The situation when there are petrified products in the freezer, and room temperature reigns in the refrigerator compartment, is a classic scenario failure of modern refrigeration units. Owners of equipment are often faced with bewilderment, believing that if the compressor is humming and the ice is freezing, then the rest of the body must also be cooling. However, the physics of operation of single-compressor and two-compressor systems is more complex, and the lack of cold in the main chamber with a working freezer indicates a specific list of malfunctions.
In most cases, the problem lies not in a complete stop of the unit, but in a violation of the circulation of the refrigerant or a malfunction in the temperature control system. Heat transfer between the chambers may be damaged due to blockage, freon leakage or failure of electronic components. It is important to understand that ignoring this symptom in the first hours can lead to spoilage of products, and in the long term - to the failure of an expensive compressor due to idle operation.
Before calling a technician or disassembling the unit, it is necessary to carry out initial diagnostics to eliminate common operating errors. Often the reason lies in a door that is not tightly closed or the thermostat settings are off. In this article we will analyze in detail the technical reasons why refrigerator compartment stops cooling, and which components require your attention first.
Problems with refrigerant circulation and blockages
One of the most common causes of imbalance temperature is a violation of refrigerant circulation. In systems No Frost and drip refrigerators, freon moves in a closed circuit, passing through the evaporator, compressor and condenser. If an obstacle occurs in any part of this line, the refrigerant cannot fully transfer the cold to the upper chamber.
The so-called “ice plug” is often encountered. This phenomenon occurs when moisture that has entered the system freezes in a narrow place in the capillary tube, completely blocking the freon flow. As a result, the pressure in the system drops, the compressor works, the freezer (where the main evaporator is located) still keeps cold by inertia or due to residual pressure, but the cold simply does not reach the main compartment.
Another option is that the system is clogged with oil breakdown products or debris remaining after poor-quality repairs. In this case capillary tube it becomes clogged, and the heat transfer efficiency drops to zero. Diagnosis of this condition requires professional equipment, since it is impossible to visually determine the location of the blockage without opening the sealed tubes.
⚠️ Attempts to independently break through the ice plug by defrosting during the day can only help in 30% of cases. If the problem is a chemical blockage or mechanical damage to the tube, defrosting will not give a result, but will only worsen the oxidation of the internal walls.
Malfunctions of the defrost system (Defrost)
For owners of refrigerators with the system No Frost this reason is a priority. The operating principle of such models involves periodically turning on the heating element to melt the ice on the evaporator. If one of the elements of this chain fails, the evaporator becomes overgrown with a “fur coat” that blocks the ventilation ducts.
Cold air physically cannot enter the refrigerator compartment, remaining locked in the freezer compartment. As a result, the fan may hum, trying to push air through, but the flow will be blocked by the ice mass. The main culprits for this situation:
- ❄️ Burnt out Defrost heating element —the heating element has stopped heating and the ice does not melt.
- ❄️ The defrost sensor is faulty - it does not give a signal to turn on the heating or, on the contrary, it does not allow you to turn it off in time.
- ❄️ The thermal relay has failed - the protective mechanism that opens the circuit when overheated could have worked falsely or burned out.
You can diagnose the problem by paying attention to the operation of the fan. If you hear it turn on and off for a short time, or it hums but no air flows, the ducts are most likely clogged with ice. In some models Indesit or Atlant with such a malfunction, ice may also freeze on the back wall of the freezer.
☑️ Diagnostics of the No Frost system
Freon leak: signs and consequences
Refrigerant leak - This is an insidious malfunction that develops gradually. Unlike a sudden compressor failure, if there is a leak, the refrigerator continues to operate, but its performance decreases. At first, you may notice that the compressor begins to turn on more often and work longer, trying to reach the set temperature.
When the amount of freon becomes critically small, it is only enough to cool the evaporator in the freezer, since it is located closer to the beginning of the cycle or has priority in some connection schemes. The refrigerant simply does not reach the refrigeration compartment in the required volume or condition, and it becomes warm there.
The main places where leaks most often occur:
- 🔍 Places where tubes are soldered - a poor-quality seam can crack from vibration.
- 🔍 Evaporator - especially in models with a foamed evaporator, where corrosion eats away the tubes from the inside.
- 🔍 Door heating circuit - thin tubes running around the perimeter of the door often fray or rust.
How to find a leak without equipment?
If you see oily spots under the refrigerator or on the back grille, this is a sure sign that compressor oil has leaked out along with freon. In areas of freon leakage, oil remains on the surface.
It is important to note that refilling the refrigerator is a temporary measure. If the leak is not found and repaired, the gas will come out again within a few weeks or months. Therefore, if a leak is suspected, a comprehensive repair is required, including searching for the fistula and overcooking the circuit.
Failure of the compressor and start relay
The compressor is the heart of the refrigerator, and its incorrect operation directly affects the distribution of cold. In a situation where the freezer works but the refrigerator does not, it is often not the motor itself that is to blame, but its start relay or windings. If the compressor does not develop enough power, the freon pressure is not enough to pump through the entire circuit.
Signs of problems with the compressor unit:
- 🔊 The compressor turns on for a few seconds, clicks and turns off.
- 🔊 The motor hums, but does not start (jamming).
- 🔊 The compressor housing heats up unevenly or too much.
In two-compressor models, the situation is simpler: if one compressor (responsible for the fridge compartment) fails, then the freezer will work independently. In single-compressor models, motor failure usually stops cooling everywhere, but a partial loss of power (for example, an interturn short circuit) can give the described “warm-cold” effect.
Electronics malfunctions and thermostats
Modern refrigerators are controlled by complex electronics. If you have an electronically controlled model, then control moduleis responsible for the distribution of cold. It receives data from temperature sensors and gives commands to open the dampers or turn on the compressor.
In mechanical refrigerators, the thermostat is responsible for turning the compressor on and off. If its sensitive element (bellows tube) has moved or the thermostat itself is stuck, the compressor may not turn on on time, or, conversely, it may work without interruption, but distribute the cold incorrectly.
In systems with an air damper (damper), the problem may be that the damper itself is jammed. The damper motor could burn out, and it would remain in the closed position, preventing cold air from the freezer from entering the upper compartment. This is a common problem in models LG i Samsung.
Symptoms of electronic failure:
- 📟 Error codes are displayed on the display (for example, F1, E2 or flashing indicators).
- 📟 The refrigerator does not respond to changes in temperature settings.
- 📟 Random switching on and off of the unit.
Comparison table of faults
To quickly identify the possible causes, we offer a summary table that will help narrow down the search for the problem. Pay attention to the accompanying symptoms, they often say more than the main diagnosis.
| Symptom | Probable cause | Difficulty of repair | Required equipment |
|---|---|---|---|
| Freezer it’s freezing, the refrigerator is warm, the compressor is silent | The thermostat or sensor is faulty | Low | Multimeter |
| The compressor is humming, but there is no cold anywhere or weak | Freon leak or blockage | High | Vacuum pump, freon |
| There is ice on the back wall of the freezer, there is heat in the chamber | Failure of the defrost system (No Frost) | Average | Tester, hair dryer |
| The compressor clicks and turns off | Faulty start relay | Low | Replacement relay |
| The refrigerator runs non-stop | Leakage or loss of compressor power | High | Pressure gauges |
What to do: algorithm of actions before the technician arrives
If you encounter the problem described, do not panic. Food safety is the most important thing now. First of all, assess the amount of loss: if the chamber is already at room temperature, it is better to transfer the food to another place or process it.
Next, completely defrost the refrigerator. This is a universal tip that helps in 40% of cases, especially if the problem is caused by a defrost system failure or an ice block. Unplug the appliance, open all doors and leave it for at least 12-24 hours. Do not use a hairdryer or knife to chip ice - this may damage the evaporator.
After defrosting, turn on the refrigerator and let it run for a couple of hours without loading food. If the cold appears and the operating mode (on/off) has stabilized, you are lucky, the system has recovered. If after 3-4 hours it is still warm in the main chamber and the compressor operates continuously, you need to call a specialist.
⚠️ Attention: Technical characteristics and location of components may vary depending on the model and year of manufacture. Always check the manufacturer's official instructions before disassembling the components yourself.
FAQ: Frequently asked questions
Is it possible to operate the refrigerator if the upper chamber does not freeze?
Operation is possible only for a short time, until defrosting or the arrival of a technician. Long-term operation in this mode (especially if the compressor does not turn off) will lead to overheating of the motor and its combustion. In addition, bacteria will begin to multiply in a warm chamber.
Why did the problem appear again a week later after defrosting?
This is a sure sign of a malfunction of one of the components of the defrost system (heating element, sensor or relay). Defrosting removed the ice, but did not eliminate the cause of its formation. Without replacing the faulty part, the ice will block the channels again.
How much does the repair cost if you need to replace freon?
The cost consists of the work of the technician, the cost of the refrigerant and finding a leak. This is usually one of the most expensive types of repairs, as it requires evacuation of the system and refilling under pressure. The exact price can only be found out after on-site diagnostics.
Does hot weather in the room affect the operation of the refrigerator?
Yes, if the room is hot (above +30°C), the refrigerator operates under increased load. In combination with a faulty defrosting system or a small leak, this can provoke the problem described when the unit does not have time to freeze both chambers.