Two-chamber refrigerators Indesit are one of the most popular models on the Russian market due to the combination of price and functionality. However, even with reliable technology, failures can occur over time, and most often they are associated with incorrect operation temperature sensor. If your refrigerator no longer supports the set mode, freezes too much or, conversely, does not cool food, the problem may lie in this element.
Finding a temperature sensor in a two-chamber Indesit is not as simple as it seems: its location depends on the model, year of manufacture and even modification of the compressor. In this article, we will look at where exactly to look for the sensor in the refrigerator and freezer compartments, how to identify it visually, and also give practical advice on diagnostics without calling a technician. You will learn what tools you will need to check, how to distinguish a faulty sensor from problems with the thermostat or control board, and what to do if the sensor is in an inconvenient place (for example, behind the back wall).
We will pay special attention to models Indesit with a system No Frost and drip defrosting - their principles of sensor location are radically are different. We will also consider typical errors when searching (for example, confusing a temperature sensor with defrost sensor or thermal relay) and explain why in some cases it is easier to replace the sensor than to repair.
1. How the temperature control system works in Indesit refrigerators
Before looking for a sensor, it is important to understand how the temperature control system generally works in two-chamber models Indesit. Unlike old refrigerators with a mechanical thermostat, modern devices are equipped electronic sensorsthat transmit data to the main control module.
Main components of the system:
- 🔹 fridge compartment temperature sensor —responsible for maintaining the specified mode (usually +2…+8°C).
- 🔹 Freezer temperature sensor — controls the level of freezing (from −12°C to −24°C).
- 🔹 Defrost (defrost) sensor — prevents icing of the evaporator (available only in models c No Frost).
- 🔹 Thermostat or electronic control unit - processes signals from sensors and controls the compressor.
In most two-chamber Indesit is used two separate temperature sensors - one for each camera. However, in budget models (for example, Indesit BIA 18 or Indesit DF 4180) only one sensor can be installed, which controls only the refrigerator compartment, and the freezer is regulated by indirect indicators.
The system operates on the feedback principle: if the temperature in the chamber rises above normal, the sensor sends a signal to the board, which turns on the compressor. As soon as the temperature reaches the set value, the compressor turns off. If the sensor fails, the control module either does not receive data or receives incorrect data - this leads to constant operation of the compressor or, conversely, its complete shutdown.
2. Where is the sensor located? temperature in the fridge compartment
In the fridge compartment of two-chamber Indesit the temperature sensor is usually located in one of three places. Its location depends on the type of defrosting system and the design of the model.
2.1 Models with drip defrosting (manual)
In refrigerators with drip system (for example, Indesit BIAA 13, Indesit ST 167), the temperature sensor is most often located:
- 📍 On the back wall of the chamber, next to the evaporator (plastic panel with tubes). The sensor can be hidden under a plastic casing or attached to the evaporator with tape.
- 📍 At the top of the camera, cerca of the ceiling, under a plastic cover (sometimes together with a lighting lamp).
- 📍 On the side wall, closer to the front (rare, but found in older models).
Visually, the sensor is a small plastic cylinder with wires the length of 3–5 cm. It is often wrapped in a heat-shrinkable tube or secured to a metal bracket. The color of the wires may vary, but usually it is black and white (or red).
2.2. Models with No Frost
In refrigerators with a system No Frost (for example, Indesit ITF 118, Indesit ITS 200) the temperature sensor of the refrigerator compartment is located differently:
- 📍 In the duct, through which cold air flows from the freezer compartment. The sensor can be built into the plastic housing of the duct or attached to it.
- 📍 On the ceiling of the chamber, under the decorative panel (sometimes together with a fan).
- 📍 Behind the back wall, but not on the evaporator, but in a special compartment for air circulation.
In models with No Frost the sensor is often confused with defrost sensor, which is responsible for defrosting the evaporator. The latter is usually located directly on the evaporator of the freezer and has a different appearance (usually flat, with two contacts).
How to distinguish a temperature sensor from a defrost sensor?
The temperature sensor usually has a round or cylindrical shape and is connected to the main control board. The defrost sensor is flat, with two terminals, and is connected to the defrost module or timer. Also, the defrost sensor is always located on the evaporator of the freezer, and the temperature sensor is in the refrigerator or on the air duct.
| Type. systems | Indesit model range | Typical location of the fridge compartment temperature sensor |
|---|---|---|
| Drip defrosting | BIAA 13, ST 167, BIA 18, DF 4180 | Rear wall (next to the evaporator) or the top of the chamber |
| No Frost (Full No Frost) | ITF 118, ITS 200, INTS 16 | Air duct or chamber ceiling (under the panel) |
| No Frost (only in the freezer) | C 132 NF, TIA 16 | Rear wall of the refrigerator compartment (below the shelf) |
| Inverter models | IAA 10, IAA 12 | Built-in into the control board or on the air duct (depending on the modification) |
If your model is not listed in the table, focus on the type of defrosting system. In 90% of cases, the fridge compartment temperature sensor is located either on the back wall or in the air duct.
3. Where to look for the temperature sensor in the freezer
In the freezer of two-chamber Indesit the temperature sensor is located more predictably, but its search may be complicated by icing or inaccessibility. with No Frost and drip system.
3.1. Freezer with No Frost
In refrigerators with automatic defrosting (for example Indesit ITF 118, Indesit ITS 200), the freezer temperature sensor is usually located:
- 📍 On the evaporator —the most a common option. The sensor is attached directly to the aluminum radiator or plastic evaporator casing.
- 📍 In the air duct, if the freezer has a separate air circulation channel.
- 📍 On the back wall, closer to the top. cameras (rarely).
Externally, the freezer sensor may not differ from the refrigerator sensor, but its wires are usually thicker (due to lower temperatures) and often have additional insulation. In some models, the sensor is combined with defrost sensor in one block.
3.2. Freezer with drip defrosting
In refrigerators without No Frost (for example, Indesit BIA 18, Indesit DF 4180), the freezer sensor is located:
- 📍 On the back wall, next to the evaporator (similar to the refrigerator compartment, but lower).
- 📍 Under the plastic panel on the ceiling of the chamber (found in older models).
- 📍 Inside the evaporator housing —in this case, you will have to remove the back wall for access.
Feature of such models: the sensor is often attached to the evaporator using a metal clamp or thermal paste for better contact. If you see wires coming from the back wall to the control board, most likely one of them leads to the temperature sensor.
⚠️ Attention: In the freezer, the sensor may be covered with ice or frost. Do not try to break off the ice with a knife or other sharp objects - this may damage the evaporator. Use a hair dryer (at minimum temperature) or wait until completely defrosted.
4. How to check the temperature sensor for functionality
Finding the sensor is half the battle. Now you need to make sure that it is working properly. To do this you will need:
- 🔧 Multimeter (in resistance measurement mode).
- 🔧 Thermometer (preferably electronic, with a remote probe).
- 🔧 Screwdriver (for dismantling panels).
- 🔧 Hair dryer (if the sensor is frozen).
Check procedure:
- Unplug the refrigerator and wait until the temperature in the chambers is equal to room temperature.
- Remove the protective casing or panel to gain access to the sensor. Carefully disconnect the connector with the wires (remember or take a photo of the connection order!).
- Connect the multimeter probes to the sensor contacts and measure the resistance. At room temperature (+20...+25°C) it should be within 4–7 kOhm (exact values depend on the sensor model).
- Place the sensor in a glass of cold water (or apply ice) and measure the resistance again. It should increase (as the temperature decreases, the thermistor resistance increases).
- If the resistance does not change or is zero/infinity, the sensor is faulty.
For more accurate diagnostics, you can compare the readings with standards for your model. For example, for sensors Indesit series NTC (negative temperature coefficient), the dependence of resistance on temperature is as follows:
| Temperature (°C) | Resistance (kOhm) for NTC sensor |
|---|---|
| +25 | 4.5–5.5 |
| 0 | 12–15 |
| −18 | 35–45 |
| −24 | 50–60 |
If the sensor does not pass the test, it must be replaced. It is important to choose an analogue with the same characteristics (type of thermistor, resistance at +25°C, number of contacts).
☑️ Preparation for replacing the temperature sensor
5. Typical mistakes when finding and replacing a sensor
Even experienced craftsmen sometimes make mistakes when working with temperature sensors in refrigerators Indesit. Here are the most common of them:
- ❌ The temperature sensor is confused with the defrost sensor. The latter is located only in the freezer compartment on the evaporator and has a different operating principle.
- ❌ Do not check resistance at different temperatures. The sensor may show normal resistance at room temperature, but fail when cooled.
- ❌ The wires are damaged during dismantling. Sensor wires are often fragile and can break at the base. Gently bend them when disconnecting.
- ❌ Do not take into account the model of the refrigerator. Sensors for No Frost and drip systems are not interchangeable!
- ❌ Forgetting to check the control board. Sometimes the problem is not in the sensor, but in oxidized contacts on the board or a burnt resistor.
Another common mistake is ignoring error code on the display (if there is one). In refrigerators Indesit with electronic control, a malfunction of the temperature sensor is often displayed as:
F02,F04—a problem with the refrigerator compartment sensor.F03,F05—a problem with the freezer compartment sensor.F07— malfunction of the defrost sensor (only for No Frost).
⚠️ Attention: If, after replacing the sensor, the refrigerator still does not work correctly, check the power circuit from the control board to the sensor. The problem may be a broken wire or oxidation of the contacts on the connector.
6. When is the best time to contact a technician?
Despite the fact that replacing a temperature sensor is a relatively simple procedure, in some cases it is better to trust a professional:
- 🔧 If the sensor is located in a hard-to-reach place (for example, inside the evaporator housing or behind polyurethane foam insulation).
- 🔧 If after replacing the sensor the refrigerator produces a new error or refuses turn on.
- 🔧 If soldering of wires is required (for example, if there is a break near the sensor).
- 🔧 If the malfunction is accompanied by other symptoms (for example, the compressor does not turn off at all, or traces of burning are visible on the board).
The cost of replacing the temperature sensor in the service center is from 1500 to 3000 rubles (depending on the model and region). If you are not confident in your skills, it is better not to take risks - incorrect replacement can lead to a short circuit or failure of the control board.
Also pay attention to the warranty: if the refrigerator was purchased less than a year ago, repairs should be free (provided that the breakdown is not caused by mechanical damage).
7. Prevention of problems with temperature sensors
To make the temperature sensors in your Indesit last longer, follow simple steps recommendations:
- ✅ Defrost the refrigerator regularly (even if it has No Frost). Accumulated ice can damage the sensor or its wires.
- ✅ Do not place hot foods in the refrigerator compartment - a sharp temperature change negatively affects operation. thermistor.
- ✅ Keep the door seals clean. If they are worn out, warm air enters the chamber and the sensor operates in enhanced mode.
- ✅ Do not use sharp objects to remove ice - you can accidentally damage the sensor or wires.
- ✅ Check the temperature periodically in the chambers using a separate thermometer. If it differs greatly from the specified one, this is a reason to check the sensor.
Pay special attention to refrigerators with No Frost: in them, sensors more often fail due to constant air circulation and icing. If you notice that the fan has become louder or an uncharacteristic noise has appeared, this may be the first sign of problems with the defrosting system. sensors.
It is also useful to clean the back wall of the refrigerator from dust every six months (especially if it is located close to the wall). Dust can clog the air ducts and lead to overheating of components, including sensors.
Frequently asked questions
Is it possible to replace the temperature sensor yourself, if not? experience?
Yes, but only if the sensor is located in an accessible place (for example, on the back wall of the refrigerator). To do this, just disconnect the old sensor, connect the new one and secure it in place. The main thing is not to mix up the wires and make sure that the new sensor is suitable for the specifications. If the sensor is hidden inside the case or requires soldering, it is better to contact a specialist.
How to find out which temperature sensor is suitable for my model. Indesit?
The most reliable way is to find the original part number of the sensor in the instructions or on the nameplate of the refrigerator (usually on the back wall). You can also use online spare parts catalogs (for example, PartMaster, AllSpare), where compatible parts will be selected based on the refrigerator model. Pay attention to the resistance of the sensor at +25°C - it should match the one. original.
What to do if after replacing the sensor the refrigerator does not turn on?
First, check that the wires are connected correctly - you may have mixed up the contacts. If everything is connected correctly, measure the resistance of the new sensor: it may be defective. Also inspect the control board for burnt elements or oxidized contacts. If the refrigerator does not respond at all, the protection may have tripped. disconnect it from the network for 10-15 minutes, then turn it on again.
Can a faulty temperature sensor lead to a breakdown of the compressor?
Yes, but indirectly. If the sensor transmits incorrect data, the compressor may work without stopping (overheat) or, conversely, turn on too rarely (which leads to spoilage of products). wear of the compressor. However, the sensor itself cannot “burn out” the compressor - for this, additional factors are needed (for example, a malfunction of the start relay or a freon leak).
How often should you check the temperature sensors in the refrigerator?
For preventive purposes, there is no need to check the sensors - they are designed for a long service life (5–10 years). However, if you notice signs of a malfunction (incorrect temperature, constant operation of the compressor, errors on the display), it is worth carrying out diagnostics. It is also recommended to check the sensors after strong power surges or long power outages.