The situation when food in the main chamber of the refrigerator begins to deteriorate, and the shelves become warm, is familiar to many owners household appliances. Most often, users notice the problem in the upper compartment, since the temperature there should be the most stable for storing ready-made dishes. If you find that the upper chamber does not freezethis may indicate a number of malfunctions, from a banal overload to a serious failure of the compressor.
The first thing to do when a problem is detected is not to panic and carry out an initial diagnosis. Often the cause is a human factor or a minor technical problem that you can fix yourself. However, ignoring the signal about a violation of the temperature regime can lead to complete defrosting of the entire contents and expensive repair of the unit.
In this article we will examine in detail the main reasons why The refrigerator has stopped keeping cold it is in the upper compartment. We will look at the design features of different cooling systems, methods for checking components and an action algorithm that will help you understand whether you need to call a technician or the situation can be corrected on your own.
Design features and cold distribution
To understand the nature of the malfunction, it is important to know how your unit is designed. In classic two-chamber models with one compressor, cold air is generated in the freezer compartment and then distributed throughout the entire volume. If the upper chamber does not cool, this often means that the circulation of air flow is disrupted or stopped.
In models with the system No Frost a special fan is responsible for air movement. It forces cold from the evaporator into the chambers through air ducts. If this mechanism fails or freezes, the cold simply does not reach the upper shelves, remaining below or in the freezer. In drip systems (“crying evaporator”), cooling occurs due to natural convection, and the tightness of the circuit is critical here.
⚠️ Attention: In refrigerators with one compressor, a malfunction of the freezer compartment (lower) almost always entails a loss of cold in the upper compartment, since they are connected into a single system.
There is also a division by type of control. In mechanical models, adjustment occurs due to a thermostat, which physically opens the circuit. In electronic refrigerators the control module, which receives data from sensors, is responsible for all processes. An error in reading the readings can lead to the fact that the unit “thinks” that there is already cold and does not turn on the cooling.
The most common causes of loss of cold
Service center statistics show that most cases when the upper chamber does not work, is associated with a limited set of breakdowns. Understanding these reasons will help you navigate the situation faster.
One of the main problems is a refrigerant (freon) leak. If a microcrack has formed in the system, the gas gradually evaporates. First, the refrigerator starts working longer, trying to gain temperature, and then it stops cooling altogether. In such cases the compressor can work almost without stopping, trying to compensate for the lack of refrigerant, but this has no effect.
The second common reason is a malfunction of the thermostat or temperature sensor. If this element is “stuck” in the “off” position, the compressor simply does not receive a command to start. As a result, it becomes warm inside, although the equipment appears to be working properly. In electronic models, the defrost sensor often fails, which is why the evaporator becomes overgrown with a “fur coat” and blocks the air supply channels.
The third reason lies in the defrost system. If the defrost heating element or timer does not work, ice freezes on the evaporator in a thick layer. The fan starts to hum or stops, and cold air stops flowing into the chamber. The user can see that the freezer is still freezing, but the temperature in the upper compartment is already above zero.
- ❄️ Freon leak: requires searching for the place of damage and refilling the system.
- 🔧 Thermostat malfunction: replacement of the sensor or mechanical regulator is necessary.
- 🧊 Evaporator freezing: often caused by a breakdown of the defrost heating element or timer.
- 🔌 Problems with a start relay: the compressor hums, but does not start, or often clicks.
Diagnostics of the No Frost system and air circulation
If you have a modern model with the system No Frost, and the upper chamber has stopped cooling, in 80% of cases the problem lies in impaired air circulation. The cold is generated in a hidden unit and must be forced by a fan through special channels.
The first thing you need to pay attention to is the operation of the fan. Open the doors of both cells and listen. If the fan should stop when you open any door (this is a standard safety feature), check to see if it works when the doors are closed. If the blades are standing, it means that the air is not circulating and the upper part of the refrigerator does not receive cooling.
A situation often occurs when the air supply channels become clogged with ice. This occurs due to a malfunction of the defrost system. An ice plug can completely block the access of cold to the upper compartment. This can be seen visually if you remove the back plastic panel in the freezer (defrosting is required).
It is also worth checking the air duct damper. On some models it is electronically controlled and may become stuck in the closed position. If the damper does not open, the cold physically cannot enter the upper compartment.
☑️ Diagnostics No Frost
Problems with the compressor and refrigerant
The heart of any refrigerator is the compressor. If it does not work correctly, the entire unit suffers. However, it happens that the compressor hums, but there is no cold. This may indicate a loss of performance or problems with gas circulation.
When freon leaks, the pressure in the system drops. The compressor tries to pump gas, but its volume is insufficient for effective heat exchange. As a result, the evaporator (inside the chamber) remains warm or frosted only at the tube inlet, and the rest of the part does not work. This is a classic sign that the refrigerator is not freezing due to a lack of refrigerant. Another possible problem is a clogged capillary tube. A plug may form in the circulation system from oil or moisture oxidation products. This blocks the freon flow. The symptoms are similar to a leak: the compressor works, but there is no cold, and the condenser can only be hot at the beginning. the refrigerator doesn't freeze due to lack of refrigerant.
Another possible problem is a clogged capillary tube. A plug may form in the circulation system from oil or moisture oxidation products. This blocks the freon flow. The symptoms are similar to a leak: the compressor works, but there is no cold, and the condenser may only be hot at the beginning.
⚠️ Attention: Self-filling the refrigerator with freon is impossible without special equipment and skills. An attempt to add gas “by eye” will lead to the final failure of the compressor.
It is also important to check the start-up relay. If it is faulty, the compressor may try to start, make a clicking noise, and then shut down. In this case, it does not have time to create the necessary pressure, and cooling does not occur.
The influence of the defrosting mode and user errors
The reason does not always lie in the breakdown of parts. Often users themselves create the conditions under which the upper chamber does not cool properly. For example, installing a refrigerator close to the wall interferes with the ventilation of the condenser, which leads to overheating and reduced efficiency.
Loading warm food or storing it in an open container leads to excessive steam formation. Moisture settles on the evaporator, quickly turning into ice. The defrosting system may not be able to cope with such a volume of ice, which leads to freezing of the channels and stopping the supply of cold.
Incorrect setting of the temperature mode is another common mistake. If you accidentally set the regulator to minimum or activated the "Vacation" mode (if it does not provide cooling of the upper chamber), the equipment will work exactly as you ordered it.
| Symptom | Possible cause | Action |
|---|---|---|
| Humming, but not cold | Freon leak or blockage | Call a technician for diagnostics |
| Silent, warm inside | The thermostat or relay is faulty | Check the electrical circuit |
| The freezer is freezing, there is no top | The fan or damper does not work | Check the No Frost system |
| Ice on the back wall | The defrosting system is faulty | Defreeze for 24 hours |
Self-check algorithm before calling a technician
Before calling the service, you should perform a number of simple actions. This will help weed out simple causes and save time. If the refrigerator has stopped freezing, proceed sequentially.
First check the tightness of the door. The rubber seal must be clean and elastic. If it becomes dirty or deformed, warm air enters the chamber and the unit does not have time to cool it. Wipe the seal and check for gaps.
Then evaluate the loading of the chambers. If food is placed close to the back wall or blocks the air outlets, circulation is impaired. Clear space at the back wall and distribute food evenly.
Check the settings. Make sure that the temperature mode is set correctly (usually +3...+5°C for the main chamber). If you have an electronic control, try rebooting the module by unplugging the refrigerator from the outlet for 15-20 minutes.
⚠️ Attention: Specifications and location of controls may vary depending on the model. Always check the official instructions from the manufacturer of your specific brand refrigerator.
If the problem persists after completely defrosting (at least 24 hours) and checking the settings, a professional repair will most likely be required. You should not try to disassemble the compressor or solder the tubes yourself without experience.
Why, after defrosting, did the refrigerator stop cooling again after a couple of days?
This is a sure sign of a malfunction of the automatic defrosting system. Most likely, the defrost heating element has burned out, or the defrost sensor or timer has failed. Ice again accumulates on the evaporator and blocks the channels.
Is it possible to operate the refrigerator if the upper chamber does not cool?
For a short time - yes, but the food in the upper compartment will spoil. Long-term operation in this mode is dangerous for the compressor, which will wear out trying to reach the set temperature. It is better to turn off the unit before repair.
How long do you need to wait for the cold after turning it on?
Usually it takes from 2 to 6 hours to reach operating temperature, depending on the volume of the chamber and the number of loaded products. If after 8-10 hours the upper chamber does not cool, this is a sign of a malfunction.
Does hot weather affect the operation of the refrigerator?
Yes, at high temperatures in the room, heat exchange is difficult. The capacitor does not have time to cool down, efficiency drops. During such periods, the refrigerator may work longer, and the temperature inside may rise slightly.