The situation when it is warm in the main chamber of the refrigerator, food begins to spoil, and the freezing section continues to operate as normal, is one of the most common and insidious problems of household appliances. This behavior of the unit often confuses the owner, since the compressor seems to be humming, the light inside is on, but there is no desired cold. This does not necessarily mean a complete breakdown of the device, but it is absolutely impossible to ignore the symptom, because the lack of circulation of cold air in the upper compartment can lead to serious consequences for the motor.
Most often, the root of the problem lies in impaired refrigerant circulation or failures in the temperature control system. In modern models with the system No Frost air is pumped from the freezer into the refrigerator compartment through special channels, and if this process is disrupted, the upper part stops cooling. In devices with a drip defrosting system, the situation may be caused by a freon leak or a clogged capillary tube, which requires deeper intervention.
Before calling a technician or starting disassembly, it is necessary to conduct an initial diagnosis to understand the scale of the problem. Often the cause is a simple clogged drain hole or failure of one of the sensors, which sends an incorrect signal to the control module. Understanding how your model works will help you quickly locate the problem and avoid unnecessary repair costs.
1. Problems with air circulation in the No Frost system
In refrigerators equipped with the system No Frost, cooling of the main chamber occurs due to forced circulation of air, which is produced by the evaporator located in the freezer compartment. If you notice that your freezer is working great, but the refrigerator compartment is warm, the first thing you should pay attention to is the air dampers and fans. A mechanical obstruction or icing of the air ducts blocks the flow of cold, creating the illusion of a compressor breakdown.
Often the cause is a malfunction of the damper Air Damperwhich regulates the flow of cold air. If the damper is stuck in the closed position or the drive is broken, air simply does not enter the upper chamber. The culprit may also be a fan that has stopped rotating due to worn bearings or frozen blades. In this case, the evaporator continues to freeze, but the cold remains “locked” in the freezer.
⚠️ Attention: If you hear a noise or humming noise coming from the back wall of the refrigerator compartment, this may indicate that the fan is trying to start, but ice or a foreign object is preventing it. Do not ignore these sounds, as prolonged operation of the fan motor under load will cause it to burn out.
Fixing the problem often requires completely defrosting the unit for 12-24 hours. If after turning on the refrigerator began to cool normally, then the problem was ice freezing on the elements of the defrost system. If the situation repeats after a few days, it is necessary to check Defrost heating element, timer or defrost sensor.
☑️ Diagnostics of the No Frost system
2. Refrigerant leak and circuit failure
One of the most serious reasons why the refrigerator stopped freezing in the main chamber is a partial leak of refrigerant (freon). Unlike a complete leak, when the compressor runs constantly, but there is no cold anywhere, with a partial leak, the gas pressure is only enough to freeze a small volume - usually a freezer. The remaining refrigerant is not enough for a full cooling cycle of the entire volume of the refrigerator.
A leak can occur anywhere in the circuit: in the foamed part of the body, in places where pipes are soldered, or through the evaporator. If you notice that over time the freezer is less able to freeze or oily spots appear on the walls, this is a sure sign of depressurization. In such cases, compressor can work at short intervals or, conversely, without stopping, trying to gain temperature.
It is almost impossible to independently find the location of the leak without special equipment (leak detector). However, an indirect sign can be a hot rear wall (condenser grill), which heats up only in the upper part, while remaining cold at the bottom. This indicates that freon does not go through a full circle of circulation.
Repair in this case involves finding leaks, eliminating leaks and filling the system with new refrigerant. It is important to use exactly the brand of gas that is indicated on the technical sticker (usually R600a or R134a), since replacing one type with another without altering the system is prohibited.
Is it possible to refuel the refrigerator yourself?
Refilling the refrigerator yourself is highly not recommended. This requires a vacuum pump, a gauge station, a scale and soldering skills. Incorrect refueling (underfilling or overfilling) will lead to compressor failure within a short time. In addition, refrigerants can be flammable or toxic if mishandled.
3. Malfunctions of the control module and temperature sensors
Modern refrigerators are controlled by electronics that read readings from various sensors. If the main temperature sensor in the refrigerator compartment fails or begins to transmit distorted data (for example, that it is “too cold”), the control module simply stops sending a signal to open the damper or turn on the compressor to cool this area.
Often problems arise with the evaporator defrost sensor. If he is “lying,” the system may think that the evaporator has not yet frozen and does not turn on the heating element to defrost. As a result, the evaporator becomes coated with ice, blocking the airflow. It may also fail itself control modulewhere the tracks or relays responsible for a specific cooling circuit have burned out.
Diagnostics of electronic components requires a multimeter. It is necessary to “ring” the sensors for resistance and compare the readings with the reference values for your model. Errors are often displayed on the display in the form of codes (for example, E1, F5), the decoding of which can be found in the instructions.
| Component | Fault symptom | Check method | Probability breakdowns |
|---|---|---|---|
| Chamber temperature sensor | The refrigerator does not turn on or off | Measuring resistance with a multimeter | High |
| Defrost heating element | Ice build-up in the freezer, no cold in the chamber | Open circuit test | Average |
| Evaporator fan | Noise, lack of air circulation | Visual inspection and rotation check | Average |
| Control module | Chaotic operation, lack of response to buttons | Checking the output voltage | Low |
4. Clogged capillary tube and filter drier
Another technical reason why the refrigerator does not freeze well in the main chamber is a clogged capillary tube. There is a bottleneck in the freon circulation system - a capillary that creates the necessary pressure. If moisture, acid (oil decomposition product) or mechanical particles get into the system, the permeability of the tube is impaired.
If clogged, freon cannot circulate freely along the circuit. The compressor inlet pressure drops and cooling capacity drops sharply. Often in such cases, the freezer can still maintain the temperature due to residual cold or operating at maximum capacity, but the refrigerator compartment “floats”. A characteristic sign is that the condenser (grid at the back) is only partially warm or has a sharp heating limit.
Removing the blockage requires purging the system with nitrogen under high pressure and replacing filter-drier. The filter traps moisture and dirt, and if it is clogged, its capacity drops to zero. Trying to simply “push through” the blockage without replacing the filter will only give a temporary effect.
⚠️ Attention: Do not try to clean the capillary tube yourself by pumping freon or using chemical solvents without vacuuming. This can lead to water hammer in the compressor and its final failure. This procedure requires professional equipment.
5. Compressor wear and problems with the motor
Although the compressor is the “heart” of the refrigerator, its partial failure can also lead to the symptoms described. If the compressor has exhausted its service life, it may not create sufficient compression (pressure) to pump freon through the entire circuit. As a result, the gas circulates, but very slowly, managing to cool only a small circuit (freezer), but not effectively reaching the main evaporator.
You can determine the weakness of the compressor by the nature of its operation: it can turn on and off immediately (the thermal protection relay is triggered) or work constantly, but barely audible, without characteristic vibration. It is also worth checking the start protection relay - if it is faulty, the motor may hum but not start or start jerkily.
In some cases, the problem is solved by replacing the start relay or capacitor (if it is in the circuit), which is an inexpensive procedure. However, if the piston mechanism itself or the valves are worn out, the entire compressor will need to be replaced. This is a complex and expensive repair that requires soldering and vacuuming the system.
6. External factors and operating errors
The reason does not always lie in a breakdown. Sometimes users themselves create conditions under which the refrigerator cannot operate normally. For example, installing the unit close to a wall or in a niche without gaps for ventilation leads to overheating of the condenser. The compressor overheats and goes into protection without having time to freeze the chambers.
It is also important to take into account the ambient temperature. If the refrigerator is placed on an unheated balcony or in a garage at a temperature below +5°C (or above +32°C), the refrigerant may behave incorrectly and the oil in the compressor may thicken. As a result, the system does not reach operating mode.
Another factor is the dense loading of products. If the shelves are packed to capacity and the ventilation holes inside the chamber are blocked by pots or bags, cold air simply cannot circulate. In such cases, the freezer, which has its own separate circuit or is located closer to the source of cold, works, and the main chamber warms up.
The influence of the amount of food on the operation of the refrigerator
An empty refrigerator works less efficiently, since the products accumulate cold. However, overload disrupts circulation. It is optimal to fill the volume by 60-70%, leaving space between the food and the back wall for the free movement of air flows.
Frequently asked questions (FAQ)
Why, after defrosting, did the refrigerator stop cooling again after a couple of days?
Most likely, the problem is not excess moisture, but malfunction of the defrost system. If the heating element, timer or defrost sensor does not work, ice will build up again and again, blocking the air supply channels. Defrosting gives only a temporary effect until the evaporator is overgrown with a “fur coat” again.
Is it possible to operate a refrigerator if the freezer is working but the refrigerator compartment is not?
For a short time - yes, to save food. But prolonged operation in this mode is harmful to the compressor, which can work non-stop, trying to gain temperature. In addition, bacteria will begin to multiply in the main chamber, which will lead to the appearance of an unpleasant odor and damage to the equipment from the inside.
The sound of pouring water is heard, but there is no cold in the upper chamber - what is it?
This may indicate that the defrosting system is working (the ice is melting), but the water does not have time to evaporate or go into the drainage due to heavy ice, or it is the sound of freon circulation when there is a shortage (leakage). A technician's diagnostics are required.
Has the freon frozen in the tubes if the refrigerator has stopped freezing?
Freon does not freeze in the tubes at the operating temperatures of a household refrigerator. The term “freon frozen” is a myth. If the system does not work, it means that the freon has either escaped through a leak or does not circulate due to a blockage or breakdown of the compressor.
How to understand that the thermostat is faulty?
If the refrigerator does not turn on at all or, conversely, works without interruptions, without turning off, and the temperature inside does not correspond to the set one, there is a high probability of failure thermostat. In electronic models, this is solved by replacing the sensor; in mechanical models, by replacing the regulator itself.