The refrigerator Atlant stops turning off or, conversely, refuses to start the compressor? In most cases, the reason for this behavior is the failure of the thermostat, which is responsible for maintaining the set temperature. This small device continuously reads the sensor readings and sends a signal to turn the motor on or off when the temperature reaches critical values.
Before calling a technician or buying a new part, it makes sense to do primary diagnostics your own. Often the problem lies precisely in sticking contacts or a violation of calibration, which can be detected without complex equipment. Correctly checking the thermostat of the Atlant refrigerator will save time and money by bringing the equipment back to life in one evening.
To perform the work you will need a minimum set of tools: a screwdriver, pliers and, preferably, a multimeter (tester). If you don’t have a multimeter, you can use the method of visual inspection and “closing” the circuit, but the accuracy of this method will be lower. The main thing is to follow safety precautions and act consistently so as not to damage other components of the unit.
Principle of operation and main symptoms of failure
Thermostat (or thermostat) in refrigerators Atlant is an electromechanical device. Inside its body there is a bellows tube filled with gas or liquid that reacts to changes in temperature. As the tube cools, the gas compresses, the membrane bends and opens the electrical contacts, stopping the compressor. When heated, the process occurs in the reverse order.
Understanding this mechanism helps diagnose the malfunction. If the bellows tube has lost its tightness or the refrigerant has evaporated in it, the membrane stops responding to cold. In this case, the contacts are either constantly open (the refrigerator does not work) or closed (the refrigerator works without stopping, turning the chamber into a freezer).
- ❄️ The compressor hums continuously, not turning off even after reaching low temperatures.
- 🔥 The refrigerator is silent, the indicators are on, but the engine does not start happens.
- 🧊 Ice forms in the refrigerator compartment or, conversely, food begins to deteriorate due to insufficient cold.
It is important to distinguish a thermostat breakdown from problems with the start relay or the compressor itself. If the motor hums but does not start, and after a few seconds you hear a clicking sound, the problem is most likely in the relay or motor windings. If the motor simply does not turn on or off, and the temperature inside the chamber does not correspond to the set temperature - suspect the thermostat.
⚠️ Attention: If you notice that the thermostat tube is swollen or has obvious mechanical damage, further operation of the device is impossible. In such cases, restoration is usually impractical; a complete replacement of the assembly is required.
Sometimes the cause of incorrect operation is not the part itself, but the displacement of the sensitive tube. It must be tightly secured to the evaporator. If the fastening is loose, the sensor reads the temperature of the air, not the surface, which leads to erroneous commands for the compressor.
Removing the thermostat: preparation and access
Before checking the thermostat of the Atlant refrigerator, you must ensure access to it. In most brand models, this element is located inside the refrigerator compartment. First, disconnect the appliance from the power supply - this is a mandatory safety requirement for any electrical work.
Depending on the model Atlant, the thermostat may be located under a plastic cover in the upper corner of the chamber or hidden behind a decorative panel. Carefully remove the temperature control knob by pulling it towards you. Then unscrew the screws securing the cover, or release the latches, if the design provides for their presence.
☑️ Preparation for dismantling
After removing the decorative elements, the thermostat housing will open in front of you. It is usually mounted on a bracket or inserted into a special socket. Carefully remove the device, trying not to sharply pull the capillary tube, as it can be damaged or deformed, which will make the new part inoperable.
Disconnect the wires from the contacts. Before doing this Take a photo of the connection diagram or sketch out the location of the wires so as not to confuse the terminals during assembly. In some models, the wires can be fixed with plastic clamps - they need to be carefully cut or unfastened.
Methods of checking with a multimeter (continuity)
The most reliable way to check the thermostat of an Atlant refrigerator is to use a multimeter in resistance measurement mode (Ohm) or continuity. This method allows you to accurately determine the integrity of internal contacts and their ability to open under the influence of temperature.
Set the multimeter switch to the “continuity” position (usually indicated by a speaker symbol) or to the minimum resistance measurement limit. Touch the probes to the input and output contacts of the thermostat. In normal condition (at room temperature), the circuit should be closed, and the device will emit a beep or show a resistance close to zero.
Next you need to check the thermostat's response to cold. To do this, lower the sensitive tube (or the entire device, if the design allows) into a container of cold water and ice for several minutes. After cooling, the contacts should blur, and the multimeter should show infinite resistance (open circuit).
| Thermostat status | Readings at room temperature | Readings after cooling | Diagnosis |
|---|---|---|---|
| Good | 0 Ohm (Sound) | ∞ (No sound) | Works correctly |
| Faulty (break) | ∞ (No sound) | ∞ (No sound) | Contacts do not close |
| Faulty (stuck) | 0 Ohm (Sound) | 0 Ohm (Sound) | Contacts do not open |
| Unstable contact | Values jump | Values jump | Replacement required |
If after removal from the cold the contacts do not close on their own, lightly tap the thermostat body. Sometimes this helps the moving parts of the mechanism return to their original position. If even after this the circuit is not restored, the part is considered defective.
Diagnostics without a multimeter: short circuit method
What to do if there are no measuring instruments at hand? There is a popular method that allows you to roughly assess the performance of a node. It is based on direct closure of the circuit, bypassing the thermostat. This method is suitable for an initial check when the refrigerator does not turn on at all.
First, make sure that the problem is the compressor not starting. Disconnect the wires from the thermostat and connect them directly to each other (using an insulated conductor or twist). Be extremely careful: The operation is carried out only when the refrigerator is disconnected from the network, the power supply is connected after connecting the wires.
If, after turning on the network, the compressor starts and gets cold, This means that the entire power circuit is working properly, and the thermostat most likely does not close the contacts. If the motor is silent even with a direct connection, the problem lies deeper: in the starting relay, motor windings or wiring.
This method does not provide a 100% guarantee, since it does not check for open circuits during cooling. It only confirms that the motor is working properly and is ready to work if voltage is applied to it. For a complete diagnosis, it is still recommended to acquire a simple tester.
⚠️ Attention: When using the direct circuit method, the compressor will work continuously until you turn off the refrigerator manually. Do not leave the equipment in this mode for a long time to prevent deep freezing of food and overheating of the engine.
Compatibility table and marking of thermostats
When purchasing a new part, it is important to know that thermostats are for refrigerators Atlant may have different markings and capillary tube lengths. The most common models are marked TAM (made in Slovakia) or domestic analogues of the K series. Incorrect selection can lead to incorrect operation of the temperature regime.
Pay attention to the number of contacts. In simple single-chamber models there are usually two of them, in double-chamber models there are three (the third contact is often responsible for a light bulb or indication). The length of the bellows tube is also important: if it is too short, you will not be able to attach the sensor correctly; if it is too long, you will have to carefully roll up the excess without bending it.
Deciphering the TAM marking
The letters TAM mean the type of thermostat. The numbers after the letters (for example, TAM-133) indicate the temperature range of operation. For example, TAM-133 operates at lower temperatures than TAM-145.
Below is a table of popular models of thermostats used in various equipment:
| Marking | Refrigerator type | Length tubes | Features |
|---|---|---|---|
| TAM-118 | Single-chamber | 0.73 m | The most common |
| TAM-133 | Two-chamber | 1.3 m | For freezer |
| TAM-145 | Double chamber | 2.5 m | For large chambers |
| K-50 | Single chamber | 0.75 m | Analogue TAM-118 |
When replacing, try to choose an analogue with the most similar characteristics. If the exact model is not commercially available, you can install a universal thermostat, but setting it up will require additional calibration and time.
Replacing and setting up a new regulator
The process of installing a new part is the reverse of the dismantling process. Insert the sensing tube into the mounting hole until it stops, but without excessive force. Secure the thermostat housing in its original place and connect the wires according to the diagram or photograph made earlier.
Pay special attention to securing the end of the tube. It should fit snugly against the evaporator. To improve heat transfer, sometimes it makes sense to use a special heat-conducting paste or simply make sure that there are no gaps or insulation between the tube and the surface of the evaporator.
After assembly, turn on the refrigerator and set the regulator to the middle position. Let the equipment run for several hours to stabilize the temperature. If the compressor starts to turn off when it gets cold and turns on when it warms up - replacement was successful.
If the refrigerator continues to work incorrectly, you may need to adjust the screws on the thermostat itself (they are often filled with paint, which means the factory setting). You should twist them very carefully, making no more than a quarter of a turn at a time, and monitoring the result.
⚠️ Attention: Technical characteristics and location of components in different modifications of refrigerators Atlant may vary. Before starting work, check the technical documentation specifically for your model, since the design may vary depending on the year of manufacture.
Frequently asked questions (FAQ)
Is it possible to repair an old thermostat, or is it necessary replacement only?
In 95% of cases, repairing the thermostat is impractical. Inside there is a sealed capsule with gas, and damage to its integrity or loss of properties requires replacement of the entire assembly. Attempts to disassemble and lubricate the contacts often lead to final failure.
Why doesn’t the new thermostat turn off the refrigerator?
Perhaps the sensitive tube is not immersed deep enough in the evaporator or is in poor contact with it. The cause may also be incorrect settings or defective parts. Check the tightness of the tube.
How to understand that the problem is in the thermostat and not in the relay?
If, when the wires are directly connected (bypassing the thermostat), the compressor starts and works, then the power circuit and the relay are working. If the motor is silent even with a direct connection, the problem is in the relay, motor or wiring.
How much does it cost to replace a thermostat yourself?
The cost consists only of the price of the part itself (usually from 500 to 1500 rubles depending on the model). As a rule, the home craftsman already has the tools, so the costs are minimal compared to calling a specialist.