The situation when Indesit No Frost refrigerator stops turning off is one of the most alarming for the owner of household appliances. The compressor hums continuously, trying to reach the set temperature, but the cooling system cannot cope with the load or receives incorrect signals from the sensors. If you ignore this symptom, you may encounter overheating of the motor, spoilage of food due to incorrect temperature conditions and a significant increase in electricity bills.
The technology No Frost is based on a complex system of air circulation, sensors and automation, which differs from classic drip systems. Constant operation of the motor-compressor indicates that the cooling cycle is not completed, or the control unit “thinks” that it is still warm in the chamber. Understanding the physics of the process will help you quickly determine the source of the fault and decide whether to call a technician or repair it yourself.
It is worth noting that modern models, such as Indesit EF 18 or series BIS, are equipped with electronic modules controls that can block shutdown in emergency mode. Before disassembling the unit, it is necessary to carry out primary diagnostics, eliminating simple external factors that are often overlooked in panic.
Primary diagnostics: external factors and settings
Before suspecting serious damage to internal components, it is necessary to exclude operating errors. Often the reason lies in a banal leak or improper installation of regulators. If warm air enters the chamber from outside, the compressor will work endlessly, trying to compensate for the heat gain. Check the tight fit rubber seal along the entire perimeter of the door.
Particular attention should be paid to the temperature settings. In some electronically controlled Indesit models, a network failure could put the refrigerator into Super Freeze (super-freeze) mode, in which turning off the compressor is programmatically prohibited for a certain time or until a manual reset. Also check if the buttons on the control panel are stuck.
⚠️ Attention: If you hear a characteristic hissing or whistling, but the compressor is silent and the light inside is on, the problem may not be continuous operation, but a lack of startup. If the motor hums smoothly and continuously, this indicates operation under load.
To quickly check leaks, use a simple method with a sheet of paper. Clamp the sheet with the refrigerator door and try to pull it out. If the paper is pulled out without resistance in some place, it means that there is a break contact of the seal with the body.
Faults in the No Frost defrosting system
The most likely reason for the continuous operation of the Indesit refrigerator with the system No Frost is a malfunction in the evaporator defrost circuit. Unlike the drip system, here the moisture is frozen on a radiator hidden behind the rear wall. Periodically, this ice must be melted Defrost heating element. If this process is disrupted, the evaporator becomes overgrown with a “fur coat” that blocks the circulation of cold air.
The compressor continues to work, trying to cool the chamber, but cold air simply cannot pass through the layer of ice to the products. Temperature sensors in the chamber record the heat and instruct the motor to work even harder. The key elements of this system are:
- ❄️ Defrost heating element —a heating element that can burn out and stop heating.
- ❄️ Defrost sensor —a thermostat that should open the heating element circuit when a certain temperature is reached.
- ❄️ Defrost timer (or electronic module) - a device that switches the "cooling" and "defrost" modes.
If one of these components fails, the defrost cycle does not start or complete. As a result, in 2-3 days the evaporator turns into a monolithic piece of ice. This can be seen visually if you remove the plastic panel in the freezer: you will see frost or an ice crust on the fins of the radiator.
Symptoms of a malfunctioning heating element
If the heating element is burned out, the refrigerator will work for days. An ice block forms on the back wall of the freezer, and in the main chamber the temperature may be higher than normal, although the motor hums without interruption.
Problems with the thermostat and temperature sensors
The thermostat (thermostat) is the “brain” that makes the decision to turn off the compressor. Indesit refrigerators can use both mechanical and electronic sensors. If the mechanical thermostat fails, its contacts may “stick” in the closed position, constantly supplying voltage to the motor.
In models with electronic control (Full No Frost), air sensors are responsible for the temperature. They are thermal resistances whose resistance changes depending on temperature. If the sensor “lies” and shows the control module that the chamber is +10°C instead of the real -18°C, the compressor will not receive a command to stop.
Diagnostics of the thermostat requires caution. In mechanical models, you can temporarily close the thermostat contacts (if the design allows and you are confident in your abilities) to check whether the motor will start. However, to accurately check the electronic sensor, you will need a multimeter to measure resistance at different temperatures.
Faulty start-up relay and compressor
Sometimes it seems that the refrigerator does not turn off, but in fact the problem lies in the operation of the compressor itself or its starting equipment. Start-protective relay is responsible for starting the motor and protecting it from overloads. If the relay is faulty, it may not open the starting winding, which is why the engine operates in abnormal mode, gets very hot and hums, but does not develop the required power.
The compressor itself may also be worn out. A decrease compression (pressure) inside the unit leads to the fact that the motor runs, but does not pump out a sufficient amount of freon to achieve the set temperature. It works in vain, consuming electricity but not creating cold.
You can check the operation of the relay by gently knocking on it (sometimes it helps for a short time) or replacing it with a known good one. If the relay sparks or makes a loud noise during operation, it must be replaced. Also pay attention to the temperature of the compressor housing: if it is hot to the point where it is impossible to touch it with your hand, this is a sign of overload or jamming.
Refrigerant leakage and system blockage
These two technical problems often go in conjunction with symptoms of continuous operation. If there is an occurrence in the circuit freon leak (due to microcracks in the evaporator tubes or corrosion), the pressure in the system drops. The compressor tries to compensate for the lack of refrigerant by working without stopping, but no cold is added.
Clogged capillary tube is another reason. Oil breakdown products or moisture entering the system can clog the narrow opening of the tube. The circulation of freon stops, the pressure at the outlet of the compressor increases, and at the inlet it drops. The motor is idling.
It is difficult to diagnose these conditions without a pressure gauge station, but there are indirect signs:
- 🧊 The condenser grille at the back of the refrigerator remains cold or only partially heats up.
- 🧊 A yellow coating may appear where the tubes exit the foamed part of the body (oil) or swelling of the paint.
- 🧊 The compressor operates very quietly or, conversely, louder than usual, with a metallic clang.
⚠️ Attention: Self-refilling with freon or attempting to clean the capillary tube at home is impossible without specialized equipment and skills. A call to a technician with a vacuum pump and a charging station is required.
☑️ Diagnostics before calling a technician
Comparative table of symptoms and causes
For the convenience of systematizing the data obtained, we present the main symptoms and the corresponding malfunctions in a summary table. This will help you navigate the nature of the breakdown.
| Symptom | Probable cause | Difficulty of repair | Required parts |
|---|---|---|---|
| Ice on the back wall freezers | Malfunction of the defrost system (heating element, sensor) | Average | Heating element, sensor, timer |
| The compressor is hot, the relay clicks | Malfunction of the start relay or compressor | Medium/High | Relay, compressor |
| The refrigerator does not cool, the grille is cold | Freon leak or blockage | High | Freon, filter-drier |
| The motor hums, but does not turn off, the chamber is warm | Faulty thermostat or sensor | Low/Medium | Thermostat, air sensor |
Action algorithm and safety measures
If you find that your Indesit does not turn off, follow the algorithm. First, defrost the refrigerator completely (at least 24 hours with the doors open). This will eliminate the “snow coat” factor on the evaporator. After connecting to the network, note the operating time until the first shutdown.
If, after complete defrosting, the situation repeats within 24 hours, intervention in the design is necessary. Remember that any work related to the electrical part should only be carried out when complete shutdown the device is connected to the mains. Do not touch the metal parts of the compressor and tubes if you are not sure that there is no voltage.
In the event that If you do not have the skills to work with a multimeter or do not know how to get to the heating element in your model, it is better to contact a service center. Incorrect assembly of the evaporator assembly can lead to damage to plastic parts or loss of circuit tightness.
Is it possible to operate a refrigerator if it does not turn off?
Short-term operation (several hours) is acceptable, but long-term operation in this mode (a day or more) will lead to overheating of the compressor windings, melting of plastic elements and possible fire. In addition, the food in the main chamber may deteriorate due to the lack of a normal cooling cycle.
Why, after defrosting, did the refrigerator turn off again after a couple of days?
This is a classic sign of a malfunction of the defrosting system. During defrosting, the ice melted and the refrigerator worked normally. But since the heating element or sensor does not work, a new layer of ice grows again, blocking the channels, and the cycle repeats.
How much does it cost to replace a defrost heating element in Indesit?
The cost consists of the price of the spare part (usually from 1000 to 2500 rubles depending on the model) and the cost of the work of the technician. Replacing it yourself is cheaper, but it takes time to find an original or compatible part.
How to understand that the compressor has burned out and not the relay?
If you hear a click when you turn it on, the motor tries to jerk and goes silent, and after a while the click repeats - most likely the problem is in the start relay or the compressor is jammed. If the motor hums smoothly, but does not cool and gets very hot, there may be a leak or loss of compression.
Does the voltage in the network affect continuous operation?
Yes, a very low voltage in the network may not allow the compressor to develop the required power to reach the temperature, and it will work longer. However, this is usually accompanied by unstable operation of the light and other devices.