The situation when the upper chamber in the refrigerator stops cooling often takes you by surprise, threatening food spoilage. This is a common problem that can be caused by both trivial operating errors and serious malfunctions of the cooling system. Before calling a technician, it is worth carrying out an initial diagnosis to understand the scale of the disaster.
In modern models, especially with the system No Frost, cold air circulation is forced. If the top part stops freezing, this often indicates a disruption in the circulation of air masses or a malfunction of the sensors. In older models with a crying evaporator, the reason may lie in a refrigerant leak or problems with the thermostat.
Do not panic and immediately write off the unit. In many cases, the problem can be solved on your own, spending a minimum of time. However, it is important to understand that ignoring the first signs of a malfunction can lead to failure of an expensive compressor.
Primary diagnosis and simple causes
Before disassembling the back wall or looking for tools, it is necessary to exclude elementary factors. Equipment owners often forget about basic operating rules. For example, if you have just placed a large amount of warm food in the chamber, the compressor may not have been able to cope with the load, and the system did not have time to reach the operating mode.
Check the tightness of the door. If the rubber seal (cuff) is dirty, damaged or simply does not close tightly, warm air constantly enters the chamber. This causes the unit to work for wear, but the upper part may not cool due to convection failure.
⚠️ Attention: If you notice that the door seal has lost elasticity or cracks have appeared on it, replacing it is a matter of time. Using this technique will lead to freezing of the evaporator and damage to the fan.
It is also worth paying attention to the temperature settings. Perhaps one of the household members accidentally moved the regulator to the “minimum” position. For the upper chamber, the range from +2 to +5 degrees Celsius is considered normal. If the "Eco" or "Vacation" mode is set, the upper zone may operate in a gentle mode, which is perceived as a malfunction.
⚠️ Attention: In some models of refrigerators with one compressor and one cooling circuit, turning off the upper chamber may be a software function. Check the instructions for your model Indesit or Stinolas there is often the possibility of turning off the upper compartment.
Problems with the defrosting system in No Frost refrigerators
The most common reason for the lack of cold in the upper chamber of refrigerators No Frost is a malfunction of the automatic defrosting system. In such units, frost freezes on a hidden evaporator, and a fan disperses the cold through the chambers. The heater turns on periodically to melt the ice. If this cycle is disrupted, the ice “coat” grows and blocks the air supply channels.
As a result, the fan either stops pushing air through the ice-clogged channels or completely blocks it. The cold just doesn't reach the top shelf. This is a classic situation when the freezer is working normally, but the refrigerator compartment is warm. The main culprits here are the defrost heating element, defrost sensor or timer (electronic control).
- ❄️ defrost heating element - burns out and stops heating, which is why the ice does not melt.
- 🌡️ Defrost sensor - incorrectly reads the temperature and does not give a command to turn on the heating.
- ⏱️ Timer or board —does not initiate the defrost cycle at the required time.
Diagnostics often require a complete defrost of the unit within 10-14 hours. If after turning on the refrigerator began to freeze, but after a week the problem returned, it means that one of the elements of the defrosting system is faulty and requires replacement.
Fan malfunctions and clogged air ducts
In the system No Frost a fan, usually located in the freezer compartment behind the rear panel, is responsible for air circulation. If it stops rotating, cold air remains below, in the freezer, and does not enter the upper chamber. The reason for the stop may be the failure of the fan motor itself or the freezing of its blades to frozen ice.
Another important element is the air dampers. In some models of refrigerators Bosch or Siemens the cold supply is regulated by a special damper with an electric drive. If the mechanism is stuck in the closed position or the damper motor is burned out, the upper chamber will remain without cooling. Diagnostics requires disassembling the internal panel.
Often users are faced with the fact that the air supply channels are clogged with products or packaging. This disrupts the aerodynamics inside the chamber. Cold air is heavier than warm air, but without free space for circulation it will not be able to cool the entire volume evenly.
Freon leakage and problems with the compressor
If the refrigerator hums, but does not freeze in any of the chambers, or freezes weakly, there is a high probability of a refrigerant (freon) leak. In dual-chamber models with one compressor, the leak often starts from the evaporator, hidden in the foamed part of the housing. First, the upper chamber stops cooling, since there is not enough gas in the system to complete the full cycle.
The compressor is the heart of the refrigerator. If it works without stopping, gets very hot, but there is no cold, this is a sure sign of a loss of tightness of the circuit or a blockage in the capillary tube. It is impossible to eliminate the leak on your own: the system must be evacuated, soldered, and charged with new refrigerant.
It is also worth paying attention to the operation of the compressor. If it turns on for a few seconds, clicks and turns off, the problem may be in the start relay or in the compressor itself (turn-to-turn short circuit). In this case, the upper chamber will also remain warm.
| Symptom | Probable cause | Necessary actions |
|---|---|---|
| It hums, but does not freeze | Freon leakage or blockage | Call a technician to find a leak |
| The freezer is freezing, the top is not | Problem with defrost or fan | Defrost for 14 hours, check the heating element |
| Compressor clicks and turns off | Malfunction of the start relay | Replacement of the start protection relay |
| A whistle or squeak is heard | Fan malfunction | Lubrication or replacement fan |
Failures in the operation of electronics and sensors
Modern refrigerators LG, Samsung and Whirlpool are stuffed with electronics. Air and temperature sensors are responsible for cold distribution and temperature control. If the temperature sensor in the upper chamber “lies” and shows that it is already cold there, the compressor simply will not turn on at the command of the control board.
The evaporator sensor often fails. It tells the board that the evaporator has warmed up, when in fact it is covered in ice. As a result, the cooling cycle does not start. Replacing sensors is an inexpensive procedure, but requires accurate diagnostics, since their resistance must correspond to the rated values at a specific temperature.
In rare cases, the problem lies in the control board itself. Power surges in the network can damage the electronic components responsible for switching the fan relay or heating element. Visually, traces of burning or swollen capacitors may be visible on the board.
The influence of external factors and operating conditions
Sometimes the reason lies not inside, but outside. If the refrigerator is placed close to a wall or in a niche with no gaps for ventilation, the compressor overheats. For protective purposes, the system can limit the operation of the unit, which affects the temperature in the chambers. The minimum gap from the back wall should be 5-7 cm.
The temperature in the room also plays a role. If the refrigerator is placed on an unheated loggia or next to a radiator, it may not work correctly. Most models are designed to operate at ambient temperatures from +10 to +32 degrees. Operation outside this range will lead to malfunctions.
⚠️ Attention: Do not install the refrigerator near heat sources (stove, radiators) or in direct sunlight. This not only reduces cooling efficiency, but also significantly increases energy consumption.
In addition, frequently opening the door or leaving it ajar disrupts the temperature balance. Moist air enters the chamber, which condenses and freezes, accelerating the fouling of the evaporator with ice, even with a working defrost system.
Algorithm of actions when a malfunction is detected
If you find that the upper chamber does not work, act sequentially. First, rule out simple reasons: check the settings, how tightly the door is closed, the presence of food in the air flow path. Then try to defrost the refrigerator completely, leaving it turned off with the doors open for a day.
After defrosting, turn on the unit and let it work for 5-6 hours without loading food. If cold appears and persists, the problem was in the defrost system (ice jam). If the cold does not appear or disappears again after a couple of days, professional diagnostics with instruments is required.
Frequently asked questions (FAQ)
Why is it warm in the upper chamber, but everything is frozen in the freezer?
This is a classic sign of a system malfunction No Frost. Most likely, the evaporator in the freezer is clogged with ice, and the fan is unable to push cold air through the clogged ducts into the upper compartment. It is also possible that the damper or the fan itself may fail.
How long does it take to defrost the refrigerator for diagnostics?
For complete and high-quality defrosting, especially if there is a suspicion of an ice plug in hidden channels, the unit must stand turned off with the doors open for at least 14-24 hours. A shorter defrosting may not produce results.
Is it possible to operate the refrigerator if the upper chamber does not freeze?
For a short period of time - yes, food can be moved down or use cooler bags. However, long-term operation with a malfunction (especially if the compressor is running without stopping) will lead to its overheating and expensive repairs.
Why, after defrosting, did the refrigerator stop freezing again after a week?
This confirms that the automatic defrosting system is not working. Ice accumulated again and blocked the channels. It is necessary to check the defrost heating element, defrost sensor and timer (or control module).