An unexpected breakdown of household appliances often takes you by surprise, especially when it comes to the safety of food. If your refrigerator stops turning off or, conversely, stops getting cold, most likely the thermostat has failed. This small device is responsible for maintaining a set temperature inside the chambers, sending a signal to the compressor to turn on or off.
Replacing the thermostat yourself is a very real task for a person with minimal technical skills and a basic set of tools. You don't have to call a professional if you are willing to act carefully and follow safety precautions. The main thing is to correctly diagnose the problem and select a compatible part for your model Indesit, Atlant or any other.
In this article we will analyze in detail the entire process: from troubleshooting to final testing of the repaired device. You will learn where to look for the sensor, how to dismantle it and what to pay attention to when installing a new element.
Diagnostics of a thermostat malfunction
Before disassembling the equipment, you need to make sure that the problem lies there. thermostat. Symptoms may be similar to a compressor failure or freon leak, so care is important. The main sign of a malfunction of the temperature controller is a violation of the cyclic operation of the compressor.
If the motor-compressor operates continuously, without turning off, even when the products in the chamber are clearly frozen, this is a sure sign of sticking contacts inside the sensor. In this case, thermostat does not open the electrical circuit, and the equipment wears out. The opposite situation is also possible: the refrigerator is silent, the food is melting, and the compressor does not even try to start.
⚠️ Attention: Before any diagnostics, be sure to disconnect the refrigerator from the power supply! Working with live electrical components is deadly.
There is a simple test method that is often used by craftsmen. If you have a two-compartment refrigerator, find a small plastic box inside the refrigerator compartment where the sensor bellows tube goes. Carefully remove the thermostat and short-circuit the two wires coming from it (usually pins 3 and 4), eliminating the regulator itself from the circuit. If, after connecting to the network, the compressor starts working, then the culprit has been found.
Preparing tools and selecting spare parts
For a successful replacement, you will need a standard home craftsman's kit. You should not try to carry out repairs “by eye” or using unsuitable tools, as this can lead to damage to the plastic elements of the case or the insulation of the wires.
You will need:
- 🔧 Screwdrivers (Phillips and flat) for removing panels and terminals.
- 🔪 A stationery knife or side cutters for stripping wires (if required).
- 🧤 Gloves to protect hands from sharp edges and dirt.
- 📸 Smartphone for photographing the connection diagram before disassembling.
The most important thing is to choose the right new one thermostat. They come in different types: with one or two contact groups, with or without a quick freeze button, with different lengths of the capillary tube. Markings are usually applied to the body (for example, TAM-133, K-59, RANCO). It is best to remove the old device and look for an analogue by its code.
Pay attention to the length of the capillary tube. If the new tube is too long, you can carefully roll it into a ring, but under no circumstances bend or shorten it. Damage to the tube will lead to the release of freon from the system and the complete unsuitability of the part.
☑️ What to prepare for repair
Access to the thermostat in different models
The location of the thermostat depends on the design of the refrigerator. In most modern models it is located inside the refrigerator compartment, but there are exceptions. Understanding where to look for the sensor will save you a lot of time.
In classic models, such as Biryusa or old ZIL, the regulator is often located outside, on the top panel of the case. In more modern two-chamber models (LG, Samsung, Indesit), it is usually hidden inside, in the lampshade or under the top cover of the chamber.
| Refrigerator brand | Location thermostat | Access features |
|---|---|---|
| Atlant, Biryusa | Inside, to the left of the ceiling | You need to remove the plastic lamp casing |
| Indesit, Ariston | Inside, under the top cover | Requires dismantling of the plastic panel |
| Stinol, Nord | Outside, above the door | Access through the upper grille of the case |
| Liebherr, Bosch | Inside, in the ceiling light | Complex latching system lamp |
If you cannot find the thermostat visually, refer to the technical documentation for your model. The location of the main nodes is always indicated there. Sometimes, to gain access, you have to remove the entire top cover of the refrigerator, which requires caution when working with latches.
The process of dismantling the old thermostat
After you have reached the unit, the most crucial stage begins. What is important here is not so much strength as accuracy. Plastic that has been in the cold for years becomes brittle and breaks easily.
First you need to remove the regulator handle. It can simply pull towards itself or be held on by a screw hidden under a decorative plug. After removing the handle, unscrew the mounting screws and remove the protective cover. Before disconnecting the wires, be sure to take a photo or sketch the connection diagram. The colors of the wires may not correspond to the standards, and it is easy to confuse them.
Next you need to disconnect the terminals. Usually they are simply removed by hand or with pliers if they are tight. Do not pull on the wires themselves, but grab the metal tip of the terminal. After disconnecting the electrical part, it is necessary to remove the sensitive element - the capillary tube.
⚠️ Attention: The capillary tube is very thin and fragile. When removing it, do not use excessive force so as not to damage the evaporator or the tube of the new sensor itself.
The tube can be secured in a special hole or pressed with a bracket. Gently release it. If the thermostat is built into the ceiling light, you may need to remove the entire light assembly. In some models, the tube is simply inserted into the channel, in others it is fixed to the evaporator.
Installation of a new thermostat and assembly
Installation of a new one thermostat is performed in the reverse order. Insert the capillary tube into the same hole where you removed the old one. The immersion depth must be the same as that of the previous sensor, otherwise the temperature regime will be disrupted.
Fix the device body in its original place. Connect the wires according to the diagram or photograph you made earlier. Make sure that the terminals are pushed all the way in and are not loose. Poor contact will lead to sparking and eventual burnout of the contacts.
Install the regulator handle and secure the casing. If you have a model with a quick freeze button, check that the button mechanism moves freely and is not stuck in the body. Collect all removed plastic panels and decorative elements.
Checking operation and setting the temperature
After assembly, turn on the refrigerator. In the first minutes of operation, it may make more noise than usual - this is normal, the process of starting and distributing the refrigerant is in progress. Pay attention to whether the compressor turns off after reaching the set temperature.
For an initial check, place a thermometer in the chamber. Set the control to the middle position (usually number 3 or 4). Check the readings after a few hours. If the temperature is normal (about +4...+5°C), then the replacement was successful.
If the refrigerator is not working correctly, adjustment may be required. Some thermostats have adjustment screws, but it is best not to turn them without special equipment. It's easier to experiment with the position of the handle, finding the optimal mode.
Is it possible to replace the thermostat with a universal one?
Yes, there are universal thermostats that fit many models. However, it is important to choose an analogue with similar temperature characteristics and capillary tube length. Universal models often require adjustment to the location.
Why does the new thermostat click but does not turn on the compressor?
This may indicate a malfunction of the new device itself, poor contact in the terminals, or a problem with the compressor start relay. Check the voltage at the thermostat contacts when turned on.
Do you need to defrost the refrigerator before replacing?
Full defrosting is not necessary if access to the thermostat is in the upper part of the chamber. However, if access to the rear wall or evaporator is required, defrosting is necessary for safety and convenience.
How much does it cost to replace a thermostat in a service?
The cost consists of the price of the spare part and the work of the technician. On average, the service costs 1,500–3,000 rubles, depending on the region and the complexity of access to the node.