Sudden defrosting of food or, conversely, the formation a thick ice crust on the back wall of the chamber indicates that thermostat it has failed. This is the heart of the temperature control system, and its incorrect operation makes normal use of household appliances impossible. If you notice that the compressor hums continuously or does not turn on at all, while there is heat inside the chamber, most likely the problem lies in the sensor. Indesit. If you notice that the compressor hums continuously or does not turn on at all, while there is heat inside the chamber, most likely the problem lies in the sensor.
Independent replacement of this element is a task accessible to a person with minimal skills in working with tools, but requires strict adherence to safety precautions. Indesit refrigerators most often use thermostats of the TAM or K-59 series, which have specific markings and the length of the capillary tube. It is important to understand that incorrect selection of an analogue or violation of the sequence of actions can lead to more serious compressor breakdowns.
In this article we will analyze in detail the process of diagnostics, selection and installing a new temperature controller. You will learn how to get to the unit in different models, what to look for when buying a spare part and how to avoid typical mistakes that beginners make during the first repair.
Diagnostics of a thermostat malfunction
Before disassembling the unit and buying new parts, you need to make sure that the problem is really in the thermostat. Users often confuse sensor failure with a freon leak or a faulty start relay. Primary diagnosis helps save time and money. If your refrigerator Indesit stops freezing, but the light inside is on and the compressor is silent, this is the first alarm signal.
There are several proven ways to check thermostat at home without the use of complex measuring equipment. The simplest method is visual inspection and a contact closure test. However, remember that any manipulations with the electrical part are possible only after disconnecting the device from the network.
- 🔍 Exclusion method: If, when turning the control knob to the extreme position, a click is not heard and the compressor does not start, the contacts are probably not closing.
- 🔌 Direct circuit: After removing the terminals from the sensor, connect them together (using a jumper). If the motor-compressor works, the culprit has been found.
- ❄️ Cold test: Place the removed sensor in the freezer for 15 minutes. If after this, when connecting the multimeter, the resistance does not change or “beeping” does not appear in the dialing mode, the part is faulty.
It is worth considering that in modern models with the system No Frost diagnostics may be complicated by the presence of an electronic control module. In such cases, there may be no mechanical click, and the test is carried out by measuring the resistance at the terminals.
⚠️ Attention: If, after closing the contacts, the compressor starts, but after a few minutes of operation the machine knocks out or a burning smell appears, stop the test immediately. This may indicate a short circuit in the motor windings or a wiring fault, not just in the sensor.
Do not ignore indirect signs, such as frequent turning on and off of the motor at short intervals. This may indicate that capillary tube the thermostat has lost its seal or has moved, and the sensor does not “feel” the real temperature in the chamber.
Selection of compatible spare parts for Indesit
The spare parts market offers There are many options, but Indesit it is critical to choose a model with the correct capillary tube length and type of fastening. Using universal analogues without taking these parameters into account will lead to either the impossibility of installation or incorrect operation of the system.
The main parameter when choosing is labeling. Most often in refrigerators of this brand there are thermostats TAM-133, TAM-145 or imported analogues K-59. The numbers at the end of the marking often indicate the length of the tube, which varies from 0.75 to 2.5 meters. If you buy a sensor with a tube that is too short, you will not have enough length for proper installation in the evaporator.
Pay attention to the number of contacts on the body. A standard thermostat for single-chamber models or refrigerators with one compressor usually has three outputs. The presence of a fourth contact may indicate a specific connection diagram for an indicator or an additional relay.
| Marking | Type of application | Tube length (approximate) | Features |
|---|---|---|---|
| TAM-133 | Single-chamber, freezers | 0.75 m | Short tube, short range |
| TAM-145 | Double-chamber (Indesit, Ariston) | 2.5 m | Long tube, standard for two-chamber |
| K-59 L1102 | Analog TAM-133 | 0.75 m | Imported analogue, high reliability |
| K-59 P1142 | Analogue TAM-145 | 2.5 m | Full functional analogue |
When ordering spare parts through online stores, always check not only the name of the refrigerator model, but also a visual photo of your old part. Manufacturers Indesit over the years of production could use different components even within the same series.
Necessary tools and preparation
To successfully replace the thermostat, you will need a minimum set of tools that any master can find in the house. The main thing is to provide yourself with good access to the inside of the refrigerator compartment and a comfortable work place.
You will need screwdrivers (Phillips and flathead), pliers with narrow jaws and, possibly, side cutters to carefully trim the excess length of the tube if you bought a universal option with a reserve. Also don’t forget about a multimeter for a final check of the system’s functionality.
☑️ Tools for replacement
Preparing the refrigerator is not only defrosting, but also organizing the space. Remove all food, remove shelves and drawers that interfere with access to the ceiling light or the top panel where the thermostat is usually located.
⚠️ Attention: Before starting work, be sure to defrost the refrigerator completely (at least 24 hours). An attempt to bend or straighten a frozen capillary tube of a new thermostat will lead to its instant kinking and the release of freon from the system, which will require expensive repairs from professionals.
Ensure good lighting of the work area. It is often dark inside the refrigerator compartment, and small parts such as springs and terminals require careful visual inspection.
Removing the old thermostat
The process of removing a faulty part in refrigerators Indesit usually begins with dismantling the lampshade or the top decorative cover, depending on the models. In most two-chamber models, the thermostat is hidden behind a plastic panel at the top of the refrigerator compartment.
Carefully remove the temperature control knob. It may be a tight fit, so be careful not to jerk too hard to avoid breaking the plastic stem. Under the handle you will see a nut or screw that secures the sensor housing. By unscrewing them, you will gain access to the insides of the unit.
The most crucial moment is removal capillary tube from the evaporator. It passes through a special hole in the chamber wall and is secured there with sealant or a plastic retainer.
- 🔧 Removing the terminals: Take a photo of the location of the wires before disconnecting. Colors may differ from the diagram, so the photo will be your insurance.
- 🧊 Releasing the tube: Carefully pull the tube out of the channel. If it is glued, do not use force - it is better to carefully cut off the old sealant with a scalpel.
- 🧵 Removal: Pull the tube out slowly, being careful not to damage its thin walls. Any microcrack will make the part unusable.
In some models Indesit the tube can be secured with a metal bracket on the back wall inside the chamber. It must be carefully bent or unscrewed to release the sensor.
What to do if the tube breaks off inside?
If, when removing, the capillary tube breaks inside the wall channel, do not try to pick at the wall with a screwdriver - you will break the circuit. The best solution is to carefully clean the end and insert a new tube nearby, sealing the entrance with silicone, or use an extension if the design allows.
After removal, inspect the installation site. Moisture or rust may accumulate there, which must be removed with a dry rag before installing a new element.
Installation and connection of a new sensor
Installation of a new one thermostat is carried out in the reverse order of dismantling, but with important nuances. First of all, it is necessary to correctly form a turn of the capillary tube. It should not have creases, bends at an acute angle or tension.
Insert the sensitive element of the tube into the evaporator (or secure it to the chamber wall if the design involves surface mounting, which is typical for some models Indesit No Frost). The length of the free part of the tube must correspond to the original so that the coil does not interfere with closing the door or operating the fan.
Connecting the electrical part requires precision. Use the photo you took earlier to restore connections. Typically the circuit looks like this: one wire goes to the compressor, the second to the relay, the third to the lamp or indicator.
Fix the thermostat housing in the seat. Make sure it fits snugly and doesn't wobble. Vibration during compressor operation should not be transmitted to the sensor, otherwise it will cause false alarms.
⚠️ Attention: It is strictly forbidden to connect wires "twisted" without insulation. Use standard terminals or reliable soldering followed by heat shrink insulation. Poor contact will lead to heating and melting of the plastic.
Setup and initial launch
After assembling all the elements and checking the reliability of the fastenings, you can proceed to the test run. Plug in the refrigerator. In the first minutes, the compressor may not start immediately - this is normal for modern engines with protection.
Turn the adjustment knob to the middle position. After 5-10 minutes, a click should be heard and the motor-compressor will start. If this does not happen, check the connection diagram again and the presence of voltage on the contacts.
The first cycle of operation may take longer than usual, since the system needs to gain temperature. Do not load the chamber with products in the first 2-3 hours of operation, let the refrigerator Indesit go to mode.
Control the temperature in camera for 24 hours. If the refrigerator freezes food or, conversely, does not gain cold, it may be necessary to fine-tune the screw under the handle or replace the sensor with a model with other parameters.
Possible problems after replacement
Even with correct installation, nuances may arise. For example, the refrigerator may turn off too early, not having time to cool the chamber to the desired temperature. This is often due to the fact that the bulb of the new sensor does not fit tightly to the evaporator.
Another common problem is the continuous operation of the compressor. This may indicate a freon leak (if the tube is intact) or that the installed thermostat has too wide a temperature range and does not “see” sufficient cooling.
- 🔊 Extraneous noise: If a whistle or hissing appears after replacement, check whether the capillary tube touches the fan blades (in No Frost models).
- 🧊 Ice: The formation of a "fur coat" only around the sensor tube indicates poor contact with the surface of the evaporator.
- 💡 The light does not come on: Check the third contact of the thermostat, if in your model it is responsible for opening the lamp circuit when the door is closed (rarely, but it happens).
If you are faced with a situation where the refrigerator is working, but the temperature does not correspond to the set one, try turning the adjusting screw (usually located under the handle or inside the case) half a turn clockwise or counterclockwise.
Is it possible to install a thermostat from another manufacturer?
Yes, it is possible if the mounting dimensions, the length of the capillary tube and the temperature range of operation match. For example, Italian Ranco are often used instead of Russian ones THERE, but you need to carefully check the markings.
Why does the Indesit refrigerator not turn off after replacement?
There may be reasons three: freon leak (the compressor cannot reach the temperature), the thermostat is incorrectly selected (too “warm”) or the sensor bulb is in poor contact with the cold surface of the evaporator.
How to understand that the capillary tube is broken?
In the place of the break, the tube will have a whitish color or visible deformation. If after installation the refrigerator does not respond to changes in the position of the handle and does not click, most likely the freon inside the tube is blocked by a crease.
Do I need to wait for defrosting before replacing?
Yes, definitely. Ice in the evaporator can damage the new tube during installation, and moisture inside the chamber will make work difficult and create a risk of short circuit.
What does the L marking on the thermostat mean?
The letter L in the marking (for example, K-59 L1102) usually indicates the length of the capillary tube. For Indesit most often you need tubes 2.5 meters long (labeling may vary depending on the sensor manufacturer).