When your Indesit refrigerator stops freezing properly or, conversely, turns food into ice blocks, the thermostat is often the first suspect. This small but critical element is responsible for maintaining the set temperature inside the chambers. Owners of household appliances often panic when faced with such symptoms, but in many cases the problem can be identified on their own without calling a technician.
Understanding this how to check the thermostat of an Indesit refrigerator at homewill help you save time and money on diagnostics. If a part really fails, replacing it is not the most difficult process, but it requires precision and compliance with safety precautions. In this article we will look at all the nuances: from initial signs of malfunction to professional testing using a multimeter.
Before you start disassembling, it is important to make sure that the problem lies in the thermostat, and not in a freon leak or a compressor malfunction. Thermostat is essentially an electrical switch that opens the circuit when a certain temperature is reached. If this mechanism gets stuck or loses contact, the refrigerator's operating cycle is disrupted. Let's look at how exactly this manifests itself in models Indesit.
Main signs of a malfunctioning thermostat
The first signal that thermostat it's malfunctioning is the incorrect behavior of the compressor. In a working refrigerator, the motor turns on and off cyclically, maintaining temperature balance. If the unit works without interruptions, hums for days on end, but the temperature in the chamber does not drop below +10 degrees, this is a sure sign that the sensor does not signal to turn off.
The opposite situation also exists: the refrigerator does not turn on at all. You open the door, the light inside is on, but the motor is silent. When turning the control knob to maximum, the characteristic click is also not heard. This may mean that the contacts inside the part have oxidized or completely burned out, and the electric current simply does not reach the compressor starting relay.
- 🧊 The compressor works continuously, without going to rest, and the food in the chamber freezes more than usual.
- 🔇 Complete lack of response from the motor to turning the thermostat knob, silence when turned on to the network.
- 💧 The appearance of ice or a “snow coat” on the back wall even with minimal cold settings.
- 🌡️ Sudden temperature changes: products are either defrosted or covered with ice without changing the settings.
It is worth noting that in two-chamber models Indesit with the No Frost system, the thermostat is often responsible for only one of the chambers or the defrost mode. Therefore, symptoms may be less obvious. For example, there is cold in the freezer, but it is hot in the refrigerator compartment, or vice versa. In such cases, diagnostics require a more careful approach to a specific component.
⚠️ Attention: If your Indesit refrigerator makes strange sounds (gurgling, hissing) and does not freeze, the problem most likely lies in a refrigerant leak, and not in the electrics. Checking the thermostat in this case will not give a result, since the sensor regularly waits for the desired temperature, which does not occur due to the lack of freon.
Where is the thermostat in Indesit refrigerators
Location thermostat directly depends on the model of your refrigerator and the type of control (mechanical or electronic). In most old and budget models Indesit with mechanical control, the unit is located inside the refrigerator compartment. Usually this is a plastic knob with numbers located in the upper right corner or on the ceiling of the chamber.
To get to the insides, you need to remove this knob. She just pulls herself, sometimes with a little effort. Under it you will see a plastic case, which also needs to be carefully removed by snapping the latches or unscrewing the screws. It is inside this casing that the capillary thermostat is hidden In more modern models with electronic control, the situation is different. There, the role of a mechanical sensor is performed by electronic thermistors (resistances). They can be located: with a long tube-sensitive element.
In more modern models with electronic control, the situation is different. There, the role of a mechanical sensor is performed by electronic thermistors (resistances). They can be located:
- 📍 On the back wall inside the refrigerator compartment (often closed with a plastic plug).
- 📍 In the evaporator of the freezer (requires partial disassembly).
- 📍 In the area of the crying evaporator behind the panel.
No Frost design features
In Indesit refrigerators with the No Frost system, the thermostat (or defrost sensor) is often located directly on the evaporator, hidden behind the back panel of the freezer. To access it, you will need to remove all shelves, drawers and unscrew the fastening screws of the plastic cover. Be careful with plastic latches - they become brittle in the cold.
In this case, there will be more wires inside the case, and the testing circuit will become more complicated. Always take a photo of the connection before disconnecting any wires, so as not to mix up the contacts during assembly.
Preparation for diagnostics: tools and safety
Before starting any work with electrical appliances, you must strictly follow safety rules. Checking the thermostat involves working with a 220 Volt electrical circuit, so the first and the most important step is to completely disconnect the refrigerator from the network. Don’t just turn off the button, if there is one, but unplug the plug from the socket.
For high-quality diagnostics, you will need a minimum set of tools. The main device will be multimeter (tester), which allows you to measure resistance and check the integrity of the circuit. Without this device, it is almost impossible to make an accurate diagnosis, since a visual inspection rarely shows internal broken contacts.
☑️ Tools for testing
You may also need pliers to carefully remove the terminals and, possibly, a knife for stripping wires if oxidation has reached the cores. Do not forget to prepare a container for defrosting if during dismantling you need to bend the sensitive tube and condensation remains in the system.
⚠️ Attention: Never try to check the continuity of the circuit with a multimeter while the refrigerator is plugged in! This will cause the tester's fuses to instantly blow and may result in electric shock. All manipulations with probes are carried out only on de-energized equipment.
ovation.
If you are testing in winter or in a cold room, let the refrigerator warm up to room temperature before diagnostics. A cold thermostat may show false results, since its contacts will be open due to the low ambient temperature, even if the device itself is working.
Visual inspection and initial check
After you get to the thermostat, do not rush to grab the multimeter. Start with a careful visual inspection. The case thermostat must be intact, without cracks or traces of melting. Pay special attention to the exit point of the capillary tube: if it is pinched, has creases or signs of corrosion, this may cause incorrect operation.
Check the condition of the contact group. If it is possible to carefully open the case (in some models this is easy to do, in others the case is sealed or filled with a compound), inspect the contacts for carbon deposits, oxidation or sparking. Black deposits on the contacts indicate that the spark has jumped, which over time leads to burning and loss of conductivity.
Do a simple listening test. At room temperature, the thermostat contacts are usually closed (unless these are specific models for freezers). Turn the control knob all the way to the right (maximum cold) and to the left (minimum). In a working device, distinct clicks should be heard in extreme positions. The absence of clicks may indicate jamming of the mechanism.
| Symptom | Possible cause | Probability of thermostat failure |
|---|---|---|
| The refrigerator does not turn on | Open circuit in the thermostat | High (60%) |
| Works without stopping | Contacts are “stuck” in the closed state | Medium (40%) |
| Frequent on/off | Incorrect calibration or freon leak | Low (20%) |
| There are clicks, but the motor does not start | Faulty start relay or compressor | Low (10%) |
However, visual inspection and listening are only preliminary stages. They do not provide a 100% guarantee. Even if the contacts appear clean, there may have been a microscopic tear inside the bimetallic strip that is only visible under magnification. Therefore, let's move on to instrumental diagnostics.
Checking the thermostat with a multimeter: step-by-step instructions
This is the most reliable way diagnostics. You will need a multimeter set to resistance mode (indicated as Ω or "Ohms") or to "test" mode (speaker icon). If you have selected the continuity mode, then when the probes are closed, the device will emit a sound signal.
First, remove the terminals from the thermostat contacts. Usually there are two or three. If there are three terminals, then one of them goes to grounding (case), and the other two are the power circuit. We are interested in power contacts. In some models Indesit they may be labeled or color-coded, but it is better to focus on the connection diagram.
Touch the two contacts of the thermostat with the multimeter probes. At room temperature (about +20..+25°C), a working refrigerator thermostat should “ring” - show resistance close to zero. If the multimeter screen shows one (infinity) or the device is silent in the continuity mode, it means that the circuit is broken and the thermostat is faulty.
Next, check the operation in dynamics. Leave the probes on the contacts and begin to rotate the regulator knob. At some point (usually in the "minimum" or "off" position) the contacts should open and the ringing sound will stop. If nothing changes when you turn the knob, the contacts are either constantly closed or constantly open. In both cases, the part requires replacement.
⚠️ Attention: In two-chamber refrigerators, thermostats with normally open contacts (for freezers) can be used. Such models will not have a circuit at room temperature. Therefore, before checking, be sure to find out the model of your thermostat or use the “freezing” method to confirm.
Alternative testing methods without a multimeter
What to do if you don’t have a tester at hand, and you need to check the refrigerator urgently? There is a "direct switch" method, but it requires extreme caution and awareness of the risks. The essence of the method is to exclude the thermostat from the circuit and supply voltage directly to the compressor.
To do this, you need to remove the terminals from the thermostat and connect them together using a jumper (a piece of wire with stripped ends). If, after turning on the refrigerator, the compressor starts working and it starts getting cold, then the problem is really in the thermostat. If the motor hums but does not start, or nothing happens, the problem is deeper (compressor, relay, wiring).
This method is good for quickly localizing the problem, but leaving the refrigerator to work with a jumper is absolutely forbidden! Without a thermostat, the compressor will work continuously, which will lead to freezing of the evaporator, food spoilage and eventual combustion of the motor. Use this method only as a test for 1-2 minutes.
- 🔌 Disconnect the wires from the thermostat.
- 🔗 Connect the wires directly (maintaining insulation!).
- ⏱️ Turn on the refrigerator for 30-60 seconds.
- 👂 Listen to the compressor start.
Another indirect method is observing the operating cycle. If you have a separate refrigerator thermometer, place it in the freezer. Start the unit. If the temperature has dropped to +2..+4°C, and the motor has not turned off for more than 40-50 minutes, this is an almost guaranteed malfunction of the thermostat or a gas leak.
Replacing the thermostat: a brief algorithm of actions
If the check confirms the malfunction, thermostat it is necessary to replace it. There is no point in repairing it - a sealed capsule with gas or liquid cannot be restored at home. Fortunately, these parts are inexpensive, and their installation is quite simple.
First of all, purchase an analogue. Look for markings on the body of the old part (for example K59-L1276, TAM-133 etc.). If the exact model is not commercially available, you can select a universal analogue by checking the length of the capillary tube and the type of contacts. The length of the tube is critical: if it is too short, the refrigerator will not turn off; if it is too long, the tube will have to be carefully rolled up without bending.
Installation process:
- Disconnect the refrigerator from the network.
- Remove the old thermostat, remembering the route of the tube.
- Install the new sensor, carefully laying the tube along the original path (often it is secured with clips or inserted into a special hole).
- Connect the wires according to the photographs taken earlier.
- Secure the regulator knob and turn on the refrigerator.
After replacement, it may be necessary adjustment. Let the refrigerator run for several hours. If it turns off too early (underfreeze) or too late (overfreeze), there is usually a screw under the seal inside the adjustment knob. Turning this screw half a turn allows you to shift the temperature response range.
Can I use a thermostat from another brand?
Yes, often thermostats from refrigerators Indesit are interchangeable with parts from Atlant, Stinol or Beko. The main thing is the coincidence of the geometric dimensions, the length of the capillary tube and the type of contacts (two or three terminals). However, it is best to look for original catalog numbers or their direct analogs.
Why does the new thermostat click, but the refrigerator does not freeze?
If you replaced the thermostat, there are clicks, but there is no cold, the problem may be that the sensor tube does not fit tightly to the evaporator. Also, the reason may be a poor-quality new part (defect) or, more likely, the malfunction lies not in the thermostat, but in the compressor or lack of freon.
How often do you need to change the thermostat in the Indesit refrigerator?
Service life thermostat usually 5-10 years. It does not require scheduled replacement if it works correctly. Frequent power surges in the network can shorten its life, so using a voltage stabilizer will extend the life of all refrigerator electronics.
Is the gas inside the thermostat capillary tube dangerous?
Inside the tube there is an inert gas (often freon) in small quantities under low pressure. In case of mechanical damage (if you accidentally bite the tube during installation), the gas will quickly evaporate and dissipate. This is not dangerous for a person in a well-ventilated room, but it is still worth protecting your eyes from a possible stream of gas.
What to do if the thermostat knob scrolls endlessly?
This is a sign of a breakdown of the internal mechanism of the regulator. Most likely, the spring flew off or the splines were cut off. In this case, temperature control is not possible and the refrigerator will operate in one mode (usually at maximum cold). A complete replacement of the unit is required.