If your refrigerator Indesit starts to malfunction - it does not turn off, does not freeze well, or, conversely, freezes food - the problem may lie in a faulty one temperature sensor. This small but critical element is responsible for the correct operation of the thermostat and compressor. In 70% of cases, replacing the sensor solves the problem without expensive repairs.
Many users are afraid to undertake repairs themselves for fear of damaging the equipment. However, the procedure for replacing the sensor in models Indesit (for example, BIAA 13, DF 4180 or C 138 NF) is quite within the capabilities of even a beginner - provided that the instructions and safety measures are followed. In this article you will find step-by-step guide with photosa list of necessary tools, as well as tips on how to avoid common mistakes.
Signs of a malfunctioning temperature sensor
The first step is to accurately diagnose the problem. Do not rush to disassemble the refrigerator: perhaps it is not the sensor that is to blame, but the thermostat or a freon leak. Pay attention to the following symptoms:
🔹 The compressor runs without stopping — if the motor hums constantly and the chamber is too cold (or, conversely, warm), the sensor is likely transmitting incorrect data to the control board. In models with No Frost this often leads to icing of the fan.
🔹 Errors on the display - modern refrigerators Indesit (for example, series EWT or SBA) fault codes. Temperature sensors are characterized by errors:
- 🔴
F04—problem with the evaporator sensor; - 🔴
F05—freezer compartment sensor is faulty; - 🔴
F07—failure of the refrigerator compartment sensor.
If the display lights F02 or F03, the problem is most likely in the thermostat or the board - replacing the sensor will not help here.
🔹 Temperature mismatch - check the indicators with a thermometer. If in the freezer –18°C when set to -24°C, and the refrigerator compartment produces +10°C instead of +5°C, the sensor definitely needs to be replaced.
⚠️ Attention: B refrigerators Indesit with a system Full No Frost (for example, BIAA 20) a faulty sensor can lead to fan failure and a complete stop of cooling. Do not ignore errorsF04–F07!
Types of sensors in Indesit refrigerators and their location
Depending on the model, there can be from 1 to 3 sensors in the refrigerator. Their appearance and installation location differ:
| Sensor type | Where it is located | Appearance | Indesit models |
|---|---|---|---|
| Evaporator sensor | On evaporator tube (behind the back wall of the freezer) | Plastic case with a wire, often wrapped in foam | DF 5200, C 132 NF, BIA 18 |
| Freezer chamber sensor | At the top of the freezer, under the lid | Round or oval, with metal tip | SBA 16, EWT 25, TIA 16 |
| Refrigerator compartment sensor | On the back wall of the main chamber, next to the lamp | Flat, often attached to a plastic panel | BIAA 13, DF 4180, C 138 |
In models with electronically controlled (display on door) the sensors are connected to the board via connectors. In mechanical refrigerators (adjustment with a wheel), there is usually only one sensor - it is built into the thermostat.
💡 How to find the sensor? Unplug the refrigerator, remove the back panel of the freezer (in models No Frost) or the plastic cover on the back wall of the refrigerator compartment. The sensor will be attached to the tube or panel with two screws or clips.
Tools and materials for replacement
For work you will need:
- 🔧 Phillips and flathead screwdrivers (for removing panels and fastenings);
- 🔨 Pliers (for working with connectors);
- 📸 Smartphone (to photograph the location of wires);
- 🧲 Magnet or tape (to temporarily secure the removed parts);
- 🛠️ New sensor (buy the original or an analogue with the same parameters).
🔌 Important: When purchasing a sensor, check it resistance (usually 5–50 kOhm at +25°C) and connection type. For models Indesit suitable are sensors from Danfoss, Sensata or EGO.
🛒 Where to buy?
- 🏬 In service centers Indesit (warranty on the part);
- 🌍 At AliExpress or eBay (cheaper, but longer delivery);
- 🔧 In stores of spare parts for household appliances (for example, 220-Volt, All-Spare).
⚠️ Attention: Do not use sensors from other brands (for example, Samsung or LG) - even if they look similar. The difference in resistance or wire length can damage the control board!
Step-by-step instructions for replacing the sensor
Before starting work unplug the refrigerator and defrost it (if there is ice). Prepare a place for disassembly - place a soft cloth so as not to scratch the body.
Disconnect the refrigerator from sockets|Defreeze (if there is ice)|Remove shelves and drawers|Prepare tools|Take a photo of the location of the wires-->
1. Removing the back panel
In models with No Frost (for example, Indesit BIA 18):
- Remove the top cover freezer, pulling it towards you.
- Unscrew the screws around the perimeter of the rear panel (usually 4-6 pieces).
- Carefully remove the panel - under it you will see the evaporator and sensor.
In models with drip system (for example, Indesit DF 4180):
- Remove the plastic plug on the back wall of the refrigerator compartment.
- Unscrew 2-3 screws holding the panel.
- Disconnect the clips and remove the panel - the sensor will be attached to the tube.
2. Disconnecting the old sensor
📌 Carefully! Do not pull the wires - this can tear off the contacts. Proceed according to the diagram:
- Take a photo of the location of the wires and connectors.
- Disconnect the sensor connector from the board (in models with electronic control) or from the thermostat (in mechanical models).
- Unscrew the fastening screws or remove the clips holding the sensor.
- Carefully pull the sensor out of its seat.
🔍 In some models (for example Indesit C 132 NF), the sensor is secured with double-sided tape. To remove it, warm the mounting location with a hairdryer (not higher than +50°C!).
3. Installing a new sensor
Before installation, check the new sensor. multimeter:
- Switch the tester to resistance measurement mode (20 kOhm).
- At room temperature (+20–25°C) the resistance should be within
10–50 kOhm(see the refrigerator data sheet for exact values). - Warm the sensor with your hand - the resistance should decrease (for NTC sensors).
🛠️ Installation:
- 🔌 Connect the connector of the new sensor to the board or thermostat.
- 🔩 Secure the sensor in its original place (screws/clips/adhesive tape).
- 📋 Make sure that the wires are not pinched and do not touch moving parts (the fan in No Frost).
4. Assembly and testing
Assemble the refrigerator in the reverse order:
- Install the back panel and secure with self-tapping screws.
- Replace the shelves and drawers.
- Connect the refrigerator to the network.
⏳ Check:
- 🕒 Wait 1-2 hours - the compressor should turn on and off several times.
- 🌡️ Check the temperature with a thermometer (in the freezer should be -18°C, in the refrigerator compartment +4...+5°C).
- 📵 If the error appears on the display again, check the connections of the connectors or replace the control board.
Common mistakes and how to avoid them
Even experienced technicians sometimes make mistakes when replacing the sensor. Here are the most common ones:
- 🔌 Incorrect connection of connectors — mixed up wires can damage the board!
- 🔩 Pressed wires —if the sensor cable is bent, the signal will be interrupted. Use plastic ties to secure it.
- ❄️ Incomplete defrosting —ice on the evaporator can prevent the correct installation of the sensor. Defrost the refrigerator for at least 12 minutes. hours.
- 📏 Mismatch of sensor model —the sensor from Indesit DF 5200 is not suitable for Indesit BIA 13, even if they are externally identical.
💥 The most dangerous mistake — turning on the refrigerator with an unconnected sensor. This can burn the control board! Always check the connection before turning on power.
⚠️ Attention: In refrigerators Indesit with an inverter compressor (series EWT) incorrect replacement of the sensor can lead to firmware failure. If you are not sure, contact the service!
How much does it cost to replace the sensor in the service?
If you do not want to take risks and decide to turn to professionals, here are the estimated prices (for 2026) year):
| Type of work | Cost (₽) | Time frame |
|---|---|---|
| Fault diagnosis | 500–1 200 | 30–60 minutes |
| Replacement of temperature sensor (1 pc.) | 1 500–3 000 | 1–2 hours |
| Replacement of sensor + defrost | 2 500–4 000 | 2–3 hours |
| Replacement of control board (in case of combustion) | 4 000–7 000 | 1 day |
💰 Advice: If the refrigerator is under warranty, do not disassemble it yourself - this will void the warranty. Contact an authorized service. Indesit.
🔧 Independent repair vs. service:
- ✅ Advantages of self-replacement: savings 1 500–3,000 ₽, experience, no waiting for a technician.
- ❌ Cons: risk of damaging the board, loss of warranty, possible errors during assembly.
What to do if the refrigerator works after replacing the sensor worse?
If the temperature does not stabilize, check:
1) The tightness of the door seals (possibly leaking warm air).
2) The operation of the fan in No Frost models (it should spin without noise).
3) Setting the thermostat (in mechanical models, the regulator could have gone astray).
If the problem remains, there is likely a compressor malfunction or a freon leak.
FAQ: Frequently asked questions about replacing the sensor in Indesit
Is it possible to replace the sensor without defrosting the refrigerator?
In most cases, no. Ice on the evaporator prevents access to the sensor and increases the risk of damage to the wires. The exception is models with dry freezing (for example, Indesit SBA 16), where ice is formed in a minimal amount. But even here it is recommended to defrost the refrigerator for 2-3 hours.
How to check a temperature sensor with a multimeter?
Switch the tester to resistance measurement mode (20 kOhm). At room temperature (+20–25°C), the sensor resistance NTC should be:
- 🔹 10–15 kOhm for evaporator sensors;
- 🔹 25–50 kOhm for camera sensors.
Warm the sensor with your hand - there should be resistance fall. If the readings do not change or are equal to zero, the sensor is faulty.
What to do if, after replacing the sensor, the refrigerator does not turn on?
Probable reasons:
- 🔌 Unconnected connector - check whether the sensor plug is seated tightly in the board.
- ⚡ Short circuit —if you damaged the wires during installation, the fuse on the board could have burned out.
- 📱 Firmware failure —in models with a display (for example, Indesit EWT 25) shutdown sensor may cause a board error. Try turning off the refrigerator for 10 minutes, then turning it on again.
If the refrigerator does not respond, contact service - you may need to replace the control board.
Where to buy an original sensor for Indesit?
Original sensors sold:
- 🏬 In branded service centers Indesit (1 year warranty).
- 🛒 In spare parts stores (for example, 220-Volt, All-Spare).
- 🌍 On AliExpress (search by sensor code, for example
Indesit NTC 10K).
🔍 How not to run into a fake? Compare the photo of the sensor with the original (on the website Indesit or in the documentation). Pay attention to:
- 🔹 Markings on the body;
- 🔹 Color and length of the wire;
- 🔹 Connector type (must match the old sensor).
Is it possible to use a sensor from another brand?
Theoretically yes, but with reservations:
- ✅ A sensor with the same resistance (for example,
NTC 10K). - ✅ The connector must match in shape and number of contacts.
- ❌ Do not use sensors from Samsung, Bosch or Atlant without checking - even if the resistance matches, the temperature characteristic may differ If you can’t find the original, buy a universal sensor.
💡 Life hack: If you can't find the original, buy a universal sensor NTC 10K with a heat-shrinkable tube and connect it through the connector from the old one sensor.