The situation when, instead of the usual cold, warmth begins to blow from the bowels of the unit, always takes you by surprise. This is the first and most alarming signal that cooling cycle has been broken and the equipment is running idle. The products in the chamber begin to quickly deteriorate, condensation or, conversely, melt water appears on the walls, and the compressor may hum without interruption or remain silent.
There can be many reasons for this behavior: from a banal overload of the freezer with fresh food to a serious breakdown compressor or leakage refrigerant. The problem cannot be ignored, since long-term operation in emergency mode often leads to expensive repairs or complete replacement of the device. In this article, we will analyze in detail why this happens and what to do first.
Primary diagnostics: defrost mode and overload
Before sounding the alarm and calling a technician, it is worth eliminating factors that do not require intervention in the technical part. Users often forget that modern models with the system No Frost periodically switch to automatic defrosting mode. At this moment Heating element it heats up to melt the ice on the evaporator, and the fan can briefly drive warm air through the chamber.
A simple overload may also be the cause. If you have just loaded several kilograms of fresh meat or berries into the freezer, the system will take time to cool this volume. During this period, the compressor operates at its maximum capacity, but the heat capacity of the products is still higher than the cooling power.
⚠️ Attention: If, after defrosting or loading the products, the temperature has not returned to normal within 4-6 hours, it is necessary to proceed to a more in-depth diagnosis.
It is important to check the tightness of the doors. The rubber seal could be worn out or dirty, which is why warm air from the room constantly enters the chamber. The temperature sensor detects an increase in degrees and causes the motor to work continuously, but due to the constant flow of heat, it still remains hot inside.
Refrigerant problems: freon leak
One of the most common technical reasons is leakage freon. The refrigerant circulates in a closed circuit, taking heat from the chambers. If a microcrack forms in the tubes or the weld is damaged, the gas begins to evaporate. Without a sufficient amount of freon, the refrigerator simply cannot cool, even if the compressor is humming properly.
Often a leak occurs in the foamed part of the body or in places where pipes are soldered, which is difficult to notice visually. One of the indirect signs is the lack of cold in one of the chambers (usually the freezer), while the other may work, but is not efficient enough. Also, swelling or yellow spots from oil may appear on the back wall if a leak occurs in the compressor area.
How does a technician look for a leak?
Specialists use the nitrogen pressure test method. They shut down the system, pump in high-pressure gas, and submerge the components in water or use a leak detector. The bubbles will indicate the exact location of the circuit damage.
Refill the system yourself impossible without special equipment and skills. Attempts to simply “add” freon without finding and eliminating the leak will only give a temporary effect, after which the gas will escape again. Complete evacuation of the system, soldering and precise filling by weight are required.
Faults of the compressor and start relay
The heart of the refrigerator is compressor. If it fails, the refrigerant circulation stops completely. Symptoms can be different: the engine hums, clicks, but does not start, or turns on for a few seconds and immediately stalls. In some cases, the compressor works, but does not create the necessary pressure to compress the gas.
Often the problem lies not in the motor itself, but in start relay. This is a small plastic block that fits over the compressor contacts. Over time, the contacts inside the relay oxidize or burn out, and it stops providing an impulse to start the engine. Replacing the relay is an inexpensive procedure and is often completed quickly.
- 🔊 Buzzing and clicking: The engine tries to start, the relay clicks, but no start occurs.
- 🌡️ Case heating: The compressor itself may be hot to the touch, which indicates overheating of the windings.
- 🔌 No reaction: The refrigerator is plugged in, the light is on, but the motor is silent.
If the compressor is burned out, its replacement requires qualified intervention, since it is necessary to resolder the copper tubes and observe oil and freon filling technology. In older models, it is sometimes easier to replace the entire unit than to change the motor.
Clogged capillary tube
Capillary tube - this is a thin copper channel in which a sharp expansion of the refrigerant and its cooling occurs. Due to its microscopic diameter, it is extremely sensitive to contamination. oil-paraffin plug or ice blockage may form in the system (if there is moisture in the system).
If clogged, freon cannot circulate in full. The pressure at the compressor outlet increases and at the evaporator inlet it drops. As a result, the refrigerator stops cooling, and the compressor works overload, trying to push gas through the obstacle. This condition is dangerous for the motor.
| Symptom | Probable cause | Characteristic sound |
|---|---|---|
| The refrigerator does not freeze | Completely clogged tube | The compressor hums, then silence |
| Weak cooling | Partial blockage | Continuous motor operation |
| Ice only at the entrance | Ice plug | Gurgling during defrosting |
To remove the blockage, technicians use high-pressure nitrogen blowing or special chemical solvents. At home, it is almost impossible to break through a serious blockage without the risk of damaging the tube.
Failure of electronics and sensors
In modern models with electronic control, the temperature is monitored thermal sensors and thermostats. If the sensor fails and transmits incorrect data to the control module (for example, it reports that the chamber is -20°C, although there is +10°C), the compressor simply will not turn on.
The control module itself or the system fan may also fail No Frost. If the fan does not spin, cold air is not forced into the chamber, but remains in the evaporator area. The user feels that heat is blowing from the air ducts, although the freezer may be frozen.
Electronics diagnostics require a multimeter to “test” the circuits. Often the fault is not visually visible: a burnt-out sensor looks the same as a working one. Replacement requires disassembling the internal panel of the refrigerator.
Violation of tightness and thermal insulation
If everything is in order with the technical part, you should pay attention to the physical condition of the chambers. Damage to the interior plastic, bulging back wall, or peeling insulation can cause heat to enter. This is especially true for refrigerators with a No Frostsystem, where air flow is important.
A common problem is door misalignment. If the door is skewed, it will not fit tightly even with a working seal. You can check this with a sheet of paper: clamp it between the door and the body around the perimeter. If the sheet is pulled out without resistance, the tightness is broken.
☑️ Diagnosis of tightness
Frequently asked questions (FAQ)
Is it possible to operate the refrigerator if it blows warm air?
It is strictly not recommended. Products will quickly deteriorate, and the compressor, running idle or in overload mode, may burn out. It is better to turn off the device until the reasons are determined.
How long does it take the refrigerator to restore the temperature after defrosting?
Usually the process takes from 2 to 6 hours depending on the volume of the chambers and the number of products. If after 8 hours there is no cold, look for a malfunction.
Why doesn’t the refrigerator turn on after defrosting?
Perhaps the thermal protection relay has tripped or the thermostat has failed. It is also worth checking whether the water in the tray has dried up and whether moisture has got on the electrical contacts.
Is a freon leak dangerous to health?
Modern refrigerants (isobutane, R series freons) in small quantities contained in a household refrigerator are not toxic to humans, but require ventilation of the room. However, old freons can be harmful.