If your Indesit refrigerator stops freezing or, conversely, has turned into a freezer, in 80% of cases the culprit is the thermostat. This is the heart of the temperature control system and commands the compressor to turn on or off. Finding this unit is not always easy, since manufacturers often hide it in hard-to-reach places to avoid accidental damage during operation.
In this article we will analyze in detail where is the thermostat on the Indesit refrigerator depending on the model and type of control. You will learn how to get to the part, whether you need to remove the entire unit from the wall, and what tools you will need to carry out diagnostics. Correctly determining the location of the element will save you time and money on calling a technician.
Before you start disassembling, it is important to understand that the design may differ. In older models with mechanical control, the regulator is often combined with an adjustment knob inside the chamber, while in modern systems No Frost or with electronic control, sensors can be placed in the evaporation unit or hidden behind decorative panels.
Types of thermostats in Indesit technology
Understanding the type of installed device - the first step to a successful renovation. In refrigerators Indesit most often there are two main types of regulators: mechanical (bellows) and electronic (thermistors). Mechanical models are a housing with a capillary tube, which responds to changes in refrigerant pressure inside the tube. Electronic ones are simple resistance sensors that transmit a signal to the main control board.
Mechanical thermostat usually has an adjustment knob located inside the refrigerator or freezer compartment. Its operation is based on the physical expansion and compression of gas in a capillary. If you hear a characteristic click when you turn the knob or change the temperature, most likely you have this type. They are considered more reliable and less susceptible to power surges in the network.
Electronic sensors, or thermistors, do not have moving parts or handles inside the chambers. They are a small plastic tip, often hidden inside the housing. Their advantage is high accuracy, but they are sensitive to moisture and contact oxidation. In models with a system Full No Frost there may be several such sensors: for air, for the evaporator and for the freshness zone.
⚠️ Attention: Before starting any work to find the thermostat, be sure to disconnect the refrigerator from the power supply. Working with live electrical wiring and internal components is dangerous and can lead to failure of the electronics.
You can determine the type of regulator you have by the presence of a handle inside the chamber. If there is no handle, and the temperature is set by buttons on the outer panel of the door, it means that an electronic sensor is installed inside. In this case, the search shifts from the door to the back wall or evaporator.
Location in models with mechanical control
In classic two-chamber refrigerators Indesit with a drip defrosting system and mechanical control, the thermostat is most often hidden inside the refrigerator compartment. The standard installation location is the upper right corner of the camera, next to the lighting lamp or directly behind the temperature control knob.
To get to the unit, you often need to remove the plastic cover on which the knob is attached. It can be held on by latches or screws hidden under decorative plugs. Carefully lifting the plastic casing, you will see the thermostat block itself, to which a wiring harness and a thin capillary tube fit.
In some models, especially built-in or narrow series, the thermostat may be located outside the chamber. In this case, capillary tube passes through the wall of the housing, and the control unit itself is hidden in a niche above the fridge compartment or in a special compartment in the upper part of the unit, which can be accessed by removing the top cover of the refrigerator.
It is important not to damage the capillary tube during dismantling. This is a thin copper element filled with freon. Any microcrack will lead to a refrigerant leak and will require complex and expensive repairs with recharging the system.
Searching for a sensor in No Frost refrigerators
The situation with searching for a thermostat in models Indesit No Frost is radically different. There is no single regulator with a knob inside the main camera. The main air temperature sensor, which acts as a thermostat, is usually located at the top of the refrigerator compartment, often hidden behind a decorative panel or air duct grille.
To access it, in most cases it is necessary to completely empty the refrigerator compartment, remove all shelves and dismantle the back or side wall (depending on the design). The sensor is a small plastic cylinder suspended in the air flow or mounted on the wall of the air duct. Wiring goes from it to the control unit.
In addition to the air sensor, the evaporator defrost sensor is critically important in the system. It is located in the freezer, directly on the aluminum evaporator radiator. To get to it, you will have to remove the back panel of the freezer, after defrosting the unit for 10-12 hours. No Frost The evaporator defrost sensor is critical. It is located in the freezer, directly on the aluminum evaporator radiator. To get to it, you will have to remove the back panel of the freezer, after defrosting the unit for 10-12 hours.
- 🔍 Air sensor: located in the upper part of the refrigerator compartment, controls the overall temperature.
- ❄️ Defrost sensor: attached to the evaporator in the freezer, turns off the heating element when it reaches a certain temperature.
- ⚙️ Cutoff sensor: prevents overheating, duplicates the function of the defrost sensor in some circuits.
Often users confuse these sensors. If the refrigerator freezes but does not turn off, or operates jerkily, the problem most often lies in the air sensor or its wiring. Checking the resistance with a multimeter will help you accurately determine the malfunction.
☑️ Diagnostics No Frost
Access to the thermostat in the freezer
In single-chamber freezers Indesit or two-chamber models with separate freezer control, the thermostat can be placed in the freezer compartment. In older models, the adjustment knob is often located outside, on the front panel of the door, but the actuator itself is hidden inside the housing.
To get to it, you usually need to remove the top cover of the freezer or dismantle the door. Some designs provide access through the fresh food freezer compartment at the top of the compartment. There, under a layer of thermal insulation, the control unit is located.
The plastic becomes brittle, and the rubber seals lose their elasticity. When disassembling, be extremely careful not to crumble the plastic fasteners or damage the insulation of the wires.
⚠️ Attention: Freezers often use a specific lubricant for moving parts. Do not use ordinary household oils to lubricate mechanisms, as they can freeze and jam the unit.
If you find that the thermostat is in a hard-to-reach place, covered with foam or hidden by a complex structure, it may make sense to turn to professionals. Incorrect assembly can damage the tightness of the chambers and thermal insulation.
Model and location correspondence table
To simplify the search, we have compiled a table that will help you navigate depending on the series of your refrigerator. Please note that within the same series the manufacturer may make changes to the design, so visual inspection is required.
| Series / Model Indesit | Control type | Thermostat location | Access features |
|---|---|---|---|
| Indesit C 138 | Mechanics | Inside the refrigerator compartment (right) | Remove the light shade and plastic cover |
| Indesit DF 4180 | Electronics (No Frost) | Behind the back wall / in the air duct | Requires complete defrosting and removal of panels |
| Indesit IB 18 | Mechanics | Outside the chamber (in the housing) | Access through the top cover unit |
| Indesit DS 320 | Mechanics | Inside, under the adjustment knob | Carefully remove the handle, unscrew the screws |
Using this table will allow you to immediately filter out inappropriate search options. For example, if you have a series model DF, it is useless to look for the handle inside the chamber - you need to prepare to disassemble the back wall.
What to do if the model is not found in the table?
Carefully inspect the insides of the refrigerator compartment. Look for wires coming from plastic elements. Often the thermostat is hidden where the wiring harness (harness) enters the chamber wall.
Diagnostics and signs of malfunction
Before changing the thermostat, make sure that it is the problem. There may be several symptoms of a malfunction. The most obvious one is that the refrigerator does not turn on at all, although the light is on and the buzzing of the network can be heard. This indicates that the circuit is broken and the command to start the compressor does not pass.
The second option is that the unit operates without stopping, freezing until a “fur coat” and ice form. This means that the thermostat contacts are “stuck” in a closed state, and it does not sense that the desired temperature has already been reached. The third sign is too frequent switching on and off, which indicates incorrect calibration or leakage of freon from the capillary.
For accurate diagnosis, use a multimeter. Put the device into dial mode and check the thermostat contacts. At room temperature, the contacts of the mechanical thermostat should be closed (beeping). If you place the sensitive element in the freezer for 15 minutes, the circuit should break.
- 🔌 No contact: The thermostat will not turn on the compressor.
- 🔄 Constant contact: The refrigerator does not turn off.
- ❄️ Ice on the capillary: a sign of freon leakage from the bellows.
Electronic sensors are checked by measuring resistance. It should change smoothly with temperature changes. A sharp jump or break indicates a failure of the sensor.
Common mistakes when replacing the regulator
The most common mistake is damage to the capillary tube during installation. Beginners often bend it or squeeze it with sharp metal edges. This is fatal to the system. The capillary should lie freely, without tension or sharp creases.
The second mistake is incorrect installation of the temperature-sensitive element. In mechanical models, the end of the capillary must be pressed tightly against the back wall of the evaporator or placed in a special sleeve. If it hangs in the air, the refrigerator will not work correctly, with large temperature changes.
The third error concerns electronic models: oxidation of contacts. When assembling, it would be a good idea to treat the connectors with contact spray. Moisture in the refrigerator is a constant companion, and poor contact will cause the new sensor to fail or give false readings.
⚠️ Attention: Do not use ordinary electrical tape to insulate the wires inside the refrigerator. In cold weather, the glue loses its properties and the tape comes off, which can lead to a short circuit. Use heat shrink.
It is also important to choose an analogue with identical characteristics. Thermostats are marked with letters and numbers (for example, TAM-133, K-59). Installing the wrong model will result in incorrect temperature conditions.
FAQ: Frequently Asked Questions
Is it possible to temporarily short-circuit the thermostat to make the refrigerator work?
Yes, technically you can connect the wires directly to check the operation of the compressor. However, leave the refrigerator in this mode on an ongoing basis absolutely not. The compressor will run continuously, which will lead to freezing of food, engine damage and huge energy consumption. This is only a temporary diagnostic measure.
Which thermostat is better to buy for Indesit: original or analogue?
Original spare parts Indesit are often relabeled products of well-known brands like Thermo or Ranco. Buying a high-quality analogue (for example, TAM-133 instead of K-59if they are compatible in capillary length and temperature) is often more profitable and is not inferior in quality. The main thing is to match the length of the capillary tube.
Why does the refrigerator not turn off after replacing the thermostat?
There may be several reasons: the thermostat is incorrectly selected (wrong temperature range), the capillary tube is poorly pressed to the wall, or there is not enough freon in the system. It is also worth checking the door seal - if it does not keep the cold, the thermostat will constantly “think” that the chamber is warm.
Where can I find the electrical diagram for my model?
Electrical diagrams are usually located on a sticker inside the refrigerator compartment (on the side wall or ceiling) or in the technical documentation. If the sticker has worn off, the diagram can be found on the Internet using the full model code (PNC) indicated on the label.
Do you need to defrost the refrigerator before replacing the mechanical thermostat?
To replace the mechanical thermostat located inside the chamber, complete defrosting is not always necessary if you are working quickly. However, for models No Frost and replacement of evaporator sensors, defrosting for 10-12 hours is strictly necessary, otherwise the plastic case or evaporator can be damaged during dismantling.