The situation when in the freezer food freezes to stone, and in the main compartment of the refrigerator food begins to spoil or milk turns sour, is one of the most common and frightening problems for the owner. This is a classic symptom indicating poor refrigerant circulation or a malfunction in the temperature control system. Many users mistakenly believe that if the compressor is humming and the freezer is cold, then the equipment is working properly, but this is not the case.
The refrigeration circuit is a closed system where freon passes through the evaporator, compressor and condenser. If an obstruction or leak occurs in one of the sections of this circuit, the distribution of cold is disrupted. First of all, the zone with the least heat transfer or the greatest distance from the cold source suffers, which in two-chamber models often leads to the described temperature imbalance.
Understanding the physical processes occurring inside the unit will help you quickly diagnose the problem and avoid unnecessary expenses on calling a technician for basic adjustments. However, in some cases, ignoring the symptoms can lead to complete breakdown compressor of operation, so you need to respond promptly to changes in temperature conditions.
⚠️ Attention: Operating a refrigerator with disturbed temperature conditions can lead to food spoilage and the growth of bacteria. If you notice that the products in the main chamber have stopped cooling, temporarily move them to a colder place or use additional sources of cold until the problem is eliminated.
Principles of operation of two-chamber refrigerators
To understand why a temperature imbalance occurs, it is necessary to briefly consider the design of modern refrigerators. Most dual-compartment models use one compressor and one refrigeration circuit, where the cold is generated in an evaporator, usually located in the freezer, and then distributed throughout the refrigerator compartment. This process can be carried out by natural convection or forced by a fan in systems No Frost.
In systems with drip defrosting, cold air falls down the back wall, cooling the food, and then flows into the gutter. If the circulation is disrupted, the cold remains in the upper part or only in the freezer. In systems No Frost the fan must drive cold air from the freezer into the refrigerator compartment through special channels. If this mechanism is blocked by ice or fails, the refrigerator compartment stops receiving the required portion of cold.
The key element here is thermostat or the electronic control module, which reads the temperature sensors. If the sensor in the freezer is normal, the compressor may not turn on at full power or operate in short cycles, which is not enough to cool the large volume of the main chamber. Also plays an important role freon, the quantity and pressure of which must strictly correspond to the technical parameters.
Problems with refrigerant circulation: leaks and blockages
One of the most common technical reasons why the freezer continues to freeze, but the refrigerator stops, is a partial leak of refrigerant or a clogged capillary tube. When freon leaks, its amount in the system decreases. Since the evaporator is primarily located in the freezer area, the remaining gas can only be enough to create low temperatures in this small volume.
When it reaches the refrigerator compartment, the refrigerant has completely evaporated and is not able to take away heat. As a result, the temperature on the shelves of the main chamber is kept at room temperature or slightly lower, but not sufficient for storing food. A characteristic sign of a leak is overheating of the condenser (rear grille or side walls) only in the initial part or, conversely, its complete coldness.
Clogging of the capillary tube is the formation of a plug from oil or moisture oxidation products inside a thin tube where freon throttling occurs. This creates excess pressure before the blockage and a vacuum after it. The compressor begins to work with increased load, trying to pump gas, but the circulation is disrupted. In such cases, you can often hear the unit humming louder than usual, and then abruptly falling silent due to the operation of the thermal relay.
- 🧊 Partial leakage of freon leads to the fact that there is only enough cold for the freezer.
- 🛑 Capillary blockage blocks the flow of refrigerant, causing overheating compressor and lack of cold in the second compartment.
- 🔧 Repair in both cases requires calling a technician, evacuation of the system and refilling with new freon.
It is impossible to independently repair a leak or break through a capillary blockage without special equipment (vacuum pump, pressure gauge station, scales for refilling). Attempts to simply add freon without finding and eliminating the leak will only give a temporary effect, after which the problem will return after a few weeks or months.
How does a technician determine a leak?
A technician uses a leak detector or a soap solution to find where the gas is escaping. Leaks often occur in the foamed parts of the case or in the places where the capacitor is soldered, which requires complex repairs involving opening the thermal insulation or installing an external radiator.
Faults of the defrosting system in No Frost refrigerators
In refrigerators with the system No Frost the problem “the freezer is freezing, the refrigerator is not very” often lies in a malfunction of the evaporator defrost system. Ice that accumulates on the evaporator during compressor operation must be periodically melted by a heating element (heating element). If this process is disrupted, the ice coat grows and blocks the channels for supplying cold air to the refrigerator compartment.
The fan, which should blow cold into the main compartment, either stops due to icing of the blades, or simply cannot blow air through the dense layer of ice. As a result, in the freezer, where the evaporator itself is located, the temperature remains low (sometimes even excessively low), and no cold enters the refrigerator compartment at all. The back wall of the refrigerator compartment may be dry and warm.
The defrost system includes several key components: Defrost heating element, defrost sensor (thermostat or thermal fuse) and timer or electronic control module. Failure of any of these elements leads to freezing of the evaporator. For example, if a heating element burns out, the ice will not melt. If the sensor is stuck, it will not give a command to turn on the heating.
☑️ Diagnostics of the No Frost system
Diagnostics often require partial disassembly freezer. A visual inspection may reveal a thick layer of ice obscuring the evaporator fins. If, after completely defrosting the refrigerator (for 24 hours with the doors open), the problem disappears for 5-7 days and then returns, this is almost guaranteed to indicate a failure in the defrosting system.
⚠️ Attention: Do not try to break off the ice with a knife or sharp objects! Damage to the evaporator tubes will lead to an immediate leak of freon and expensive repairs, which may not be economically feasible.
Fan and damper malfunctions
Another reason for the lack of cold in the main chamber when the freezer is working properly is a mechanical breakdown of the fan or air duct damper. In modern models, a damper (damper) regulates the amount of cold air coming from the freezer. It is controlled by a solenoid or motor. If the damper is stuck in the closed position, air simply does not enter the refrigeration compartment.
The fan can also fail electrically (the winding burned out) or mechanically (the bushings broke, the lubricant froze). On some models, the fan should stop when the door is opened. If the door sensor is faulty and “thinks” the door is open, the fan will not start and circulation will stop. You can check the operation of the fan by opening the door and holding the sensor (or opening the door in models where the fan runs constantly while the compressor is on).
Noise, humming or crackling coming from the freezer may indicate that the fan blades are touching ice or the housing. This often happens when ice builds up unevenly. In such cases, the fan may run jerkily or stop completely, which blocks heat exchange between the chambers.
| Symptom | Probable cause | Characteristic symptom |
|---|---|---|
| The fan hums, but does not spin | Ice jamming or bearing wear | A hum is heard, no air flow |
| The fan is silent | Open circuit, motor or door sensor burnt out | Complete silence when running compressor |
| There is cold, but weak | The damper is slightly open or the channels are clogged | The temperature in the refrigerator is +10...+15°C |
Replacing a fan or damper usually does not require complex equipment, but it does require accurate diagnosis. It is important to check not only the motor itself, but also its power supply circuit, since the problem may lie in the control board.
Malfunctions of the thermostat and sensors
The electronics of the refrigerator rely on the readings of temperature sensors. Dual-compartment models often use two main sensors: one controls the temperature in the freezer compartment, the other controls the temperature in the refrigerator compartment. If the sensor in the refrigerator compartment “lies” and shows that it is already quite cold there (for example, +2°C instead of the real +10°C), the compressor will not turn on for cooling.
In mechanical refrigerators, thermostatis responsible for this. Its sensing tube must be in close contact with the evaporator or chamber wall. If the tube has come loose, oxidized, or the thermostat itself has failed (contacts are stuck), the compressor power circuit does not close. As a result, the freezer gradually loses its cold, but due to inertia or a residual effect, it may seem that it is still freezing until it completely thaws.
In electronically controlled models (where the temperature is set in degrees on the display), the control boarditself may fail. Contact oxidation, a voltage surge or a software failure can cause the module to stop sending a signal to the compressor or fan, ignoring the real temperature in the chambers.
- 🌡️ A faulty temperature sensor gives false readings to the control module.
- ⚙️ A mechanical thermostat may lose the seal of the bellows with freon inside.
- 💡 The electronic module may “glitch” due to power surges in the network.
Diagnostics of the sensors is carried out using a multimeter in resistance measurement mode. The resistance of the sensor changes depending on the temperature. If, when the temperature changes, the device readings do not change or show an open/short circuit, the sensor must be replaced.
Influence of operating mode and external factors
The cause is not always a breakdown. Sometimes the user himself inadvertently creates conditions under which the refrigerator cannot cope with the load. 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 wears out, but the heat transfer efficiency drops, and there is no longer enough cold for two chambers at once.
Loading the refrigerator with warm foods can also cause a temporary imbalance. The huge mass of warm food in the main chamber will require a long time to cool. During this period, the freezer, having a smaller volume, will cool faster, creating the illusion that everything is fine with it, while in a large compartment the temperature will not drop to normal for a long time.
Tight fit of products to the back wall in models with a drip system or blocking of ventilation holes in systems No Frost is a common operating error. Cold air should circulate freely. If you pack the shelves to capacity and close all the gaps between products, ventilation is disrupted, and the temperature in different areas of the chamber may vary greatly.
⚠️ Attention: Do not install the refrigerator near heating appliances, a stove, or in direct sunlight. This creates an excessive thermal load, which the standard cooling system may not be able to cope with even in good condition.
Algorithm of actions when a problem is detected
If you are faced with a situation where there is ice in the freezer and warm in the refrigerator, do not panic. Be consistent. First, rule out simple causes: check if the air ducts are blocked by food, if the door closes tightly, if the refrigerator is not standing in the sun. Try to defrost the unit completely within 24 hours - this will help identify problems with the defrosting system.
If after defrosting the refrigerator worked normally for a week, and then the problem recurred, the problem is definitely in the defrosting system (heating element, sensor, timer). If the cold does not appear even after defrosting, or appears for a short time and disappears, a freon leak or blockage is likely. In this case, independent repair is impossible and you will need to call a specialist.
Pay attention to the accompanying signs: hot or cold condenser, unusual compressor noise, behavior of indicators on the control panel. All these details will help the technician quickly diagnose the problem over the phone and bring the necessary spare parts.
Sequence of actions:1. Check the tightness of the doors.
2. Inspect the back wall for distortions or damage.
3. Defrost the refrigerator for 24 hours.
4. Turn on and monitor the work for 2-3 days.
5. If it happens again, call the service.
Frequently asked questions (FAQ)
Is it possible to continue using the refrigerator if it is warm in the main chamber?
Short-term - yes, if you transfer perishable foods. However, long-term operation in this mode is dangerous for the compressor, which can work without stopping, trying to gain temperature, which will lead to its overheating and combustion.
Why did the refrigerator start working normally after defrosting?
This is a sure sign of a malfunction of the defrost system. Ice that you removed manually should normally be removed automatically. Most likely, the heating element, sensor or defrost timer burned out, and ice will accumulate again in 5-10 days.
How much does the repair cost if you need to refill with freon?
The cost consists of the work of the technician, the cost of freon and, possibly, replacing the filter-drier. Price may vary depending on model and complexity of system access. The technician will tell you the exact amount after diagnosis, since it is difficult to visually determine the amount of work.
Does seasonality affect the operation of the refrigerator?
Yes, in the summer, when the ambient temperature is high, it is more difficult for the refrigerator to give off heat. If the room is +30°C, operating efficiency drops and the compressor is forced to work longer. Make sure that the room where the refrigerator is located is not too hot.