The situation when The refrigerator freezes, but the top does not coolis one of the most common complaints from owners of household appliances. In the freezer, food turns to stone, ice crusts grow, and milk on the top shelf turns sour faster than usual. This is a classic symptom of a refrigerant circulation problem or problems with the defrost system, which requires immediate intervention.
In most cases, it is too early to panic, as the cause may be hidden in a banal overload of products or an electronics failure. However, ignoring the problem can lead to failure of compressor the most expensive component of the unit. In this article we will analyze in detail the physics of the process, possible breakdowns and methods for eliminating them without calling a specialist.
Modern models, be it Indesit, Atlant or LG, are often built using the No Frost system, where cold is forced in. If you have a classic two-chamber refrigerator with one circuit, then the malfunction may be due to a freon leak or a clogged capillary tube. Understanding the principle of operation will help you quickly diagnose a malfunction.
The principle of operation of a two-chamber refrigerator
To understand why the refrigerator has stopped freezing in the upper compartment, you need to remember the basic diagram. In classic models, the evaporator is located in the freezer, and cold air is transferred to the refrigerator compartment through special channels. If this flow is blocked by ice or the fan stops, the upper chamber remains warm.
In systems No Frost a fan is responsible for circulation, which drives cooled air through the air ducts. If it stops due to ice or engine failure, the cold simply does not reach the upper shelves. In models with a drip defrost system, the correct balance between the evaporator temperature and the operation of the thermostat is important.
A violation of the tightness of the circuit or loss of refrigerant properties leads to the fact that freon has time to boil and release cold only at the beginning of the cycle, that is, in the freezer. The gas reaches the upper chamber already warm. That is why The freezer is working, but the refrigerator is not. is a key marker for diagnosis.
⚠️ Attention: If you hear gurgling or hissing inside the cabinet after the compressor stops, this may indicate movement of the oil and freon mixture, which often indicates a leak or blockage.
Electronic control also plays an important role. The control module reads the temperature sensors in both chambers. If the upper chamber sensor “lies” and shows the norm, the compressor may not turn on for a long enough time for complete cooling.
Everyday reasons: settings and overload
Before grabbing the tools, eliminate the human factor. Often, users themselves accidentally change the settings or overload the unit. Check to see if you have set the temperature control to minimum. In the summer heat, there may not be enough power if the thermostat is set to low cooling.
Overloading with food is another common reason. If you put a just-cooked hot pot in the chamber or fill the shelves to capacity, air circulation is disrupted. Cold simply cannot penetrate deep into the food mass, creating the illusion of breakdown.
- 🌡️ Check the position of the temperature regulator - it may be set to the "Minimum" position.
- 🚪 Make sure the door fits tightly and the seal is not damaged.
- 📦 Do not place food close to the back wall, blocking the outlet openings of the air ducts.
- 🍲 Avoid storing hot foods that sharply increase the overall temperature inside.
It is also worth paying attention to the location of the refrigerator. If it stands close to the wall or next to the radiator, heat exchange is disrupted. The compressor works hard, trying to compensate for heat inflows, but efficiency drops, and it becomes warm in the upper chamber.
Malfunctions of the defrost system (for No Frost)
If your The refrigerator does not freeze in the upper compartmentbut buzzes and seems to be working, in 80% of cases the defrost system is to blame. A “fur coat” is growing on the evaporator, hidden behind a plastic panel in the freezer. It blocks the fan and blocks the air supply channels.
The defrosting process is controlled by a timer, heater and defrost sensor. If any of these elements fail, the ice does not melt, but accumulates with each cycle. Sooner or later, the ice plug completely isolates the fridge compartment from the cold source.
Diagnostics often require partial disassembly of the freezer. It is necessary to remove the back panel and visually assess the condition of the evaporator. If it is completely covered with ice, and the fan stops or spins with difficulty, this is where the problem lies. Mechanical cleaning of ice will give a temporary effect if you do not replace the burnt heating element or sensor.
☑️ Diagnostics of the No Frost system
⚠️ Attention: When chipping ice, do not use a knife or sharp objects under any circumstances. Damage to the evaporator tubes will lead to an immediate release of freon and expensive repairs.
Often owners confuse this breakdown with a freon leak. However, when there is a leak, the refrigerator is usually silent or works without stopping, but does not cool anywhere. Here the freezer freezes perfectly, which confirms the presence of refrigerant, but there is nowhere for the cold to escape.
Problems with the compressor and refrigerant
A more serious situation when the refrigerator slightly freezes the upper chamber due to problems with the circuit. This could be a freon leak or a clogged capillary tube. In both cases, the pressure in the system is disrupted, and the refrigerant cannot effectively transfer heat along the entire length of the circuit.
When freon leaks, the compressor often works without interruption, trying to gain temperature, but to no avail. At the same time, it is warm in the upper chamber, but in the freezer, food can thaw or freeze only at the back wall. A characteristic sign is a hot condenser (grid at the back) only at the beginning or, conversely, a cold one.
Clogged capillary tube manifests itself with similar symptoms. The compressor is humming, the condenser may be hot, but gas circulation is difficult. Often a gurgling sound is heard. Repair in both cases requires calling a technician with specialized equipment for vacuuming and filling.
| Symptom | Probable cause | Difficulty of repair |
|---|---|---|
| The compressor does not turn off | Freon leak | High (needs a master) |
| Ice only on part of the evaporator | Clogged capillary tube | High (needs a master) |
| The freezer is freezing, the top is warm | Defrost malfunction | Medium (you can do it yourself) |
| The refrigerator is silent and does not cool | The compressor has burned out or starting | High (replacement of unit) |
It is impossible to fix a leak or blockage yourself without skills and tools. Attempts to “add freon” without searching for a leak will only lead to a temporary effect and damage to the compressor due to moisture entering the system.
Why can’t you just add freon?
Adding refrigerant without evacuation of the system is prohibited. Air and moisture will remain in the circuit, which will cause corrosion from the inside and blockage of the capillary with ice in a short time. A complete refill is required.
Failures in electronics and sensors
In modern electronically controlled models, the module is responsible for all processes. If the upper chamber of the refrigerator does not cooland the freezer is working, the problem may be in the upper compartment temperature sensor. It sends the wrong signal that the cold has been reached, and the compressor turns off.
The air damper also often fails. This is a mechanism that regulates the flow of cold air from the freezer to the refrigerator compartment. If the damper is stuck in the closed position or its drive motor is burned out, the cold simply does not flow.
Diagnostics of electronics requires a multimeter. It is necessary to test the sensors for resistance at different temperatures. A deviation from the nominal value of even 10-20% can cause malfunctions in the control algorithms.
- 🔌 Check the integrity of the wires going to the sensors and the damper.
- 🎛️ Carry out self-diagnosis (if provided by the model) to identify error codes.
- 🌡️ Measure the resistance of the temperature sensor and compare it with the table of ratings.
Sometimes the problem lies in a banal voltage surge that “suspenses” the control module. In such cases, a complete reboot helps: disconnecting from the network for 15-20 minutes. If after switching on the operating logic is restored, you are in luck.
⚠️ Attention: Technical characteristics and location of sensors may vary depending on the specific model and year of manufacture. Always check the manufacturer's official service documentation before replacing components.
Algorithm of actions when a problem is detected
If you find that The refrigerator does not freeze well at the top, act consistently. Rule out simple causes first: check the settings, how tightly the door is closed, and the lack of hot food. If this does not help, move on to more complex steps.
Try to defrost the refrigerator completely. Unplug it, remove all food and leave the doors open for at least 24 hours. This is necessary so that the ice in the hidden channels and on the evaporator completely melts. Often after this procedure, the equipment begins to work properly.
If, after complete defrosting and turning on, the problem returned after 1-2 weeks (the ice froze again and the cold at the top disappeared), then the defrosting system is faulty. The heating element, sensor or timer needs to be replaced. If there is no cold at all and the compressor is silent or works without stopping, call the technician.
Timely reaction allows you to save money. Repairing the defrost system is cheaper than replacing a compressor that burned out due to overheating or eliminating the effects of corrosion after a long leak.
Frequently asked questions (FAQ)
Why did the refrigerator work after defrosting, but after a week stopped freezing at the top again?
This is a classic sign of a malfunction of the defrost system (heating element, sensor or timer). Ice builds up again on the evaporator and blocks the air supply channels. The defective part needs to be replaced.
Is it possible to operate the refrigerator if the upper chamber does not freeze?
For a short time - yes, if the freezer is working. However, the compressor may be working overload as it tries to compensate for the heat. Long-term operation in this mode reduces the service life of the equipment.
How long does it take to defrost the refrigerator to remove the ice jam?
It is recommended to keep the refrigerator unplugged from the mains with the doors open for at least 24 hours. This is the only way the ice in the depths of the air ducts will have time to completely melt and evaporate.
Does the compressor hum when freon leaks?
Yes, most often the compressor works continuously, trying to gain temperature, but does not turn off. In this case, the condenser at the back may be barely warm or cold, and there may be no cold in the chambers.