If your Indesit refrigerator stopped freezing or, conversely, began to turn food into ice blocks, it is most likely to blame thermostat. This small but critical element is responsible for maintaining the desired temperature inside the chambers. When it fails, the compressor either runs continuously, trying to achieve non-existent cold, or does not turn on at all, leaving food at room temperature.
Replacing this component is a task that can be done yourself if you have basic skills with tools and follow safety precautions. You do not have to call a technician to restore the unit to working order, but it is important to clearly understand the structure of your particular one. In this article, we will analyze in detail the process of diagnosing and installing a new part so that you can avoid common mistakes. Indesit models. In this article, we will take a detailed look at the process of diagnosing and installing a new part so that you can avoid common mistakes.
Before starting work, you need disconnect power refrigeration equipment. Tampering with live electrical components is strictly prohibited and may result in serious injury or damage to the electronics. Unplug the electrical outlet and move the appliance away from the wall, giving yourself clear access to the back wall and interior space.
⚠️ Attention: Do not attempt to repair the refrigerator while it is connected to the electrical outlet. Even a short-term shorting of the thermostat contacts under voltage can damage the compressor or start relay.
ℹ️ Information: The design of thermostats may vary slightly depending on the year of manufacture of your model. Always check the markings of the new part with the one installed on the old regulator to avoid compatibility problems.
Signs of a malfunctioning thermostat
You can understand that thermostat it is out of order by a number of characteristic symptoms that appear in the operation of the unit. Most often, users notice that the refrigerator hums continuously, not turning off even when the food is clearly frozen. This indicates that the contacts inside the sensor are “stuck” in a closed state, and the signal to turn off the compressor is not received.
In another situation, you can observe complete silence. The compressor is silent, the light in the chamber is on, but there is no cold. This means that the circuit is broken and the thermostat does not give the command to start the motor. It is also worth paying attention to the formation of a “fur coat” or ice in the refrigerator compartment, which should not normally be the case, especially on the back wall.
- ❄️ The compressor works non-stop, creating excess cold or ice.
- 🔇 The engine is silent, the temperature inside the chamber rises to room temperature.
- 💡 The light is on, but the refrigerator does not respond to turning the control knob.
- 🧊 The appearance of puddles under the unit due to melting food or defrosting of the evaporator.
Sometimes the cause may not be the sensor itself, but a freon leak, but if you are convinced of the integrity of the circuit, then replacing the thermostat is the first logical step. Before purchasing a new part, it is recommended to carry out a simple check: with the compressor running, turn the regulator knob counterclockwise until it clicks. If there is no click and the motor does not stop, the part is faulty.
Required tools and part selection
For a successful replacement, you will need a minimum set of tools, which can be found in the garage of most home craftsmen. The main tool will be phillips screwdriver, since this is what secures most of the panels in refrigerators Indesit. You may also need a flat-head screwdriver to carefully pry up the plastic latches.
The most important step is selecting the right one thermostat. These devices are not universal: they differ in the length of the capillary tube, temperature range of operation and connection method. An incorrectly selected part will lead to incorrect operation: either the refrigerator will often turn on and off, or it will not be able to reach the desired temperature.
To avoid making a mistake with your choice, remove the old regulator and look at its markings. It is usually applied to a metal body. Look for codes starting with K (for example, K50, K59) or TAM. The length of the capillary tube is also important: if the new tube is too long, it will have to be carefully laid in specially designated channels without bending.
Removing the old thermostat
The process of removing the faulty element depends on where it is located in your model. In most refrigerators Indesit with manual defrosting, the thermostat is located inside the refrigerator compartment, under a plastic cover or directly on the body. In No Frost models, it can be hidden behind the control panel.
First you need to remove all interfering elements: shelves, drawers and decorative trims. Be careful with plastic, as it becomes brittle in the cold and breaks easily if not handled carefully. After gaining access to the thermostat, disconnect the mode switch knob by simply pulling it towards you.
Next, unscrew the fastening screws and carefully remove the sensor housing. Pay special attention capillary tube. It is very thin and easily damaged. It should not be pulled sharply or bent at an acute angle, since breaking the tightness of the tube will make the new thermostat inoperative immediately after installation.
☑️ Removing the thermostat
When the body is removed, take a photo of the wiring diagram. This is a critical point, since the color coding of the wires may vary from manufacturer to manufacturer. Remember or write down which wire went to which terminal. After this, you can disconnect the terminals and completely remove the old device.
⚠️ Attention: The capillary tube is filled with a sensitive gas or liquid. If you accidentally damage it (puncture or break), the refrigerant will evaporate and the thermostat will stop responding to temperature changes. Treat it like an egg.
Connection diagram and installation of a new regulator
Installation of a new one thermostat is done in the reverse order of dismantling. First you need to correctly connect the electrical wires to the terminals of the new part. This is where the photograph taken at the previous stage will come in handy. Usually the wires are color-coded, but you cannot rely on color alone.
The table below shows typical contact markings for the most common thermostats installed in equipment Indesit. Please note that the numbering may vary depending on the manufacturer of the relay itself (Danfoss, Ranco, Klixon).
| Terminal marking | Contact function | Wire color (typical) | Note |
|---|---|---|---|
| 3 - 4 | Power input | Red / Brown | Main circuit |
| 3 - 6 | Compressor output | Black / Green | Closes when turned on |
| 3 - L | Indicator / Lamp | Yellow / White | Not in all models |
| Grounding | Protective circuit | Yellow-green | Attached to the body |
After connecting the wires, carefully insert the capillary tube into the mounting hole. In refrigerators with a drip defrost system, the end of the tube is often attached to the evaporator using a special clamp. Make sure the tube is tight, but not too tight.
Secure the thermostat housing with screws and replace the plastic cover. Be sure to return the temperature control knob with the marks aligned. Now you can proceed to final assembly and testing.
What to do if the wires do not fit in length?
If the new terminals are located further than the old ones, do not under any circumstances pull the wires. Extend them with pieces of copper wire of the same cross-section, carefully insulating the twisted areas with heat shrink. This is safer than the risk of breaking the standard wiring.
Setting up and testing operation
After everything is assembled, turn on the refrigerator. In the first minutes you will hear a characteristic click - this is the compressor starting. If there is no startup sound, check the wiring diagram again. It is possible that the contacts are not fully seated on the terminals or the polarity is reversed (although for alternating current this is less critical, it is important for the control circuit).
Let the unit run in test mode for about 30-40 minutes. During this time, the temperature inside the chamber should decrease noticeably. Turn the thermostat knob to the “minimum” position (usually number 1). After some time the compressor should turn off. If this does not happen, the new one may be defective or not suitable for the temperature range. thermostat defective or not suitable for the temperature range.
Check the tightness of the capillary tube installation. There should be no drafts at the exit point from the housing, otherwise the sensor will respond to the air temperature in the room, and not inside the refrigerator. If necessary, use caulk or plasticine to seal the hole.
Frequent errors during self-repair
Independent repair is often accompanied by typical errors that can negate all efforts. One of the most common is ignoring the length of the capillary tube. If the tube is too long, they try to stuff it anywhere, forming loops and creases. This disrupts the circulation of the working fluid inside the tube.
Another error is poor contact in the terminals. If the wire is not seated tightly, heating and sparking will begin to occur at the junction. Over time, the plastic will melt and cause a short circuit. Always check that the wires are securely fastened, if necessary, tightening the terminals with pliers (after turning off the power!).
- 🔌 Forgot to ground the thermostat housing (if provided for by the design).
- 🌡️ Installed a regulator with an inappropriate temperature response threshold.
- 🧊 The insulation of the capillary tube was damaged during installation.
- 🔧 The screws were not fully tightened, which caused a backlash in the sensor.
Also, users often confuse the thermostat with the defrost sensor in No Frost systems. These are different devices with different operating principles. Replacing one with another is impossible and will lead to a breakdown of the control system.
Is it possible to use a thermostat from another refrigerator model?
You can use an analogue, but only if the basic parameters match: temperature range, capillary tube length and type of contacts. There are no universal solutions, so always check the labeling. Installing an unsuitable sensor can lead to defrosting of food or freezing of the evaporator.
Why, after replacement, does the refrigerator not work as well as before?
This may be due to incorrect settings or a defective new part. It is also possible that the cause of the malfunction was not only the thermostat, but also a freon leak or a compressor malfunction. Let the equipment sit for several hours and check the cyclic operation.
Do you need to defrost the refrigerator before replacing the thermostat?
Yes, complete defrosting is required. Firstly, this is required for your safety when working with electrical appliances. Secondly, in a defrosted state it is easier to get to the fasteners and the evaporator without damaging the plastic elements with ice.
How to understand that the thermostat is stuck and needs to be changed?
Perform a simple test: with the compressor running, unscrew the thermostat knob to the “0” or “Off” position. If the compressor does not stop after 1-2 minutes, it means that the contacts are stuck in a closed state and the thermostat requires replacement.