The situation when Atlant refrigerator stops turning off or, conversely, starts to start too often, often indicates a failure of the thermostat. This small but critical element controls the compressor operating cycles, maintaining a given temperature in the chambers. If you notice that the food in the freezer is freezing, and ice forms on the walls of the main compartment, or the appliances have stopped cooling altogether, the problem with a 90% probability lies in the thermostat.
Do not panic and immediately call a technician, because replacing a thermostat in Atlant brand refrigerators is a procedure that can be done with your own hands if you have basic skills and a minimum set of tools. In this article we will analyze in detail how to carry out diagnostics, select the correct spare part and perform a replacement, based on technical documentation and practical experience in repairing household appliances.
Particular attention should be paid to safety, since the work will be carried out with an electrical appliance that is energized. Before starting any manipulations, you must completely turn off the power to the unit by unplugging the power cord from the outlet. Ignoring this rule can lead to serious consequences, including electric shock or damage to the control electronics.
Diagnosing a thermostat malfunction
Before you start disassembling and purchasing new parts, you need to make sure that the problem is really in the thermostat. Symptoms may be similar to a freon leak or a bad start relay, so accuracy is important. The main sign of a breakdown thermostat is the incorrect behavior of the compressor: it either works without stopping, ignoring shutdown commands, or is silent, even when it is clearly warm in the chamber.
There is a simple method of initial testing that does not require complex equipment. If the refrigerator does not turn on, you can try to close the contacts of the thermostat directly. To do this, you will need to remove the casing and carefully connect the wires going to the regulator, bypassing the mechanism itself. If after this procedure the compressor starts working, then the circuit is working properly, and the culprit of the silence has been found.
⚠️ Attention: Direct closure of the contacts should be carried out only for a short time to check the motor starts. Long-term operation of the refrigerator bypassing the thermostat will lead to defrosting of food or, conversely, to deep freezing and breakdown of the compressor due to overheating.
Visual inspection can also give clues. If the thermostat capillary tube shows signs of mechanical damage, dents or corrosion, the element definitely requires replacement. It is also worth checking the contacts for the presence of oxides or traces of burning, which often happens during power surges in the network.
Selection of suitable spare parts for Atlant
The spare parts market for household appliances offers many analogues, but for a long and stable service it is better to choose original components or proven substitutes. Thermostats for refrigerators Atlant may differ in the length of the capillary tube, the diameter of the rod and the location of the contacts. An incorrectly selected part may not fit into its normal place or read the temperature incorrectly.
The most common thermostats used in Atlant models are TAM series thermostats or their modern analogs of the K-59, K-50 brands. It is important to pay attention to the markings on the body of the old device. The numbers and letters in the code indicate the temperature range of operation and the length of the capillary. For example, for single-chamber models and two-chamber models with one cooling chamber, the parameters will be different.
When choosing a new part, pay attention to the following characteristics:
- 🔹 Length of the capillary tube: must match the original or be a little larger (the excess can be carefully rolled up).
- 🔹 Type of contacts: quantity and location the terminals must match for easy connection.
- 🔹 Temperature mode: on and off parameters must meet the requirements of your refrigerator model.
If you are not sure of the choice, it is better to remove the old thermostat and go to the store with it or take a photo of the marking. This will eliminate mistakes and the need to go back for spare parts. Remember that there are no universal solutions, and each model range may have its own characteristics.
Is it possible to use a thermostat with a longer tube?
Yes, you can. If the new capillary tube is longer than the original one, its excess must be carefully rolled into a ring inside the refrigerator body, avoiding creases and kinks. The main thing is not to shorten the tube, as this will break the tightness of the system and damage the part.
Necessary tools and preparation
To successfully replace the thermostat in the Atlant refrigerator, you do not need a professional set of tools. A basic kit is enough, which any home craftsman can find. Preparing the workplace and having all the tools at hand will significantly speed up the process and make it more comfortable.
You will need:
- 🔧 Screwdrivers: flat and Phillips (usually sizes PH1, PH2 and 3-5 mm slot) for removing panels and fastening elements.
- 🔧 Pliers or pliers: for carefully removing terminals and working with wires.
- 🔧 Knife or scalpel: may be required for stripping contacts or removing old insulation if necessary.
- 🔧 Flashlight: for illuminating the interior of the refrigerator chambers and thermostat niches.
Before starting work, the refrigerator must be completely defrosted and dried. Moisture inside the cameras can get on the electrical contacts, which is unacceptable. It is also recommended to move the unit away from the wall, providing free access to the rear part, if the design of your model requires the capillary tube to be exited through the rear wall.
☑️ Ready for repair
Removing the old thermostat
The process of removing the faulty part begins with dismantling the plastic interior elements that hide the mechanism. In Atlant refrigerators, the thermostat is usually located inside the refrigerator compartment, under the lampshade or in a separate box on the top panel. In some models, access is through the upper end of the door or the side wall.
First you need to remove the temperature control knob. It is simply pulled onto the rod and removed by hand. Then the screws securing the protective casing or lamp shade are unscrewed. Be careful with plastic latches - they can be fragile, especially if the plastic is “tired” from time and low temperatures.
After removing the protective panel, access to the thermostat itself will open. Here it is important to remember or photograph the wiring diagram. Take a photo of the location of the wires before disconnecting them - this will become your main cheat sheet when installing a new element. Carefully remove the terminals from the contacts, slightly rocking them from side to side. Do not pull on the wires themselves, so as not to damage the insulation.
The capillary tube of the thermostat is attached to the evaporator or in a special channel. It must be carefully released. If the tube is secured with a clip or screw, unscrew the fastener. The tube should be pulled out smoothly, without jerking, so as not to damage the internal channel in the refrigerator wall. In some Atlant models, the end of the tube can be taped with electrical tape or secured with sealant to the wall of the evaporator - in this case, you will need to carefully cut off the fasteners.
Installing a new thermostat
Installation of a new part is carried out in the reverse order of dismantling. First of all, the capillary tube of the new thermostat is inserted into the channel or to the evaporator. It must fit tightly to the surface of the evaporator in the mounting area, since the accuracy of temperature reading depends on this. If there is a thickening (sensing element) at the end of the tube, it should be in the same place where it was located at the old sensor.
Secure the tube with standard fasteners. If your new thermostat comes with additional fasteners or gaskets, be sure to use them. Reliable fastening of the capillary is the key to proper operation of the entire refrigerator. After fixing the tube, you can move on to the electrical part.
Connect the wires to the contacts of the new thermostat, focusing on the photographs or diagram taken earlier. Usually the wires are color coded, but you shouldn't rely on color alone, as previous craftsmen may have made changes. Make sure the terminals are tight and not loose. Poor contact will lead to sparking and heating, which is dangerous.
Install the thermostat housing in its original place and secure it with screws. Make sure that the rod protrudes evenly so that the adjustment knob seats without distortion. Put the handle on and check that it rotates easily. Then reinstall the protective casing, lamp shade and other removed interior elements.
Comparison of thermostat models for Atlant
The variety of modifications of Atlant refrigerators requires the use of different types of thermostats. Understanding the differences will help you avoid mistakes when ordering parts. Below is a table comparing popular models of thermostats used in this technique.
| Thermostat model | Refrigerator type | Capillary length | Features |
|---|---|---|---|
| TAM-133 | Single-chamber | 0.73 m | Short capillary, 3 contacts |
| K-59 L1188 | Double-chamber | 2.5 m | Analog of TAM-133, long tube |
| TAM-145 | No Frost | 3.0 m | For systems with automatic defrosting |
| K-50 L1950 | Freezers | 2.0 m | Designed for low temperatures |
As can be seen from the table, the main difference is the length of the capillary tube and the temperature range. Using a thermostat from the freezer in the refrigerator compartment will cause food to spoil because the sensor will not turn off the compressor at the desired temperature. Conversely, installing a “thermal” sensor in the freezer will cause the motor to constantly work.
It is also worth considering the number of contacts. Some Atlant models use three-contact thermostats, where the third contact is responsible for the operation indicator lamp or the No Frost system. If you change a three-pin sensor to a two-pin one (or vice versa), you will need to redo the electrical circuit, which is not recommended to do without specialized knowledge.
Checking operation after replacement
After completing assembly and connecting the refrigerator to the network, do not rush to load the products. The unit needs time to reach operating mode and stabilize the temperature. The first check can be carried out visually and auditorily. The compressor should start some time after switching on.
Turn the thermostat knob. You should hear a characteristic click at the moment when the mechanism should turn the compressor off or on. If there is no click, but the compressor hums constantly or is silent, the installation may have been carried out incorrectly or the new part itself may be defective. In this case, the check must be repeated, making sure that the contacts are reliable.
⚠️ Attention: Complete stabilization of the temperature in the chambers after replacing the thermostat may take from 2 to 5 hours. Do not open the doors frequently during this period and do not load the refrigerator with warm food to allow the equipment to return to operating mode correctly.
Use a thermometer to check the actual temperature inside the chambers after several hours of operation. It must correspond to the set position of the regulator knob. For the refrigerator compartment the norm is +2...+5°C, for the freezer - -18°C and below. If the indicators deviate significantly, re-adjust or replace the part.
Common mistakes during self-repair
Despite the apparent simplicity of the operation, Beginners often make mistakes that nullify all efforts or lead to new breakdowns. One of the most common is damage to the capillary tube during installation. The thin copper tube is easily pinched or broken, making the thermostat unusable.
Another common mistake is ignoring grounding or incorrectly connecting the wires. In Atlant refrigerators, the thermostat housing is often connected to ground (grounding). If the wires are mixed up, you can shorten the control system or trigger the protection. Always double-check the connection diagram.
Also, many people forget about the tightness of the channel through which the capillary tube passes. If there is a hole left in the wall of the refrigerator, warm, moist air will penetrate through it into the insulation. This will lead to the formation of condensation inside the housing, swelling of the walls and corrosion. The entry point of the tube should be carefully foamed or sealed with sealant.
What to do if the new thermostat clicks, but the refrigerator does not freeze?
If there are clicks, then the mechanics are working, but the problem may be different. Check if the compressor starts when it clicks. If the engine hums but does not start, the problem is in the start relay or the compressor itself. If the motor is silent, check for voltage at the thermostat contacts. The wiring may be faulty or the contacts in the circuit have oxidized.
Is it possible to repair an old thermostat?
Theoretically, some types of faults (for example, oxidation of contacts) can be eliminated by cleaning. However, a thermostat is a sealed system filled with gas or liquid. A leak in the seal or a change in the properties of the sensitive element makes repair impossible. It is cheaper and more reliable to buy a new part.
How often do you need to change the thermostat in the Atlant refrigerator?
The average service life of a high-quality thermostat is 7-10 years. However, with frequent power surges in the network or extreme operating conditions (constant setting to maximum), the resource can be reduced to 3-5 years. Scheduled replacement is not required, only after a breakdown.
Why does the refrigerator turn off too early?
If the compressor operates in short cycles and does not have time to reach the desired temperature, the thermostat sensitive element may be incorrectly attached to the evaporator or has moved. Also, the reason may be in the sensor itself, if it is set to a higher shutdown temperature than required.
Where can I find a wiring diagram for my model?
The electrical diagram is often pasted on the inside wall of the refrigerator, on the back panel or in the operating instructions. If the paper version is lost, the diagram can be found on the Internet by the exact name of the model (for example, Atlant MHM 1700), indicating it in a search engine along with the word “electrical diagram.”