load the camera with food right away - let the device run idle for at least 2-3 hours. This will allow you to evaluate the actual cooling efficiency and compressor cycling.
Use an external thermometer placed in a glass of water to monitor the temperature in the chamber. The standard temperature for the refrigerator compartment is +2...+5°C. If the readings are very different, you may need to adjust or replace the part with a model with different parameters.
Table of common thermostats for Atlant:
| Thermostat model | Refrigerator type | Length capillary | Features |
|---|---|---|---|
| TAM-133 | Single-chamber | 0.73 m | Short rod, 3 contacts |
| TAM-145 | Two-chamber | 1.3 m | Long rod, for freezer |
| K-59 L1950 | No Frost | 2.5 m | For systems with defrost |
| T-120 | Universal | 0.9 m | Often requires modification of the housing |
Pay attention to the duration of operation and rest of the compressor. In normal mode, the refrigerator Atlant should work for about 10-15 minutes and rest for 20-30 minutes (at normal load and room temperature). If the cycle is too short (2 minutes work, 2 minutes rest), this is a “clocking” that is harmful to the motor.
If the refrigerator is working correctly, you can fix the control knob in the desired position. Sometimes there is a locking screw under the handle for this purpose.
Common mistakes during self-repair
Repairing household appliances with your own hands is always a risk. Even following the instructions, amateur craftsmen often make mistakes that nullify all efforts or lead to new breakdowns. Knowing these “rake” will help you avoid them.
One of the most common mistakes is the wrong choice of analogue. Thermostats look similar, but have different turn-on temperatures. Installing an unsuitable part will result in the refrigerator either not turning off (freezing all food) or not turning on (food will spoil).
Another error is damage to the capillary tube during installation. This is a thin element, and a crease or crack will lead to leakage of filler gas. The thermostat will stop responding to temperature. It is also dangerous to leave bare wires or poor insulation, which can lead to a short circuit.
- 🚫 Ignoring grounding: when installing a new part, make sure that the grounding contact (if it was) is connected.
- 🚫 Strong tension on the wires: the wires must lie freely, without tension, so that when vibrating do not pull out the terminals.
- 🚫 Using inappropriate lubricant: do not lubricate the tube with oil or grease to facilitate insertion - this may damage the plastic or rubber seals.
⚠️ Attention: Technical characteristics of refrigerators may vary depending on the year of manufacture and modification. Always check the markings of the old part with the new one before purchasing.
If you are not confident in your abilities, it is better not to take risks. Refrigerator repair is not only the replacement of a part, but also an understanding of the physical processes occurring inside the system.
Is it possible to repair an old thermostat, or is it only necessary to replace it?
Q In 95% of cases, the thermostat only needs to be replaced. There is a sealed gas system inside, and it is impossible to restore it at home. If the contacts are burnt, cleaning them will only give a temporary effect, since the cause of the burn is sparking due to wear of the mechanism or power surges.
Why does the new thermostat click, but the refrigerator does not turn on?
This may indicate a malfunction of the compressor start relay or the motor itself. The thermostat gives a proper signal (click), but the actuator does not respond. It is also worth checking the presence of voltage at the input to the thermostat.
How can you understand that the problem is not in the thermostat, but in a freon leak?
If the thermostat is working (checked by the tester), but the refrigerator does not freeze and the compressor runs constantly (or does not start due to protection), most likely the tightness of the circuit is broken. A sign is the lack of heating of the condenser grille at the back or the presence of an oily spot at the leak site.
Where to buy an original thermostat for Atlant?
It is better to purchase original spare parts from authorized service centers of the brand Atlant or from large suppliers of components for household appliances. There are many cheap Chinese analogues on the market, the resource of which is unpredictable.
Is it necessary to defrost the refrigerator before replacing the thermostat?
Yes, complete defrosting is required. First of all, it's safe. Secondly, in a defrosted state it is easier to remove the capillary tube, since it has not frozen to the walls of the evaporator. The minimum defrosting time is 12-24 hours.