Situation, when the refrigerator freezes only on one sidecauses bewilderment and anxiety for any owner of household appliances. The expected uniformity of cold distribution is disrupted, and food in one part of the chamber may freeze, while in another it may spoil. This phenomenon is especially typical for models with a No Frost system and dual-circuit cooling systems, where complex electronics and mechanical components are responsible for the temperature regime.
In modern units, be it Liebherr, Bosch or Indesit, uneven cooling rarely an accidental defect. Most often this is a symptom of a specific malfunction compressor, thermostat or the heat removal system. Understanding the physics of the process helps to quickly identify the root of the problem, without resorting to an expensive call to a technician at the first sign of strange behavior of the equipment.
Sometimes the reason lies in a banal violation of operating rules, for example, improper loading of the chamber or installation of the device near a heat source. However, this signal cannot be ignored, since prolonged operation in abnormal mode can lead to failure of expensive components, such as motor-compressor. In this article we will analyze in detail all possible causes and ways to eliminate them.
The principle of operation of the cooling system and the distribution of cold
To understand why the cold is concentrated in one zone, it is necessary to consider the basic principle of refrigerant circulation. In classic models with a drip system freon passes through the evaporator located on the rear wall, cooling it, and then the air is distributed by natural convection. In systems No Frost a fan is responsible for this process, which forcibly drives cold air through special air ducts.
If you notice that one side of the chamber is significantly colder than the other, this may indicate a violation of the circulation of air masses. Evaporator may be covered with an ice crust unevenly, or the damper that regulates the air flow is stuck in a certain position. The electronic control module receives data from the sensors and tries to compensate for the temperature, but a mechanical obstruction makes these efforts futile.
⚠️ Attention: If you hear extraneous noise or humming from the side where there is no cooling, this may indicate that the fan is working, but air is not passing through a clogged duct.
In two-compressor models, a separate cooling circuit is responsible for each chamber. If in such a refrigerator one side (for example, the left side of the refrigerator compartment) does not freeze, the problem may be localized in a specific one that does not open the freon supply to the desired evaporator. Diagnostics here requires checking the electrical valve control circuit. solenoid valve, which does not open the freon supply to the desired evaporator. Diagnosis here requires checking the electrical valve control circuit.
Main reasons for uneven cooling in the refrigerator compartment
There are a number of typical malfunctions that lead to the described problem. Most often, the problem is not that the refrigerator has “forgot how” to freeze, but that the heat physically cannot be removed from a certain area. One of the main culprits is clogged capillary tube. When a plug of technical dirt or congealed oil forms in a narrow channel, the refrigerant stops circulating in full, and cooling occurs only at the beginning of the circuit.
Another common reason is freon leak. When the amount of refrigerant in the system decreases, there is not enough of it for the entire volume of the evaporator. As a result, the cooling capacity drops sharply, and cold has time to form only in the first section of the radiator, usually located on one of the sides. It is difficult to determine a leak visually; often this is only indicated by swelling of the rear wall or the absence of a characteristic hissing when punctured.
Do not discount the breakdown of thermostat or the temperature sensor. If the device “lies” and sends a signal to the compressor that the chamber is already cold enough, the motor will turn off ahead of time. In this case, the area near the evaporator will be cold, and the far corners will be warm.
- 🧊 Evaporator freezing: Ice blocks the exit of cold air into one of the parts of the chamber.
- 💨 Fan malfunction: The blades may be broken or the fan motor burned out, which stops circulation.
- 🚪 Problems with the seal: Loose fit of the door on one side lets in warm air, which does not have time to cool down.
- ❄️ Malfunction of the defrosting heating element: The system does not defrost, and the ice coat blocks the air supply channels.
Problems with the freezer and the No Frost system
In freezers, the system No Frost works most intensively. If the freezer only freezes on one side, this often indicates a violation of the air flow geometry. The channels through which cold air enters the chamber may become clogged with food crumbs or ice jams. Visually, this manifests itself as a layer of frost in one corner and its complete absence in the other.
It plays an important role, which regulates the amount of cold air flowing from the freezer into the refrigeration compartment (in single-compressor models). If the damper mechanism is stuck closed, cold will not flow evenly into the upper chamber. The electronics may indicate normal temperature, but physically the air does not pass through the blocked channel. damper, which regulates the amount of cold air flowing from the freezer into the refrigerator compartment (in single-compressor models). If the damper mechanism is stuck closed, cold will not flow evenly into the upper chamber. The electronics may indicate normal temperature, but no air is physically flowing through the blocked duct.
⚠️ Attention: Trying to forcefully open the damper by hand without turning off the power can lead to breakage of the plastic drive gears. Carry out all manipulations only with the device de-energized.
It is also worth checking the condition defrost heater. If it burns out, ice builds up on the evaporator, which is often located behind the back panel or in a niche on one side. The ice acts as a heat insulator, and the cold stops being transmitted into the chamber, creating the illusion that one side is not working.
☑️ Diagnostics of the No Frost system
Diagnostics of the compressor and refrigerant
The heart of the refrigerator is compressor. If it works intermittently, does not develop the required pressure, or hums but does not start, the circulation of freon is disrupted. In such cases, a situation is often observed where the condenser (grid at the back) is warm only on one side or hot only in the lower part. This is a direct sign that the refrigerant does not go through the full cycle.
When freon leak the pressure in the system drops. Freon boils and evaporates in the first part of the evaporator, not reaching the end of the circuit. This can be seen visually if you carefully remove the back panel of the freezer (in No Frost models): the evaporator will be covered with frost only on 30-40% of its area. The remaining part of the radiator will remain warm or cold, but without frost.
Diagnostics of the compressor requires special instruments - pressure station. The technician connects to the service connection and checks the suction and discharge pressure. Low suction pressure with the engine running almost always indicates a leak or blockage.
| Symptom | Probable cause | Check method |
|---|---|---|
| Frost on only 1/3 of the evaporator | Freon leak | Visual inspection, soap solution |
| Compressor is hot, but does not freeze | Capillary clogged | Pressure measurement, current check |
| Cold only at the rear wall | Fan faulty | Audit check, inspection of blades |
| Temperature fluctuates | Thermostat is faulty | Check contacts, replace |
Is it possible to add freon yourself?
Self-refilling with freon without evacuation of the system and searching for leaks is a temporary measure that will lead to breakdown of the compressor in a short time. There should be no air or moisture in the system.
The influence of external factors and operating rules
Before you commit a breakdown, analyze how you use the refrigerator. If you place a hot pan next to the right wall or tightly press the shelves against the left wall, disrupting circulation, the result will be the same - local overheating or hypothermia. Air circulation requires free space between the products and the walls of the chamber.
Installing a refrigerator close to the wall or in a niche without a gap for ventilation also plays a role. If the condenser (heat exchanger) cannot release heat to the environment due to lack of clearance on one side, the efficiency of the entire system decreases. The compressor begins to wear out, trying to compensate for poor heat transfer.
Check the position of the refrigerator itself. If it stands on an uneven floor and is tilted to one side, the door may not close tightly on the side where the misalignment has occurred. Warm air will be constantly sucked inside, and the sensors will drive the compressor in continuous mode, but there will be no uniform cold.
- 📏 Gap near the wall: Minimum 5-10 cm from the back and side walls to the furniture.
- 🥘 Food temperature: Do not put hot air inside, this upsets the balance temperature.
- 🧹 Grill cleanliness: Dust on the condenser at the back reduces heat transfer.
⚠️ Attention: Specifications and installation requirements may vary between manufacturers. Always check the instructions for your specific model Samsung, LG or Whirlpool regarding the minimum distances to the walls.
What to do: step-by-step instructions and when to call a specialist
If you find uneven cooling, start with simple steps. First, defrost your refrigerator completely. This will take from 10 to 24 hours. If after defrosting and turning it back on a day later the problem disappeared, it means that the problem was in the defrost system or an ice jam. If the situation repeats itself after a week, repairs are required.
Secondly, listen to the operation of the unit. Is the fan humming? Does the compressor start? Does the relay click? These sounds help narrow down your search. If you do not have the skills to work with a multimeter and do not know where it is starting relay, it is better not to go inside the electrical part.
Calling a technician is necessary if:
- After defrosting the problem returned.
- You can hear the sound of flowing liquid or hissing (a sign of a leak).
- The compressor hums, but does not start, or works without stopping.
- Blisters or oily spots are visible on the back wall.
Why does the refrigerator freeze more at the top than at the bottom?
In models with a drip system, cold air is heavier than warm air and sinks down. However, if the evaporator is located at the top (behind the panel), then the area immediately next to it will be the coldest. If the temperature difference is extreme, the sensor or damper may be faulty.
Can the drain hole become clogged and cause uneven cold?
A clogged drain causes water and ice to accumulate at the bottom of the chamber, which can block the lower air ducts. This will cause the bottom of the chamber to be warmer than the top, or vice versa if the ice blocks the cold outlet. Cleaning the drainage with a soft wire or a brush often solves the problem.
How often do you need to defrost a No Frost refrigerator?
The system No Frost does not require manual defrosting to remove ice, as it does it automatically. However, once every year or two it is recommended to turn off the device to wash and remove bacteria. Frequent defrosting unnecessarily can negatively affect the life of the compressor.
Is it dangerous to operate a refrigerator if it freezes only on one side?
For a short time - not dangerous for humans, but dangerous for food (risk of spoilage). Long-term - dangerous for equipment. The compressor works with overload, trying to catch up with the temperature in the “warm” zone, which can lead to its combustion or wedge.
Why, after replacing the compressor, did the refrigerator begin to freeze unevenly?
This may indicate an installation error: insufficient evacuation of the system, incorrect dosage of oil or freon, or the presence of moisture in the circuit. There could also be a blockage in the filter-drier if it was not replaced along with the compressor.