If your Indesit refrigerator stopped maintaining the desired temperature, started working non-stop or, conversely, turned on the compressor too rarely, the reason often lies in the thermoregulation system. It is the thermostat that is responsible for turning the engine on and off depending on the temperature inside the chambers. When this mechanism fails, the entire cooling cycle is disrupted, which can lead to food spoilage or freezing of the evaporator.
Before calling a technician, you should try to diagnose it yourself. This will save budget and time, as well as understand the scale of the problem. In this article, we will analyze in detail the device of the thermostat, the symptoms of its malfunction and step-by-step describe the process of checking with a multimeter. Accurate diagnostics will help determine whether the part needs to be replaced or the problem lies deeper.
However, it is worth remembering that any work with electrical equipment requires compliance with safety precautions. Disconnecting the device from the network is a prerequisite before starting any manipulations. If you are not confident in your abilities, it is better to entrust the repair to professionals, but understanding the process will allow you to competently discuss the problem with the service center.
Main signs of a malfunctioning thermostat
The first step to identifying the problem is monitoring the operation of the unit. Thermostat (or thermostat) is a mechanical or electronic sensor that closes and opens an electrical circuit. When it breaks, the behavior of the refrigerator Indesit becomes inadequate. You can notice this even without tools, just by listening and taking a closer look at the operation of the equipment.
The most common symptom is the continuous operation of the compressor. If the motor hums for days without rest breaks, and the food in the chamber begins to freeze, it means that the circuit does not open. In this case Thermostat contacts are stuck in the closed state, the signal to stop the engine is not received. This is a critical situation, leading to rapid wear of the compressor.
The opposite situation also occurs: the refrigerator is silent. The compressor does not start at all, the light in the chamber is on, but there is no cold. This indicates that the circuit is broken and the current simply does not reach the engine starting relay. The problem may also be indicated by:
- ❄️ A sharp decrease in cooling efficiency during normal operation of the motor.
- 🔊 Frequent clicks when trying to start the compressor, which immediately stalls.
- 🌡️ Inconsistency with the actual temperature set on the regulator.
- 💧 The appearance of ice or a “snow coat” in only one corner of the chamber.
⚠️ Attention: If the refrigerator makes a loud cracking sound or a burning smell when you try to start, immediately unplug it. Continued operation in this condition can lead to a fire or complete failure of an expensive compressor.
Sometimes users confuse a thermostat failure with a freon leak. However, if there is a leak, the compressor will also work continuously, trying to gain temperature, but there will be no cold. The main difference: when it breaks thermostat the evaporator is often covered with a uniform layer of ice, and when there is a leak, it is warm or only partially frozen. Only an instrumental check will give an accurate answer.
Where the thermostat is located in Indesit refrigerators
The location of the temperature sensor depends on the model and type of control of your Indesit. In most classic mechanically controlled models, the thermostat is located inside the refrigerator compartment. Usually this is a plastic twist knob located on the inner wall or in the lampshade.
If you have an electronically controlled model, where the temperature is set on the display outside, then there is no mechanical thermostat in the usual form. Its function is performed thermal sensors (thermistors), which are small elements of resistance. They can be built into the chamber wall, hidden under plastic panels, or located in the evaporator area.
To access the mechanical thermostat in older models, it is often necessary to remove the plastic cover. In some cases, for example, in series models Indesit C or ER, the thermostat can be hidden behind the back wall of the chamber or in a niche above the door. To get to it, you will have to remove the shelves and, possibly, part of the internal plastic.
In two-chamber models with a system No Frost the thermostat is often located in the evaporator area, hidden behind the back panel of the freezer. Getting to it is more difficult: you will need to remove all the drawers, the back wall and, possibly, dismantle the fan. Be careful when removing plastic elements, as they become fragile in the cold.
Secrets of accessing the thermostat
In some Indesit models, to remove the lampshade, you need to carefully pry it off with a flat screwdriver, but not with force, but with light pressure on the latches. If you pull too hard, you can break the plastic latches.
Preparation for diagnostics: tools and safety
Before you begin “surgical intervention,” you need to prepare your workplace and tools. You don't need a complex professional kit, but a basic DIY kit is a must. The main rule: all work is carried out only on disconnected from the power supply the device.
For diagnostics you will need:
- 🔌 Multimeter (tester) - the main device for checking the integrity of the circuit.
- 🔧 A set of screwdrivers (phillips and flat) for disassembling the case.
- 🧤 Gloves to protect your hands from sharp edges and cold.
- 🔦 A flashlight for illuminating hard-to-reach places inside the chamber.
If your refrigerator has just been running, let it sit unplugged for at least 15-20 minutes. This is necessary so that condensation the contacts dry out and the compressor cools down. This will also protect you from accidental electric shock, although 220V voltage is dangerous in any condition.
Inspect the place where the thermostat is supposed to be installed. If you see traces of corrosion, melted plastic or oxidized contacts, this is already half the battle to the diagnosis. Oxidation often leads to unstable operation or complete failure of the sensor. Before checking with a multimeter, it is advisable to clean the contacts with alcohol, if available.
⚠️ Attention: Never check the continuity of the circuit with a multimeter while the device is plugged in! This is guaranteed to lead to the burnout of the tester fuses or failure of the multimeter itself. All measurements are carried out only on de-energized equipment.
☑️ Preparing to check the thermostat
Step-by-step instructions: how to check the thermostat multimeter
The most reliable diagnostic method is checking resistance the integrity of the circuit using a multimeter. A mechanical thermostat is a simple device: inside there is a sealed flask with gas or liquid that reacts to temperature, and a contact group. Our task is to check whether the contacts close when conditions change.
First remove the thermostat. Disconnect the wires (after photographing their location so as not to get confused during assembly) and remove the sensor from its seat. Set the multimeter to continuity mode (usually indicated by a speaker icon) or resistance measurement (Ohms).
Touch the multimeter probes to the thermostat contacts. At room temperature, the contacts should be closed (if it is a regular thermostat), and the device will squeak or show resistance close to zero. If the device shows one or infinity, the circuit is broken and the thermostat is faulty. However, that's not all.
Now you need to check the reaction to temperature. Place the sensitive part of the thermostat (capillary tube or flask) in a container with cold water (about +5...+10°C) or, conversely, heat it in your hands if it reacts to heat. Depending on the type of sensor, the contacts should open or close. If there is no reaction, the part requires replacement.
For electronic sensors (thermistors), the check is slightly different. Here the resistance is measured, which should change smoothly with temperature changes. Sharp jumps or complete absence of resistance indicate a malfunction. Below is a table of approximate values for different states:
| Sensor condition | Environment temperature | Multimeter readings (Ohm) | Contact reaction |
|---|---|---|---|
| Service (room t°) | +20...+25°C | 0 - 5 Ohm (closed) | Short circuit (squeaking) |
| Service (cooling) | +3...+5°C | Infinity (break) | Opening (no sound) |
| Faulty (break) | Any | Infinity | No response |
| Faulty (sticking) | Any | 0 Ohm | Permanent short circuit |
If after checking it turns out that the thermostat is “lying” or does not respond, it must be replaced. Repairing sealed flasks of mechanical thermostats is practically impossible and economically unfeasible. It’s easier to buy a new analogue that is compatible with your model Indesit.
Replacing the thermostat: algorithm of actions
If the diagnostics confirmed a breakdown, we proceed to replacement. The new thermostat must be fully compatible with your model. The part number is usually stamped on the body of the old regulator. You can order an original or a high-quality analogue in specialized stores of spare parts for household appliances.
The installation process is as follows:
- Carefully remove the old thermostat, remembering exactly how it was secured.
- Compare the new one and the old sensors: the length of the tube, the shape of the bulb, the location of the contacts must match.
- Install the sensitive element in the same place where the old one was. It is important to ensure tight contact with the cooled surface.
- Connect the wires according to the photograph or diagram taken earlier.
- Fix the thermostat body and install decorative overlays.
Pay special attention capillary tube. It is very thin and fragile. During installation, do not allow it to be bent, pinched or damaged. If the tube is damaged, gas will escape and the thermostat will stop responding to temperature. Place it in the standard grooves without tension.
After assembly, do not rush to load the products. Turn on the empty refrigerator and let it run for 2-3 hours. During this time, it should gain temperature and turn off. If the cycle was successful and the compressor turned off and then turned on again when the temperature increased - repair was successful.
Common mistakes during self-diagnosis
Even experienced home craftsmen sometimes make mistakes that lead to false conclusions. One of the most common is ignoring the state of other elements of the system. For example, if compressor fails to start, the thermostat is not always to blame. The problem could be in the start relay, the motor itself, or even in the wiring.
Another mistake is incorrect interpretation of the multimeter readings. Beginners often forget to switch the device to the desired mode or do not calibrate it. It is also worth considering that some thermostats have normally open contacts that close only when the temperature is very cold. Testing such sensors “warm” will show an open circuit, which is not a malfunction.
Do not forget about electronic control modules. In modern Indesit models with a display, the breakdown may lie in the control board, and not in the sensor itself. If replacing the thermistor did not help, the electronics may be faulty and more in-depth diagnostics are required.
⚠️ Attention: If you find that previous technicians installed “universal” thermostats with electrical tape or twisted wires, expect problems. Such compounds oxidize and heat up. When making repairs, always use factory connectors or high-quality soldering with heat shrink.
Sometimes users try to “reanimate” an old thermostat by tapping it or heating it with a hairdryer. This is a temporary measure that may help you get to a parts store, but is not a repair. The mechanics inside are already worn out, and a repeated failure will occur in the near future.
The myth about adjusting the screw
Sometimes there is an adjusting screw under the thermostat cap. There is no point in turning it without a pressure gauge stand and experience - you will ruin the factory settings, and the refrigerator will start working in abnormal mode, freezing all the contents or not cooling at all.
Questions and answers (FAQ)
Is it possible to temporarily bypass the thermostat so that the refrigerator works?
Technically, it is possible close the contacts directly and the compressor will start working. But do this strongly not recommended for long-term use. The refrigerator will freeze continuously, which will lead to freezing of food, breakdown of the compressor from overload and possible melting of the plastic inside the chamber. This is an emergency measure only to check the compressor.
Which thermostat is better to buy for Indesit: original or analogue?
Original spare parts Indesit (often marked as Merloni or Cylinda) guarantee exact compliance with temperature conditions. High-quality analogues (for example, Tam or K59) also work well if selected according to their characteristics. The main thing is to pay attention to the length of the capillary tube and the type of contacts.
Why does the refrigerator not turn off after replacing the thermostat?
There may be several reasons: the thermostat is incorrectly selected (does not hold the shutdown temperature), freon leak (the refrigerator cannot reach the temperature to turn off), or the compressor itself is faulty. It is also possible that the sensitive bulb is installed in the wrong place or is in poor contact with the surface.
How much does it cost to replace a thermostat in the service?
The cost consists of the price of the part and the work of the technician. The part itself is relatively inexpensive, but a specialist visit and diagnostics may cost more. Self-replacement saves up to 50% of the total amount, but requires time and accuracy.