Owners of refrigeration equipment are often faced with a situation where the equipment ceases to maintain the set temperature. Indesit refrigerator temperature sensor - this is a key element of the control system, which is responsible for reading readings inside the chambers and sending commands to the compressor. When this component fails or moves from its normal place, the unit begins to work incorrectly, either freezing products to the state of ice, or leaving them at above-zero temperatures.
Searching for this element may be difficult due to the design features of different models, such as Indesit DS 320 or more modern series with the system No Frost. Depending on the type of control (mechanical or electronic), the physical location of the thermostat or electronic sensor may differ significantly. Understanding where exactly the sensitive element is located in your modelis the first step to successful diagnosis and restoration of the device.
In this article we will analyze in detail the design features of various modifications so that you can accurately determine the location of the sensor. We'll look at the differences between mechanical thermostats and electronic thermistors, and discuss how to access them without damaging the insulation or plastic panels. This knowledge will help you save time and avoid unnecessary expenses on calling a technician for a simple check.
Differences between mechanical and electronic controls
The first thing you need to determine before starting your search is the type of control your refrigerator has. Older and budget models of the brand Indesit most often use a mechanical thermostat. This device is a sealed capsule with gas or liquid connected to a bellows, which opens or closes electrical contacts when the pressure inside the sensitive tube changes.
In more modern units equipped with an electronic display on the door, the control function is performed by electronic sensors, or thermistors. Their operating principle is based on a change in electrical resistance depending on the ambient temperature. Such elements are compact in size and are often integrated directly into the plastic housing of the evaporator or air ducts.
They can be visually distinguished by the presence of a digital display. If you have the ability to select the temperature using buttons on the external panel, it means there is an electronic sensor installed inside. If the adjustment is made by turning the knob with a scale from 1 to 5 or from Min to Max, then you are dealing with a mechanical thermostat, which is usually located inside the refrigerator compartment.
⚠️ Attention: When trying to replace an electronic sensor yourself, it is important to consider that some models require calibration or error reset through the service menu after installing a new part.
Accuracy electronic systems are higher, but they are more sensitive to voltage surges and humidity. Mechanical analogs are highly reliable and maintainable, but their calibration gets lost over time, which leads to incorrect operation of the compressor.
Thermostat location in refrigerators with a drip system
In classic models with a drip defrosting system, such as the popular series Indesit DF, the mechanical thermostat is most often located inside the refrigerator compartment. Its housing is usually hidden behind a plastic cover or integrated into the lighting control panel. To gain access to it, you need to carefully examine the top of the camera.
Fastening is carried out using special latches or screws, which can be hidden under decorative plugs. The panel must be removed carefully so as not to damage the fragile plastic, which becomes especially brittle in the cold. Under the panel you will see the regulator itself with an adjustment knob and a long capillary tube coming out of it.
This tube runs along the inner wall of the chamber and ends with a sensitive cuff, which is attached to the evaporator. It is this cuff that is the sensor that reacts to cold. In some modifications, it can simply be pressed with a metal bracket to the back wall without rigid fixation.
- 🔍 Inspect the upper right corner of the refrigerator compartment - the control unit is most often located there.
- 🔧 Check for hidden screws under the white plastic plugs.
- ❄️ Please note pay attention to the tube coming from the regulator: it should not have kinks or damage to the insulation.
It is important to note that in two-chamber models with one compressor, the sensor always controls the temperature in the refrigerator compartment. The freezer compartment is cooled by the residual principle, so the accuracy of the thermostat is critical to preserving food in both compartments.
Finding a sensor in models with the No Frost system
In refrigerators Indesitequipped with the No Frost system, the situation is more complicated. Here, temperature sensors (thermistors) are located in the air circulation area, often hidden behind plastic evaporator panels. In such models, several sensors can be used: one to control the temperature in the chamber, the other to control the evaporator defrost system.
The main sensor responsible for maintaining the mode is usually located in the air duct through which cold air is supplied to the chamber. To get to it, partial disassembly of the interior lining is often required. In some cases, access is only possible after dismantling the rear wall of the freezer compartment.
Structurally, this is a small plastic element with two wires inserted into a special socket. It has no moving parts like a mechanical thermostat. If this element malfunctions, the refrigerator may not start at all or work without stopping, ignoring the achievement of the desired temperature.
A feature of the No Frost system is that the defrost sensor and the chamber temperature sensor are different elements, although outwardly they may look the same. They cannot be confused, since they have different temperature response thresholds and resistance.
How to distinguish a defrost sensor from a temperature sensor?
The defrost sensor is usually located directly on the evaporator fins or in the lower part, where water accumulates, and is triggered at 0...+5°C. The air temperature sensor is located in the exhaust air flow and controls the general climate in the chamber.
If you are planning a replacement, be sure to check the markings on the part body. Using an unsuitable thermistor will lead to incorrect operation of the compressor and defrost heating element control algorithms.
Instructions for accessing the temperature sensor
The process of gaining access to the sensor requires accuracy and a minimum set of tools. Before starting any work, you must completely turn off the power to the refrigerator by removing the plug from the socket. This safety rule is essential as you will be working with electrical components and metal tools.
First, empty the refrigerator compartment of food and remove the shelves to allow clear access to the rear wall and ceiling. If the sensor is located behind the control panel, carefully pry it out with a flathead screwdriver or plastic spatula. Proceed without sharp jerks so as not to break the plastic clips.
After removing the decorative trim, you will see the thermostat. To remove it, you may need to unscrew the mounting screws. If we are talking about an electronic sensor in the No Frost system, you may have to remove the back panel of the freezer after defrosting the unit for 24 hours.
☑️ Preparation for removing the sensor
When working with a mechanical thermostat, pay special attention to the capillary tube. It should not be bent, squeezed or scratched with sharp objects. Damage to the tube will lead to leakage of the working substance, and the thermostat will have to be thrown away.
Diagnostics and symptoms of malfunction
You can understand that the temperature sensor has failed by a number of characteristic signs. The most obvious symptom is the compressor running continuously without shutting down. The refrigerator hums constantly, trying to gain temperature, but due to incorrect sensor readings it does not receive a command to stop.
The opposite situation is that the compressor does not start at all, although it is warm in the chamber. This may indicate that the contacts inside the thermostat have oxidized or broken, and the power circuit is not closed. Also, a sign of a malfunction may be the motor turning on too often.
To accurately diagnose a mechanical thermostat, you can use the “freezing” method. Remove the thermostat, place its sensitive cuff in the freezer for 15-20 minutes, and then “ring” the contacts with a multimeter. They should ring on a cold sensor and open when heated in the hands.
| Symptom | Probable cause | Action |
|---|---|---|
| The refrigerator does not freeze | Open circuit thermostat | Checking the contacts with a multimeter |
| Continuous operation of the compressor | Sticking of contacts or leakage of freon in the sensor | Replacing the thermostat |
| Severe freezing of the rear walls | Incorrect sensor calibration | Adjustment with the calibration screw or replacement |
| Error on the display (F-code) | Faulty electronic thermistor | Diagnostics of sensor resistance |
Electronic sensors are tested by measuring their resistance at different temperatures. The values must correspond to the reference data for the specific model Indesit. A resistance deviation of more than 10-15% indicates the need for replacement.
Replacement and adjustment of a new regulator
If diagnostics confirm a malfunction, the element is replaced. When installing a new mechanical thermostat, it is important to secure the capillary tube correctly. It must fit tightly to the evaporator in the same place where the old one was fixed, otherwise the temperature readings will be distorted.
For electronic models, the main thing is to ensure reliable contact in the connector and tightness of the connection if the sensor is located in an area of high humidity. After installing the new part, reassemble the refrigerator in the reverse order and turn it on.
The first start-up may take some time. Do not load the chamber with products immediately; let the unit enter operating mode. Mechanical thermostats may require additional adjustment with a calibration screw, which is usually closed with a seal or plug.
⚠️ Attention: It is not recommended to remove factory seals from the adjustment screws yourself if you do not have experience and calibration equipment. In such cases, it is better to replace the entire assembly with the original one.
A high-quality replacement will allow you to restore the correct operating cycle of the refrigerator, which will have a positive effect on the shelf life of food and energy consumption.
Frequently asked questions and answers
Is it possible to temporarily do without a temperature sensor?
Technically, you can start the refrigerator by closing the thermostat contacts, but this will lead to continuous operation of the compressor and deep freezing of food. This mode is dangerous for the motor and is only acceptable as a short-term measure before purchasing a spare part.
Why does the new sensor not fit?
For different models Indesit the length of the capillary tube and the type of fastening may differ. If the tube is too long, it can be carefully rolled into a ring and secured in the free space without bending it. The main thing is to ensure contact of the sensitive element with the cooled surface.
How often do you need to change the temperature sensor?
The service life of a high-quality thermostat is 5-7 years or more. However, if there are frequent power surges or mechanical damage during defrosting, it may fail earlier. There is no specific replacement schedule; repairs are carried out upon failure.
Does replacing the sensor affect the warranty?
Independent intervention in the design of the refrigerator, as a rule, voids the factory warranty. If your unit is still under warranty service, it is strongly recommended to contact an authorized service center.