Sudden shutdown of the refrigerator Indesit and defrosting food is always stressful, requiring immediate intervention. Most often, the cause of failure is thermostat, which stops sending a signal to the compressor to turn on. Replacing this element is one of the most common procedures in the repair of household appliances, which can be done independently if you have basic skills.
Before starting disassembly, you need to make sure that the problem lies in the temperature controller, and not in the start relay or the motor itself. Thermostat responsible for maintaining a given temperature regime inside the chambers, opening and closing the electrical circuit. If the refrigerator hums but does not cool, or vice versa - it works without stopping, most likely the sensor will need to be replaced.
In this article we will analyze in detail the process of diagnosing and replacing the thermostat in refrigerators Indesit various series. You will learn how to choose the right analogue, safely dismantle the old device and set up a new operating mode. Compliance with safety precautions and sequence of actions will extend the life of your equipment.
Diagnostics of thermostat malfunction
The first sign of failure thermostat is a violation of the temperature regime. If you notice that the refrigerator compartment is too warm, although the control knob is turned to maximum, or the food in the chamber is freezing, turning into ice, this is an alarming signal. It is also worth paying attention to the operating mode of the compressor: if it is either silent or hums continuously, ignoring the position of the switch knob.
For more accurate diagnostics, you can use a multimeter. It is necessary to get to the contacts of the thermostat and “ring” them in different positions of the handle. In normal condition, when you turn the handle, a characteristic click should be heard, indicating that the contacts are closing or opening. Lack of response or constant lack of contact indicates a breakdown.
⚠️ Attention: Before starting any diagnostic and repair work, be sure to disconnect the refrigerator Indesit from the electrical network. Working with live electrical wiring is dangerous and can lead to a short circuit.
There are several indirect signs that help identify the problem before removing parts. For example, if when the compressor is forced on (bypassing the thermostat), the refrigerator begins to freeze normally, then the reason is almost certainly in the sensor. However, if even with a direct connection the motor does not start, the problem may be deeper.
Preparing tools and selecting a new part
For a successful replacement thermostat you will need a minimum set of tools, which is usually found in every home. It is important to prepare your work area in advance so that you don’t have to look for a screwdriver or pliers during the process. Refrigerators Indesit often use specific screws, so make sure you have the appropriate Phillips screwdriver.
- 🔧 Phillips and flathead screwdrivers for removing panels and terminals.
- 🔪 Knife or a thin awl for carefully removing plastic plugs.
- 🔦 Flashlight for illuminating the interior of the refrigerator compartment.
- 🧤 Pliers for clamping contacts (use carefully).
Choosing a new part is a critical step. Thermal relays for Indesit may differ in the length of the capillary tube, the type of rod and the location of the contacts. There is always a marking on the body of the old device, for example, TAM 133 or K 59. It is these codes that you need to look for a replacement.
Pay attention to the length of the sensitive tube. If the new part has a tube shorter than required, the refrigerator may incorrectly read the temperature. The length of the capillary tube should be equal to or greater than the length of the original, the excess can be carefully twisted, but not bent.
Where can I find the thermostat markings?
The marking is usually applied to the metal body of the device or on the plastic regulator knob. Look for a code starting with the letters K, TAM, T or R. Also, the part number may be indicated in the technical documentation of the refrigerator.
Removing the old thermostat
The process of removing the thermostat in refrigerators Indesit depends on the specific model, but the general algorithm of actions is similar. In most cases, the regulator is located inside the refrigerator compartment, under a plastic cover or directly in the temperature control unit.
First you need to remove the switch handle. It can simply pull towards itself or have a hidden fixing screw under a decorative plug. After removing the handle, access to the fastening elements of the block itself opens. Carefully unscrew the screws and remove the assembly out.
Pay special attention to removing the capillary tube. It is very thin and fragile, it passes through the seal of the door or chamber wall. Capillary You cannot pull it sharply or bend it at an acute angle, since there is gas or liquid inside, and breaking the seal will damage the device. Smoothly pull out the tube, watching its trajectory.
☑️ Removing the thermostat
When the housing is removed, disconnect the electrical wires. It is recommended to take a photo of the connection diagram before doing this or mark the wires with a marker so as not to confuse them when installing a new element. In some models Indesit the wires may be soldered, then you will need to clean the contacts and prepare them for connection to the new thermostat.
Installation and connection of the new thermostat
Installation of the new thermostat is performed in the reverse order. First you need to carefully insert the capillary tube in place of the old one. It must lie in the same groove or groove as the original one in order to correctly read the temperature of the evaporator.
When connecting the wires, be guided by the marks made earlier or the photograph. The color coding of wires in refrigerators Indesit is usually standard, but it is better to double-check. The contacts must be tightly fixed to avoid sparking and heating at the connection point.
| Wire type | Color (standard) | Function | Where to connect |
|---|---|---|---|
| Phase (Input) | Brown / Red | Power supply | Pin 3 or L |
| Phase (Output) | Black / Blue | To the compressor | Pin 4 or 1 |
| Grounding | Yellow-green | Protection | Housing refrigerator |
| Neutral | White / Blue | Common zero | Contact N |
After connecting the electrics, secure the thermostat housing with screws and install the decorative panel. Make sure that the control knob rotates freely and does not touch adjacent elements. Only after final assembly can you begin testing.
Configuring and testing operation
After replacement thermostat the refrigerator must be plugged in. Do not load the products immediately - let the equipment run idle for at least 2-3 hours. The initial startup may take longer than usual, as the system needs to get cold.
Turn the regulator knob to different positions. You should hear clear clicks as you move through the on and off points. If there are no clicks, you may have connected the wires incorrectly or a defective new sensor. Check the connections again.
⚠️ Attention: If, after replacing the thermostat, the compressor runs continuously for more than 6 hours without shutting down, this may indicate a freon leak or a malfunction of the compressor itself, and not an error in installing the sensor.
The optimal temperature in the main chamber should be about +4...+5°C. If the refrigerator starts to freeze too much or, conversely, does not keep cold, it will need to be adjusted again. Some models Indesit have an adjusting screw inside the thermostat housing, but touching it without special equipment (thermometer) is not recommended.
Typical errors during replacement
The most common mistake is damage to the capillary tube during installation. Even a microscopic crack will lead to leakage of the working substance, and the thermostat will stop responding to temperature changes. Work with the tube extremely carefully, without sudden movements.
The second mistake is ignoring sealing. The place where the tube exits the chamber must be carefully sealed with sealant. If you leave a gap, warm air from the room will constantly get inside, causing freezing and extra load on the motor.
The third mistake is using the wrong analogue. Thermostats differ in their operating temperature range. Installing a relay from the freezer into the refrigerator compartment (or vice versa) will cause food to either rot or freeze to stone. Always check the markings.
Sometimes technicians forget to check that the wires are securely fastened. Poor contact causes the insulation to heat up and melt, which can cause a fire. Make sure that all terminals are tight and the wires are not loose.
Is it possible to install a thermal relay from another brand of refrigerator?
Theoretically, it is possible if the dimensions, rod length, temperature range and contact pattern match. However, it is better to use original spare parts Indesit or proven analogues (Danfoss, Ranco) to avoid problems with setup.
Why does the refrigerator work longer than usual after replacement?
This may be due to the fact that the new thermostat has a slightly different response range, or you loaded warm foods. The reason may also be a loose fit of the tube to the evaporator. Give the equipment a day to stabilize.
Do you need to defrost the refrigerator before replacing?
Full defrosting is not necessary if you work quickly. However, if there is a lot of ice in the chamber, it may interfere with access to the fasteners. The main thing is to prevent water from getting on the electrical contacts of the new thermostat.
What to do if the new thermostat clicks, but the compressor does not start?
Check the compressor start relay and the integrity of the motor windings. Perhaps the problem is not in the thermostat, but in the engine itself. Also make sure that you have correctly connected the wires to the contacts of the new relay.
How can you tell if the thermostat is faulty without a multimeter?
The easiest way is to short-circuit the wires going to the thermostat (bypassing it). If, when shorted, the compressor starts and the refrigerator begins to freeze, then the thermostat is faulty. Be careful: in this mode, the refrigerator will not turn off automatically.