Refrigerators of the brand Atlant are deservedly popular due to their reliability and maintainability, but over time, even the highest quality equipment breaks down. One of the most common problems faced by owners of these units is a violation of the temperature regime caused by a broken thermostat. If your refrigerator stops turning off, works without interruptions, or, conversely, does not get cold, in most cases the culprit is the thermostat.
Independent replacement of this element is possible if you have basic skills in handling tools and follow safety precautions. This process does not require complex specialized equipment, but does require attention to detail, as incorrect installation can result in compressor failure or food spoilage. In this article, we will look in detail at how to diagnose a malfunction, choose the correct sensor model and correctly replace it in refrigerators Atlant.
Before starting disassembly, you need to make sure that the problem lies in the thermostat, and not in a freon leak or a malfunction of the start relay. Often the symptoms may be similar, but the treatment methods are radically different. Competent diagnostics will save you time and money, allowing you to avoid purchasing unnecessary spare parts.
Diagnostics of a thermostat malfunction
The first sign of failure thermostat is incorrect operation of the compressor. In normal mode, the refrigerator turns on and off cyclically, maintaining the set temperature. If the motor hums continuously and the food in the freezer is covered with a thick crust of ice, this is a sure signal that the temperature sensor is “stuck” in the “on” position.
There is a simple method of initial testing that does not require disassembling the housing. Turn the temperature control knob to the minimum cooling position (usually number 1 or “Min”). If the compressor does not turn off for a long time, the probability of the thermostat failure is extremely high. However, to finally confirm the diagnosis, you will need to test the contacts with a multimeter.
⚠️ Attention: Before carrying out any diagnostic and disassembly work, be sure to disconnect the refrigerator from the power supply. Working with live electrical components is deadly.
For more accurate diagnostics, you can use the “freezing” method. Remove the thermostat, place it in a container with cold water (temperature about 0-2 degrees) and ring the contacts. If the device is working properly, when cooling the contacts should close (or open, depending on the type), producing a characteristic click.
Selection of an analogue and preparation of tools
Refrigerators Atlant are equipped with thermostats from various manufacturers, most often there are models from firms Tam, K-59, T-110 or Ortiz. When purchasing a new spare part, it is critical to pay attention not only to the markings, but also to the length of the capillary tube. If the tube is too short, you will not be able to lay it out correctly, and if it is too long, it will interfere with assembly.
The number of contacts and the direction of rotation of the shaft are also important. Some models have a third contact to indicate compressor operation, which may not be used in older models. When purchasing a new thermostat ask the seller to provide a connection diagram or take a photo of the markings of the old device.
To carry out the work you will need a minimum set of tools:
- 🔧 Screwdrivers (phillips and flat) for removal panels.
- 🔑 Ratchet wrench or 10 mm socket for dismantling fasteners.
- 🔌 Multimeter for checking circuit integrity.
- ✂️ Wire cutters or side cutters for working with insulation (if necessary).
Prepare your work area in advance: it should be well lit, and it is better to put all small parts in a separate container so as not to lose the screws during disassembly.
Is it possible to use a universal thermostat?
Universal thermostats often require modification of the case or adapters. It is better to use original spare parts or complete analogues designed specifically for the Atlant series of refrigerators to avoid problems with tightness and seating.
Removing the old thermostat
The process of removing the thermostat in refrigerators Atlant usually begins with dismantling the top panel or lampshade, depending on the model. In most two-chamber models, the thermostat is located inside the refrigerator compartment, behind a plastic cover.
First you need to remove the temperature control knob. It may be a tight fit, so be careful not to break the plastic. Under the handle you will see mounting screws or latches that secure the thermostat housing. By unscrewing them, you will gain access to the electrical contacts and the capillary tube.
Disconnecting the wires requires special care. Before disconnecting, it is recommended to take a photo of the connection diagram or mark the wires with a marker so that when installing a new element you do not confuse phase and neutral. The capillary tube must be removed from the evaporator very carefully, avoiding sudden jerks and kinks.
☑️ Preparation for dismantling
If the capillary tube is stuck to the evaporator or stuck in the insulation, do not use excessive force. Gently loosen it or use a lubricant (such as WD-40) to make it slide easier. Damage to the tube will lead to a refrigerant leak, which will require an expensive refill from a technician.
Connection diagram and installation of a new sensor
Installation of a new one thermostat is done in the reverse order of dismantling. Pay special attention to the correct connection of electrical wires. In the standard refrigerator circuit Atlant three main contacts are used: phase input, output to the compressor and, possibly, output to the indicator lamp.
Here is an approximate table of contact correspondence for common models of thermostats:
| Contact on the thermostat | Function | Wire color (approximate) | Where to connect |
|---|---|---|---|
| 3 | Network input | Brown/Red | From power plug |
| 4 | Output to compressor | Black/Blue | To start relay |
| 6 | Indication/Ground | Yellow/Green | To lamp or housing |
| 3 | Phase (L) | Brown | Power |
| 4 | Compressor | Black | Relay |
| 6 | Ground/Lamp | Yellow | Grounding |
The capillary tube of the new sensor must be carefully inserted into the evaporator hole to the same depth to which the old one was immersed. The length of immersion affects the accuracy of temperature measurement. If the tube hangs in the air of the chamber, the refrigerator will not work correctly.
Fix the thermostat housing in its original place, making sure that the wires are not pinched and do not touch moving parts or hot surfaces of the compressor (although there are none in the chamber, it is important not to damage the insulation on sharp metal edges).
Setting up and testing operation
After assembling the case and connecting the refrigerator to the network, do not rush to load products. Let the unit run idle for 2-3 hours. The initial setting of the thermostat knob is usually made at the middle value (number 3 or 4).
During the first cycle of operation, pay attention to the following parameters:
- ❄️ Compressor operating time before the first shutdown.
- 🔇 The nature of the click when turning off (must be clear).
- 🌡️ Temperature in chamber after the cycle (check with a thermometer).
If the refrigerator turns off too quickly, before it has time to gain cold, the capillary tube may not be immersed deep enough in the evaporator. If it freezes too much and does not turn off, check whether the tube is pinched or whether the thermostat type is selected correctly.
⚠️ Attention: Technical characteristics of thermostats may vary slightly depending on the year of manufacture of the refrigerator. Always check the parameters of the new part with the markings on the nameplate of your device.
It is considered normal if the refrigerator gains temperature and turns off within 30-60 minutes of operation, and then “rests” for about the same time. The imbalance of these cycles indicates the need for re-adjustment or checking the tightness of the system.
Common mistakes during self-repair
One of the most common mistakes is ignoring condition of door seals. If you replace the thermostat, and the refrigerator still works intermittently, the problem may be that warm air gets into the chamber, and the new sensor simply does not have time to cool the volume.
Also, technicians often forget to check start relay the compressor. If the relay is “tired”, it may malfunction, which is mistakenly diagnosed as a breakdown of the thermostat. Always check the entire chain: socket - wire - thermostat - relay - compressor.
Incorrect wiring is another common problem for beginners. By mixing up the contacts, you can apply voltage to the wrong motor winding or create a short circuit. Use a multimeter to test the circuit before final assembly.
Sometimes users try to repair an old thermostat by disassembling its housing. It is strictly not recommended to do this, since the calibration of the springs and the tightness of the bellows are disrupted. Such “repairs” are temporary and often lead to repeated breakdowns after a few days.
Why is the new thermostat humming?
Some electronic or combination thermostats may produce a quiet hum or crackling sound when switching. If the sound is not accompanied by sparking or a burning smell, this is the norm for certain models.
Questions and answers (FAQ)
Is it possible to install a thermostat from another refrigerator model on the Atlant?
Theoretically, it is possible if the mounting dimensions, capillary tube length and temperature range match triggering. However, it is better to use original spare parts or proven analogues listed in compatibility catalogues.