A decrease in cooling efficiency or, conversely, excessive freezing of food often indicates a malfunction of the temperature control system. Owners of household appliances Indesit are the first to notice that the unit has stopped turning off or is working with long interruptions. Thermoregulator is a key element that monitors the temperature in the chamber and gives the command to the compressor to start or stop.
Searching for this node may take different times depending on the design of your model. In some cases, access to it is immediately available, in others, partial disassembly of the case is required. Understanding where is the thermostat of the Indesit refrigeratoris necessary to carry out diagnostics or quickly replace the part without calling a technician.
In this material we will analyze in detail the location of the sensor in various series of equipment, describe the symptoms of the malfunction and provide a step-by-step algorithm of actions. A competent approach will save time and avoid errors when servicing the device.
Operation principle and symptoms of thermostat malfunction
The main task thermostat is to close and open the electrical power circuit of the compressor depending on the readings of the sensitive element. Inside the device there is a bellows tube filled with gas or liquid, which reacts to changes in temperature. When the air in the chamber heats up above a set value, the pressure in the tube increases, the contacts close, and the motor starts.
If this mechanism fails, the refrigerator begins to behave inappropriately. For example, the chamber may not be getting cold, or the food on the top shelf may turn into a block of ice. Often, a breakdown of the thermostat is disguised as a problem with the refrigerant or compressor, so accurate diagnostics is important. Main symptoms indicating the need to check or replace the unit: The refrigerator does not turn on at all, although the light is on and a hum is heard. network. diagnostics.
The main symptoms indicating the need to check or replace the unit:
- 🔌 The refrigerator does not turn on at all, although the light is on and you can hear the buzzing of the network.
- ❄️ The unit operates continuously, without turning off even with the minimum setting of the regulator knob.
- 💧 A “crying” effect is observed in the refrigerator compartment or, conversely, complete dryness and no condensation on the back wall.
- 🌡️ The temperature of the products does not correspond set mode, despite the serviceability of other systems.
⚠️ Attention: If the refrigerator makes loud clicks when trying to start, but the compressor does not start, the problem may be not only in the thermostat, but also in the start relay or the motor itself. Do not rush to change parts without checking with a multimeter.
The location of the thermostat in different Indesit models
The design of refrigerators Indesit has changed over the years, which directly affects the installation location of the control element. In older mechanically controlled models, the thermostat is most often integrated into the temperature control unit, the handle of which is located outside. In modern systems No Frost or electronic control, sensors can be placed separately inside the chamber.
In classic two-chamber models, such as the series C 138 or DF 4180, the thermostat is usually hidden behind a plastic cover that covers the lighting lamp or control panel. You can get to it without moving the unit away from the wall, which simplifies repairs. In this case, the bellows tube goes deep into the fridge compartment, often passing behind the internal plastic panel.
The situation with models No Frost is more complicated. Here the thermostat (or air sensor) can be located:
- 📍 Behind the rear wall of the refrigerator compartment, hidden by a heat-insulating layer.
- 📍 In a niche above the top shelf, closed with a decorative plug.
- 📍 In a separate control unit located in the top parts of the case.
To accurately determine the installation location in your model Indesit it is best to use the technical documentation or service manual, since the company's engineers often changed the layout of the units.
Preparation for dismantling and the necessary tools
Before you start searching and extraction thermostat, it is necessary to ensure the safety of work. Any manipulations with electrical components require completely disconnecting the device from the network. Even if you plan only a visual inspection, the risk of electric shock if you accidentally touch the contacts is high.
You will need a minimum set of tools, which are found in most home craftsmen. It is important to prepare a container to collect water, since condensation may leak out when the tubes are defrosted or disconnected. It would also be a good idea to have a flashlight on hand to illuminate hard-to-reach places inside the camera.
Standard list of tools for replacement:
- 🔧 Flathead and Phillips screwdrivers (sizes PH1, PH2).
- 🔩 Wrenches or sockets (size 7 is often required mm or 10 mm).
- ✂️ Pliers or thin-nose pliers for working with wires and clamps.
- 🧤 Protective gloves to avoid getting hurt by the sharp edges of the metal case.
☑️ Check before starting work
After defrosting the chamber (if required according to the instructions for your model), you can begin to remove the protective panels. Proceed carefully, plastic latches in old refrigerators can be fragile.
Step-by-step instructions for removing the thermostat
The dismantling process begins with removing the temperature control knob. In some models it is simply removed by hand, in others it is fixed with a locking screw that needs to be unscrewed. After removing the handle, access to the internal mechanism opens.
The next stage is dismantling the decorative trim or lampshade. They are usually secured with latches or one or two screws. Be careful: under the lampshade there are often lamp power wires that cannot be damaged. After removing the cover, you will see the thermostat body mounted on a metal plate or plastic bracket.
Next you need to perform the following steps:
- Take a photograph of the location of the wires connected to the thermostat terminals. This is critical for proper reassembly.
- Disconnect the wires, first making sure there is no voltage (although disconnecting from the network is required).
- Unscrew the mounting screws holding the thermostat housing.
- Carefully pull the bellows tube out of the mounting hole. It may fit tightly, so avoid sudden jerks to avoid deforming the capillary.
If the tube passes through a seal or metal partition, you may need to remove an additional inner panel of the refrigerator compartment. In models Indesit with the system No Frost sometimes you have to remove the entire back wall, which greatly complicates the task.
⚠️ Attention: The capillary tube of the thermostat is very thin and sensitive to creases. When removing it, do not bend it at an acute angle, otherwise the device will not work correctly or will fail immediately after installation.
Compatibility and markings table
When purchasing a new part, it is important to know not only the model of the refrigerator, but also the marking of the thermostat itself. Manufacturers of household appliances often use components from different suppliers, such as Tam, K59, K50 or Ranco. Below is a table to help you navigate the main types of thermostats for Indesit.
| Thermostat marking | Refrigerator type | Tube length | Features |
|---|---|---|---|
| TAM 133 | Single-chamber | 0.73 m | With defrost button |
| K 59-L 1102 | Double-chamber | 2.5 m | Standard for most models |
| K 50-L 1950 | Freezer | 1.3 m | For low temperatures |
| TAM 145 | C No Frost | 0.9 m | Shortened tube |
Please note that the length of the bellows tube is a critical parameter. If you install a thermostat with a tube that is too long, it will have to be carefully laid inside the chamber, which can be inconvenient. A tube that is too short simply will not reach the temperature control zone, and the refrigerator will not work properly.
Is it possible to use an analogue?
Using an analogue is possible if the electrical parameters and dimensions match. However, original parts Indesit or direct replacements (eg Danfoss instead of Tams) guarantee better compatibility and durability. Universal thermostats often require adjustment to the length of the tube.
Installing a new regulator and checking operation
Installing a new one thermostat is performed in the reverse order. First of all, carefully insert the bellows tube into the hole until it stops. Make sure that the sensitive element is in its proper place and is not loose. Fix the housing on the bracket with the mounting screws.
Connecting the wires requires maximum care. Use a photo you took earlier so as not to confuse your contacts. An error in the connection can lead to a short circuit or the compressor may not turn on. After connecting the wires, reinstall the decorative trims and the adjustment knob.
After assembly, you need to check the functionality of the system:
- 🔌 Plug in the refrigerator.
- 🎛️ Set the thermostat knob to the middle position.
- 👂 Listen: after a few seconds there should be a click and the compressor will start.
- 🌡️ Let the unit run for 30-40 minutes and check for cold in the chamber.
If the compressor started and began to gain temperature, and after reaching the specified parameters it turned off - the replacement was successful successfully. Otherwise, if the motor hums but does not start, or does not respond at all, the problem may be deeper or the new thermostat is defective.
Frequent errors when installing them yourself repair
Replacing the thermostat yourself is an accessible task, but it requires care. Many users make mistakes that lead to repeated breakdowns. One of the most common is ignoring the condition of the wire insulation. Old wiring may be dry, and during installation it is easy to damage the insulation, which will cause a breakdown on the housing.
Another mistake is incorrect fitting of the tube. If the sensitive element is not in close contact with the cooled surface or the air of the chamber, thermostat it will “lie”. The refrigerator may freeze down to -20 degrees or not turn on at all. They also often forget to check the reliability of fastening of the regulator knob itself, which is why it scrolls without changing the settings.
⚠️ Attention: Technical characteristics and internal structure of refrigerators Indesit may vary slightly depending on the year of manufacture and region of assembly. Before ordering spare parts, check the article numbers on the nameplate of your device or consult official spare parts catalogs.
Is it possible to temporarily bypass the thermostat so that the refrigerator freezes?
Technically, you can close the contacts of the thermostat, and the compressor will work continuously. However, this is strictly not recommended for long-term use. The refrigerator will freeze without stopping, which will lead to freezing of food, breakdown of the compressor due to overheating and huge energy consumption. This is permissible only as a short-term measure to check the operation of the motor.
Why does the new thermostat click, but the refrigerator does not turn on?
The click means that the mechanical part of the thermostat is working and the contacts are closing. If the compressor is silent, the reason may be the start relay, an interturn short circuit in the motor windings, or a lack of voltage in the network. It is also possible that during replacement the contacts on the terminals were poorly cleaned or loosely clamped.
How often do you need to change the thermostat in the 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 (shocks when loading products), it may fail earlier. Scheduled replacement is not required; change only when signs of malfunction appear.
Does the type of refrigerant affect the choice of thermostat?
Yes, it does indirectly. Different refrigerants (R134a, R600a) have different operating pressures and boiling points. Thermostats are calibrated for specific temperature ranges. Using the wrong type can lead to incorrect cycle times.