The refrigerator does not freeze: causes of the malfunction and what to do

A sudden stop in the operation of refrigeration equipment is always stressful, because food supplies and the family budget are at risk. When you open the door and feel that it has become warmer inside than it should be, or the compressor is silent, it is important not to panic, but to act consistently. Primary diagnostics allows in most cases to identify a trivial cause that does not require calling a technician, or to understand that the problem is serious.

Modern models, be it Indesit, Bosch or Liebherr, are designed according to similar principles, although they have their own design features. The lack of cold can be caused either by a simple violation of operating rules or by the failure of complex components such as a compressor or an electronic control module. In this article we will analyze all possible scenarios.

Before taking active action, it is necessary to assess the scale of the problem: is only one chamber not working or is there heat throughout the entire volume? Is the engine humming or is there silence? The answers to these questions will be the key to understanding why your refrigerator stopped cooling exactly at this moment. Let's look at the algorithm of actions.

Primary diagnostics: checking the electrics and settings

The most common cause of “breakdown” that owners encounter is a simple lack of power or broken settings. If the compressor does not make any sounds and the light inside does not light, check that the plug is firmly inserted into the outlet. Sometimes it’s enough just to move the cord or check the machine in the panel. It is also worth making sure that the temperature control has not been accidentally moved by children or pets to the “0” or “Off” position.

In models with electronic control (Samsung Side-by-Side, LG Door-in-Door), a software failure may have occurred. Try rebooting: unplug the device for 10–15 minutes, and then turn it on again. This action often helps to reset errors in the controller, which may have “freezed” due to a power surge.

⚠️ Attention: If, after connecting to the network, you hear a loud click, smell a burning sensation, or see sparking, immediately turn off the device. Further attempts to start may result in a short circuit or fire.

Make sure that you have not accidentally activated the “Vacation” or “Demo” mode, in which the refrigerator simulates operation, but does not freeze. This is a common situation after returning from a long trip.

• 🔌 Check the integrity of the power cord and the presence of voltage in the outlet.
• ❄️ Make sure that the thermostat is set to the operating range (usually 3–5 °C).
• 🔘 Disable special saving modes or demonstrations.
• 🔄 Completely reboot the system by disconnecting from the network.

Violation of operating and placement rules

Even a serviceable unit will no longer cope with its task if its operating conditions are violated. A critically important parameter is heat transfer. If the refrigerator is located close to the wall, in a niche without ventilation, or next to a radiator, the condenser (grid at the back) cannot effectively transfer heat. As a result, the system wears out, but does not create the required temperature.

A common mistake is loading hot or warm products into the chambers. Thermal sensors detect a sharp rise in temperature and command the compressor to operate continuously. However, at a certain point, the system may go into protection or simply not cope with the amount of heat, especially in the summer. Also, do not fill the refrigerator with food to capacity - the air should circulate freely.

⚠️ Attention: The minimum distance from the back wall of the refrigerator to the wall should be at least 5–7 cm. For built-in models, ventilation grilles in the furniture are required.

Pay attention to the density door fit. If the sealing rubber is worn out, dirty, or simply not completely closed, warm air constantly flows inside. Check this with a simple test with a sheet of paper: clamp it with the door and try to pull it out. If it comes out easily, the seal is broken.

• 🌡️ Ensure free air circulation around the housing.
• 🚫 Do not place hot pots and pans on the shelves.
• 🚪 Check the tightness of the door closure and condition seal.
• 🧊 Do not overload the chambers, leave space for air flow.

Problems with the defrosting system (No Frost)

In refrigerator systems No Frost i Full No Frost the condition of the evaporator and the melt water removal system is critically important. If you see that a “fur coat” or a block of ice is frozen in the freezer compartment, but it is warm in the refrigerator compartment, most likely the water drainage channel is clogged or the defrost heating element is out of order. Ice blocks the fans, and the cold simply does not enter the upper chamber.

In this case, complete defrosting is required. Unplug the refrigerator, open the doors and leave it for at least 24 hours (preferably two days). This is necessary so that the ice melts even in hard-to-reach places inside the case. After defrosting, wipe everything dry and turn on the device without load for 2-3 hours.

⚠️ Attention: Never try to pick out the ice with a knife or other sharp objects! You can damage the evaporator tubes, which will lead to freon leakage and expensive repairs.

If after defrosting the refrigerator worked normally, but after 1-2 weeks the problem recurred, it means that one of the elements of the defrost system is faulty: heating element, timer, defrost thermostat or sensor. In modern models, an electronic module is responsible for this process, which could have failed.

Faults of the compressor and start relay

The compressor is the “heart” of the refrigerator. If you hear that the motor hums, tries to start, clicks and immediately turns off (or hums for 5-10 seconds and stalls), the problem lies in the start relay or the compressor itself. The starting relay is a small part that supplies an impulse to start the motor. Over time, the contacts in it burn out, and it ceases to perform its function.

Replacing the start relay is one of the simplest and cheapest repair procedures. The part is inexpensive and can be changed in 15 minutes. However, if after replacing the relay the situation has not changed, or if the compressor hums very loudly and gets very hot, but does not start, the motor-compressor itself may have jammed or its winding has burned out.

The table below shows the main symptoms and probable causes:

Refrigerant leak and system blockage

If the compressor works almost non-stop, it hums smoothly, but there is no cold (or it is very weak), and the condenser (grid at the back) remains only partially cold or warm, most likely there is a freon leak. The refrigerant circulates in a closed circuit, and if a microcrack appears in the tubes (often due to corrosion), the gas escapes.

Another problem with similar symptoms is clogged capillary tube. Oil circulates in the system, which over time can oxidize and form clots that block the freon flow. In both cases, the intervention of a specialist with professional equipment is required: a vacuum pump, a pressure gauge station and a supply of freon.

It is impossible to eliminate a leak or blockage on your own. Attempts to simply “refuel” the refrigerator without finding and eliminating the cause of the leak will give a temporary effect for a couple of weeks, after which the gas will come out again. In addition, different models require different types of refrigerant (R600a, R134a), and they cannot be mixed.

• 🔍 Look for oily spots on the floor or on the refrigerator tubes.
• 🌡️ Please note that the condenser may only be hot at the beginning of the circuit.
• 🔇 The compressor may operate more silently than usual due to a lack of gas.
• 🛠️ Professional soldering and vacuuming of the system is required.

When you need to call a specialist

There are a number of situations when self-repair is not only useless, but also dangerous. If you determine that the problem is a freon leak, a malfunction of the control module electronics, or mechanical damage to the compressor, it is better to contact a specialized service. Professionals have access to original spare parts and diagnostic software.

It is especially important not to hesitate if the refrigerator has stopped freezing, and an unpleasant smell has already appeared inside or food has begun to spoil. Prolonged operation of a faulty compressor can lead to its complete combustion, which will significantly increase the cost of repairs. Also, the technician will be able to accurately determine whether it is worth repairing the old unit or whether it is more economically feasible to buy a new one.