The situation when refrigerator suddenly ceases to perform its main functions can take any home cook by surprise. You open the door, and it’s warm there, the food begins to spoil, but at the same time freezer continues to freeze as if nothing had happened. This is a classic symptom that indicates specific problems in the cooling system, and cannot be ignored.
Most often, the cause is a violation of the refrigerant circulation or a malfunction of the control electronics. It is important to understand that in modern models, such as Indesit or Atlant, the system can be designed so that the cold first enters the freezer, and only then into the main compartment. If this process is disrupted, we get exactly this picture: there is ice, but no freshness.
Before calling a technician, it is worth conducting an initial diagnosis. Often the problem lies in trivial things that you can fix yourself in a few minutes. However, if the problem is compressor or a gas leak, professional intervention will be required.
⚠️ Attention: If you notice that the back wall of the main compartment is covered with a thick layer of ice (“coat”), and the food is not cooling, immediately defrost the unit for at least 12 hours. This can temporarily restore operation if the problem is that the capillary is clogged with ice.
The principle of operation of the No Frost system and static refrigerators
To understand the essence of the breakdown, you need to understand how the cold gets into different compartments. In devices with a system No Frost a fan is responsible for air circulation. It passes air cooled by the evaporator through special channels. If the fan stops or the channel becomes clogged, the cold simply does not reach the main chamber, remaining in the freezer.
In static models where a drip defrosting system is used, the process is natural convection. Cold air falls down from the evaporator. If the evaporator is overgrown with ice or there is little freon in the system, there is only enough cold in the nearest zone - the freezer, to which the gas reaches first.
The key element here is thermostat or the electronic control module. They are the ones who give the command to the compressor to turn on or off. If the sensor in the main compartment is “lying” and shows that it’s already cold there, the compressor may not turn on often enough to maintain the temperature.
Differences in design also dictate troubleshooting methods. In models LG with a linear compressor, diagnostics will differ from checking old Soviet units. It is important to take into account the age of the equipment and the characteristics declared by the manufacturer.
Problems with refrigerant: freon leakage and blockages
One of the most common reasons why refrigerator stopped cooling in the main compartment is a refrigerant leak. Freon is a working fluid that transfers heat. If its quantity in the system decreases due to microcracks in the circuit, the pressure is not enough to drive the cold through the entire volume.
In such a situation, the compressor works almost non-stop, trying to increase the temperature, but is only partially successful. The freezer located closer to the compressor outlet still has time to freeze, but there is no longer enough refrigerant resource to reach the refrigeration compartment. This is a classic sign freon leaksthat requires calling a technician to find the fistula and refill it.
Another option is a clogged capillary tube. Inside the thinnest tube through which freon moves, a plug may form from oil oxidation products or frozen moisture. This physically blocks the circulation of gas.
⚠️ Attention: An independent attempt to find a leak or clean the capillary can lead to permanent failure of the equipment. Working with freon requires a license and special equipment.
Symptoms of blockage are often accompanied by strange sounds. The compressor may hum, then suddenly stop, and after a while try to start again. The table below shows the main signs of problems with the refrigerant:
| Symptom | Probable cause | Required actions |
|---|---|---|
| The compressor runs constantly without turning off | Leakage freon | Search for leaks, evacuation, refilling |
| Hot grill in the back, but there is no cold anywhere | Complete gas leak | Urgent repair, food will be lost |
| The compressor hums and clicks, but does not start | Clogged capillary or compressor breakdown | Diagnostics of pressure in the system |
| Ice in the freezer, warm in the refrigerator | Partial leak or blockage | Defrost for 24 hours, then call a technician |
If you notice that the technical compartment (where the motor) heats up unevenly or, conversely, remains cold when the motor is running, this is a sure sign of a circulation problem. In models Bosch and Siemens this can also be indicated by an indication on the display.
Faults of the compressor and start relay
The heart of the refrigerator is compressor. If it does not work correctly, the entire thermodynamics of the process is disrupted. It often happens that the compressor turns on, hums for a few seconds, then there is a click and it goes silent. After some 10-15 minutes, the cycle repeats.
Such “hiccups” indicate problems with the starting relay or the motor itself. A relay is a small mechanism that provides a starting impulse. If it burns out, the compressor cannot start at full capacity and no pressure is created in the system. As a result, the freezer can retain cold by inertia, but new cold is not generated.
In more complex cases, when the compressor works but does not create the required pressure (compression), it needs to be replaced. This happens when the valves inside the engine wear out. You can check the compression by disconnecting the tube at the outlet: if the gas flows in a weak stream, the motor has “died.”
Is it possible to replace the compressor yourself?
Replacing the compressor requires soldering copper tubes, using nitrogen for purging and a vacuum pump. Without a special tool, it is impossible to perform this work efficiently, and the risk of fire when soldering at home is very high.
For diagnostics, sometimes it is enough to listen to the operation of the unit. A uniform hum is normal. Intermittent, with a metallic clang or complete silence when the light is on - a sign of an electrical malfunction.
Failure of sensors and thermostats
Modern refrigerators, be it Samsung or Whirlpool, are crammed with electronics. Sensors (thermistors) are responsible for temperature. If the sensor in the main compartment fails and shows the control module that, for example, +2°C (although in fact +15°C), the “brains” of the refrigerator will not give the command to cool.
In mechanical models, the thermostat is responsible for this. This is a simple “twist” with a tube that senses temperature. If the thermostat tube has lost sensitivity or the contacts inside have oxidized, the circuit does not close and the compressor does not start. Sometimes hitting or turning the regulator helps, but this is a temporary measure.
It is also worth mentioning the defrost sensor. In systems No Frost he makes sure that the evaporator does not freeze. If it is “lying”, the system may think that a defrosting process is in progress and turn off the fans or heating, which leads to ice accumulation and a cessation of air circulation.
Electronic control modules also tend to fail. Power surges in the network often lead to burnt tracks on the board. In this case, the refrigerator may behave chaotically: sometimes it freezes, sometimes it doesn’t, or there are errors on the display.
Problems with ventilation and the No Frost system
If you have a model with No Frost, then the lack of cold in the upper compartment when the freezer is running is often associated with the fan. It could simply freeze in the ice or its bearings could wear out. The fan must drive cold air from the freezer into the refrigerator compartment through special air ducts.
It often happens that these same air ducts become clogged with snow and ice. This happens if the defrost system is not working correctly. The ice blocks the path of air, and the cold flow remains below, in the freezer, and warm air stands above.
You can check the operation of the fan by opening the freezer door (in some models you need to press a special lever-door sensor, simulating closing). If there is no sound of operation, and the chamber is quiet, the fan is not spinning.
☑️ Diagnostics of the No Frost system
⚠️ Attention: In some models the air duct damper is controlled separately with a motor. If it is jammed in the closed position, the cold will not physically enter the main compartment, even if the fan is working properly.
The tightness of the door and other factors
You should not discount banal leaks. If the rubber seal on the door of the main compartment is dry, torn or simply dirty, warm air constantly enters the chamber. The compressor may not be able to cope with such a volume of heat, creating the illusion of a breakdown, although technically it is working properly.
The location of the refrigerator also affects it. If it is located close to a wall or in a niche without gaps for ventilation, the compressor may overheat and go into protection without having time to cool the food. This is especially true for built-in models, where the requirements for ventilation of the box are strict.
Sometimes users themselves overload the shelves by placing hot pots or covering the air circulation holes with products. In systems with forced circulation, this is critical: air must move freely throughout the chamber.
FAQ: Frequently Asked Questions
Is it possible temporarily use the refrigerator if the main compartment does not work?
You can use it, but not for long. The food in the main compartment will begin to spoil after a few hours. The freezer will work in increased mode, which may lead to compressor failure. It is better to unload the products and do the repairs.
How much does the repair cost if you need to replace freon?
The cost consists of the work of the technician, the cost of gas and consumables. Prices may vary in different regions and services, but usually this is an average cost fault. The technician will tell you the exact amount after diagnosis.
Why did the refrigerator start working after defrosting, but a week later it stopped again?
This is a classic symptom of a clogged capillary tube or an incipient leak. Defrosting removes the ice plug temporarily, but the cause (moisture in the system or microcrack) remains. A full repair with purging of the system is required.
Does the compressor hum louder when it malfunctions?
Not always. Often, when there is a freon leak, the compressor works quieter than usual or, conversely, does not turn off at all, working for wear. A loud knock or clanging usually indicates mechanical destruction of the compressor components.