A sudden cessation of cooling or, conversely, endless operation of the compressor often indicates a failure of the temperature control system. In brand refrigerators Indesit a thermostat is responsible for this process, which may stop responding correctly to changes in the microclimate inside the chambers. If you notice that food has begun to deteriorate faster than usual or a giant coat of ice has formed on the back wall, most likely it’s time to replace this element.
Independent repair requires care and compliance with safety precautions, but it is quite within the capabilities of a person who knows how to hold a screwdriver. Thermoregulator is a mechanical or electronic device that opens the compressor power circuit when it reaches specified values. In this article we will analyze the dismantling process in detail, paying special attention to the nuances characteristic of the Italian assembly and its localizations.
Before starting disassembly, you need to understand that different models Indesit may have different designs of the control unit. In some cases it is hidden behind a decorative panel, in others it is accessible immediately after removing the lampshade. It is important to prepare the workplace in advance and make sure that the unit is disconnected from the power supply, since work will be carried out in close proximity to live parts.
Diagnostics of a thermostat malfunction
The first step before starting physical work should always be an accurate diagnosis. Do not rush to disassemble the equipment if you are not sure that the problem is in the temperature controller. Symptoms of a thermostat malfunction are often confused with a broken start relay or a freon leak. The main sign of failure is the absence of a characteristic click when turning the handle or complete ignoring of changes in the position of the regulator.
There is a simple method of initial testing that does not require complex equipment. If the compressor is running non-stop, try freezing the sensor by placing it in the freezer for a short time (after disconnecting it). If after cooling the circuit does not open, then thermostat it definitely requires replacement. If the refrigerator does not turn on at all, the problem may lie in broken contacts inside the regulator itself.
⚠️ Attention: If after defrosting for a day and turning it on again the situation has not changed, perhaps the problem lies deeper - in the refrigerant circulation system or the electronic control module.
For owners of models with the system No Frost diagnostics may be complicated by the presence of additional defrost sensors. However, classic thermostats are also present in such systems and are responsible for the basic logic for turning on the motor. It is important to distinguish between mechanical failure of the rod and electrical breakdown. Visual inspection of contacts often helps to identify traces of carbon deposits or oxidation that interfere with normal current conduction.
Necessary tools and preparation
High-quality repairs are impossible without suitable tools. To dismantle the thermostat in refrigerators Indesit you will need a minimum DIY kit, however, the absence of even one necessary screwdriver can significantly delay the process or lead to damage to the plastic fasteners. Collect everything you need in one place in advance so as not to be distracted while working.
The main list of tools includes Phillips and flat-head screwdrivers, as well as pliers with thin jaws. A flat-head screwdriver is often needed to carefully pry up the latches of plastic panels, which are made quite fragile by Indesit. Pliers are useful for removing terminals from contacts if they are too tight and cannot be removed with your fingers.
- 🔧 A set of screwdrivers (phillips PH1, PH2 and flat) for the housing screws.
- 🔌 Multimeter or tester for checking circuit integrity.
- 🧤 Dielectric gloves for safety when working with electrical equipment.
- 📸 Smartphone for photographing the wiring diagram.
Special attention should be paid to lighting the work area. The insides of the refrigerator compartment are dark, and in order not to damage capillary tubeit is necessary to see every movement. Using a headlamp or a powerful lamp will make the task much easier. It is also recommended to have electrical tape or heat shrink on hand in case you have to extend the wires.
☑️ Preparation for repair
Access to the thermostat in models with a weeping evaporator
In classic single-chamber refrigerators and two-chamber models with a “weeping” evaporator With a defrosting system, the thermostat is most often located inside the refrigerator compartment. Access to it is usually closed with a decorative overlay or combined with the lighting control unit. The removal process begins with the dismantling of all interfering elements on the top wall of the chamber.
First you need to remove the lampshade. Depending on the model Indesit, it can be held on a screw or fixed with latches. Carefully pry the plastic with a flat screwdriver and remove the cover. There is often a screw underneath that holds the control panel in place. After unscrewing it, the panel is easily moved down or removed completely, providing access to the mechanism.
The thermostat itself is a box with a long sensitive tube coming out of it. This tube is fixed in a special hole and pressed against the evaporator. Capillary it is very thin and easily damaged, so it is strictly forbidden to pull on it. First, the fastenings of the regulator box itself are released, and only then the temperature sensor is carefully removed.
Nuances of attaching the tube
In some models, the tube can be glued to the evaporator with thermally conductive glue. Do not tear it by force - heat the joint with a hairdryer at a minimum temperature to soften the glue.
It is important to remember the order in which the wires are connected. Even if you take a photo, it would be a good idea to mark each wire with a marker according to the diagram. An incorrect connection may result in a short circuit or the compressor not operating properly. In older models, the wires may have been mixed up by previous technicians, so checking with the manual is mandatory.
Replacing the thermostat in No Frost refrigerators
In systems No Frost the design of the temperature control unit may differ. Here the thermostat is often located outside the working chamber or integrated into a common control unit located on the top of the refrigerator body. Dismantling in this case requires removing the top cover of the unit, which is a more labor-intensive process.
To access the top of the refrigerator, you need to move it away from the wall and remove the back panel if access from above is closed. In some modifications Indesit it is enough to simply remove the decorative strip from the front from above. The thermostat in such models is attached to the body with metal brackets or plastic holders. The sensing tube passes through the entire body to the evaporator in the freezer compartment.
The main difficulty when working with No Frost lies in the length and location of the capillary tube. It can be wound in a spiral or secured along the walls of the channel. When removing the old element, you must act extremely carefully so as not to snag or damage adjacent communications. The new thermostat should have a similar capillary length.
After installing a new element, it is necessary to check the tightness of the tube passing through the wall. If there was a seal there, it needs to be restored. In systems with automation Indesit a special sealant is often used that prevents warm air from entering the insulation. Ignoring this step may lead to the formation of condensation inside the case.
Compatibility and markings table
When purchasing a new spare part, it is extremely important to choose the right analogue. Thermostats are marked according to international standards, and for refrigerators Indesit devices of certain series are most often suitable. The wrong temperature range will result in either a permanent freezer or a warm chamber.
Below is a table of the main characteristics that you should pay attention to when choosing a replacement. Pay attention to the length of the capillary tube and the on/off temperature of the contacts.
| Marking (Series) | On temperature (°C) | Off temperature (°C) | Capillary length (cm) |
|---|---|---|---|
| TAM-133 | -12...-14 | -20...-24 | 75-90 |
| TAM-125 | -10...-12 | -18...-22 | 60-75 |
| K-59 | -10...-12 | -23...-26 | 70-85 |
| T-110 | -10...-12 | -22...-25 | 65-80 |
When choosing an analogue, it is allowed to use thermostats with a slightly wider range, but with mandatory observance of the lower shutdown threshold. If you install a regulator that turns off the compressor at -10°C instead of -18°C, the food in the freezer will begin to melt. Therefore original code spare parts or its direct analogue are the best choice.
⚠️ Attention: The technical characteristics of thermostats may vary slightly depending on the year of manufacture of the refrigerator. Always check the parameters (especially the length of the capillary) with your old part before purchasing.
Assembly and initial startup
After successful installation of the new thermostat, the reassembly stage begins. Here it is important not only to tighten the screws, but also to correctly position the sensitive tube. It should fit snugly on the evaporator in the same place where the original part was attached. Often a special bracket or clip is used for fixation.
Connect the wires according to the photographs or diagram taken earlier. Make sure the terminals are tight and not loose. If the contacts are oxidized, sand them with fine sandpaper before putting them on. Assemble the control panel and install the lamp shade, checking whether the light comes on when the door is opened.
Now you can turn on the refrigerator. The first launch may take longer than usual. The compressor needs to build up pressure and cool the chambers to the specified values. Do not open the doors during the first hour of operation to allow the system to return to operating mode.
Check the operation of the device: turn the regulator knob. You should hear a clicking sound and the compressor should either start or stop depending on the position. If the operating cycle is observed and the temperature in the chambers stabilizes within 4-6 hours, the repair can be considered successful.
Frequently asked questions (FAQ)
Is it possible to temporarily short-circuit the thermostat wires to make the refrigerator work?
Yes, this is possible for emergency food preservation, but only how temporary measure. Shorting the wires (usually brown and black/green) turns the compressor into continuous operation. This will lead to severe hypothermia and possible freezing, and will also increase energy consumption. Long-term operation in this mode is dangerous for the motor.
Why does the new thermostat click, but the compressor does not start?
This may indicate a malfunction of the start relay, the compressor itself, or an open circuit after the thermostat. It is also possible that the new thermostat is defective and does not close the contacts internally, despite the external click. It is necessary to test the circuit with a multimeter at the moment of click.
Do you need to release freon to replace the thermostat?
No, the thermostat is the electrical component that controls the circuit. The sensitive tube is filled with its own reagent gas, sealed and not connected to the main circuit of the refrigerator. Opening the cooling system to replace the thermostat is not required.
How can you tell if the thermostat capillary is damaged?
If the tube shows traces of oil, dents, or is broken, such a thermostat will not work. The reagent gas has evaporated and there is not enough pressure to open/close the contacts. A visually intact but not working part is also considered damaged.