The brand's refrigeration equipment Indesit is deservedly popular due to its reliability and affordable cost. However, like any complex mechanism, the unit can fail over time, and the most common cause of temperature violations is a faulty regulator. If you notice that the food in the chamber has begun to freeze or, conversely, spoil due to insufficient cold, most likely the problem lies in the thermostat or electronic sensor. Replacing this part on your own is a real task for a home craftsman who has basic skills in working with tools and a basic understanding of electrical circuits.
Before taking active steps, you must clearly understand that thermostat (temperature regulator) is a device that opens the electrical circuit when the set temperature is reached, thereby stopping the operation of the compressor. In models with a system No Frost or electronic control, the function of a mechanical regulator is performed by sensors, but the principle of their influence on the motor operating cycle remains similar. Ignoring a breakdown can lead to accelerated wear of the compressor or complete spoilage of products, so prompt diagnosis and replacement of the element are critical to maintaining the functionality of the equipment.
In this article we will analyze in detail the process of diagnostics, selection of components and direct replacement of the regulator in refrigerators Indesit. You will learn how to safely dismantle the old element, what to pay attention to when installing a new one, and how to check the performance of the system after repair.
Diagnostics of a malfunction of the temperature controller
Before disassembling the equipment and buying spare parts, you need to make sure that the problem is in the regulator, and not in a freon leak or a compressor malfunction. There are several characteristic signs that indicate thermostat failure. If the refrigerator Indesit works non-stop, freezing a huge “cap” of ice in the freezer, or, conversely, the compressor does not start at all, but it is warm inside, these are direct symptoms of a problem with the control circuit.
For an initial check, you can use the visual inspection and listening method. When you turn the control knob, you should hear a quiet click - this is the contacts opening or closing. If there is no click, and the knob turns too easily or, on the contrary, is jammed, the mechanical part of the thermostat is damaged. In electronic models Indesit a malfunction is often accompanied by an error code on the display, which can be deciphered by referring to the instructions.
The most accurate diagnostic method is contact testing a multimeter. To do this, you need to get to the thermostat terminals, remove the wires from them and measure the resistance. In working condition at room temperature, the contacts should ring (resistance is close to zero). If the multi-MR displays one or infinity, the circuit is broken and the regulator requires replacement.
⚠️ Attention: Before making any measurements with a multimeter, make sure that the refrigerator is completely de-energized. Applying voltage to the tester probes in resistance measurement mode will instantly disable the device.
The necessary tools and preparation of the workplace
The success of the repair directly depends on the preparation. You don't need specialized industrial equipment, but your tool kit should be complete and in good working order. The main difficulty in replacing the regulator in refrigerators Indesit often lies not in the part itself, but in access to it, which may be limited by the design features of a particular model.
You will need the following set of tools:
- 🔧 Set screwdrivers - Phillips and flat of different sizes, since the screws can be different;
- 🔧 Pliers —for careful removal of terminals and clamps;
- 🔧 Multimeter —for checking circuit integrity and diagnostics;
- 🔧 Knife or a special tool for removing seals (if required access to hidden screws);
- 🔧 Flashlight - to illuminate the interior of the refrigerator compartment.
It is also recommended to prepare a container for defrosting, if during the dismantling process you need to defrost the evaporator, and dry rags. The work area should be well lit, and the space around the refrigerator should be free so that you can move freely and open the doors wide. Do not forget to order a suitable thermostat model in advance, having found out the exact article number or parameters of your old device.
☑️ Preparation for repair
Removing the old thermostat in Indesit refrigerators
The process of removing the temperature controller in refrigerators Indesit varies depending on the location of the thermostat. In classic models, it is often located inside the refrigerator compartment, in a plastic case, or hidden behind the top decorative strip (popularly “forehead”). In some cases, the thermostat is placed outside, on the ceiling of the chamber, which greatly simplifies access.
If the regulator is located inside:
- Remove the plastic caps from the temperature control knob and carefully pull the knob towards you.
- Unscrew the screws securing the thermostat housing to the chamber wall.
- Carefully remove the housing, trying not to damage capillary tubewhich goes into the evaporator.
- Take a photo of the diagram for connecting the wires to the terminals so as not to confuse them during installation.
- Remove the wires from the contacts and disconnect the ground (yellow-green wire).
Take special care when working with the capillary tube. It is a thin copper conductor filled with gas or liquid that responds to changes in temperature. If you pinch, break or damage its integrity, the thermostat will stop working correctly, even if the electrical part is working properly. In models Indesit with a system No Frost instead of a mechanical thermostat, sensors mounted on plastic clips or inserted into special sockets on the evaporator can be used.
⚠️ Attention: The capillary tube of the thermostat is very sensitive to mechanical damage. Do not bend it at an acute angle or pull it with force, otherwise the refrigerant inside will evaporate and the new regulator will have to be thrown away.
Installation and connection of the new regulator
Installation of the new element is carried out in the reverse order of dismantling. The key point here is the correct fit of the thermostat sensing part. In mechanical models, the end of the capillary tube must be pressed tightly against the wall of the evaporator or inserted into a special socket, which is often lubricated with thermal conductive paste to improve heat transfer. In refrigerators Indesit the tube is often fixed in a channel inside the chamber wall.
When connecting the electrical part, strictly follow the photograph or diagram taken earlier. Usually the terminals are numbered, but the colors of the wires may differ depending on the year of manufacture of the model. Contact should fit tightly, without play. If the terminals are oxidized or loose, you can gently pry them up with pliers, but be careful not to split the plastic terminal housing.
After connecting the wires, reinstall the thermostat housing and secure it with screws. Make sure that the capillary tube is not pinched anywhere and does not come into contact with moving parts (for models with fans). Do not install the regulator knob yet - you will need it for the final adjustment.
What to do if the new thermostat does not fit the length of the capillary?
If the capillary tube of the new regulator is longer than that of the old one, it can be carefully twisted into a ring with a radius of at least 4-5 cm and secured next to the mounting point. Shortening the tube is strictly prohibited - this will disrupt the calibration and pressure inside the system, the thermostat will not work correctly.
Compatibility table and marking of thermostats
When purchasing a new part, it is important to pay attention not only to the brand, but also to the technical characteristics. Thermostats for refrigerators Indesit may differ in the on/off temperature, the length of the capillary tube and the mounting method. Below is a table with common markings that are often found in this technique.
| Marking (Series) | Type of contacts | Capillary length | Application |
|---|---|---|---|
| TAM-133 | Normally closed | 0.75 m | Single-chamber refrigerators |
| K-59 | Normally closed | 1.5 - 2.5 m | Two-chamber Indesit models |
| TAM-145 | Normally closed | 1.0 m | Freezers and cabinets |
| K-50 | Normally closed | 0.6 - 0.8 m | Small refrigerators |
Please note that using a thermostat with an unsuitable temperature range may result in incorrect operation. For example, if you install a freezer control in the refrigerator compartment, food may freeze. Conversely, the thermostat for the refrigerator compartment in the freezer will constantly keep the compressor on, trying to achieve unattainable cold.
Checking operation and setting the temperature mode
After assembling all the components and installing the regulator knob, you can proceed to testing. Plug in the refrigerator. In the first minutes of operation, you should hear a characteristic click of the compressor starting. If the motor starts working, this is a good sign - the electrical circuit is assembled correctly. Let the equipment run for about 30-40 minutes for the cold to form.
Now you need to check the compressor shutdown. Set the control knob to the middle position. After some time, when the temperature in the chamber reaches the set value, a shutdown click should be heard and the motor will stop. If the refrigerator Indesit does not turn off for a long time (more than an hour with an empty chamber), the thermostat may be set to too low a temperature or the sensitivity of the element is impaired.
If the compressor does not start at all after replacement, re-check the connection diagram. Often the error lies in mixed up wires or poor terminal contact. It is also worth checking whether the regulator knob is stuck in the “Off” position (usually this is the extreme left position).
Typical mistakes when replacing yourself
Even experienced craftsmen sometimes make mistakes, not to mention beginners. One of the most common problems is incorrect installation of the capillary tube. Its end should have maximum contact with the surface whose temperature it is intended to control. If the tube dangles in the air or is pressed against a plastic wall instead of a metal evaporator, the thermostat will “lie.”
Another common mistake is ignoring the condition of the door seals after repair. During dismantling, the door is often kept open for a long time, which can lead to deformation of the sealing rubber or its displacement. This will cause warm air to enter, and the refrigerator will wear out, creating the illusion of a malfunction of the just replaced regulator.
Also, users often forget about the stabilization time. After replacing the thermostat and loading the refrigerator for the first time with food, Indesit it takes up to 24 hours to reach the nominal operating mode. Do not panic and turn the regulator knob in the first hours if the temperature seems not low enough to you.
Is it possible to replace a mechanical thermostat with an electronic sensor?
Theoretically, this is possible, but it requires a deep rework of the control system. The mechanical thermostat simply opens the 220V circuit, and the electronic sensor transmits the signal to the control module. Without replacing the “brains” of the refrigerator, such a replacement will not work.
Why does the new thermostat click, but the refrigerator does not freeze?
The click means that the electrical circuit is closing and opening. If the compressor does not start, the problem may be in the start relay, the compressor itself, or a freon leak, and not in the thermostat.
How often do you need to change the thermostat in an Indesit refrigerator?
The average service life of a high-quality thermostat is 7-10 years. However, with frequent power surges in the network or mechanical damage during defrosting, it may fail earlier.
Is the liquid inside the capillary tube dangerous?
Most household thermostats use an inert gas or a safe liquid (freon in small quantities). When the tube is depressurized, it simply evaporates, not posing a threat to health, but the device itself stops functioning.
Where can I find the connection diagram for my model?
The electrical connection diagram is usually pasted on the back wall of the refrigerator or is in the technical data sheet. You can also find an electrical diagram for the refrigerator model on the Internet by entering the full index of the device.