If your Indesit refrigerator stopped maintaining the set temperature, started working without stopping, or, conversely, stopped turning on, the problem often lies in the thermostat. This small component is responsible for supplying voltage to the compressor depending on the temperature in the chamber. Thermostat diagnostics is the first step, which allows you to avoid costly replacement of the compressor or refilling with freon.
Fault temperature sensor can manifest itself in different ways: from a complete absence of cold to the formation of a “fur coat” on the back wall. It is important to understand that in models Indesit No Frost and drip systems, the operating principle of the thermostat is similar, but the location and dimensions may differ. Before calling a specialist, it is worth carrying out a basic check, which any home handyman can do with a minimum set of tools.
In this article we will analyze an algorithm of actions that will help accurately determine the condition thermostat. You will learn how to safely remove the part, what parameters to measure with a multimeter and what to pay special attention to when visually inspecting the contacts. Critical
Main signs of a thermostat malfunction
Understanding the symptoms is half the success in repair. If thermostat fails, the refrigerator Indesit begins to behave uncharacteristically. Most often, owners are faced with a situation where the compressor hums continuously without turning off for hours. In this case, the food in the chamber can freeze, turning into ice blocks, and a thick layer of frost forms on the back wall.
The opposite situation - the unit is silent. You plug the cord into the outlet, the light comes on, but the engine does not start. If at the same time a quiet click is heard, but the compressor does not start, there is a high probability that thermostat contacts the circuit is not closed. It is also worth paying attention to sudden temperature changes when food is defrosted and then frozen again.
There are a number of indirect signs indicating problems with temperature control system. For example, if you turn the control knob, but the nature of the motor does not change, this is an alarming signal. In some cases, a faulty sensor can give false commands, causing the refrigerator to turn on too often.
- ❄️ The compressor runs non-stop for more than 2-3 hours, ignoring the set mode.
- 🔇 Complete lack of reaction from the refrigerator to turning on, despite a working socket and light bulb.
- 💧 The appearance of puddles under the refrigerator due to melting food or excessive defrosting of the evaporator.
- 🌡️ Inconsistency between the temperature in the chamber and the position of the regulator knob (too cold or warm).
⚠️ Attention: If the refrigerator Indesit makes strange sounds or vibrates more than usual when trying to start, do not start it multiple times. This may indicate a compressor wedge or problems with the start relay, and not just the thermostat.
It is worth noting that similar symptoms can occur with a refrigerant leak. However, if there is no leak (the pipes are hot but there is no cold), then thermostat becomes the main suspect. Accurate diagnostics requires removing the part and checking its electrical characteristics.
Preparation for diagnostics and dismantling the part
To carry out a quality check thermostat in the refrigerator Indesit you need to get it access. In most models, this element is hidden inside the camera or behind the control panel. Before starting work, be sure to disconnect the appliance from the power supply by removing the plug from the socket.
In classic models with a drip system, the thermostat is often located inside the refrigeration chamber. You will need to remove the plastic cover that hides the adjustment knob and remove the screws that secure the housing. Be careful with capillary tube —it is very thin and easily damaged if handled carelessly.
If you have a model Indesit No Frost, the thermostat may be located behind the back panel of the freezer or in a special compartment on top. Some modern versions use an electronic sensor, but mechanical thermostats are still common. To dismantle you will need a Phillips screwdriver and possibly pliers.
☑️ Checklist for preparing for repairs
The removal process requires care. Remember or take a photo of which wire is connected where. Usually these are three contacts: one for grounding (housing) and two for switching the compressor circuit. Capillary tube fixed in the evaporator; it must be carefully released without bending sharply.
- 📸 Take a photo of the wiring diagram before disconnecting them.
- 🔧 Use insulated tools to work with electrical contacts.
- 🧊 Give it to the refrigerator warm up to room temperature before checking, if it was in operation.
- 🔌 Check the integrity of the wires for melting or mechanical damage.
⚠️ Attention: The design of refrigerators Indesit may vary depending on the year of manufacture. If you are not sure about the location of the thermostat, check the technical documentation of a specific model on the manufacturer's official website.
Visual inspection and initial check
After removal thermostat from the housing Indesit carry out a thorough visual inspection. Look for signs of corrosion on the contacts, melted plastic, or damaged insulation. The presence of a black coating on the terminals may indicate poor contact and sparking, which often leads to sticking.
Pay attention to the condition capillary tube. There should be no creases, cracks or traces of oil on it. If the tube is deformed, the thermostat will not be able to read the temperature correctly and replacement is inevitable. Also check whether the sensor bulb sits securely in its seat.
The initial check can be carried out without a multimeter, using the “diagnosis” method using a simple light bulb or tester in resistance mode. At room temperature, the contacts of a normally open thermostat should be open, and the contacts of a normally closed thermostat should be closed. However, refrigeration thermostats is characterized by the state of closed contacts when heated.
Nuances of the operation of the capillary tube
Inside the capillary tube there is a gas or liquid that expands when heated and contracts when cooling. This change in volume is transmitted to the membrane, opening or closing electrical contacts. Any microcrack leads to leakage of the working fluid and complete inoperability of the unit.
If no visual defects are found, we proceed to instrumental diagnostics. Often the problem lies inside the case, where the contacts have oxidized or the spring has weakened. In such cases visual inspection will not give a 100% guarantee, and measurement of electrical parameters is required.
Diagnostics with a multimeter: step-by-step instructions
The most accurate way to check thermostat is to use multimeter Switch the device to resistance (Ohm) or continuity measurement mode. Before starting measurements, make sure that the part is completely dry and warmed up to room temperature.
Connect the multimeter probes to the thermostat contacts. For most models Indesit at room temperature, the resistance should be close to zero (the circuit is closed). If the device shows “1” or infinity, it means that the contacts are not closing and the thermostat is faulty. This means that the compressor will not receive a command to start.
For a full test, you can place the sensor in a cold environment. Gently lower capillary tube in a container with cold water (not lower than -10°C to avoid damage) or place in the freezer for 15-20 minutes. After cooling, the contacts should open and the multimeter should show an open circuit. If the circuit remains closed, the thermostat is “stuck.”
It is important to check not only the main contacts, but also the grounding contact (if there is one). The resistance between the thermostat body and any contact should be infinite. The presence of conductivity indicates an insulation breakdown, which is life-threatening.
- 🔋 Make sure that the multimeter battery is charged, otherwise the readings will be incorrect.
- 🌡️ Do not artificially heat the thermostat with a hairdryer - this may lead to irreversible changes in calibration.
- 🔌 Check each contact separately, if there are more than two.
- 🧊 When cooling, make sure that water does not get inside the thermostat housing.
Table of typical values and parameters
Different models of thermostats installed in Indesit refrigeratorsmay have different technical characteristics. Below is a table with guide values to help you interpret the measurement results. Remember that the exact data depends on the specific modification.
| Parameter | Normal value | Fault value | Action |
|---|---|---|---|
| Resistance at +20°C | 0 Ohm (Short) | ∞ (Open) | Replacing the thermostat |
| Resistance at -15°C | ∞ (Break) | 0 Ohm (Short) | Replacing the thermostat |
| Insulation resistance | ∞ (Infinity) | Any value | Urgent replacement (dangerous) |
| Opening point | -3..-5°C (average) | Does not open | Checking the capillary |
If your measurements coincide with the “Value for malfunction” column, then the thermostat requires replacement. Do not attempt to repair the internal mechanics - this is a one-time use item. When purchasing a new part, pay attention to the markings and length of the capillary tube.
Replacing the thermostat and checking its functionality
If the diagnostics confirm a malfunction, you need to install a new thermostat. Select an analogue with identical parameters: temperature range, capillary tube length and type of fastening. Installing an unsuitable part can lead to incorrect operation of the Indesit refrigerator.
Install the new thermostat into the seat, carefully straightening the capillary tube. Fasten it in the standard hole of the evaporator in the same way as the old one was fixed. Connect the wires according to the photograph or diagram you took earlier. Make sure that all connections are tight and reliable.
After assembly, plug in the refrigerator. The unit will rise to temperature for the first few hours, so don't be alarmed if it doesn't turn off right away. After 4-6 hours, check whether the compressor turns off when the set parameters are reached.
⚠️ Attention: If, after replacing the thermostat, the refrigerator continues to operate incorrectly, the problem may be deeper: the start relay is faulty, there is a freon leak, or the system capillary is clogged. In this case, professional diagnostics are required.
Frequently asked questions (FAQ)
Is it possible to temporarily close the thermostat contacts to make the refrigerator work?
Yes, technically this is possible for a short-term check of the compressor, but it is absolutely forbidden to leave the refrigerator in this mode. The compressor will work continuously, which will lead to freezing of food and overheating of the engine, as well as to huge energy consumption.
Where can I find the thermostat markings for the Indesit refrigerator?
The markings are usually applied to the metal body of the thermostat itself. To see it, you often have to remove the protective plastic casing or completely remove the part from the niche. Look for a code starting with the letters TAM, K, or R.
Why does the new thermostat not click?
If the new one thermostat does not make clicks when the temperature changes, it may be defective or designed for a different model. Also the clicking sound can be very quiet. Check it with a multimeter: if the resistance does not change when cooling/heating, the part is faulty.
Does the length of the capillary tube affect the operation of the refrigerator?
Yes, length and sensitivity capillary tube are critically important. If the tube is too short, the sensor will not reach the evaporation zone and the thermostat will “lie” about the temperature. When replacing, try to find a model with a similar length or carefully place the excess without breaking the tube.