Refrigerators Indesit have proven themselves to be reliable equipment for many years, but even time-tested models have individual components that fail over time. One of the most vulnerable elements of the temperature control system is thermostat (or thermostat). It is he who is responsible for turning the compressor on and off, maintaining the necessary microclimate in the chambers.
If you notice that your unit has stopped freezing or, on the contrary, turns food into ice blocks, and the compressor works without stopping or does not turn on at all, the problem may lie in the sensor. Replacing this part is a task that can be done independently if you follow safety precautions and have the necessary tools at hand. In this article, we will analyze a step-by-step algorithm of actions, connection diagrams and diagnostic nuances.
Signs of a malfunctioning thermostat
Before you start disassembling the unit and searching for a spare part, you need to make sure of the diagnosis. Symptoms may be similar to a compressor failure or freon leak, so it is important to carry out a primary inspection. Owners often confuse thermostat failure with more serious problems, which leads to unnecessary expenses on calling a technician. diagnosis. Owners often confuse thermostat failure with more serious problems, which leads to unnecessary expenses on calling a repairman.
Pay attention to the nature of the motor's operation. If it hums continuously, not turning off even when low temperatures are reached, or remains silent for hours, allowing the food to defrost, this is a direct signal of a failure in the control circuit. It is also worth listening to the clicks: a characteristic sound should be present when switching modes.
There are several key signs indicating the need for replacement:
- ❄️ The compressor works without interruption, creating excess cold in the main chamber.
- 🔇 Complete absence of engine starting sounds when turning the handle regulator.
- 💧 The appearance of ice or a “snow coat” on the back wall even with minimal settings.
- 🌡️ The temperature in the chamber does not correspond to the set position of the regulator.
⚠️ Attention: If after defrosting the refrigerator in Within a day, the problem did not disappear, the probability of a malfunction of the thermostat is more than 80%.
Sometimes the situation is aggravated by oxidation of the contacts inside the device itself. In this case, even a mechanically serviceable sensor may not transmit a signal to the starting relay. Checking the integrity of the contacts requires testing with a multimeter, which is the next stage of diagnosis.
Preparation for repair and selection of tools
For successful replacement thermostat in the refrigerator Indesit no complex industrial equipment is required, but a basic set of home craftsman is required. It is important to prepare the workplace in advance by providing good lighting, since inside the unit it is often dark and cramped.
The main tool you will need is screwdrivers. Depending on the model and year of manufacture, both Phillips (PH1, PH2) and flat slotted screwdrivers may be required. For some modern models, bits like Torxmay be useful, so it is better to have them on hand in advance.
In addition, to check the functionality of the old and new parts, you will definitely need multimeter. Without it, it is difficult to guarantee that the replacement was successful and the new sensor is truly working. Also prepare a container for defrosting and a rag, since condensation may drip during dismantling.
List of necessary tools and materials:
- 🔧 Set of screwdrivers (phillips and flathead of different sizes).
- 🔌 Multimeter or continuity tester.
- 🧤 Gloves to protect your hands from sharp metal edges.
- 🧼 Cleaning agent for treating the chamber after repair.
Do not forget to completely disconnect the refrigerator from the power supply before starting any work. Remove the plug from the socket - this is a critical electrical safety rule, which, if ignored, may result in electric shock or short circuit.
☑️ Check readiness for repair
Removing the old thermostat
The process of removing the thermostat in refrigerators Indesit may vary slightly in depending on the design. In most models with a drip defrosting system, access to the sensor is through the top panel or by removing the back cover inside the chamber.
First you need to remove the protective casing, which houses the light lamp and the light button. It is usually secured with latches or one or two screws. By carefully prying up the plastic case with a flat-head screwdriver, you will gain access to the internal space where the capillary sensor is located capillary sensor.
The sensor tube (capillary) is very thin and fragile. It runs along the inner wall of the chamber and is secured with special clips. When removing the old thermostat, proceed with extreme caution so as not to damage this tube and not to break the tightness of the system.
⚠️ Attention: Never pull the capillary tube with force. It may burst, which will lead to a refrigerant leak and costly repairs of the entire system.
After freeing the tube from its fasteners, disconnect the electrical wires. It is advisable to photograph or sketch the connection diagram before doing this, so that when installing a new element you do not mix up the contacts. Typically, the terminals are color-coded or numbered.
To make it easier to remove the thermostat unit itself, you may need to remove the entire top cover of the refrigerator. It is secured with several screws around the perimeter and sometimes with hidden latches in the area of the door hinges. By removing the cover, you will have full access to the fastening unit.
Connection diagram and contact marking
Correct connection of the thermostat is the key to stable operation of the compressor. An error in connecting the wires can result in the refrigerator not turning on or, worse, a short circuit. On the body of most thermostats Indesit (analogs are often used Tam, K59, K50) there are terminal markings.
The standard connection diagram usually includes three main contacts. The first contact is responsible for supplying voltage from the network, the second goes to the compressor, and the third (if there is one) closes the circuit to the alarm lamp or fan. In two-contact models, everything is simpler: the circuit breaks between two terminals.
Below is a table with the most common designations of contacts on thermostats installed in Indesit equipment:
| Designation on the terminal | Wire color (often) | Purpose |
|---|---|---|
| 3 (or L) | Brown / Red | Phase input (power) |
| 4 (or 1) | Black / White | Output to compressor |
| 6 (or 2) | Yellow / Green | Output to indicator/fan |
| Ground | Yellow-green | Protective grounding of the case |
When replacing a part, focus not only on the color of the wires, which may fade or be changed by previous masters, but also on the logical circuit. The wire coming from the refrigerator plug should go to the thermostat input, and the wire going to the start relay should go to the output.
If you are using a universal analogue that does not completely match the location of the terminals with the original, use multimeter in the dialing mode. Find a pair of contacts that close when the sensor cools (you can hold it in your hand or apply it to an ice cube). It is this pair that needs to be included in the compressor power supply circuit.
What to do if the color marking does not match the table?
If the colors of the wires in your refrigerator differ from the standard ones, do not rely on them blindly. Use the multimeter in resistance mode. Find the wire coming from the power plug (it will “ring” constantly with one of the thermostat contacts). The second wire, which should only close when cooling, will go to the compressor. The third (if any) is for additional devices. Always check the circuit before applying voltage.
Installing a new thermostat and calibration
After the old element has been removed and the circuit has been studied, you can begin installing a new thermostat. Installation is carried out in the reverse order of removal. First of all, secure the sensor block itself in the seat using standard fasteners.
Pay special attention to laying the capillary tube. It should lie in the same groove or be attached with the same clips as the original one. The length of the tube may differ among analogues: if it is too long, carefully roll the excess into a ring, without bending or squeezing the metal. If it is short, use a special extension lug, if it was included in the kit.
Connect the wires according to the previously recorded diagram or markings on the case. Make sure the contacts are tight and not loose. If necessary, tighten them with pliers, but without excessive force, so as not to break the plastic terminal insulators.
After a successful test run, assemble all the plastic elements of the refrigerator interior. Reinstall the lamp shade, shelves and drawers. Now you need to calibrate. Rotate the knob to adjust the temperature. Typically, the middle position corresponds to +4...+5°C in the main chamber.
Complete stabilization of the temperature regime can take from 6 to 12 hours. During this period, you should not load the chamber with products to allow the unit to enter the operating cycle without unnecessary thermal load.
Common mistakes when replacing yourself
Independent repair is always a risk of making a mistake, especially if you are encountering a specific model for the first time. Analysis of common errors helps to avoid situations when a new part fails immediately after installation or the refrigerator begins to work incorrectly.
One of the common mistakes is ignoring the length of the capillary tube. If it touches hot parts of the compressor or drain system, the thermostat will receive false high temperature signals, causing the compressor to run continuously. This will lead to rapid wear of the motor.
Another error is poor contact in the terminals. If you simply put the terminals on the pins without checking the tightness, sparking may occur at the contact point. Over time, this will lead to burnt contacts and repeated failure. Always check the reliability of the connection.
- 🚫 Using a thermostat with an inappropriate temperature range (for example, for a freezer instead of the main chamber).
- 🚫 Damage to wire insulation due to careless installation.
- 🚫 Forgetfulness in connecting grounding, which reduces operational safety.
⚠️ Attention: Technical characteristics of thermostats may vary depending on the specific series of Indesit refrigerators. Before purchasing a new part, check the original number on the body of the old device or consult with the spare parts seller, indicating the exact model of your refrigerator.
It is also worth remembering that if after replacing the thermostat the problem is not solved, perhaps the fault lies deeper. This could be a freon leak, a malfunction of the start relay or the compressor itself. In such cases, it is better to turn to a professional diagnostician.
Questions and answers (FAQ)
Is it possible to install thermostat from another refrigerator model?
Yes, you can often use analogues if they are suitable in size, capillary tube length and temperature range. However, it is important that the thread of the rod and the type of fastening match. Universal models often require modification of the installation location.
Why does the refrigerator freeze more after replacing the thermostat?
This may mean that a thermostat with a lower shutdown threshold is installed, or the capillary tube is not immersed deep enough in the chamber (or is in poor contact with the evaporator). Also check if the tube is kinked.
How to check a new thermostat before installation?
Use a multimeter in dial mode. At room temperature the contacts should be closed (for most models). If you put the sensor in the freezer for 10-15 minutes, the circuit should break (open) with a characteristic click.
Is it necessary to defrost the refrigerator before replacing?
Yes, complete defrosting is required. This will not only make access to the components easier, but will also protect you from water getting on the electrical contacts, and will also allow you to carefully work with plastic elements that become fragile in the cold.