The situation when the refrigerator is workingthe light is on inside, the hum of the engine is heard, but the food begins to deteriorate, and the cells are warm, is one of the most common and alarming. The owner of the equipment is often at a loss: whether to turn off the device completely, call a technician, or try to find the problem on their own. It is important to understand that the absence of cold when the compressor is running indicates a violation in one of the components of the refrigerant circulation or temperature control system.
The first thing that needs to be done is to carry out an initial visual diagnosis and rule out trivial causes, such as a loose door fit or installation of the unit close to the wall. If outwardly everything is in order, but compressor it hums continuously or, conversely, turns on and off too often, the problem lies deeper. In this article, we will analyze in detail the main breakdowns, from freon leakage to sensor failure, and will help you determine whether your model requires Indesit, Atlant or Liebherr complex repairs.
It is worth noting right away that some faults can be fixed with your own hands, but others require intervention by professionals licensed to work with refrigerants. Ignoring the problem can lead to complete combustion of the engine or damage to the entire food supply. Therefore, if you are not confident in your abilities, it is better not to risk it and contact the service center after the initial check.
Checking the correct installation and loading of the chambers
Before disassembling the equipment or calling a technician, make sure that the refrigerator is installed correctly. Violation of installation rules is a common reason why the unit is not freezing. If the device is too close to the wall or radiators, heat exchange is disrupted and the system does not have time to remove heat. Also check whether the door is sticking to the floor due to skew or whether it is touching the furniture.
The second important aspect is the correct loading of the chambers. If you put a freshly cooked hot pan in the refrigerator, the sensors could record a sharp jump in temperature, and the system could go into active freezing mode or, conversely, temporarily stop cooling due to overload. Also, do not fill the chambers with food to capacity: air should circulate freely between the shelves.
⚠️ Attention: Never install the refrigerator close to the wall. The minimum distance to the rear wall must be at least 10 cm for free air circulation around the condenser.
Inspect the rubber seals on the doors. If they are dirty, deformed or simply do not fit tightly, warm air constantly enters the chamber. The compressor works hard, trying to compensate for the heat gain, but temperature conditions it is never achieved. Wipe the rubber bands with a soft cloth and soapy water and check the tightness around the entire perimeter.
Malfunctions of the defrosting system in No Frost refrigerators
In models with the system No Frost the lack of cold is often associated with a breakdown of the automatic defrosting system. If the evaporator is overgrown with a “coat” of ice, the air channels become clogged and cold air simply cannot enter the main chamber. In this case, the compressor can work continuously, trying to cool the space, but to no avail.
The main culprits in this situation are The defrosting heating element, a defrost sensor or a timer (relay). If the heating element burns out, the ice does not melt. If the sensor is faulty, it does not give a command to turn on the heater. As a result, an ice cocoon is formed, blocking the operation of the fan. In such cases, you can often hear how The refrigerator is humming, but there is no cold.
Diagnostics often require complete defrosting of the unit within 24 hours. If after this the refrigerator began to freeze normally, but after 1-2 weeks the problem recurred, it means that the defrosting system is really faulty and requires replacement of components.
☑️ Diagnostics of the No Frost system
It is worth considering that in some modern models the defrost system control is tied to an electronic module. If the control board is “buggy”, it may not supply voltage to the heating element. In this case, even a working heater will not start.
Refrigerant (freon) leakage as the main reason
One of the most serious reasons why the refrigerator does not coolis a refrigerant leak. Freon circulates in a closed circuit, and if a microcrack appears in the system (often in the foamed part of the housing or in soldering areas), the gas gradually evaporates. Without a sufficient amount of refrigerant, heat exchange is impossible.
Symptoms of a leak may vary. In some cases, the compressor runs constantly, trying to get up to temperature, but the evaporator housings are barely warm. In other situations, the motor turns on for a short time and sits for a long time. If you notice that the back wall inside the chamber is no longer covered with an even layer of frost or, conversely, has become completely dry and warm, this is a sure sign of a lack of freon.
⚠️ Attention: Refilling the refrigerator with freon yourself without finding and eliminating the leak is useless. The gas will leave again after a short time, and the compressor may burn out from operating without cooling.
Often leaks occur in places inaccessible to visual inspection, for example, in a foamed layer of thermal insulation. The technician may need to install a new external evaporator (weeping circuit) to restore the functionality of the equipment. This is a labor-intensive but necessary process.
Is it possible to use a refrigerator with a freon leak?
It is absolutely forbidden to operate equipment with a refrigerant leak. The compressor is designed to cool a certain volume of gas. When running “idle” or with a small amount of freon, the motor overheats, which leads to a wedge and expensive repairs or replacement of the compressor.
Failure of the compressor and start relay
Compressor is the heart of the refrigerator. If it is faulty, there will be no cold anywhere. However, sometimes the motor itself is intact, and the problem lies in the start relay. This small device is responsible for starting the engine. If the relay is burned out, the compressor may hum, click, but not start, or start for a split second and immediately turn off.
If the compressor works, but does not create the necessary pressure in the system (wear of the piston group), the refrigerator will also stop freezing. This can be determined by the temperature of the motor housing: if it is hot, but the outlet tubes are barely warm, most likely the compressor “does not pump.”
In modern inverter models, diagnostics are more difficult, since engine starting is controlled by an electronic module. Failure of the inverter board often simulates a breakdown of the compressor itself. Replacing such a unit requires qualifications and special equipment.
| Symptom | Possible cause | Necessary actions |
|---|---|---|
| The compressor hums, but does not start | Faulty starting relay or jammed motor | Replacing the relay, compressor diagnostics |
| The motor runs constantly, there is no cold | Freon leak or capillary blockage | Searching for leaks, refilling, purging systems |
| The refrigerator turns on and immediately turns off | The thermostat or sensor is faulty | Replacing the temperature sensor |
| A whistling or hissing is heard | Freon leakage in place damage | Urgent call for localization |
Clogged capillary tube
Another technical reason why the refrigerator has stopped freezing is clogged capillary tube. This is a thin copper pipe through which freon enters the evaporator. Over time, oil oxidation products may form in the system or moisture may enter, which freezes in the form of an ice plug.
Signs of a blockage are similar to a leak: the compressor works, but there is no cold. However, if you listen closely, you will notice that the motor becomes more strained, and the filter drier may become hotter than usual. Sometimes switching on for a short time at maximum power helps, but this is a temporary measure.
Removing the blockage requires professional purging of the system with high-pressure nitrogen and replacing the filter-drier. It is impossible to carry out this procedure on your own without a vacuum pump and a pressure gauge station.
Failures in the operation of the electronic control module
In modern refrigerators, such as Samsung, LG or Bosch, electronic control moduleis responsible for all processes. If moisture gets on the board, power surges occur in the network, or any radio element simply fails, the refrigerator may behave inappropriately: not turn on, not freeze, or freeze too much.
Often, module failure is accompanied by an error indication on the display or blinking lights. However, technology does not always clearly communicate the problem. Sometimes only one triac, which is responsible for supplying voltage to the compressor, burns out, and outwardly the board looks intact.
Module repair is not always possible. In some cases, it is cheaper and more reliable to replace the entire board, especially if it is filled with compound. It is also important to check the wiring going to the sensors, since an open circuit may be interpreted by the module as a sensor malfunction.
⚠️ Attention: Before replacing the electronic module, make sure that the problem is not in the wiring or the sensors themselves. The new board may burn out immediately after switching on if the short circuit remains in the circuit.
Frequently asked questions and answers (FAQ)
Why does the refrigerator work, but does not freeze after defrosting?
If after defrosting it is not cold appeared within 4-6 hours, perhaps a freon leak occurred when the ice was chipped with a sharp object. The sensor or heating element could also fail if defrosting was an emergency. Let the equipment run empty for several hours.
Is it possible to add freon yourself?
No, this is impossible without special equipment (scales, vacuum degasser, pressure gauges). In addition, you need to know the type of freon and the exact dosage for your model. Incorrect refueling will lead to compressor failure.
How long does it take the refrigerator to gain temperature after turning on?
Usually the process takes from 2 to 12 hours, depending on the volume of the chambers and the ambient temperature. If after 12 hours of operation of an empty refrigerator the cold does not appear, then there is a malfunction.
What to do if the refrigerator is noisy and does not freeze?
The noise may indicate the compressor operating without load (freon leak) or a mechanical breakdown (knock of valves). It is necessary to immediately disconnect the device from the network and call a technician for diagnostics in order to prevent complete failure of the motor.
Does seasonality affect the operation of the refrigerator?
Yes, if the refrigerator is in an unheated room (balcony, cottage) at a temperature below +10°C or above +35°C, it may not start or work intermittently. The refrigerant and oil are designed for a certain operating temperature range.