The situation when food turns to stone in the freezer, and room temperature reigns in the main chamber, is one of the most common and discouraging breakdowns. The user opens the door expecting cool air, but is faced with warm air, while the compressor can work continuously, creating the illusion that the unit is working properly. This is a clear sign that the cooling system is only partially functioning or is operating with serious disturbances in the circulation of the refrigerant.
Such temperature asymmetry most often indicates a malfunction No Frost systems, problems with the thermostat, or, in the worst case, a freon leak. There is no need to panic, since in many cases the problem can be diagnosed independently, without calling a specialist right away. However, the symptom cannot be ignored, because running the compressor idle can lead to its complete combustion and costly repairs.
In this article we will analyze in detail the mechanics of the process, explain why cold stops flowing into the upper chamber, and provide an algorithm of actions for checking the main components. Understanding the principles of operation of your refrigerator refrigerator
Fundamental differences in the operation of the chambers and the role of the refrigerant
To understand the essence of the breakdown, you need to briefly refresh your memory basic principles of operation of a two-chamber refrigerator. Unlike old models, where the evaporator was located in the freezer, and the cold was supplied upward by natural convection, modern units, especially with the No Frostsystem, use forced air circulation. The fan drives cold air from the evaporator located behind the rear wall, distributing it across both compartments through special channels.
If the freezer continues to freeze, this means that the process of generating cold (compression and expansion of freon) is occurring. The compressor is working, there is freon in the system (at least partially), and the evaporator is cooling. The problem lies precisely in the delivery of this cold to the refrigeration compartment or in controlling the temperature in this compartment. In models with a drip system ("crying cry"), the cold is transmitted through the wall, and a violation here is often associated with the formation of an ice coat.
⚠️ Attention: If you hear the liquid gurgling inside the housing or hissing, this may indicate movement of freon in the system. However, if these sounds are added to the complete absence of cold in the upper chamber for 12-24 hours, we are talking about a malfunction that requires intervention.
The key element here is thermostat or the electronic control module, which reads the sensor readings. If the sensor in the refrigerator compartment is “stuck” or gives incorrect readings, the “brain” of the refrigerator may consider that the temperature has already been reached and stop supplying cold there, continuing to cool only the freezer.
No Frost system: clogged air ducts and fan
In refrigerators with the system No Frost The main reason for uneven cooling is impaired air circulation. The cold is produced in a hidden evaporator, and then a fan blows it through the chambers through air ducts. If one of these elements fails or becomes blocked, the cold stops flowing into the refrigerator compartment, remaining in the freezer.
The first suspect often becomes fan. It may simply stop due to bearing wear or freezing. In this case, you will hear that the refrigerator is humming, but there is no characteristic blowing noise. Without forced air movement, cold, heavy air remains at the bottom in the freezer while the top remains warm. Also, the fan can be blocked by ice if the defrosting system has failed.
The second option is freezing air ducts. There are holes between the chambers through which air passes. If the drainage hole is clogged with debris or ice, the moisture does not leave, freezes and blocks the path to the cold flow. This can be checked visually by looking inside the chamber: if ice or frost is visible on the back wall, and not a smooth surface, it means that the defrosting system is not coping.
Problems with the thermostat and temperature sensors
The thermostat (thermostat) is a “watchman” who decides when to turn on the compressor and when to turn it off. In older models it is a mechanical “twist”, in new ones it is an electronic sensor. If the thermostat is faulty, it may send the wrong signal that the chamber is already cold enough, when in fact it is warm. As a result, the compressor either does not turn on at all or works only for the freezer (in models with two circuits).
In electronic control systems, temperature sensors are also responsible for the temperature. If the sensor in the refrigerator compartment is “lying,” the control module blocks the supply of cold to this compartment. This often happens after power surges or simply due to the aging of the element. Diagnosis of such problems requires a multimeter to check the resistance of the sensor at different temperatures. defrost sensors and temperature sensors. If the sensor in the refrigerator compartment is “lying,” the control module blocks the supply of cold to this compartment. This often happens after power surges or simply due to the aging of the element. Diagnosing such problems requires a multimeter to test the resistance of the sensor at different temperatures.
It is also worth mentioning the damper (damper), which regulates air flow. On some models it opens and closes automatically. If the damper is stuck in the closed position, cold cannot physically enter the upper chamber, even if the fan is working properly. This is a mechanical breakdown, often requiring replacement of the damper drive.
Freon leakage and capillary tube blockage
These are the most serious technical faults that are difficult to eliminate without special equipment and skills. If an accident occurs in the system, its quantity may only be enough to cool the first section of the evaporator (which is located in the freezer). The refrigerant simply does not reach the refrigeration chamber or it reaches it already warm. freon leak, its quantity may only be enough to cool the first section of the evaporator (which is located in the freezer). The refrigerant simply does not reach the refrigerator compartment or reaches it already warm.
Signs of a leak or clogged capillary tube are:
- 🌡️ The compressor works continuously, without turning off, trying to gain temperature.
- 🔊 Change in the sound of the motor (may become more strained or quiet).
- ❄️ The evaporator in the freezer is covered with frost unevenly or only at the entrance of the tube.
- 🔥 The rear wall of the refrigerator (condenser) remains cold or warm only partially.
If the tube is clogged (for example, moisture has entered and an ice plug has formed inside a narrow channel), the circulation of freon is disrupted. The pressure in the system drops and the cooling capacity decreases sharply. It is almost impossible to find the leak or clean the capillary on your own - the system must be evacuated and refilled with new freon.
⚠️ Attention: If you find an oily stain under the refrigerator or on the pipes at the back, this is a sure sign of depressurization of the system. The freon evaporated and the oil leaked out. It is impossible to operate such a unit - the compressor will burn out without cooling with oil.
Malfunctions of the compressor and start relay
Although we assume that the freezer is working, this means that the compressor is functioning. However, it is worth considering the option when compressor it is not working at full capacity or has low performance. The piston group could wear out, creating insufficient pressure to pump freon through the full circuit. As a result, “weak” cold reaches only the first chamber (freezing).
Also often fails start relay. If it burns out, the compressor may hum but not start, or may have difficulty starting. In some two-compressor models (where each chamber has its own motor), the situation is simplified: if the upper chamber does not work, it means that the upper compressor or its relay has burned out, and the lower one continues to work properly.
Checking the compressor requires measuring the current and discharge pressure. If the motor is hot but does not start or runs intermittently, it will most likely need to be replaced. This is an expensive repair, which is often comparable to buying a new refrigerator, especially if the unit is more than 10 years old.
☑️ Initial diagnostics with your own hands
Comparative table of symptoms and probable causes
For ease of diagnosis Let's summarize the main symptoms in a single table. This will help you quickly navigate the nature of the breakdown and understand whether it’s worth calling a technician or you can handle it yourself.
| Symptom | Probable cause | Difficulty of repair | Need for a technician |
|---|---|---|---|
| The fan is not noisy, the chamber is warm | The fan is burnt out or iced up | Low | Desirable |
| Ice on the back wall, no circulation | Drainage clogged, defrost failure | Average | Yes |
| The compressor hums, but does not cool | Freon leak or blockage | High | Required |
| Temperature fluctuates, modes do not hold | Thermal sensor is faulty | Medium | Desirable |
| A click is heard, the compressor does not start | Start relay or compressor | Medium/High | Yes |
Algorithm of actions when a malfunction is detected
If you encounter the problem described, do not rush to completely disassemble the refrigerator. First, follow a series of simple steps that can help isolate the problem or even temporarily solve it if the problem is a software glitch or icing.
The first step should be complete defrosting. Unplug the refrigerator, remove all food and leave the doors open for at least 24 hours (preferably a day). This is necessary so that all the ice in the hidden channels and evaporator melts. Often, after such a procedure, the refrigerator begins to work properly if the problem was an “air lock” of ice.
After defrosting, turn on the unit and check the operation. If after 4-6 hours the situation repeats itself, then the reason is deeper. Check the tightness sealing rubber. If warm air enters the chamber, the system may not cope with cooling, although this rarely leads to a complete absence of cold in only one chamber.
⚠️ Attention: Never use sharp objects (knives, screwdrivers) to chip ice inside the chambers. Damage to the evaporator (even microscopic) will lead to an immediate leak of freon and expensive repairs, which are often not economically feasible.
If defrosting did not help, and you do not have the skills to work with a multimeter and a soldering iron, further self-diagnosis can be dangerous. It is better to call a specialist to carry out professional diagnostics, especially if we are talking about models with inverter compressors.
Frequently asked questions (FAQ)
How long does it take the refrigerator to gain temperature after defrosting?
Usually it takes 4 to 8 hours to stabilize the temperature. At this time, you should not often open the doors and load warm food. If after 12 hours the refrigerator compartment is still warm, it means that defrosting has not eliminated the problem.
Could a stuck door sensor button be the cause?
Yes, if the door sensor button is stuck pressed, the refrigerator “thinks” that the door is closed, but the defrost or lighting mode may not work correctly, which indirectly affects on the temperature regime, although more often this leads to freezing.
Why does ice freeze in the freezer, but is it warm above?
This is a classic sign of impaired air circulation in the No Frost system. Ice freezes on the evaporator because it does not have time to thaw (the defrost heating element or timer has burned out), and this ice blocks the channels, preventing cold from entering the upper chamber.
Is it worth repairing a refrigerator older than 10 years?
If a compressor replacement or complex freon refilling is required, repairs can cost up to 50-70% of the cost of a new device. In such cases, it is often more advisable to consider purchasing new equipment with a guarantee and a modern energy efficiency class.
How often should you defrost a No Frost refrigerator?
Technically, the No Frost system does not require defrosting, but manufacturers recommend doing this preventatively once a year for hygiene and checking the condition of the seals. If the system starts to malfunction (as in your case), defrosting for a day is the first diagnostic step.