The situation when food freezes “to stone”, and room temperature reigns on the top shelf of the main compartment or, conversely, everything melts, is one of the most common complaints from owners of household appliances. Such asymmetry of temperature conditions often takes you by surprise, since externally the unit can operate quietly and without visible signs of malfunction. However, a failure has already occurred within the refrigerant circulation or control system, which requires immediate intervention. freezer food freezes “to stone”, and on the top shelf of the main compartment there is room temperature or, conversely, everything melts, this is one of the most common complaints of owners of household appliances. Such asymmetry of temperature conditions often takes you by surprise, since externally the unit can operate quietly and without visible signs of malfunction. However, there has already been a problem within the refrigerant circulation or control system that requires immediate attention.
Before calling a technician or starting self-diagnosis, it is important to understand the operating principle of your device. In modern models with a system No Frost cold is produced in one place and distributed throughout the entire volume, while in older drip systems the evaporator is hidden behind the back wall. If compressor it hums continuously or, on the contrary, is silent, and there is no cold in the upper compartment, this is the first signal that the cooling cycle is broken. Ignoring the problem can lead to complete damage to the products and expensive repairs.
In this article we will analyze in detail the mechanical and electrical causes of such a breakdown. We will look at how refrigerant leaka clogged capillary tube or failure of the defrost system affects the distribution of cold. Understanding these processes will help you more accurately describe the problem to a specialist or, in some cases, fix the problem yourself, saving the family budget.
⚠️ Attention: If you hear gurgling or hissing inside the refrigerator, this may indicate an active freon leak. In this case, operation of the equipment must be stopped before the technician arrives, since the compressor may burn out from overheating, trying to compensate for the lack of pressure.
Refrigerant leakage: the most common cause of imbalance
The most likely reason that freezer continues to freeze, and in the refrigerator heat separation, there is a partial leak freon. The refrigerant circulates in a closed circuit, and the first to cool is the freezer evaporator, which is located at the beginning of the cycle. When the amount of gas in the system drops, there is simply not enough of it to go through a full circle and cool the main compartment.
A leak can occur anywhere in the circuit: in the foamed parts of the body, in places where pipes are soldered, or through microcracks in the evaporator. Often, owners themselves provoke depressurization by trying to pry off frozen food with a knife or defrost the unit with sharp objects. Damage to the inner wall leads to the release of gas, and the system loses its efficiency.
Symptoms of a freon leak are quite characteristic and appear gradually. At first, you may notice that compressor it has begun to work longer than usual, almost non-stop, trying to reach the set temperature. Then a “snow coat” may appear on the back wall of the freezer in only one corner, and the upper chamber will stop cooling altogether.
- 🔍 The compressor works continuously or with very short pauses, trying to compensate for the lack of cold.
- 🔍 In the freezer In the chamber, an ice crust forms unevenly, often only at the entrance of the tubes or in one of the corners.
- 🔍 The upper chamber completely loses its cold, the temperature of the products approaches room temperature.
- 🔍 To the touch, the side walls of the refrigerator (where the condenser is usually hidden) remain cold or barely warm, although they should warm up.
Diagnostics of leaks at home is difficult, since the gas is colorless and odorless. However, if you suspect this particular problem, you should listen to the operation of the unit. If the motor is humming, but there is no cold anywhere or only in the freezer, this is an almost guaranteed loss of system integrity.
Malfunctions of the defrosting system in No Frost refrigerators
In units equipped with the system No Frostthe problem with the lack of cold in the upper compartment when the freezer is running is often hidden in violation of the cycle defrosting. In such models, the evaporator is hidden behind a plastic panel, and the frost that freezes on it is periodically thawed by special heaters. If this process is disrupted, the evaporator becomes overgrown with ice, which blocks air circulation.
The fan, which is supposed to drive cold air from the freezer into the upper chamber, simply cannot blow air through the ice plug. As a result, in the freezer compartment, where the evaporator itself is located, the cold remains (and even becomes extremely low), and air masses do not enter the refrigeration compartment. This is a classic picture for a malfunction Defrost heating element, thermostat or timer.
To confirm this hypothesis, it is not necessary to immediately disassemble the unit. Try defrosting the refrigerator completely. Leave the doors open for at least 24 hours (preferably a day), after unplugging the appliance. If, after switching on in normal mode, cold appears in both compartments, but after a few days the situation repeats, the problem is definitely in the defrosting system.
⚠️ Attention: Never use a hairdryer or hot water to quickly defrost the ice inside the housing if you suspect a problem with the evaporator. A sharp temperature change can deform plastic air ducts or damage the heating element, making repairs much more expensive.
The main elements that fail in the system No Frost:
- ❄️ Heating element defrost: the heater spiral burns out, the ice on the evaporator does not melt during a compressor pause.
- ❄️ Defrost sensor: incorrectly reads the evaporator temperature and does not give a command to turn on the heating.
- ❄️ Timer defrosting (or control module): “sticks” in cooling mode and does not switch the refrigerator to defrost mode.
Is it possible to drive a car with a faulty catalyst?
Technically, driving is possible, but this will lead to increased fuel consumption, loss of engine power and eventual damage to the engine due to increased back pressure. In addition, the exhaust will become toxic, and environmental control will not pass.
Problems with the fan and clogged air ducts
If your refrigerator has a forced air circulation system, then fanis responsible for delivering cold from the freezer to the upper compartment. Stopping it causes the cold, heavy air to remain below, in the freezer compartment, while the upper part remains warm. This is a mechanical problem that is easier to solve than a freon leak.
The fan can stop working for several reasons. The first is freezing of the blades. If the defrost system is not working properly, ice can get into the impeller and block its rotation. The second reason is a failure of the fan motor itself or a break in the wiring going to it. The third is clogging of the air supply channel with food crumbs or packaging.
You can check the operation of the fan visually or by ear. Open the refrigerator door (on some models, the fan stops when the door is open, so you may need to press the door sensor with your finger or a magnet). If you do not hear the characteristic air noise or hum of the motor, then there is no circulation.
It is also worth checking the air supply channels. In modern models they can be located on the back wall or between the cameras. If small objects or products get there, the air flow is blocked. Regular inspection of the contents and proper packaging of products will help avoid such situations.
Clogged capillary tube and compressor operation
Another technical reason why freezer it gets cold, but the top is not, is partial blockage capillary tube. This is a very thin pipeline in which a sharp drop in refrigerant pressure occurs. If oil oxidation products or moisture appear in the freon circulation system, they can clog the lumen of the tube.
If clogged, the refrigerant cannot circulate freely throughout the entire circuit. It accumulates at the beginning of the cycle (in the freezer), creating excess cooling there, but does not reach the evaporator of the refrigerator compartment. In this case, the compressor may work with overload, trying to push gas through the obstacle, which is often accompanied by a change in the sound of its operation.
It is extremely difficult to diagnose a blockage on your own, since special equipment is required to measure the pressure in the system and evacuation. A symptom may be that the condenser (grid at the back) heats up unevenly: hot only at the beginning and cold at the end, although it should be warm over the entire area.
To eliminate this problem, the technician will have to:
- Pump out the remaining freon from the system.
- Purge the circuit with nitrogen under high pressure to remove the plug.
- Replace the filter drier, which takes on the main cleaning load.
- Evacuate the system and charge it with new refrigerant.
Comparison of symptoms: how to distinguish one breakdown from another
In order not to guess at the tea leaves and roughly understand the scale of the disaster, it is useful to systematize the signs of malfunctions. Different breakdowns have their own unique “signatures”, which make it possible with a high degree of probability to determine the cause before the technician arrives.
Below is a table that helps differentiate the main problems associated with the lack of cold in the upper chamber when the freezer is running.
| Symptom | Leakage freon | No Frost malfunction | Clogged capillary | Fan |
|---|---|---|---|---|
| Compressor operation | Works without stopping | Works in normal mode | Buzzes, may be overheating | Works, but there is no air noise |
| Ice in the freezer | In one corner or at the entrance | Solid coat on the back wall | Uneven, often at the entrance | Ice may be on the blades |
| Temperature at the back | Cold or barely warm | Normal | Hot at the beginning, cold at the end | Normal |
| Defrost effect | Does not help | Temporarily helps (for 1-3 days) | Does not help | It may help if there is ice on the fan |
By analyzing these signs, you can save time on diagnosis. For example, if after defrosting the refrigerator worked like new, but after a couple of days the story repeated itself - look for a problem in Heating element or sensors. If defrosting did not give any effect, and the compressor threshes for days, most likely the gas has escaped.
Prevention and operating rules
To avoid situations when upper chamber stops cooling, it is important to follow the rules for operating household appliances. Many problems, especially those related to the system No Frost and ventilation, arise due to improper use.
First of all, monitor the temperature of the food you put in the refrigerator. Placing hot pots or warm dishes sharply increases the humidity inside the chamber, which leads to accelerated fouling of the evaporator with ice. This creates an extra load on the defrosting system and can lead to its failure.
Secondly, do not fill the refrigerator to capacity with food. For proper air circulation, free space is necessary, especially near the back wall and ventilation holes. If you close the air supply channels with bags, the cold simply will not reach the upper shelves.
☑️ Check before calling a technician
Regular, at least once a year, preventative defrosting (even for the No Frost system) helps remove micro-ice plugs in hard-to-reach places and extend the life of the unit. Also check the integrity of the seals: if the door does not fit tightly, a constant flow of moist air is guaranteed to lead to icing and malfunction.
Why did the refrigerator work after defrosting, but after a couple of days it stopped cooling again?
This is a classic sign of a malfunction of the defrost system in models No Frost. While you defrosted the unit for a day, the ice on the evaporator melted and the fan was able to circulate air again. But once the ice grew back (usually takes 2-4 days depending on humidity), it blocked the air channel. It is necessary to change the heating element, sensor or timer.
Is it possible to operate the refrigerator if the upper chamber is not cold?
For a short time - yes, if the freezer is working. However, this is an abnormal operating mode of the compressor. It will work hard trying to reach temperature, which will lead to overheating and eventual combustion. In addition, bacteria will begin to multiply in a warm chamber. It’s better to move the food and do the repairs.
How much does the repair cost if the cold in the refrigerator compartment is gone?
The cost depends on the reason. Replacing a heating element or fan will cost less, since it is a replacement of a spare part. Freon leakage and finding the location of the damage, as well as eliminating a clogged capillary tube are more labor-intensive processes that require gas refilling, so they are more expensive. The technician will tell you the exact amount after diagnostics.
Does the position of the refrigerator affect the operation of the upper chamber?
Yes, it does. If the refrigerator is not level and is skewed, the oil from the compressor may not return to the crankcase, but may go into the circuit, creating an oil plug. Also, a skewed door may not close tightly, breaking the tightness. Always check the level of the device during installation.
What to do if the compressor is cold and the refrigerator is not freezing?
If the compressor is working (humming), but remains cold, and there is no cold anywhere or only in the freezer - this is almost a 100% sign of a freon leak or a complete blockage of the system. In this case, attempts to “knock” or “warm up” the compressor will not help; professional repairs with soldering and refilling are required.