The situation when a refrigerator Indesit stops turning off and hums around the clock is familiar to many owners of this popular equipment. In normal operation, the compressor should turn on and off several times per hour, maintaining the set temperature. If the motor runs without interruption, this not only leads to a sharp increase in electricity bills, but also creates a critical load on the unit components.
Continuous operation of the compressor indicates that cooling system cannot achieve the required parameters, or the control electronics receives incorrect data. Owners often panic, believing that the equipment has completely failed, but in many cases the problem can be solved without expensive intervention. It is important to understand the physics of the process: if heat is not removed or cold is not accumulated, the cycle does not complete.
Before calling a technician, it is necessary to carry out initial diagnostics to eliminate common operating errors. Sometimes the reason lies in small things, such as a door that is not closed tightly or the temperature regulator is not installed correctly. Ignoring the problem can lead to overheating and failure of the compressor itself, the repair of which will cost much more than replacing the seal or thermostat.
Primary diagnostics and external factors
The first step should be to eliminate external factors that force the refrigerator to work in increased mode. Users often forget that room temperature directly affects the operation of the equipment. If the refrigerator is installed next to a radiator, stove, or in direct sunlight, it will try to cool the chamber, but heat will flow faster than the cold is produced.
Check the tightness of the door. If the rubber seal wears out, becomes dirty or deformed, warm air constantly penetrates into the chamber. This causes the sensors to detect an increase in temperature and command the compressor to operate continuously. A simple test with a sheet of paper clamped around the perimeter of the door will help identify weak points in the seal.
⚠️ Attention: Do not install the refrigerator closer than 10-15 cm from the wall. Violation of the gap for ventilation of the condenser on the rear wall is a common cause of overheating and continuous operation of the motor.
It is also worth paying attention to the quantity and temperature of products loaded into the chamber. If you put a large pot of hot soup in a Indesit here or loaded a lot of food at room temperature at once, the refrigerator will work hard until it cools the entire volume. This is a normal reaction, but it should not last for days.
Malfunctions of the thermostat and temperature sensors
One of the most common reasons why a refrigerator Indesit does not turn off is a failure of thermostat (thermostat). This mechanical or electronic unit is responsible for closing and opening the compressor power circuit depending on the temperature inside the chamber. If the contacts are stuck or the mechanism breaks down, the circuit does not open and the motor hums without stopping.
In models with electronic control (No Frost), air sensors are responsible for the temperature. If such a sensor “lies” and sends a signal to the control module that the chamber is +10°C instead of the required +4°C, the compressor will run endlessly. Replacing these elements requires disassembling the internal panel and having a multi-MRT for dialing.
Symptoms of a thermostat malfunction often manifest themselves in the fact that the refrigerator either does not turn on at all, or, conversely, works without interruption, severely overcooling the food. In some cases, you can temporarily disconnect the unit from the network, wait 15 minutes and turn it on again to reset the electronics error, but this is only a temporary measure.
How to check a mechanical thermostat?
To check a mechanical thermostat, it must be removed and placed in a cold environment (for example, in a freezer) for 30-40 minutes. After this, ring the contacts with a tester: they should open. If the contacts are closed even in the cold, the thermostat is faulty and requires replacement.
Problems with the compressor and motor
Themselves compressor can also be the source of the problem, although this occurs less frequently than a breakdown of the control electronics. Over time, the mechanical part of the engine wears out, the piston group loses compression, and the unit is physically unable to create the necessary pressure in the system. As a result, the refrigerator works, but does not cool to the desired temperature, and the cycle is not interrupted.
Another problem is the “fatigue” of the start relay. If the relay is faulty, it may not start the engine correctly or may not turn off the starting winding, resulting in continuous operation and a characteristic hum. In such cases, a click is often heard, after which the engine hums, but does not start, or starts and does not stall.
It is important to listen to the sound of the operating unit. If the humming becomes louder, or a metallic clanging or knocking sound appears, this is a sure sign of mechanical damage to the compressor. Operating equipment in this condition is dangerous, as the motor may jam or even the wiring may catch fire due to overload.
Leakage refrigerant and system blockage
The most difficult and unpleasant reason for continuous operation is freon leak (refrigerant). If a microcrack has formed in the circuit, the amount of gas decreases and the pressure drops. The compressor tries to compensate for the lack of refrigerant by working in enhanced mode, but cannot reach the thermostat cut-off point.
Indirect signs of a leak are:
- 🧊 Poor cooling in both chambers or only in one of them.
- 🔥 The compressor is hot to the touch, and the condenser (grid at the back) is barely warm or cold.
- ❄️ Formation of a "snow coat" only in the corner of the evaporator or its complete absence.
- 🔊 Change in the sound of the motor (may become quieter or, on the contrary, appear gurgling).
Similar symptoms are observed with clogged capillary tube. Oil breakdown products or moisture entering the system can clog the thin channel through which freon moves. The pressure at the outlet of the compressor increases, but no refrigerant flows into the evaporator. In both cases, professional repairs are required using special equipment for vacuuming and filling.
⚠️ Attention: An independent attempt to find a leak using a soap solution is often ineffective for microcracks in the foamed part of the case. For accurate diagnosis, you need a leak detector.
Failures in the electronic control module
In modern models Indesit with a system No Frost and an electronic display, control moduleis responsible for all processes. This is the “brain” of the refrigerator, which reads sensor readings and controls the compressor, fans and defrost heating elements. If the compressor control triac on the board burns out or there is a failure in the firmware, the shutdown signal may simply not be received.
Often the module fails due to voltage surges in the network or moisture ingress. Visually, traces of burning, swollen capacitors or oxidized contacts may be visible on the board. Repairing a module requires deep knowledge of electronics and soldering, so at home it is usually replaced with a new one.
☑️ Diagnostics before calling a technician
Sometimes the problem is solved by a simple reboot. It is necessary to unplug the refrigerator from the outlet for 15-20 minutes. This will clear errors in the controller memory. If after turning on the situation repeats itself a few hours later, then the problem is hardware in nature.
Table of main symptoms and probable causes
For ease of diagnosis, below is a table comparing the observed symptoms with the most probable malfunctions. This will help narrow down the search for the problem before contacting the service.
| Symptom | Probable cause | Difficulty of repair |
|---|---|---|
| The refrigerator hums, but does not cool | Freon leak, system clogged | High (requires a master) |
| Motor is hot, does not turn off | Thermostat is faulty, compressor wear | Medium/High |
| The chamber is too cold, food freeze | Thermostat contacts sticking | Low/Medium |
| A click is heard, then a buzzing sound and turns off | Faulty start relay | Low |
| Indicators blink, error on display | Electronics failure, sensor break | Medium |
Frequently asked questions and answers (FAQ)
How long should the Indesit refrigerator work and how long should it rest?
In normal mode, the operating cycle is approximately 15-20 minutes of work and 20-40 minutes of rest. The ratio of work to rest time depends on the load of the chamber and the temperature in the room, but continuous operation for more than 2 hours without a break is a sign of a malfunction.
Is it possible to operate a refrigerator if it does not turn off?
For a short time - yes, to finish eating food. However, prolonged operation in this mode will lead to overheating of the compressor windings, oil burnout, and other failure of the unit. The life of the motor is reduced significantly.
Why does the refrigerator not turn off for a long time after defrosting?
After defrosting, the walls and food are warm. The refrigerator takes time (from 2 to 6 hours depending on the model) to reach operating mode. If after 6-8 hours it continues to buzz without stopping, this is a breakdown.
What does the flashing temperature indicator on Indesit mean?
A flashing indicator (often red) signals that the temperature in the chamber has risen above normal. If at the same time the compressor runs continuously, it means that it cannot cope with cooling due to a freon leak or a malfunction of the compressor itself.
Is it possible to replace the thermostat yourself?
If you have skills in working with electricians and tools - yes. A mechanical thermostat is relatively easy to change. However, in models with No Frost replacement of sensors requires disassembling the internal lining, which is difficult to do without damaging the plastic.