The situation when your Indesit refrigerator stops correctly maintaining the temperature regime often causes panic. Food begins to deteriorate, ice appears on the walls or, conversely, everything freezes. In most cases, the culprit of such failures is a failed thermal sensorwhich stops transmitting the correct signals to the control board.
Understanding where exactly this small but critical element is located will allow you to carry out a primary diagnostics or even replace the part yourself. Temperature sensor in the technology of this brand it is usually hidden from the user’s eyes, since it is located inside the working chamber or in the ventilation system.
In this article we will analyze in detail the design of refrigerators Indesitso that you can accurately determine the location of the sensor in your model. This knowledge will save time when calling a specialist or help with self-repair.
It is worth noting that in different series of refrigerators the arrangement of elements may differ slightly. However, the general principle of the manufacturer's layout remains similar over the years.
The principle of operation of the thermostat and its role in the system
Before looking for the physical location of the part, you need to understand how it functions. Thermistor (or thermistor) is a semiconductor element whose resistance varies depending on the ambient temperature. In refrigerators Indesit it acts as the main “eye” of the electronic control module.
When you set the cooling mode, the control board reads the readings from the sensor. If the temperature is higher than the set one, the module starts the compressor. As soon as sensor records the achievement of the desired degree, it sends a signal to turn off the motor. Without this element, the refrigerator would work endlessly or would not turn on at all.
⚠️ Attention: Incorrect sensor readings can lead to the compressor running idle, which significantly reduces the service life of the unit and increases energy consumption.
In modern models with the system No Frost there can be several sensors: one controls the temperature in the chamber, the other in the evaporator zone to control defrost. The accuracy of their operation directly affects the absence of ice and the safety of products.
Typical location of the sensor in the fridge compartment
In classic two-chamber refrigerators Indesit with a drip defrosting system, the main temperature sensor is most often located inside the fridge compartment. It is not noticeable, as manufacturers try to make it invisible.
Usually the element is built into the plastic shade where the lighting lamp is located, or is mounted on the back wall of the camera. On some models it may be hidden behind a decorative panel at the top of the refrigerator compartment. To get to it, partial disassembly of the internal space is often required.
Here are the main places to look for thermal sensor:
- 🔹 In a plastic box along with a light bulb on the ceiling of the camera.
- 🔹 On the back wall, hidden behind removable plastic cover.
- 🔹 In the corner of the chamber, next to the hole for the release of cold air (in models with ventilation).
- 🔹 Under the shelf, in a special recess in the wall of the case.
If your refrigerator is equipped with an electronic display door, the sensor is almost certainly located inside, closer to the air circulation area. In older models with mechanical control, the control function could be performed thermostat with a capillary tube, which was built into the wall.
Searching for a sensor in the freezer and the No Frost system
The situation with the freezer is more complicated, especially when it comes to the system No Frost. Here the evaporator temperature sensor plays a key role in the automatic defrost cycle. It is located behind the back wall of the freezer, directly on the evaporator fins.
To access this element in refrigerators Indesit, you will have to remove the back panel of the freezer compartment. This requires unplugging the unit and possibly completely defrosting it if there is a lot of ice on the evaporator. The sensor is usually fixed in a special hole or pressed against the refrigerant pipes.
☑️ Preparing to disassemble the freezer
It is important to distinguish between the air temperature sensor in the chamber and the evaporator defrost sensor. The first one can be in plain sight, and the second one can be hidden deep in the structure. An error during replacement will cause the system No Frost to stop defrosting correctly, and the chamber will become overgrown with a "fur coat".
⚠️ Attention: When removing the back panel in the freezer, be extremely careful with the plastic latches. They become fragile in the cold and easily break if handled carelessly.
Fault symptoms and diagnostic methods
How to understand that the problem is in the temperature sensor, and not in the compressor or freon leak? There are a number of characteristic signs indicating failure of this element. Diagnostics begins with monitoring the behavior of the equipment.
If the refrigerator Indesit works continuously without turning off, and the temperature inside the chamber does not drop below +10...+15 degrees, this is a sure sign. Also, a breakdown is indicated by cyclic switching on and off at very short intervals.
Main symptoms of a malfunction:
- ❄️ An ice crust forms on the back wall of the refrigerator compartment.
- ❄️ Food in the refrigerator compartment freezes, although the mode does not changed.
- ❄️ An error appears on the display (for example, a flashing temperature indicator).
- ❄️ The compressor hums constantly or does not start at all.
How to check the sensor with a multimeter?
To check, you will need a multimeter in measurement mode resistance. The sensor is removed and its resistance is measured at room temperature (usually about 5-10 kOhm). Then you can cool it (for example, put it in the freezer for 5 minutes) and measure it again - the resistance should change. If there is no change or the resistance is infinite, the sensor is faulty.
Professional diagnostics often include checking the resistance of thermistor using an ohmmeter. The resistance values must correspond to the temperature-resistance characteristic (TLC) declared by the manufacturer for a specific model.
Indesit table of common errors
Modern refrigerators Indesit are equipped with a self-diagnosis system. If the sensor malfunctions, error codes may appear on the display or certain indicators may flash. Knowing these codes helps to localize the problem.
| Code/Symptom | Description of the problem | Probable cause | Actions |
|---|---|---|---|
| Flashing "F" | Fault in the freezer | Open sensor circuit | Checking contacts and replacing the sensor |
| Code F03 | Defrost sensor error | Evaporator sensor malfunction | Replacing the defrost sensor |
| Alarm is on | Temperature increase | Thermostat malfunction | Diagnostics of the cooling system |
| Indicator flashing | Unstable operation | Oxidation of contacts | Cleaning connectors and wiring |
Please note that error codes may vary depending on the year of manufacture and series of the refrigerator. In some models, instead of alphanumeric codes, a combination of flashing LEDs is used.
Instructions for replacing the temperature sensor
If the diagnostics confirmed a malfunction, thermal sensor it must be replaced. This is a procedure that requires accuracy, but is quite accessible to a person with basic equipment repair skills. The main thing is to follow the sequence of actions.
First you need to turn off the power to the refrigerator Indesit. Then remove all shelves and drawers from the chamber where the sensor is located. Get to the sensor installation location, carefully disconnect the wires and remove the old element.
Install the new sensor in the same place, making sure that it fits tightly to the surface (if it is an evaporator sensor) or is correctly positioned in the air flow. Connect the wires, reassemble the structure in reverse order and turn on the refrigerator.
⚠️ Attention: Do not use sensors with a different resistance rating. This will lead to incorrect operation of the refrigerator and possible spoilage of food.
After turning on, let the refrigerator operate for several hours without loading food. This will allow the system to enter operating mode and stabilize the temperature.
Is it possible to temporarily operate a refrigerator without a sensor?
Theoretically, some craftsmen practice installing a blende or fixing contacts, but this is highly not recommended. The refrigerator will operate in emergency mode, which can lead to defrosting of food or failure of the compressor due to overheating.
How much does the original sensor for Indesit cost?
The price of the original temperature sensor varies from 500 to 1500 rubles depending on the model and region. Analogues may cost less, but their reliability and accuracy of readings often raise questions among specialists.
Do sensors in Indesit refrigerators often break down?
Yes, this is one of the common faults, especially in models older than 5-7 years. Voltage changes and natural wear and tear of materials lead to changes in the characteristics of the thermistor.