The refrigerator hums and does not freeze: a full analysis of the reasons

The situation when the refrigerator makes noise strange gurgling or shimmering sounds, but at the same time it ceases to perform its direct function - cooling, often causing panic among owners. It seems that the expensive device has completely failed and the food is about to go bad. However, before calling a technician or looking for a new unit, it is necessary to carry out initial diagnostics. Often the reasons lie not in a breakdown, but in the peculiarities of the system or improper operation.

Modern models of refrigeration equipment, be it Indesit, Atlant or premium LG, are designed on a similar principle, but have their own design features. Understanding the physics inside the camera will help you differentiate normal operating conditions from critical failures. In this article, we will analyze in detail why noise occurs and the cold disappears, and what steps to take to solve the problem.

Physics of the process: normal circulation of refrigerant

First of all, you should calm down: gurgling is a natural sound for most refrigerators. The refrigerant (freon) constantly circulates inside the system, changing its state of aggregation from liquid to gaseous and back. When liquefied gas enters the expansion valve and then into the evaporator, the pressure drops sharply, which is accompanied by characteristic gurgling, hissing or overflowing of water.

Especially often, such sounds are heard immediately after the compressor is turned on or when it stops. At this moment, the pressure in the circuit is equalized, and the movement refrigerant becomes most active and noisy. If your refrigerator is new or has just been defrosted, the intensity of the sounds may be higher due to the lack of ice, which dampens vibrations during operation.

It is important to understand the difference between operating noise and signs of malfunction. The working sound is usually uniform, quiet and not accompanied by other alarming symptoms. If the absence of cold is added to the murmur, this is a signal that the circulation is impaired or the system is not working efficiently. In such cases, a deeper check of the components is required.

⚠️ Attention: If the refrigerator makes sounds, but has not frozen for several hours, do not leave it in this condition for a long time. Operating a compressor without heat removal can lead to overheating and costly repairs.

Seal failure: freon leak

One ​​of the most serious reasons why a refrigerator makes loud noises and stops freezing is depressurization of the circuit. Freon is a substance that circulates in a closed system. If a microcrack appears in the tubes or connections, the gas begins to escape. When the amount of refrigerant decreases, the compressor tries to compensate for the lack of pressure, working almost non-stop, which increases the circulation noise.

Often, leakage occurs not due to manufacturing defects, but as a result of mechanical damage. For example, if you carelessly defrost, you can pierce it with a knife evaporator. Cracks can also form at solder joints due to vibration or corrosion. It is difficult to determine a leak visually, but an indirect sign is swelling of the side walls of the refrigerator or the appearance of oily spots near the compressor.

If a leak has occurred, simple refilling will not help. It is necessary to find the place of depressurization, solder it and only then refill the system. It is impossible to carry out this procedure independently without specialized equipment (vacuum pump, pressure gauges, leak detector).

Clogged capillary tube: ice plug and debris

Another common technical problem that causes a lack of cold in the presence of operating sounds is a clogged capillary tube. This part is a thin copper pipe where the refrigerant is throttled. The diameter of the tube is extremely small, so even a microscopic particle of debris or frozen moisture can completely block the flow of liquid.

There are two main types of blockages. The first is technological blockagecaused by compressor wear products (copper oxide, solder particles) that entered the system during installation or during long-term operation. The second type is ice plug, which is formed due to moisture entering the circuit. Water freezes in the narrowest part of the tube, blocking the circulation of freon.

When there is a blockage, you can hear the compressor trying to push gas, making straining sounds, and a whistle may be heard inside the refrigerator. The pressure in the system increases, but the cooling capacity drops to zero. To eliminate the problem, a professional cleaning of the system with nitrogen under high pressure and replacement of the filter drier is required.

Compressor malfunctions: when the motor does not pull

The compressor is the heart of the refrigerator. If it does not work correctly, normal refrigerant circulation is not possible. Users often hear that the unit is “murmuring”, but in reality this may be the sound of boiling oil inside the valves or the noise of gas bypass due to loss of power by compression. In such cases, the refrigerator may hum, but not create the necessary pressure for cooling.

One ​​of the common problems is turn-to-turn short circuit windings or wear of the mechanical parts of the engine. The compressor may start, run for a few seconds or minutes, make strange sounds (knocking, clanging, gurgling), and then turn off via a thermal relay. This is a protective reaction to overheating or overcurrent.

It is also worth checking the start-up relay. If it fails, the compressor may hum but not start, or start jerkily. In some models, for example, in old Indesit or Biryusa, the relay can be replaced independently if you have the skills to work with electrical equipment. However, diagnosing the compressor itself requires measuring the resistance of the windings and checking the compression.

⚠️ Attention: Do not try to repair the compressor yourself by opening its housing. This is a sealed unit that cannot be repaired at home. A complete replacement of the unit is required.

Problems with the No Frost system: fan and sensors

In refrigerators with the system No Frost the lack of cold in the presence of noise is often associated not with the compressor, but with a violation of air circulation. In such models, the cold is generated in a separate evaporator (usually in the freezer) and distributed among the chambers by a fan. If the fan is faulty or frozen, cold air does not enter the main compartment.

The sounds of gurgling in this case may be associated with defrosting operation. When the defrosting heating element is turned on, the ice melts and water flows into the drain, which is accompanied by gurgling. If the drain hole is clogged, water may overflow the tray or freeze, creating ice jams that interfere with the fan's operation. The fan, in turn, may make noise or squeak if its blades catch ice.

For diagnostics, you need to defrost the refrigerator completely (at least 24 hours with the doors open). If after defrosting the unit began to freeze normally, then the problem was ice freezing. If the problem recurs after 1-2 weeks, it means that one of the sensors (defrost, defrost) or the timer is faulty.

• ❄️ Check whether the fan spins when the door is open (in some models it turns off, in others it continues to work).
• 🌬️ Clean the air ducts between the freezer and refrigerator compartments from ice and foreign objects.
• 🔌 Make sure that the heating element defrost heats up (requires testing with a multimeter).

The impact of improper operation on the operation of the unit

The reason does not always lie in the breakdown of parts. Often, users themselves create conditions under which the refrigerator cannot freeze effectively, and the operating sounds become louder. For example, loading hot products into the chamber leads to a sharp increase in humidity and temperature. The compressor begins to wear out, trying to cool the volume, and the condensate actively freezes on the evaporator, creating a noisy “fur coat”.

Another mistake is installing the refrigerator close to the wall or in a niche without gaps for ventilation. The condenser (grid at the back or on the sides) must release heat to the environment. If airflow is disrupted, the refrigerant does not condense properly, system pressure rises and efficiency drops. In such conditions, additional noise and vibration may occur.

It is also worth checking the door seals. If the elastic does not fit tightly, warm, moist air constantly enters the chamber. This leads to increased formation of ice on the evaporator, which blocks the access of cold and forces the compressor to work continuously. Replace the seal or adjust the door if you notice gaps.

⚠️ Attention: Characteristics and installation requirements may vary depending on the model. Always check the official instructions of the manufacturer of your device, as some modern models require larger gaps for ventilation than older counterparts.

Self-diagnosis algorithm

To understand whether you can solve the problem yourself or whether it’s time to call service, perform a sequential check. This will help you more accurately describe the problem to the technician or, perhaps, avoid an unnecessary call. Start with simple steps that do not require tools.

First, listen to the nature of the sound. If this is a quiet transfusion, this is most likely the norm. If there is a loud gurgling sound with no cold, a leak or blockage is suspected. Then check the temperature in different zones. If the freezer is working and the refrigerator compartment is warm, the problem may be a clogged capillary or a malfunction of the damper (in No Frost).

Be sure to perform a complete defrost. This is a universal test that eliminates problems with evaporator freezing and sensors. If, after 24 hours of inactivity with the doors open and then turning on, the cold appears, but after a couple of days it disappears again, look for a malfunction in the defrosting system or tightness.