The situation when the main chamber of the refrigeration unit stops cooling food, while the freezer continues to work properly, is one of the most common and at the same time alarming for the owner of household appliances. You open the door, expecting the usual cold, but are greeted only with room temperature, while the ice in the freezer hardens. This contradiction is often puzzling, because logic dictates that if one part of the system works, then the whole of it should function.
However, the design of modern refrigerators, be it Indesit, Atlant or Bosch, involves separation of air flows or the presence of separate cooling circuits. In systems with one compressor and one circuit, the problem often lies in a refrigerant circulation problem or a malfunction in the defrost system. In models with two compressors, the situation may indicate a failure of the very unit that is responsible for the positive chamber. Understanding these nuances is critical for correct diagnosis.
Before calling a technician, it is worth conducting an initial visual inspection to rule out trivial causes, such as a loose door or broken thermostat settings. Often, users accidentally switch equipment to the “vacation” or “super-freeze” mode, which disrupts the normal operating cycle. If the compressor runs continuously without stopping, and there is no cold in the main chamber, this is a sure sign of a freon leak or a clogged capillary tube.
No Frost system malfunctions and problems with air circulation
In refrigerators equipped with a system No Frost, the main chamber is cooled due to the forced circulation of cold air, which is generated in the freezer and supplied through special channels. If you hear the fan and compressor running, but no cold is coming in, the air ducts may have frozen or the damper has failed. The snow “coat” inside the housing blocks the passages, and the air simply cannot reach the products.
The damper, or damper, regulates the amount of cold air coming from the freezer. If the mechanism is stuck in the closed position, the main chamber will remain warm. This is a mechanical failure, which is often accompanied by a characteristic cracking or clicking sound when the system tries to open the damper. In some models LG i Samsung the damper is controlled electronically, and a failure in the control board may not send a signal to open.
It is also worth checking the condition of the fan. If its blades are frozen or the motor burns out, circulation stops completely. In this case, it will be very cold in the freezer, but warm at the top. This is often accompanied by the absence of the characteristic noise of a working fan, which is usually heard when the freezer door is open.
⚠️ Attention: Do not try to forcefully open the dampers or turn the fan blades with your hands when the appliance is plugged in. This can lead to damage to the plastic elements and injury.
Refrigerant leakage and problems with the capillary system
One of the most common reasons why a refrigerator does not freezeis a freon leak. The refrigerant circulates in a closed circuit, and if a microcrack forms in the tube, the gas gradually evaporates. As a result, the pressure in the system drops and the freon boils ahead of time, before reaching the evaporator of the main chamber. The freezer can still remain cold for some time due to residual refrigerant or inertia.
It is difficult to determine a leak visually, since the gas is colorless and odorless. However, an indirect sign may be a hot condenser (grid at the back) only partially, or, conversely, cold along its entire length. Also, swelling may appear on the tubes inside the freezer, indicating a depressurization area. In models with a foamed evaporator, leakage often occurs in the foamed part of the housing, which makes repairs economically difficult.
Another problem is Clogged capillary tube. Not only freon circulates in the system, but also compressor oil. Over time, clots may form in the oil and clog a narrow section of the tube. This creates a “plug” that prevents the refrigerant from flowing. The symptoms are similar to a leak: the compressor works, but there is no cold. Only a technician with a pressure gauge can distinguish a clog from a leak.
Is it possible to refill freon yourself?
Independent refilling is impossible without specialized equipment (vacuum pump, scales, pressure gauge station). In addition, before refueling, it is necessary to find and repair the leak, otherwise the gas will come out again after a short time. An attempt to simply “add gas” will lead to compressor failure.
Compressor malfunction: when the motor is “tired”
Compressor this is the heart of the refrigerator, creating pressure for the movement of freon. If it works but doesn't create enough pressure, the system won't freeze. This often happens when the windings are shorted between turns or the valve group is worn out. In this case, the motor hums and vibrates, but does not perform any useful work. It can get very hot and switch off via a thermal relay.
Sometimes the compressor starts for just a few seconds and clicks, followed by a pause. This indicates a start protection relay or that the compressor is stuck. If the unit is old, the wear and tear of the mechanical parts of the piston group leads to a drop in performance. In two-compressor models Liebherr or Electrolux it is the refrigerator compressor that may fail, while the freezer will continue to work.
It is important to listen to the nature of the engine. A steady hum followed by silence is the norm. An intermittent hum, an increasing buzz and a sharp click are signs of a malfunction. Long-term operation in this mode finishes off the motor, so at the first sign of a strange sound it is better to turn off the power to the device.
Failure in the defrosting system: heating element, timer and sensors
In systems No Frost regular defrosting is critically important evaporator. A chain of elements is responsible for this process: a timer (or electronic module), a defrost sensor and a heating element (Heating element). If the heating element burns out or the sensor “lies,” the ice on the evaporator does not melt, but grows. Sooner or later, a block of ice will block the air supply channels, and the cold will stop flowing into the main chamber.
You can diagnose this problem by inspecting the evaporator. If the problem returns after defrosting for 10-12 hours, then the defrosting system is not working. Often the one that fails is the one that should inform the module that a certain temperature has been reached to turn off the heating element. If it is faulty, the module may not turn on the heating at all. defrost sensor, which should inform the module that a certain temperature has been reached to turn off the heating element. If it is faulty, the module may not turn on the heating at all.
It is also worth checking the integrity of the wiring going to the heating element. In conditions of constant humidity and temperature changes, the contacts may oxidize or burn out. In some models Beko and Haier the thermal protection fuse of the heating element is blown, which also blocks the defrosting process.
☑️ Diagnostics of the defrost system
⚠️ Attention: When checking the heating element and sensors with a multimeter, be sure to disconnect the refrigerator from the power supply. Working with live electrical components is deadly.
Comparison table of symptoms and probable causes
To more accurately determine the malfunction, it is useful to compare the observed symptoms with the most likely breakdowns. Below is a table to help you navigate the situation before the technician arrives.
| Symptom | Probable cause | Difficulty of repair | Need for a technician |
|---|---|---|---|
| The compressor is silent, there is no light | No power, the socket or cord is burnt out | Low | No |
| Humming, but not freezing, warm condenser | Freon leak or blockage | High | Yes |
| Humming, clicking, hot | Faulty compressor or start relay | Medium/High | Yes |
| Freezing, but not much, ice in the chamber | Faulty defrost system (No Frost) | Medium | Desirable |
| There is cold, but weak, the compressor does not turn off | Compressor wear or leakage | High | Yes |
Problems with the thermostat and electronic module
Thermoregulator (thermostat) is responsible for turning the compressor on and off depending on the temperature in the chamber. If it is faulty and “does not feel” the heat, the compressor may not turn on at all, or, conversely, it may work non-stop, freezing everything in the freezer, but not being able to cope with the main chamber due to a violation of the cycle. In modern models, this function is performed by electronic control module.
A failure in the electronics can lead to the board not sending a signal to open the air damper or turn on the second compressor. Often such breakdowns are accompanied by blinking indicators on the control panel. In models Whirlpool and Ariston there are failures in the module firmware, which can be treated by flashing or replacing the board.
It is also worth checking the contacts of the thermostat itself. If the contact group has oxidized, the signal simply does not pass through. Replacing a thermostat is a simple procedure, but requires precise selection of an analogue, since the temperature range of operation differs for different models.
The influence of operating conditions and external factors
Sometimes the reason lies not in a breakdown, but in incorrect operating conditions. If the refrigerator is placed close to the wall, the ventilation of the condenser is disrupted. The motor overheats and goes into protection mode, not having time to reach the desired temperature. The location next to heating appliances or in direct sunlight is also critical.
Loading warm products in large volumes is another stress factor. The system may not be able to cope with sudden increases in temperature, especially if the door is slammed frequently. In winter, if the refrigerator is on an unheated balcony, the oil in the compressor thickens, and starting becomes impossible or dangerous for the engine.
The rubber door seal is an element that is often ignored. If it does not fit tightly, warm air constantly enters the chamber. The compressor works hard, trying to compensate for the heat influx, but due to the constant load, efficiency drops, and it becomes warm in the main chamber while the freezer is still holding its defenses.
How to check the seal?
Use a sheet of paper. Clamp it with the refrigerator door in different places around the perimeter. If the sheet is removed easily and without resistance, the seal is leaky in this place and requires replacement or adjustment.
Why does the refrigerator work, but does not freeze, although the compressor is hot?
A hot compressor in the absence of cold usually indicates that the motor is running, but freon is not circulating properly. This is a classic sign of a refrigerant leak or a clog in the capillary system. The pressure drops and the compressor runs “idle”, overheating.
Is it possible to operate the refrigerator if the upper chamber does not freeze?
For a short time - yes, if the food in the freezer does not defrost. However, prolonged operation in this mode is harmful to the compressor, which can burn out from overload or overheating. It is better to turn off the device and carry out diagnostics.
How long should defrosting last if there is a problem with No Frost?
It takes at least 24 hours for the ice in the hidden channels of the No Frost system to completely thaw. If you defrost less, the ice plug may remain, and after turning on the problem will repeat itself after a few hours.
Why, after defrosting, did the refrigerator stop freezing again after a day?
This is a sure sign of a malfunction of the automatic defrosting system. Ice accumulated again and blocked the channels. It is necessary to check the heating element, defrost sensor and timer (or control module).
Is it dangerous to add freon yourself?
Yes, it is dangerous and ineffective. Without searching for leaks and evacuating the system, the new freon will mix with air and moisture, which will lead to corrosion of the tubes from the inside and final breakdown of the compressor.