The situation when the refrigerator Indesit stops maintaining the set temperature often confuses the owner. The food begins to deteriorate, an ice crust appears on the walls, or, conversely, the chamber remains warm with the humming compressor. In most cases, the culprit of such anomalies is a failed one thermostat, which is responsible for the cyclic operation of the unit.
Replacing this element does not always require calling a specialist, since the design of many models allows you to carry out repairs yourself if you have basic skills and tools. However, before starting work, you need to clearly understand what type of regulator you are dealing with, since electronic and mechanical systems require fundamentally different approaches to diagnostics and installation.
In this article we will analyze in detail the process of identifying a malfunction, selecting an analogue and subsequent installation of a new thermostat. It is important to follow the sequence of actions so as not to damage the fragile capillary tubes and correctly set the operating temperature range for the specific model of your refrigerator.
Signs of a thermostat malfunction in Indesit refrigerators
Before disassembling the equipment, you should make sure that the problem lies in the thermostat. The main symptom is a violation of the cyclic operation of the compressor. If the motor-compressor operates continuously without turning off, and at the same time there is excessive cooling or freezing of the “coat” in the chamber, this is a direct signal that the regulator contacts are sticking.
The opposite situation also indicates a breakdown: the refrigerator is silent, does not respond to turns of the adjustment knob, and the temperature inside rises. In this case thermostat contacts they could oxidize or disperse, breaking the compressor power supply circuit. Sometimes the device makes clicks, but the engine does not start.
It is worth noting that similar symptoms can be observed with other malfunctions, for example, with a freon leak or problems with the start relay. Therefore, visual inspection and simple diagnosis are mandatory. If, when defrosting during the day, the refrigerator starts to work normally, but after turning it on again it “glitches”, the problem is most likely in the sensor.
⚠️ Attention: If the compressor hums, but does not start, or only a single click is heard, the problem may not be in the thermostat, but in the starting relay or the motor itself. Do not blindly change the sensor without checking the circuit.
Mechanical models are characterized by wear of the bimetallic plate, which loses its properties over time. In electronic systems, the sensors themselves or the control board often fail, but the diagnostic principle is similar - no response to changes in temperature conditions.
Necessary tools and preparation for repair
High-quality installation of a thermostat is impossible without the correct tools. You will need a standard DIY kit that can be found in any garage. The main requirement for tools is serviceability and safety, especially when working with electrical circuits.
The list of necessary equipment includes:
- 🔧 A set of screwdrivers (phillips and flathead of different sizes) for dismantling panels.
- 🔌 A multimeter or tester for “conductivity” of contacts and checking the continuity of the circuit.
- 🧤 Dielectric gloves and insulating tape for safe work with wiring.
- 🧊 A knife or spatula for carefully cleaning the ice (if necessary).
Before starting any work, a refrigerator Indesit is necessary de-energize. Unplug the power cord and move the unit away from the wall to gain access to the rear wall and interior shelves. It is also recommended to completely defrost the chamber if there is ice in it so that water does not get on the electrical contacts.
☑️ Preparing to replace the thermostat
It is important to prepare the workplace. Arrange the removed parts in the order they were removed to avoid confusion during reassembly. Taking photographs of the disassembly stages is an excellent habit that will help you remember where this or that screw was attached.
Removing the old thermostat: step-by-step instructions
The location of the thermostat in refrigerators Indesit depends on the model. In most cases it is located inside the refrigerator compartment, often hidden behind a plastic panel or built into the lighting control unit. In some older models, the regulator may be located outside, on the top panel of the case.
The process of removing a mechanical thermostat is as follows:
- Remove the temperature control knob by pulling it towards you (sometimes you need to pry it off with a flat screwdriver).
- Remove the protective cover or lampshade, under which the thermostat housing is hidden.
- Unscrew the fastening screws holding the device in the seat.
- Carefully pull the housing out, trying not to sharply pull the capillary tube.
Pay special attention to the capillary tube. This is a thin copper conductor that is inserted into the evaporator. Damage to the tube will lead to freon leakage from the thermostat system, and the new device will immediately fail. Remove it smoothly, helping yourself with your fingers or tweezers if access is limited.
Dismantling nuances in different models
In models with the No Frost system, the thermostat is often hidden deep behind the back wall of the chamber. Ducts and fans may need to be removed for access. Be careful with plastic latches - they become brittle in the cold.
After removing the case, you must disconnect the electrical wires. Before doing this, it is strongly recommended to photograph the connection diagram or mark the wires with a marker so as not to confuse the contacts when installing a new element. Typically, the terminals are simply removed by hand or using pliers.
Diagnostics and selection of a suitable replacement
An established fact of a malfunction requires replacement of the part. However, you can’t just buy the first thermostat you come across - they differ in the length of the capillary tube, operating temperature range and type of contacts. The markings are usually applied to the metal body of the device.
Popular markings for Indesit include the TAM, K59, T132 and others series. The numbers at the end of the label often indicate the temperature range. For example, devices marked “132” are designed for lower temperatures than “133”.
Comparative table of common thermostats:
| Marking | Type | Tube length | Application |
|---|---|---|---|
| TAM 132 | Mechanical | 0.75 m | Single-chamber refrigerators |
| K59-L1275 | Mechanical | 1.2 m | Two-chamber Indesit models |
| T133 | Mechanical | 0.9 m | Freezers |
| Electronic sensor | Digital | N/A | Models with display |
If you change mechanics to electronics or vice versa, you will need to redo the control circuit, which only a professional can do. Therefore, look for a complete analogue by catalog number. If the original is difficult to find, choose an analogue with similar parameters from well-known brands, such as Danfoss or Thermo.
Installation and connection of a new thermostat
Installation of a new device begins with checking its integrity. Make sure that the capillary tube is not kinked and that the contacts are clean. If the length of the tube of the new regulator is longer than the old one, the excess can be carefully rolled into a ring, but not pinched.
Installation process:
- 🔌 Connect the wires to the terminals of the new thermostat strictly in the same order in which they were removed. Use photo capture.
- ❄️ Carefully insert the capillary tube into the evaporator through the same hole, observing the bend radius.
- 🔩 Fix the device body in the seat using screws.
- 🧩 Reinstall the adjustment knob and protective panels.
Critical important: The end of the capillary tube should be in close contact with the surface of the evaporator. In some models, a special clamping bar or thermal conductive paste is used for this. If the tube hangs in the air, the sensor will show the incorrect temperature of the air, not the evaporator.
After assembling all panels, you can proceed to testing. Plug in the refrigerator. The compressor should start immediately or after a short time if the temperature in the chamber is higher than the set temperature. Power adjustment is carried out experimentally during the first 24 hours of operation.
Temperature adjustment and testing
After installing a new thermostat, time is required to stabilize the temperature background. Do not load the chamber with products immediately - let the unit enter the mode in an empty state. This will take from 4 to 12 hours depending on the volume of the chamber.
To check the correct operation, use an external thermometer placed in a glass of water on the middle shelf. The optimal temperature in the refrigerator compartment is +3...+5°C. If the readings are very different, adjustments are required.
Mechanical regulators often have an adjustment screw inside the housing or under the knob. Turning clockwise usually increases the shutdown temperature (the chamber is warmer), and turning it counterclockwise decreases it. Make turns no more than half a turn and wait for stabilization.
⚠️ Attention: Technical characteristics and location of adjusting elements may vary depending on the year of manufacture and the specific series of the Indesit refrigerator. Always check the technical documentation for your model.
If the refrigerator starts to turn on and off frequently (short cycle), the thermostat sensitivity may be too high or the tube may not be installed correctly. A long operating cycle without turning off indicates that the temperature range is shifted towards cold.
Common mistakes when replacing yourself
DIY Repair is fraught with risks, and beginners often step on the same rake. One of the most common mistakes is ignoring grounding. The thermostat housing is often metal, and if the insulation breaks down, dangerous voltage may appear on it.
Another mistake is excessive force when tightening the mounting screws. The plastic of old refrigerators Indesit becomes brittle and may crack, requiring replacement of the entire door or panel. Proceed carefully and without fanaticism.
Isolation of contacts is also often forgotten. Even if the wires are tightly seated, vibration from the compressor can loosen the connection over time. Use electrical tape or heat shrink to secure it, especially if the terminals look old and oxidized.
Do not forget that electronic control systems require calibration through the service menu, which cannot be done without special equipment. If you have a modern model with a display, replacing the sensor may require resetting errors in the controller's memory.
Is it possible to install a thermostat from another brand of refrigerator?
Theoretically, it is possible if the dimensions, length of the capillary tube and temperature range match. However, the contacts and fasteners may differ, which will require “collective farming” and adapters. It is better to look for the original or a direct analogue.
Why does the refrigerator not turn off after replacing the thermostat?
Possible reasons: the adjustment range is incorrectly set, the capillary tube is not in contact with the evaporator, freon leak in the main system, or the new thermostat itself is faulty (defective).
How to understand that the thermostat is stuck?
If, when you tap the handle of a screwdriver on the thermostat body, a working refrigerator turns off or a refrigerator that does not turn on starts, it means that the contacts inside are stuck or burnt. This is a temporary solution, a replacement is required.
Do you need to defrost the refrigerator before replacing?
Yes, this is a prerequisite. Moisture inside the chamber can cause a short circuit when connecting the wires, and will also make it difficult to access the fasteners and the evaporator.
How long does a new thermostat last?
The average service life of a high-quality mechanical thermostat is 5-7 years. Electronic sensors can work longer, but are more sensitive to power surges in the network.