A malfunction of the refrigerator cooling system Indesit often becomes an unpleasant surprise, especially when the required temperature is no longer maintained in the chamber. In such cases, owners of household appliances often wonder where the temperature sensor is located, since it is this element that is responsible for controlling the cold. Understanding the design of the unit helps to quickly diagnose a problem, be it a compressor failure or sensor failure.
In refrigerators of this brand, the temperature control system can be implemented differently, depending on the model and year of manufacture. In some cases it is a mechanical thermostat, in others it is an electronic sensor that transmits signals to the control board. Exact location The element is critical for diagnostics and subsequent repairs.
You should not ignore the first signs of a malfunction, such as frequent turning on of the motor or a complete lack of cooling. Knowing how yours works Indesitwill allow you to make an informed decision: call a technician or try to fix the problem yourself, having the necessary skills and tools.
Principle of operation and types of temperature sensors
Before looking for the installation location of the element, you need to understand exactly how it functions inside the system. In classic models of refrigerators Indesit with a drip defrosting system, a mechanical thermostat is most often used. This device is a sealed capsule with gas or liquid that responds to temperature changes by opening or closing electrical contacts.
In more modern models, especially in units with a system No Frost, electronic temperature sensors (thermistors) are used. Their work is based on changes in resistance depending on the degree of heating or cooling. The signal from such an element goes directly to the electronic control module, which makes the decision to start or stop the compressor.
Differences in design directly affect where exactly the required part will be located. Mechanical thermostats typically have a long capillary tube that must be positioned correctly in the evaporator. Electronic sensors are compact devices, often hidden in plastic cases or behind panels.
⚠️ Attention: An attempt to replace an electronic sensor with a mechanical analogue (or vice versa) without altering the control circuit will lead to irreversible damage to the electronics of the refrigerator.
Understanding the type of device you have is the first step to a successful repair. If you are not sure which system is installed in your refrigerator, it is best to refer to the technical documentation or find the model on the manufacturer’s official website.
Where to look for a temperature sensor in various Indesit models
Finding a faulty element requires a clear understanding of the design of a specific refrigerator model. In most cases, manufacturers try to hide technical components behind decorative panels so as not to disturb the aesthetic appearance of the product. However, there are standard places where the likelihood of detecting the sensor is highest.
In refrigerators with a top freezer, the thermostat is often hidden inside the refrigerator compartment itself. It can be found under the top cover, behind the lampshade or in a special plastic box. In this case, the capillary tube goes deep into the wall or is attached to the evaporator.
If we are talking about a system No Frostthe sensors can be located at several points: on the evaporator of the freezer, in the cold air supply channel or in the melt water drainage area. Access to them is usually blocked by the back wall of the freezer, which must be dismantled.
To accurately determine the installation location, it is useful to know the model markings. It is usually located on a sticker inside the chamber or on the back wall of the unit. Knowing the model, you can find the corresponding diagram in the service manuals.
Here are the main areas where temperature sensors are most often hidden:
- 📍 Behind the rear panel of the freezer (in No Frost models).
- 📍 In the niche above the ceiling of the refrigerator compartment (for mechanical thermostats).
- 📍 Near the compressor on the rear outer wall (rare, but found in older models).
- 📍 In the condensate drainage system (defrost sensor).
Instructions for accessing the sensor and dismantling
Process Gaining access to the temperature sensor requires caution and compliance with safety precautions. The first and most important step is to completely disconnect the refrigerator from the power supply. Working with electrical appliances under voltage is strictly prohibited, as this can lead to electric shock or short circuit.
Next, you need to empty the refrigerator compartment of food and remove all shelves and drawers that may interfere with access to the back wall or ceiling. If the sensor is in the freezer, it may be necessary to pre-defrost for 10-12 hours so that the ice does not interfere with the removal of the panels.
To remove the plastic panels, use a plastic spatula or spatula so as not to damage the latches. Metal tools may scratch or break fragile plastic. After removing the panel, you will see the evaporator and the wires suitable for it.
The sensor itself is usually fixed to the evaporator using a special clamp or inserted into a hole and filled with sealant. When removing the old element, act carefully so as not to damage adjacent tubes or wires.
⚠️ Attention: When dismantling the rear panel in No Frost models, be careful with the fragile evaporator tubes - their damage will lead to freon leakage and costly repairs.
If you find that the sensor is filled with foam or sealant, you will have to carefully release, possibly with partial removal of the insulating material. The new installation location must also be sealed so that moisture does not get on the contacts.
Diagnostics and checking the serviceability of the element
Before installing a new part, you need to make sure that the problem lies there. A visual inspection may show obvious damage, such as a broken wire or oxidized contacts, but often the defect is hidden inside the housing.
To check a mechanical thermostat, you can use a multimeter in continuity mode. At room temperature the contacts should be closed (unless the thermostat is manually turned off). When cooled (for example, if you put it in the freezer for 15 minutes), the circuit should open.
Electronic temperature sensors are tested by measuring their resistance. Normal readings depend on the temperature and type of sensor, but usually at room temperature (+20...+25°C) the resistance is about 5-10 kOhm. When cooling, the resistance should change.
Below is a table with approximate resistance values for common types of sensors at different temperatures:
| Sensor type | Temperature (°C) | Resistance (kOhm) | Status |
|---|---|---|---|
| Electronic (NTC) | +25 | 5.0 - 6.0 | Normal |
| Electronic (NTC) | 0 | 15.0 - 17.0 | Normal |
| Electronic (NTC) | -18 | 60.0 - 70.0 | Normal |
| Any type | Any | Infinity | Break |
If the multimeter readings are very different from the table or the device shows a break/short short circuit at any temperature, the part must be replaced. It is also worth checking the integrity of the wires going to the sensor.
Replacement process and installation of a new sensor
Installation of a new temperature sensor is carried out in the reverse order of dismantling. If you are replacing a mechanical thermostat, it is extremely important to secure the sensing capillary tube correctly. It must fit tightly to the evaporator in the same place where the old one was fixed, otherwise the refrigerator will not work correctly.
To fix the tube, use standard clamps or special aluminum plates. It is not allowed to secure the tube with tape or tape, as they do not provide proper thermal contact and may melt. In some cases, the mounting location is additionally lubricated with heat-conducting paste.
When connecting an electronic sensor, make sure that the connectors match. If the connectors are different, you will have to solder the wires. In this case, be sure to use heat shrink to insulate the joints to prevent moisture penetration and short circuits.
After installing all the elements, reassemble the structure in reverse order. Make sure that all panel latches are in place and that the wires are not pinched. Only after complete assembly can you plug in the refrigerator.
Typical mistakes during repairs and their consequences
One of the most common mistakes is ignoring tightness during installation. Moisture that gets onto the contacts of the temperature sensor or inside the connector causes corrosion and false readings, which can lead to a permanent freeze or, conversely, to defrosting of food.
Another common mistake is incorrect installation of the capillary tube of a mechanical thermostat. If it touches the walls of the chamber or other elements that are not the evaporator, the thermostat will respond to the air temperature, and not to the temperature of the evaporator, which will disrupt the operation cycle.
It is also not recommended to use sensors from other models of refrigerators without checking their parameters. Even if they are physically suitable in size, their temperature characteristics may differ, which will lead to incorrect operation of the entire system.
⚠️ Attention: The characteristics of temperature sensors may vary depending on the specific series of Indesit refrigerators. Always check the markings of the new part with the original before installation.
Be careful when working with plastic elements: frozen plastic becomes very fragile. Sudden movements can lead to breakage of the panel fastenings, which will require their replacement or repair.
Frequently asked questions (FAQ)
Is it possible to temporarily operate a refrigerator without a temperature sensor?
Theoretically, you can close the contacts of a mechanical thermostat so that the compressor works constantly. However, this will result in deep freezing of food, ice formation, and ultimately, compressor failure due to overload. Operation without a working sensor is only possible for a short time for defrosting or diagnostics.
Why does the refrigerator not turn on after replacing the sensor?
There may be several reasons: the wires are connected incorrectly, the new sensor is faulty, or the problem lies not in the sensor, but in the start relay or the compressor itself. It is also worth checking whether voltage is supplied to the control board after assembly.
Where to buy an original temperature sensor for Indesit?
Original spare parts are best purchased from authorized service centers or specialized spare parts stores for household appliances. When purchasing, pay attention to the markings and compatibility with your refrigerator model.
How often should you change the temperature sensor?
The service life of the temperature sensor is not strictly limited by regulations. It changes only when it fails. Under normal operating conditions and the absence of power surges in the network, the sensor can serve for decades.