How the thermostat in the Indesit refrigerator is designed and works: principle of operation, setup and diagnostics

The thermostat (or thermostat) is a key element of the refrigerator Indesit, which is responsible for maintaining the set temperature in the chambers. Without it, the compressor would either work continuously or not turn on at all. In this article, we will look in detail at how the thermostat works, on what principle it controls cooling, and what signs indicate its malfunction. You will also learn how to independently check and adjust the thermostat in models Indesit of different generations.

A feature of the thermostats in refrigerators of this brand is their adaptability to operating conditions. For example, in models with a No Frost system, the thermostat interacts not only with the compressor, but also with the fan, and in classic drip refrigerators - with the defrost heater. We will look at both options, and also explain why sometimes the thermostat works more often than usual and what to do about it.

If you notice that the refrigerator Indesit has become worse at freezing, turns on too often, or, conversely, “falls asleep” for a long time, the problem may lie precisely in the thermostat. But before you run to the service center, it’s worth understanding its operation - perhaps you can fix the malfunction yourself.

Thermostat device in Indesit refrigerators

Thermostat in refrigerators Indesit is an electromechanical or electronic device that consists of several key elements:

• 🔹 Bellows tube —a sealed capillary tube filled with refrigerant (usually freon or its equivalent). It reacts to changes in temperature by expanding or contracting.
• 🔹 Contact group - mechanical contacts that close or open when a certain temperature is reached, turning the compressor on/off.
• 🔹 Adjustment knob - allows the user to set the desired temperature mode (usually from 1 to 5 or 7, where 1 is the warmest setting).
• 🔹 Spring mechanism - provides the necessary force to open the contacts when the set temperature is reached.

In electronic models Indesit (for example, series BIAA 13 or TLAA 10) instead of a mechanical thermostat, a resistance sensor is used, which transmits signals to the control board. Such systems are more accurate, but also more difficult to diagnose. Mechanical thermostats, on the contrary, are easier to repair and cheaper to replace. thermistor — a resistance sensor that transmits signals to the control board. Such systems are more accurate, but also more difficult to diagnose. Mechanical thermostats, on the other hand, are easier to repair and cheaper to replace.

The bellows tube of the thermostat is usually attached to the evaporator (in the freezer or refrigerator) and reacts to its temperature. When the refrigerant in the tube cools, its pressure drops and the contacts open - the compressor stops. When the temperature rises, the process occurs in the reverse order.

The principle of operation of the thermostat: how it controls the compressor

The operation of the thermostat in the refrigerator Indesit is based on the on/off cycle of the compressor. Let's look at the process step by step:

1. Temperature setting. The user turns the thermostat knob (for example, to position 3), setting the target temperature in the chamber.
2. Starting the compressor. If the temperature in the refrigerator is higher than the set one, the thermostat contacts are closed and the compressor operates, cooling the chamber.
3. Reaching the set temperature. When the air in the chamber is cooled to the desired temperature, the refrigerant in the bellows tube is compressed, opening the contacts. The compressor stops.
4. Pause until the next cycle. Until the temperature rises by 2–4°C (hysteresis value), the thermostat remains open.

Important nuance: in refrigerators Indesit s one compressor the thermostat usually controls both chambers (refrigerator and freezer), but priority is given to the freezer. In models with two compressors (for example, Indesit ITF 118), each thermostat operates independently.

Hysteresis is the difference between the temperature when the compressor turns on and off. For example, if the thermostat is set to +4°C, the compressor may turn on at +6°C and turn off at +2°C. This difference prevents the relay from operating too frequently.

Where is the thermostat located in the refrigerator Indesit

The location of the thermostat depends on the refrigerator model. In most cases, it can be found in the following places:

• 🔧 In the refrigerator compartment — inside the plastic case next to the temperature control knob (for example, in models Indesit BIA 10 or C 132 G).
• 🔧 Behind the top panel — in some two-chamber refrigerators, the thermostat is hidden under a decorative cover (you need to unscrew the screws).
• 🔧 In the freezer chamber — in models with No Frost (for example, Indesit ITF 118) the thermostat can be located next to the evaporator.
• 🔧 On the back wall —in older models (before 2010), the thermostat was sometimes mounted outside, next to the compressor.

To get to the thermostat in the refrigerator compartment, it is usually enough to remove the plastic cover or unscrew the mounting screws. electronically controlled (for example Indesit ITR 5200 W) instead of a mechanical thermostat you will find a temperature sensor connected to the board.

If you are not sure about the location of the thermostat, refer to the instructions for your model, for example, in refrigerators Indesit series. data-i="116">The thermostat is located on the right inside the refrigerator compartment, and in series BIAA The thermostat is located on the right inside the refrigerator compartment, and in the series TIA - under the top panel.

How to remove the panel with the thermostat in Indesit BIA 10?

Carefully pry up the plastic cover on the side of the temperature control knob (you can use flat screwdriver). Under it you will find fastening screws. Unscrew them and remove the panel - the thermostat will be fixed to the metal plate.

Signs of a malfunctioning thermostat

If the thermostat in the refrigerator Indesit fails, this manifests itself in several typical ways. symptoms:

One of the most obvious signs is The compressor does not switch off even when the minimum temperature is reached. This means that the thermostat does not open the circuit and the refrigerator is working “to wear out.” The other extreme is that the compressor does not turn on at all, although the chamber is warm. In this case, the thermostat is most likely open and does not give a signal to start. data-i="140">the compressor does not turn off even when the minimum temperature is reached

Sometimes a thermostat malfunction is confused with compressor problems or a freon leak. To accurately diagnose a breakdown, you need to check the thermostat with a multimeter (more on this in the next section).

⚠️ Attention: If a refrigerator Indesit with electronic control (for example ITF 118) stops responding to temperature settings, the problem may lie not in the thermostat, but in the control board. In this case, independent repair is not recommended - diagnostics are required at a service center.

How to check the thermostat of an Indesit refrigerator with a multimeter

Checking the thermostat with a multimeter is the most reliable method of diagnosis. You will need:

• 🔧 Multimeter (in continuity or resistance measurement mode).
• 🔧 Screwdriver for removing the thermostat panel.
• 🔧 Hair dryer (to simulate heating, if necessary).

Testing algorithm:

1. Disconnect the refrigerator from the network and remove the panel to gain access to the thermostat.
2. Disconnect the wires from the thermostat contacts (remember or take a photo of their location!).
3. Switch the multimeter to dialing mode and connect the probes to the contacts 3 i 4 (usually these are the terminals for the compressor).
4. At room temperature, the contacts should be closed (the multimeter will make a beep).
5. Carefully heat the thermostat bellows tube with a hairdryer (not higher than 40–50°C). When heated, the contacts should open.
6. Allow the thermostat to cool - the contacts should close again.

If the contacts do not open when heating or do not close when cooling, the thermostat is faulty and requires replacement. In electronic models Indesit instead of testing, check the resistance of the thermistor (usually it should be within 5–10 kOhm at room temperature).

⚠️ Attention: B refrigerators Indesit with a system No Frost the thermostat can be connected to the defrost timer. If after checking the thermostat the problem remains, make sure that the evaporator is not covered with ice - this may block the operation of the sensors.

Adjusting and replacing the thermostat in the Indesit refrigerator

If the thermostat is working, but the refrigerator is not working correctly, it may need to be adjusted. In mechanical thermostats Indesit setting is carried out using adjustment screwlocated under the plastic handle cover. Turning the screw clockwise increases the response temperature (the compressor will turn on less often), counterclockwise - decreases it.

To replace the thermostat:

1. Purchase a similar thermostat (specify the model of the refrigerator, for example Indesit BIA 10 or C 132 G).
2. Disconnect the refrigerator from the network and remove the panel with the thermostat.
3. Disconnect the bellows tube from the evaporator and the wires from the contacts (remember their location!).
4. Install a new thermostat, connect the tube and wires in the opposite direction in order.
5. Start the refrigerator and check operation within 12-24 hours.

In electronic models, replacing the thermistor requires care - the sensor is usually attached to the evaporator with thermal paste. When installing a new sensor, use the same paste for reliable thermal contact.

Cost of the thermostat. for Indesit varies from 800 to 2500 rubles depending on the model. For example, a thermostat for Indesit BIA 10 will cost ~1200 rubles, and for ITF 118 (with a system No Frost) - up to 2000 rubles.

Frequently asked questions about Indesit thermostats

Why does the Indesit refrigerator not turn off? even if you set the minimum temperature?

This is a sign of “sticking” of the thermostat contacts. Possible reasons:

• Wear of the contact group (replacement of the thermostat is required).
• Moisture ingress or oxidation of the contacts (you can try cleaning them with alcohol).
• Faulty compressor (if it works, but does not cool).

First check the thermostat with a multimeter. If the contacts do not open when heated, replace it.

Is it possible to repair the thermostat or just replace it?

Mechanical Thermostats in refrigerators Indesit are usually not repaired - they are replaced with new ones. Exception: if the problem is in oxidized contacts, they can be cleaned with sandpaper or alcohol. In electronic thermostats, repair is possible only in a service center (for example, if the board tracks are damaged).

Which thermostat is suitable for Indesit BIA. 10?

Thermostats K59-L1954 or Danfoss 077B6007are suitable for this model. When purchasing, specify that you need a thermostat for single-chamber a refrigerator with mechanical control. Some stores may offer universal analogues, but it is better to take the original.

Why did the refrigerator begin to freeze more after replacing the thermostat?

Possible reasons:

• The new thermostat is adjusted to a lower temperature (you need to tighten the adjustment screw).
• Bellows the tube is not attached correctly to the evaporator (check its position).
• The thermostat itself is faulty (defective or incompatible model).

Let the refrigerator operate for 24 hours - the temperature may stabilize. If not, check the settings.

Can the thermostat affect the formation of ice in the refrigerator No Frost?

Yes, but indirectly. In models Indesit c No Frost the thermostat controls not only the compressor, but also the defrost timer. If the thermostat is faulty, the timer may not turn on the evaporator heating, which will lead to icing. In this case, a comprehensive one is required. diagnostics.