The situation when refrigerator compartment stops cooling, while the freezer continues to operate normally, is one of the most common and at the same time confusing problems for owners of household appliances. You open the door hoping to get a cold drink, but are faced with room temperature, even though the ice in the freezer is solid. This behavior of the equipment often indicates specific disturbances in the refrigerant circulation system or failures in the control electronics.
Unlike a complete failure of the device, when both the light and the compressor are silent, partial loss of cold requires a more in-depth diagnosis. This does not always mean expensive repairs, but the problem cannot be ignored, as food will begin to deteriorate within a few hours. Understanding the operating principles of single-compressor or double-compressor systems will help you quickly navigate the causes of failure.
Modern units, be it Indesit, Atlant or LG, are designed so that the cold is distributed unevenly during various malfunctions. Before calling a technician, it is worth conducting an initial visual inspection and eliminating trivial operating errors, which often simulate a serious breakdown.
No Frost system malfunctions and problems with defrosting
In systems No Frost cold is produced in the evaporator, which is usually hidden behind a plastic panel in the freezer, and then the fan disperses this air throughout both compartments. If you hear the motor running but the cold doesn't reach the top, the problem is often a defrost cycle problem. A “coat” of ice grows on the evaporator, which blocks the air channels, and cold air simply cannot physically enter the refrigeration compartment.
The main culprits for such blocking are Defrost heating element, thermostat or timer (in old models) / electronic module (in new ones). When the heating element burns out, the ice does not melt, the channels become clogged, and circulation stops. Visually this may not be noticeable until you get to the hidden evaporator.
⚠️ Attention: If you decide to defrost the refrigerator manually to check, do not use sharp objects to chip the ice inside the cabinet. Damage to the evaporator tubes will lead to a freon leak, which will require complex and expensive repairs.
It is also worth checking the operation fan. If its blades are frozen to the body due to ice or the motor is burned out, the air will not circulate. In some models, when the fan is not working, the compressor may run idle, quickly wearing out.
Leakage of refrigerant (freon) as the main reason
One of the most common technical reasons why refrigerator stops maintaining the temperature in the upper compartment when the freezer is running, there is a partial leak freon. The refrigerant circulates in a closed circuit: first it passes through the freezer chamber, giving off some of the cold there, and then enters the main compartment. If the amount of gas in the system has decreased, it is simply not enough for the entire volume, and it only “reaches” the first stage - the freezer.
Leaks often occur in places where pipes are soldered or in the foamed part of the body, where the metal corrodes over time. This is especially true for models where the door perimeter heating circuit is made of a steel tube that rusts. It is almost impossible to notice a leak visually, since freon is a colorless and odorless gas.
Only a technician can diagnose a leak using a leak detector or a pressure gauge station. On your own, you can only indirectly confirm the guess: if, when the compressor is running, the condenser (grid at the back) remains only partially cold or warm, and the chamber is warm, the likelihood of a leak is high.
Is it possible to refill freon yourself?
Refilling it yourself is impossible and dangerous. This requires evacuation of the system, precise dosage of the refrigerant weight (up to a gram) and special equipment. An attempt to “just add gas” without eliminating the cause of the leak will lead to a repeat breakdown in a few days or weeks.
Clogged capillary tube
Another technical malfunction that simulates symptoms of a leak is clogged capillary tube. This is the thinnest copper tube in which throttling (sharp expansion) of freon occurs, which causes cooling. If there is moisture in the system, it turns into an ice plug, or oil oxidation products and compressor chips get there, the permeability of the tube is disrupted.
When clogged, the compressor works constantly, trying to pump freon, but the pressure is not enough for normal cooling. The freezer may freeze slightly or normally if the plug is located closer to the exit and the refrigerator compartment is warm. Often, you can hear an unusual gurgling sound or a complete absence of sound of liquid flowing.
To eliminate this problem you need:
- ⚙️ Blowing a high-pressure nitrogen system to remove the plug.
- 💧 Replacement filter-drier, which must be changed whenever opened circuit.
- 🔄 Refilling with a new portion of refrigerant after evacuation.
It is important to understand that it is impossible to simply “break through” the blockage without replacing the filter-drier, since moisture and dirt will soon cause re-blocking or damage compressor.
Compressor malfunction and loss of performance
Compressor is the heart of the refrigerator, which circulates the refrigerant. Over time, its mechanical part wears out and it loses its ability to create the necessary pressure. In this state, it can hum and vibrate, but not “pump” freon with the required force. This pressure is enough to cool a small freezer, but there is not enough power for the large volume of the main compartment.
Often owners confuse this failure with a leak, since the symptoms are identical. You can tell the difference by the operating time: if there is a loss of performance, the compressor may work non-stop, trying to gain temperature, but not reaching it. Also, the motor housing may be hotter than usual.
There is a table of signs that helps differentiate the problem:
| Symptom | Freon leakage | Capillary clogged | Wear compressor |
|---|---|---|---|
| Motor operation | Works intermittently | Works constantly | Works constantly, may hum |
| Condenser temperature | Barely warm or cold | Hot before the blockage, cold after | Warm, but uneven |
| Sound when turned off | Quiet hissing | Sharp whistle or clap | Normal sound |
| Freezer | Freezing, but weakly | Freezing normally or weakly | Freezing, but does not freeze |
Problems with electronics and temperature sensors
In modern electronically controlled models (Electrolux, Bosch, Samsung), electronic moduleis responsible for the distribution of cold. It reads temperature sensors and tells the compressor and dampers when to turn on. If the sensor in the refrigerator compartment “lies” and shows the module that it is already -10°C (although in fact it is +15°C), the module simply will not give the command to cool.
Also often fails damper (damper), regulating the flow of cold air. It may become stuck in the closed position due to frozen ice or drive failure. As a result, the cold remains in the freezer, but does not enter the main compartment.
Checking the electronics includes:
- 🔌 Ringing temperature sensors with a multimeter for resistance compliance.
- 👁️ Visual inspection control board for swollen capacitors or traces of burning.
- ❄️ Check of the mechanical movement of the air duct damper.
Sometimes a failure in the control module software can lead to incorrect work. In such cases, resetting the settings or flashing the firmware helps, but only service engineers can do this.
Operating rules and common mistakes
Before you panic and look for the service center number, make sure that you have not violated simple operating rules. Often “breakage” is the result of improper use. For example, if you have just placed a large amount of warm food in the chamber, the refrigerator may not be able to cope with a sudden change in temperature, especially if the door has been open for a long time.
Check the tightness rubber seal along the perimeter of the door. If it is dirty, dry or deformed, warm air constantly enters the chamber. The compressor tries to compensate for the heat, but its power is not enough for the entire volume, and the area with less intense cooling - the refrigeration compartment - suffers first.
☑️ Initial check before calling a technician
⚠️ Attention: Do not install the refrigerator close to the wall. For normal operation of the condenser, a gap of at least 5-10 cm is required. Overheating of the rear wall due to poor ventilation can lead to the compressor being turned off by the thermal relay or to its breakdown.
Also pay attention to the position of the temperature regulator. In some mechanically controlled models, one thermostat controls both compartments. If it is set to minimum, there may not be enough cold. Try changing the settings and wait a few hours.
Frequently asked questions (FAQ)
Is it possible to continue using the refrigerator if it does not freeze, but is humming?
It is not recommended to operate the equipment in this mode. If the cause is a freon leak, the compressor will work non-stop, trying to gain temperature, which will lead to overheating and burnout of the windings. Repairs will become significantly more expensive. If the cause is a blockage, the situation is similar. It is better to turn off the device and products until the technician arrives.
How long does it take to repair a freon leak?
Usually repairs take from 2 to 4 hours, unless the compressor itself needs to be replaced. The technician must find the leak (which may take time), solder it, replace the filter drier, evacuate the system and charge new freon. In difficult cases, when the leak is in the foamed part of the housing, repairs may be considered economically unfeasible.
Why did the refrigerator start working normally after defrosting, but after a week it stopped working again?
This is a classic symptom of a clogged capillary tube or a malfunction of the defrost system. During manual defrosting, the ice plug melts and the system temporarily starts working. However, the reason (moisture in the system or a burnt heating element) does not go away, and after some time the ice or plug forms again.
Is it possible to replace the compressor yourself?
Theoretically, it is possible if you have the skills to solder copper pipes and special equipment (vacuum pump, pressure gauges, scales). However, without a license to work with refrigerants and deep knowledge of thermodynamics, there is a high risk of damaging a new expensive unit or creating an explosive situation. It is better to entrust the replacement of the compressor to professionals.