The situation when The refrigerator is very cold it is in the upper chamber often catches owners by surprise and can lead to spoilage of food that is not intended for extremely low temperatures. Instead of simply cooling, the unit turns vegetables into ice blocks and dairy products into stone, while the lower part can work normally or, conversely, warm up. This is a clear signal that the balance of the temperature regime inside the device is disturbed.
Such behavior of the equipment does not always mean an expensive overhaul, but the problem cannot be ignored. Compressorworking in an enhanced mode to maintain an abnormally low temperature in one compartment quickly wears out. Understanding exactly how the refrigerant and air circulation works in your model will help you quickly identify the root of the problem.
In modern systems No Frost and classic drip refrigerators, the reasons can be radically different. In some cases, a simple human error in the settings is to blame, in others it is a physical breakdown of the sensors or a mechanical blockage of air flow. Next, we will analyze the main scenarios why The refrigerator freezes the upper chamber more than the lower oneand determine the algorithm of action.
Checking the settings and operating mode
Before grabbing the tools, it is necessary to eliminate basic operating errors. Often, users accidentally change the operating mode to “Super Freeze” or set the minimum temperature, forgetting about it. In models with electronic control, the failure could be caused by a power surge, and now controller is sending incorrect commands.
If you have a two-chamber refrigerator, pay attention to the distribution of cold. In some older models or devices with one compressor and one cooling circuit, the cold initially comes from top to bottom. If the thermostat is set to maximum, the top shelf will inevitably be the coldest zone.
Check if the quick freezing mode is activated. Usually it is indicated by a button with a picture of a snowflake or an inscription Fast Freeze. In this mode compressor works continuously, without turning off at the thermostat signal, which leads to deep freezing of the entire volume, starting from the upper tiers.
⚠️ Attention: If you reset the settings to factory settings and the problem remains, it means that the problem is not a software failure, but in the physical malfunction of the unit components.
Malfunctions of the thermostat and sensors
One of the most common reasons why the refrigerator is very coldis the failure of the thermostat. This unit is responsible for turning off the compressor when the set temperature is reached. If the contacts are stuck in the “on” position or the capillary tube has lost sensitivity, the unit will work without stopping.
In refrigerators with the system No Frost air sensors are responsible for the temperature. If the sensor located in the upper part of the evaporator transmits incorrect data (lowers the actual temperature), electronic module will not give a command to stop the compressor or close the cold supply damper.
- 🔧 Mechanical thermostat: Often requires replacement entirely, since adjusting the calibration screw inside is a complex process and does not always work long-term effect.
- ❄️ Defrost sensor: If it is faulty, the evaporator may become covered with ice, but the fan will continue to drive cold air into the chamber until the emergency mode is triggered.
- 📉 Sensor resistance: Checking with a multimeter at a certain temperature will show whether the resistance corresponds to the passport values for your model.
A symptom of a sensor malfunction is often not only hypothermia, but also the absence of defrost cycles. Ice builds up on the evaporator, blocks the channels, and cold air blows directly onto the food in the upper chamber, bypassing the normal circulation cycle.
Problems with the defrost system and ice freezing
If the refrigerator is very cold the upper part, but frost is visible inside the chamber on the back wall or around the fan, the problem may lie in the system defrost. Ice accumulating on the evaporator narrows the flow area of the air ducts. As a result, the flow of cold air becomes directed and concentrated, hitting one point - usually the top shelf.
Three main elements are responsible for the defrosting process: Defrost heating element, defrost timer (or an electronic module) and a defrost sensor. If the heating element burns out, the ice does not melt, building up layer by layer. The fan begins to hum more strongly, trying to force air through the ice plug, and blows this stream directly into the chamber.
Diagnostics requires defrosting the refrigerator for a day. If, after complete defrosting and turning on, the unit began to work normally, but after 1-2 days the situation repeated itself, the defrosting circuit is definitely faulty. It is necessary to ring the heating element for a break.
⚠️ Attention: Do not try to pick out the ice with a knife or sharp objects. Damage to the evaporator tubes will lead to freon leakage and expensive repairs, which cannot be performed on your own without special equipment.
Clogged capillary tube and freon leak
Paradoxically, a refrigerant leak or partial blockage of the capillary system can also cause local hypothermia. If the system No Frost has formed an ice or oil blockage in the capillary tube, the circulation of freon is disrupted. In this case, the evaporator may cool unevenly: one part of it (usually the beginning) will be covered with frost or ice, and the rest will remain warm.
The fan, driving air through this locally cold section of the evaporator, will supply an abnormally low temperature flow into the chamber. In this case, the compressor can work almost non-stop, trying to “catch up” the temperature throughout the entire volume, but due to blockage, efficiency decreases.
Signs of problems with the refrigerant:
- 🔊 Noisy work: The compressor hums continuously, sometimes with gurgling sounds.
- 🌡️ Hot condenser: The grille at the back can only be partially hot or, conversely, remain cold.
- 💧 Water: The appearance of puddles under the refrigerator due to the fact that the defrost system cannot cope with the melting of ice on the frozen evaporator.
For accurate diagnostics, you need to call a specialist with a pressure gauge manifold. It is impossible to independently determine the pressure level and the presence of non-condensable impurities in the circuit.
Failure of the air regulator damper
In two-chamber refrigerators with one compressor and one cooling circuit (for example, many models Indesit, Atlant, Stinol), the temperature in the refrigeration chamber is regulated by a special damper. It opens and closes, letting cold air from the freezer (which may be on top) into the refrigeration compartment.
If the damper mechanism is stuck in the open position or fails damper motor, cold air flows freely into the upper part of the refrigerator compartment. The thermostat in the refrigerator compartment may already give the “stop” command, but the physical damper will remain open.
| Symptom | Probable cause | Action |
|---|---|---|
| Ice only at the back wall | The defrost sensor is faulty | Replace the sensor |
| It's cold only on the top | The damper is open or broken | Repairing the damper mechanism |
| The compressor does not turn off | Thermostat is faulty | Replacing the thermostat |
| Frost in wisps all over evaporator | Freon leakage | Searching for leaks and refilling |
In some models, the damper is controlled mechanically, in others - electronically. If you hear clicking or cracking noises from the top of the refrigerator during operation, this may indicate that the motor is trying to close the damper, which it is unable to do.
How to check the damper without disassembling?
Carefully remove the decorative panel at the top of the refrigerator compartment (where the cold air comes out). Have an assistant change the temperature setting. If the damper does not move when the settings are changed, the mechanism is faulty.
The influence of seals and chamber tightness
It would seem that a loose door fit should lead to heating, but in reality everything is more complicated. If sealing rubber the door is damaged or skewed, warm, moist air constantly enters the chamber. The cooling system, trying to compensate for the heat, wears out.
Moisture from the incoming air instantly condenses and freezes on the coldest elements - usually the upper part of the evaporator or the rear wall. The resulting ice ball begins to work as a cold accumulator, releasing temperature onto the food even more than required.
Check the condition of the seal around the entire perimeter. A test with a sheet of paper will help identify weak points: hold the sheet with a door and try to pull it out. If it is pulled out without resistance, the seal is broken. Also check if anything is preventing a tight closure: swollen packaging, a plate on the shelf, or misalignment of the door itself due to wear on the hinges.
☑️ Diagnosis of the seal
Independent algorithm diagnostics
In order not to guess, but to act methodically, follow the step-by-step instructions. This will help save time and, possibly, money on calling a technician if the problem turns out to be trivial.
1. Unplug the refrigerator and defrost it completely within 24 hours. This is a critical step to clear electronic errors and eliminate ice jams.
2. After switching on, listen to the operation of the compressor. If it turns on and does not turn off for more than an hour, and it is already cold inside, the problem is in the thermostat or sensor.
3. Check your settings. Make sure that the “Super Freeze” mode is not set and the temperature is set to +4...+5°C.
4. Inspect the evaporator (through the back wall or by removing the panel in the freezer). Is it evenly covered with frost? Are there ice build-ups?
⚠️ Attention: If after defrosting the refrigerator worked normally for a day, and then the problem returned, this is a guaranteed sign of a malfunction of the defrost or temperature control system. You can only operate the equipment in this mode for a short time.
Frequently asked questions (FAQ)
Is it possible to use the refrigerator if it is severely freezes?
Short-term - yes, but food on the top shelves will spoil or freeze. Long-term operation will lead to compressor failure due to work without rest. It is better to eliminate the cause.
Why does a “coat” of ice form in the upper chamber?
This is a sign of a malfunction of the defrost system. The heating element, timer or sensor has burned out. Ice blocks the channels, and cold air blows directly onto the food, causing it to freeze.
How much does it cost to replace a thermostat?
The cost consists of the price of the part and the work of the technician. The thermostat itself is inexpensive, but replacing it requires disassembly and fine-tuning, so without experience it is better to contact a professional.
Does the amount of food affect the uniformity of cooling?
Yes, filling the chamber affects heat transfer. An empty refrigerator changes temperature faster. However, strong local freezing is always a sign of a technical malfunction, and not just improper loading.
What to do if the problem disappears after defrosting?
This means that the cause was an ice jam. Keep an eye on the unit. If after a week the situation repeats, it means that the defrosting system is not working correctly and requires replacing one of the elements (heating element, sensor or timer).