The situation when food freezes to stone in the freezer compartment, and warmth reigns in the refrigerator compartment, is familiar to many owners of household appliances. This is not just discomfort, it is a signal that refrigerant circulation has been broken and the system has stopped working normally. Most often, the problem lies not in a complete breakdown of the compressor, but in an imbalance in the distribution of cold.
This symptom cannot be ignored, since over time the situation may worsen until the unit completely fails. You need to understand the physical essence of the process: cold is generated precisely in the evaporator, which is most often located in the freezer area, and from there it must flow into the main compartment. If this does not happen, it means that there is an obstacle in the path of the cold or a leak of the working fluid has occurred.
In this article we will analyze in detail the mechanical and electrical causes of the malfunction, and also discuss what steps you can take yourself, and when it is better to call a specialist. Self-diagnosis will help save time and money if the problem turns out to be trivial.
⚠️ Attention: If you notice that the compressor is running non-stop without turning off for rest, this can lead to overheating and burnout of the windings. In this case, it is better to temporarily turn off the equipment until a specialist arrives.
Freon leakage as the main cause of temperature imbalance
The most common and serious reason why the refrigerator does not cool well in the upper compartment when the freezer is running is a partial leak of refrigerant. Freon (R600a or R134a) circulates in the system, which, as it evaporates, takes away heat. When its quantity decreases, the cold reserve is only enough for the first section of the evaporator - just in the area of the freezer.
The cooled gas simply does not reach the main compartment of the refrigerator. You may notice that the back wall inside the chamber has become warm or only slightly cool, whereas normally it should be uniformly cold. Compressor at the same time, it can work in an enhanced mode, trying to reach the set temperature, but due to a lack of freon, this is impossible.
Leakage often occurs in places where pipes are soldered or due to evaporator corrosion, especially if you have ever tried to defrost the unit with a knife or sharp object. Repair in this case is complex: you need to find the leak, solder it, evacuate the system and refill with gas.
How does the technician determine the leak?
The technician uses a leak detector or soap solution to look for air bubbles at the joints. It is impossible to notice a leak visually, since freon is a colorless and odorless gas.
Malfunction of the thermostat or temperature sensor
The second most popular reason is failure thermostat (in mechanical models) or temperature sensor (in electronic control systems). These elements are responsible for monitoring the temperature inside the chamber and sending a signal to turn the motor on or off.
If the sensor “lies” and shows that it is already too cold in the refrigerator, the compressor simply will not turn on to cool the main compartment, although the temperature in the freezer can be maintained inertially or due to residual cold. In models with the system No Frost the sensor controls defrost cycles and fan operation.
Replacing the thermostat is a relatively inexpensive and quick procedure. In electronic models, it is often necessary not only to replace the sensor, but also to reflash or diagnose the control board, which may have received erroneous data from a faulty sensor.
- 🔍 Symptom: The compressor turns on rarely or does not turn on at all, although the chamber is warm.
- 🔍 Symptom: Indicators on the control panel blink or show error.
- 🔍 Symptom: Food in the refrigerator compartment spoils, despite the motor running.
Problems with the defrost system in No Frost refrigerators
In units with technology No Frost the situation when the freezer is freezing, but the refrigerator compartment is warm, often indicates a system malfunction defrost. Ice builds up on the evaporator, which is hidden behind a plastic panel, and blocks the channels through which the fan should drive cold air into the main chamber.
As a result, the fan spinning idledrives air inside the freezer, but the cold does not enter the upper compartment. The cause may be a burnt-out defrost heating element, a faulty defrost relay, or the same sensor mentioned above. Visually, you may not see the ice, since it is hidden.
To confirm the diagnosis, partial disassembly of the back wall inside the freezer is often required. If there is a “coat” of ice several centimeters thick, it means that the defrosting system is not coping with its task.
☑️ Diagnostics of the No Frost system
Clogged capillary tube or filter drier
Another technical the cause of the refrigerant circulation disturbance is clogging. The cooling system has a very narrow capillary tube through which freon flows under pressure into the evaporator. If moisture or debris gets into the system (for example, due to poor-quality previous repairs), an ice or dirt plug forms.
Freon cannot circulate freely along the circuit. The pressure rises in one area and falls in another. The freezer can work because it is located closer to the beginning of the circuit, and the refrigerant reaches the refrigerator compartment in insufficient volume or does not reach it at all.
To fix this problem, you need to call a technician. He will purge the system with nitrogen, replace filter drier and fill the refrigerator with new freon. It is impossible to remove the blockage on your own without special equipment.
| Symptom | Probable cause | Difficulty of repair |
|---|---|---|
| The compressor is hot, works without stops | Freon leak | High |
| Ice on the back wall of the freezer | Faulty defrost system | Medium |
| The compressor is silent or clicking | The thermostat or start relay is faulty | Low |
| The refrigerator either freezes or not | Clogged capillary tubes | High |
Mechanical damage and improper operation
Sometimes the reason is trivial and lies in the actions of the user himself. If you recently washed the refrigerator, defrosted it, or simply slammed the door hard, it could be damaged seal. A loose fit of the door leads to a constant influx of warm air.
In this case, the compressor works hard, trying to cool the volume, but due to the heat inflow, the cold “evaporates.” First of all, the temperature rises in the refrigerator compartment, since it is less airtight in design and has a larger heat exchange area with the room.
It is also worth checking whether the products have blocked the ventilation holes inside the chamber. In modern models air circulation it is critically important, and if you place a large pan directly at the outlet of the cold stream, it will become warm in the depths of the chamber.
⚠️ Attention: When defrosting, never use a knife or other sharp objects to chip ice. One careless movement can puncture the evaporator, which will lead to an instant leak of freon and expensive repairs.
Diagnostics and procedure for the owner
What to do if you are faced with the problem described? First of all, carry out a visual inspection and audio diagnostics. Listen to whether the engine is running and whether there are any extraneous knocks. Check whether the light inside is on and whether the door is closed tightly.
If the refrigerator is working but not cooling, try defrosting it completely within 24 hours (at least 10-12 hours). This will help if the problem was a “snow coat” due to a defrost failure. If after switching on the problem recurs a few days later, it’s a technical issue.
Do not try to open the sealed parts of the circuit yourself or change the compressor without skills. Working with refrigerants requires a license and special equipment. Your task is to correctly describe the symptoms to the technician.
Why did the refrigerator work after defrosting, but after a week it stopped again?
This is a classic sign of a malfunction of the defrost system (the heating element burned out or timer). During manual defrosting, you removed the ice and the cold returned to the chamber. But since the automatic system does not work, the ice builds up again and blocks the channels.
Is it possible to temporarily use a refrigerator if it does not cool well?
It can be used, but with restrictions. Food may spoil faster. However, prolonged operation of the compressor without turning off (due to the fact that it cannot reach the temperature) will lead to its overheating and eventual combustion.
How long should the compressor work normally?
In normal mode, the compressor operates cyclically: it works for about 15-20 minutes and rests for 20-30 minutes. The operating coefficient depends on the temperature in the room and the load on the refrigerator, but it should not work continuously for days.
Does the amount of food affect cooling?
Yes, an empty refrigerator cools worse, since food serves as cold accumulators. However, an excess amount of food that blocks the air flow also disrupts the temperature regime.