The situation when the refrigerator Indesit stops freezing or, conversely, turns food into ice blocks, most often indicates a failure in the temperature control system. Thermoregulator (or thermostat) is the same sensor that reads the temperature inside the chamber and sends a signal to the compressor to turn on or off. If this mechanism fails, the device works chaotically, consuming excess electricity and threatening the safety of your supplies.
Replacing this part independently is within the capabilities of a home craftsman with basic skills in handling tools. However, it is worth understanding that the process requires care: it is necessary not only to correctly dismantle the old element, but also to correctly configure the new one so that the compressor operating cycle meets the requirements refrigerator compartment. In this article we will analyze all stages of work, from diagnostics to final inspection.
Before you begin disassembling, make sure that you have purchased exactly the thermostat model that is suitable for your modification. Indesit. Different series of refrigerators can be equipped with sensors with different response characteristics and capillary tube lengths. An error in choosing a component will lead to the fact that the equipment will not return to operating mode even after installation.
Diagnostics of a thermostat malfunction
It is possible to understand that the culprit of the problem is thermostatby a number of indirect signs. If the refrigerator compressor Indesit hums continuously, not turning off even when it is clearly very cold inside, this is a sure sign of sticking contacts or loss of sensitivity of the sensor. In the opposite situation, when the motor is silent and the chamber is warm, the thermostat may simply not close the circuit.
There is a simple method of initial testing that does not require complex instruments. It is necessary to unplug the refrigerator, defrost it and wipe it dry. After this, turn on the unit and listen: if the compressor starts working, but after 10-15 minutes (when it should be already cold) does not turn off, and frost appears on the walls, a breakdown is likely.
- 🔍 The compressor works without interruptions, creating excess cold.
- 🔍 The motor does not turn on at all, although the light is on lighting.
- 🔍 The temperature in the chambers fluctuates greatly without changing the settings.
- 🔍 A “coat” of ice forms on the back wall even at the minimum setting.
For more accurate diagnostics, professionals use a multimeter. When checking the contacts, a working thermostat at room temperature should show “zero” (closed circuit), and when cooled, open it. If the device shows a break or the resistance does not change, the part requires replacement.
Why do thermostats fail?
The main reason is the natural wear of the bimetallic plate or bellows. Over time, the metal “gets tired” and stops responding to temperature changes. Mechanical damage to the capillary tube is also possible due to inaccurate defrosting or moisture entering the sensor body, causing corrosion of the contacts.
Necessary tools and preparation
To successfully carry out the work, you will need a minimum set of tools that can be found in the arsenal of any home craftsman. The main requirement is safety and accuracy, since we work with electrical appliances and fragile elements of the cooling system.
First of all, you will need a Phillips and flathead screwdriver to dismantle the panels and remove the terminals. A flat-head screwdriver is often needed to carefully pry up plastic latches, which can be quite tight on equipment. Also prepare pliers for working with wires and, possibly, side cutters. Indesit can be quite tight. Also have pliers for working with wires and, possibly, side cutters.
| Tool | Purpose | Importance |
|---|---|---|
| Phillips screwdriver | Removing housing screws | High |
| Flat screwdriver | Removing latches, terminals | High |
| Multimeter | Checking the circuit | Medium |
| Hair dryer | Ice defrosting | Low |
It is critically important to completely de-energize the refrigerator before starting any work Indesit. Unplug the cord from the outlet. This will protect you from electric shock and prevent a short circuit when manipulating the electrical contacts of the thermostat.
Access to the thermostat in different models
The location of the thermostat in refrigerators Indesit depends on the type of control and the year of manufacture of the model. In classic two-chamber refrigerators with mechanical control, the sensor is most often located inside the refrigerator compartment, under a plastic panel or directly in the light bulb housing.
In models with a system No Frost or electronic control, access may be more difficult. Sometimes the thermostat (or its analogue - a defrost sensor) is hidden behind the back wall of the chamber or in a niche above the door. Carefully inspect the interior of the chamber: look for a plastic box with an adjustment knob or wires going into the wall.
If the adjustment knob is located outside on the “forehead” of the refrigerator, then the thermostat itself is usually located in a special compartment above the upper chamber or behind a decorative strip. To gain access, you will need to remove the top cover of the housing or the lamp shade. Be careful with plastic clips - they can be fragile from the cold.
⚠️ Attention: Some modern models Indesit instead of a classic thermostat with a capillary tube, electronic sensors (thermistors) can be used. They have a different design and cannot be replaced according to the mechanical scheme described below. Make sure that you have a mechanical regulator.
☑️ Check before disassembly
The process of dismantling the old thermostat
After you have reached the unit, carefully inspect the fasteners. The thermostat in refrigerators Indesit is usually fixed with two screws or plastic latches. Carefully unscrew them, trying not to drop the fastener deep into the case, where it will be difficult to reach.
The next step is to disconnect the wires. Before removing the terminals, it is strongly recommended to take a photo of the connection diagram or mark the wires with a marker. The color scheme may vary, and mixing up the contacts means creating the risk of a short circuit. Usually these are 2 or 3 wires going to the contact group.
The most delicate part is extraction capillary tube. It passes through a hole in the chamber wall and is fixed inside to the evaporator. The tube is very thin and fragile, made of copper. You need to pull it out smoothly, without jerking. If it is wound around the evaporator, carefully unwind the turns without bending the metal at an acute angle.
- 📸 Take a photo of the connection of the wires before disconnection.
- 🔧 Unscrew the screws securing the housing thermostat.
- ❄️ Carefully pull the sensitive tube out of the chamber.
- 🧹 Clean the seat from dust and ice.
If the tube is stuck to the ice, do not use force under any circumstances. Use a hair dryer on low power or warm water (in a syringe without a needle) to defrost the entry point of the tube into the chamber. A sudden movement can lead to depressurization of the system, which will turn a simple repair into an expensive refill with freon.
Installation and configuration of a new sensor
Installation of a new thermostat is carried out in the reverse order of dismantling. Insert the capillary tube into the hole until it stops. It is important that the sensitive bellows (extension at the end of the tube) is in close contact with the evaporator or is in a special seat provided by the design Indesit.
Fix the thermostat housing in its original place with screws. Connect the wires according to the photos or markings taken earlier. Make sure the terminals are tight and not loose. Poor contact will lead to sparking and rapid failure of the new part.
After assembly, do not rush to load the products. Turn on the empty refrigerator and let it run for a few hours. Check if the compressor switches off when the temperature reaches low. If the operating cycle is broken (too short or too long), additional adjustment may be required with a screw located on the thermostat housing (usually closed with a seal or plastic plug).
⚠️ Attention: The adjusting screw on the thermostat is designed to calibrate the temperature range. Do not twist it unless necessary and without understanding how it works. Shifting the factory settings can cause the refrigerator to stop turning off completely.
Frequent errors during replacement
One of the most common errors is damage to the capillary tube during installation. Copper is soft, and accidental pressure with pliers or a fingernail can create a microcrack. Over time, freon will come out through it, and the refrigerator will stop freezing. Work with the tube only by its insulation or special thickenings.
Also, craftsmen often ignore the need for complete defrosting before starting work. An attempt to replace a thermostat in a “warm” but not completely defrosted refrigerator may result in moisture entering the electrical contacts immediately after switching on, which will cause corrosion or breakdown.
- 🚫 Using the wrong thermostat model (different tube lengths).
- 🚫 Bend the capillary tube at an angle of 90 degrees.
- 🚫 Poor cleaning of contacts or weak fixation of terminals.
- 🚫 Ignoring checking the door seal after repair.
Another mistake is installing a thermostat without checking the door seal. If the door does not close tightly, warm air enters the chamber, and a new, working thermostat will constantly drive the compressor, trying to compensate for heat loss. This will create a false impression that the part is defective.
⚠️ Attention: The characteristics of thermostats may vary depending on the specific series of refrigerators Indesit. Always check the markings on the new part with the number indicated in the technical documentation or on the old sealed part, if the marking is readable.
Checking functionality after replacement
The final stage is testing. After installing the thermostat and turning on the refrigerator, it should work. Let him get into the mode (usually this takes from 2 to 5 hours). At this time, do not open the door frequently so as not to disturb the temperature balance.
Check the cyclic operation. The compressor must turn on, cool the chamber to the set temperature, then turn off and “rest” until the temperature rises. Operating and idle time depends on the ambient temperature (temperature in the room) and the load of the chambers.
Use a thermometer placed in a glass of water to accurately check the temperature in the refrigerator compartment. It should be within +2...+5°C. If the temperature is significantly higher or lower, you may need to recalibrate or check the tightness of the system.
How long should the refrigerator operate after replacement?
The first cycle may be longer than usual - up to 40 minutes of operation and 20 minutes of inactivity. Complete stabilization of the temperature regime and return to standard cycles take about 12-24 hours of continuous operation.
Is it possible to replace the thermostat without defrosting the refrigerator completely?
Technically it is possible if you act very quickly and carefully, but it is highly not recommended. Moisture remaining in the form of frost on the evaporator can flow into the capillary tube attachment or onto the electrical contacts, which will lead to corrosion or a short circuit immediately after switching on.
Why does the new thermostat click, but the compressor does not start?
This may indicate a problem not with the thermostat, but with the start relay compressor or the motor itself. It is also worth checking whether the terminals on the thermostat contacts are tightly seated. If the contact is bad, the current does not pass, despite the click of the mechanism.
Does it need to evacuate the system when replacing the thermostat?
No, if you are changing only the electrical part (thermostat) and have not damaged the capillary tube or the freon circulation system. Evacuation and charging are required only when the refrigerant circuit is depressurized.
Where can I find the thermostat markings for Indesit?
The markings are usually applied to the metal body of the thermostat itself. To see it, you often have to remove the protective plastic casing or remove the assembly from its seat. Look for codes like K59, TAM, or numbers like 1234567890.