Where is the temperature sensor in the Indesit No Frost refrigerator: search, check and replacement

Refrigerators Indesit with system No Frost equipped with a complex electronic control system, where the temperature sensor plays a key role. This small but critical element is responsible for the correct operation of the compressor, fan and defrost. When the refrigerator starts to freeze poorly, turns on too often or, conversely, “rests” for a long time - in 80% of cases this sensor is to blame. But before you run to the service center, you should figure out where it is and how to check it yourself.

Unlike older models with a drip system, No Frost there can be several temperature sensors: for the refrigerator, freezer, and even for controlling the evaporator. Their location depends on the specific model Indesit (for example, C 132 G, TN 3302 W or DF 5200 W), but there are general search principles. In this article we will figure out how to find a temperature sensor in refrigerators Indesit No Frost, what tools are needed for diagnostics, and what to do if it fails.

Why is it important to know the location of the temperature sensor

The temperature sensor (thermistor) in refrigerators Indesit No Frost is not just “eyes and ears" of the electronic control unit. It directly affects:

• 🔹 Energy consumption: a faulty sensor causes the compressor to work in emergency mode, increasing the electricity bill by 20–30%.
• 🔹 Service life equipment: constant overloads reduce the life of the compressor and fan.
• 🔹 Quality of food storage: incorrect readings lead to freezing or, conversely, spoilage of food.
• 🔹 Operation of the defrost system: in No Frost the evaporator temperature sensor controls the heater, preventing icing.

If the refrigerator Indesit begins to behave inappropriately - for example, the freezer is covered with ice, despite No Frost, or the compressor turns on every 5 minutes - the first check should concern the sensors. Replacing them is 3–5 times cheaper than repairing a compressor or electronic unit.

⚠️ Attention: In refrigerators Indesit with a system Total No Frost (complete No Frost) there can be up to three temperature sensors. If you replace only one and the problem remains, you will have to check the others.

Where is the temperature sensor in the Indesit No Frost refrigerator: diagrams and photos

In models Indesit No Frost temperature sensors are located in three key zones. Their appearance is a small plastic cylinder containing wires, often wrapped in heat shrink tubing. Let's look at each place in detail.

1. Refrigerator compartment sensor

Located behind the plastic panel on the back wall of the refrigerator compartment (not the freezer!). To get to it:

1. Unplug the refrigerator.
2. Remove the shelves and drawers.
3. Carefully pry up the plastic cover on the back wall with a screwdriver (usually it is held on latches).
4. The sensor will be attached to the evaporator or refrigerant tube, often next to the lighting lamp.

Externally it looks like this:

Photo of the refrigeration chamber sensor (example)

The photo shows a white plastic cylinder ~1 cm in diameter with two wires (usually red and white or black). Attached with a clip or double-sided tape.

2. Freezer compartment sensor

Located inside the freezer compartment, but not in a visible place. Most often it can be found:

• 🔹 Behind the back panel of the freezer (you will have to remove the inner lining).
• 🔹 Next to the fan No Frost (in this case it controls the temperature air).
• 🔹 On the evaporator tube (attached with a clamp or clip).

In models Indesit s dual cooling system (for example, Indesit ITF 118) the freezer sensor can be hidden under the ice tray. To see it, sometimes you have to remove the inner lid of the freezer.

3. Evaporator sensor (for the No Frost system)

This is the most “capricious” sensor, since it is responsible for the defrost operation. Located directly on the evaporator (a radiator that cools the air) and is often covered with frost or ice. To get to it:

1. Unplug the refrigerator and defrost it for 12-24 hours.
2. Remove the back panel of the freezer (you will need a Phillips screwdriver).
3. The evaporator looks like aluminum radiator - the sensor is attached to it with a plastic clamp.

In some models (for example, Indesit BIAA 13) the evaporator sensor can be hidden under a layer of thermal insulation. Be careful: if you dismantle it carelessly, you can damage the freon tubes.

Symptoms of a faulty temperature sensor

A faulty temperature sensor in the refrigerator Indesit No Frost manifests itself in different ways. Here are the key symptoms that should alert you:

• ❄️ Constant operation of the compressor no shutdowns (or, conversely, too infrequent switching on).
• 🔥 Freezing products in the refrigerator compartment (food turns into ice).
• 💧 Water accumulation under the vegetable drawers (due to improper defrosting).
• ⚠️ Errors on the display: F04, F05, F07 (indicate problems with sensors).
• 🌀 The No Frost fan works without stopping or does not turn on in general.
• 🧊 Ice on the back wall of the freezer (despite the No Frost system).

If the refrigerator Indesit gives error F04, this almost always means an open circuit of the temperature sensor. Error F05 indicates a short circuit. In both cases, a check with a multimeter is required.

⚠️ Attention: If the refrigerator Indesit No Frost stops freezing, but the light inside is on and the compressor is humming, do not rush to blame the sensor. First, check whether overheating protection has worked (for example, due to poor ventilation).

How to check a temperature sensor with a multimeter: step-by-step instructions

Check temperature sensor (thermistor) in the refrigerator Indesit requires a multimeter with a resistance measurement function (ohmmeter). Here's how to do it right:

Disconnect the refrigerator from the network|Remove the plastic panel to access the sensor|Disconnect the sensor connector from the wiring|Write down the colors of the wires (for correct connection)|Prepare a multimeter ("200 kOhm" mode)-->

Step 1: Removing the sensor

Carefully disconnect sensor connector from wiring. If the connector is stuck, do not pull it - it is better to pry it off with a flat screwdriver. Remember or photograph the location of the wires (usually red is positive, black/white is negative).

Step 2: Resistance measurement

Switch the multimeter to resistance measurement mode (range 200 kOhm). Connect the probes to the sensor contacts and measure the indicators:

• 🔹 At room temperature (~20°C) the resistance should be 5–7 kOhm.
• 🔹 If you blow on the sensor (cool), the resistance should increase.
• 🔹 If you heat the sensor with your hands, the resistance should decrease.

If the resistance:

• 🔹 = 0 → short circuit (sensor defective).
• 🔹 = ∞ (infinity) → open circuit (sensor is faulty).
• 🔹 does not change when heating/cooling → sensor “dead”.

Step 3: Checking the circuit

If the sensor is working, but the refrigerator gives an error, check the circuit from the sensor to the electronic unit:

1. Disconnect the connector from the control board (usually it is located at the bottom of the refrigerator, under the lid).
2. Ring the wires from the sensor to the board for break.

If the circuit is intact, but the problem remains, the electronic unit itself may be faulty.

How to replace the temperature sensor in an Indesit No Frost refrigerator

If the check shows that the sensor is faulty, it needs to be replaced. To do this you will need:

• 🔧 Phillips and flathead screwdrivers.
• 🔌 New sensor (suitable for your model Indesit).
• 📸 Camera (to record the location of the wires).
• 🧲 Magnet or tape (to temporarily secure the sensor during installation).

Step-by-step replacement

1. Unplug the refrigerator unplug and defrost it (if access to the evaporator is required).
2. Remove the plastic panel, behind which the sensor is hidden (the method of removal depends on the model).
3. Disconnect the connector of the sensor from the wiring. If the connector is jammed, carefully pry it out with a screwdriver.
4. Remove the sensor from the mount (it can be glued, pressed with a clip or clamp).
5. Install a new sensor, securing it in the same position. Use a magnet or tape to prevent it from falling during assembly.
6. Connect connector and return the plastic panel to its place.
7. Turn on the refrigerator and check if the error has disappeared.

If after replacing the sensor the refrigerator Indesit still does not work correctly, check:

• 🔹 The wires are connected correctly (colors should match).
• 🔹 Integrity of connectors (sometimes contacts oxidize).
• 🔹 Operation of the electronic unit (a resistor or transistor may have burned out).

⚠️ Attention: In refrigerators Indesit with a system Total No Frost after replacing the evaporator sensor, you may need to reset the errors. To do this, unplug the refrigerator for 10-15 minutes.

Common mistakes when replacing a temperature sensor

Even experienced technicians sometimes make mistakes when working with temperature sensors refrigerators Indesit No Frost. Here's what you can't do:

• ❌ Use a sensor from a different model. Even if it is externally identical, the resistance may be different. For example, a sensor from Indesit C 132 G is not suitable for Indesit DF 5200 W.
• ❌ Solder the wires directlyThis will break the circuit and may cause damage. short circuit. Always use original connectors.
• ❌ Cover the sensor with thermal insulation. It must be in contact with air or the evaporator.
• ❌ Ignore errors after replacementIf the refrigerator continues to produce heat. data-i="222">or F04 or F05, the problem may be in the control board.

Another common error is incorrect installation of the evaporator sensorIf it touches the freon tubes or the fan, the readings will be. incorrect. The sensor must be attached to the evaporator itself (radiator), but not touch other metal parts. Incorrect installation of the evaporator sensor If, after replacing the sensor, the refrigerator begins to operate louder, check whether the sensor is touching the fan blades. vibration and noise.

Where to buy a temperature sensor for Indesit No Frost and how much does it cost

Temperature sensors for refrigerators Indesit No Frost sold in three places:

When purchasing, pay attention to:

• 🔹 Refrigerator model (sensors for Indesit C 132 G and Indesit BIAA 13 may differ).
• 🔹 Sensor type (for refrigerator, freezer or evaporator).
• 🔹 Resistance (must be indicated in the specifications, usually 5–7 kOhm at 20°C).

If you are not sure of the choice, take the old sensor with you to the store or take a photo it on all sides (including markings).

⚠️ Attention: On AliExpress they often sell “universal” temperature sensors for refrigerators. They may not be suitable for Indesit No Frostas they have a different resistance. Before purchasing, check with the seller whether the sensor is compatible with your model.

FAQ: Frequently asked questions about temperature sensors in Indesit No Frost

Is it possible to repair a temperature sensor or just replace it?

A temperature sensor (thermistor) is a semiconductor element that cannot be repaired. If it fails, it can only be repaired. replace. Attempts to solder or “reanimate” the sensor lead to incorrect operation of the refrigerator and the risk of a short circuit.

How to understand which sensor is broken if there are several of them?

If the refrigerator produces a specific error (for example, F04), check the instructions - it indicates which sensor is responsible for this error. If there are no errors, check the sensors one by one with a multimeter, starting with the most accessible one (refrigerator compartment). Also, focus on the symptoms:

• Problems in the refrigerator compartment → refrigerator compartment sensor.
• Ice in the freezer → freezer or evaporator sensor.
• The fan does not turn off → evaporator sensor.

What to do if after replacing the sensor the refrigerator still does not work?

Possible reasons:

1. The wires are connected incorrectly (check the polarity).
2. The electronic control unit is faulty (diagnostics required).
3. The problem is in another sensor (if there are several of them).
4. Forgot to reset the error (unplug the refrigerator for 10 minutes).

If nothing helps, contact the service center - there may be a problem compressor or freon leak.

Is it possible to temporarily operate a refrigerator without a temperature sensor?

Technically yes, but this is highly not recommended. Without a sensor, the electronic unit will not be able to control the compressor correctly, which will lead to:

• Overheating and breakdown. compressor.
• Product spoilage due to unstable temperature.
• Icing of the evaporator (in models No Frost).

If the sensor is broken, replace it as soon as possible. As a last resort, you can temporarily connect a working sensor from another chamber (for example, a freezer instead of a refrigerator), but this is a solution for 1-2 days maximum.

How often should you check the temperature sensors in an Indesit refrigerator?

Temperature sensors do not have a fixed service life, but they should be checked when the first signs of a malfunction appear (see the section “Signs of a malfunction”) For preventive purposes, diagnostics once every 3-5 years are sufficient, especially if the refrigerator is more than 7 years old. Also check the sensors after:

• Strong power surges in the network.
• Long-term shutdown of the refrigerator (for example, when moving).
• Independent repair (for example, after replacing the compressor).