Modern models of refrigeration equipment from the South Korean brand LG are designed taking into account advanced energy efficiency and noise reduction technologies. Owners often notice that after installing a new unit or during its active operation, the side walls become noticeably warm, and sometimes even hot. This phenomenon causes natural concern, as it is instinctively associated with a malfunction or the risk of fire.
However, in most cases, heating the side panels is the normal operating mode of the system. heat removal. The designers moved the condenser tubes from the traditional rear grille into the side walls of the case to make the device more compact and quieter. Understanding the physical processes occurring inside the refrigeration circuit will help you distinguish normal operation from a real breakdown.
In this article we will analyze in detail the heat exchange mechanism, analyze situations when the wall temperature is outside the normal range, and provide an algorithm of actions for diagnosing possible malfunctions. You do not need to be an engineer to determine the condition of your LG refrigerator, just carefully study the symptoms and consistently check the key components.
Physics of the process: how heat removal works in LG refrigerators
The main task of any refrigerator is to take heat from the internal chamber and throw it into the environment. In older models, this was done using an external capacitor located at the rear in a black lattice design. In modern models LG, especially in the No Frost and DoorCoolingseries, engineers have introduced a foamed capacitor system. Pipes with hot refrigerant are mounted directly into the side walls of the housing, hidden under a layer of thermal insulation and metal casing.
When compressor starts, it compresses the refrigerant, turning it into a high-temperature gas. This gas enters the condenser, where it transfers heat to the walls of the refrigerator. This is why the side surfaces heat up. The more actively the motor works (for example, when loading food for the first time or in hot weather), the stronger the heating. This is a physical necessity: if the walls are cold, it means that heat is not removed and the system does not work.
⚠️ Attention: If the temperature of the side walls exceeds 50-60 degrees (the hand does not tolerate touch for more than 2-3 seconds), this may indicate an overload of the system or insufficient ventilation.
The normal operating cycle involves periodically turning the compressor on and off. In models with inverter motor the unit operates almost constantly, but with different power, so the sides can be warm all the time, and not just cyclically. This is a feature of the technology that allows you to maintain precise temperature and save energy.
Natural causes of heating: when you should not panic
There are a number of normal situations in which heating of the case is absolutely normal and does not require the intervention of a technician. Understanding these processes will help you avoid unnecessary anxiety and unnecessary service calls.
The first and most common reason is first start after purchase or long-term downtime. When you first turn on the unit, it must cool a large volume of air and chamber walls to the specified temperatures. During this period, the compressor LG operates at maximum power without stopping, which causes intense heating of the sidewalls. This process can last from 6 to 24 hours until the heat balance is established.
The second factor is loading a large amount of warm products. If you have placed pots with freshly cooked food in the chamber or brought a lot of food from the store, the system will have to work in enhanced mode. Heat transfer in this case it is very active, and the walls will be hot until the food cools down.
The third reason is the high ambient temperature. In summer, when the apartment is +28...+30°C, the efficiency of heat removal decreases. The temperature difference between the refrigerant and the air in the room is smaller, so the system takes more time and energy to cool. In such conditions, heating the side panels to 40-45 degrees is considered acceptable.
It is important to note that in models with the function Smart Cooling or Multi Air Flow air circulation inside the chambers also affects heat distribution. The system can briefly increase power to equalize the temperature in different zones, which also affects the temperature of the case.
Technical malfunctions that cause overheating
If heating is accompanied by other alarming symptoms or lasts for an unnaturally long time, this may indicate a breakdown. Most often, problems lie in the refrigerant circulation system or compressor control.
One of the serious problems is clogged capillary tube. If an ice plug forms in the circulation system or debris gets in, the pressure at the outlet of the compressor increases sharply. The motor begins to work with overload, trying to push the refrigerant, which leads to critical heating of not only the sidewalls, but also the compressor itself. In such cases, the refrigerator may hum more than usual or work without stopping.
Another common reason is a malfunction of thermostat or temperature sensors. If the electronic module receives incorrect data about the temperature inside the chambers, it does not give a command to stop the compressor. The unit operates 24/7, trying to achieve the non-existent “ideal cold”. This not only overheats the walls, but also leads to overfreezing of the products.
⚠️ Attention: Constant operation of the compressor without rest cycles can lead to its combustion in a matter of days. If the refrigerator does not turn off for more than 24 hours, unplug it.
It is also worth mentioning the refrigerant leak. Paradoxically, if there is a partial leak of freon, the compressor may work longer, trying to compensate for the lack of cooling capacity. However, in this case, the sidewalls are often heated unevenly: only certain areas near the compressor can be hot, and the rest of the part remains cool.
Operation and installation errors
Often the cause of overheating lies not in the equipment, but in its operating conditions. Incorrect installation is the scourge of modern kitchens, where every centimeter of space counts. However, saving space in the case of a refrigerator LG may backfire.
The main rule is availability ventilation gap. For normal heat exchange, there must be a distance of at least 5-7 cm between the side walls of the refrigerator and the furniture or wall. If the unit is built into a niche or moved close to the wall, the heat simply has nowhere to go. It accumulates, creating a “heat bag”, and operating efficiency drops significantly.
The second factor is exposure to direct sunlight or the proximity of heating devices. If the sun constantly shines on the side panel or heat blows from the stove, the thermoregulation system does not work correctly. Sensors can detect high external temperatures and make the compressor work harder. LG refrigerator The sun is constantly shining or the heat is blowing from the stove, the thermoregulation system does not work correctly. Sensors can sense high outside temperatures and cause the compressor to work harder.
☑️ Checking installation conditions
Do not forget about cleanliness Dust, pet hair, and lint that collect on the rear grille or bottom (where the condenser is located on some models) act as a heat insulator. This interferes with the normal cooling of the compressor and refrigerant before entering the circuit.
Diagnostics: table of symptoms and solutions
To quickly assess the situation, use the table below. It will help to compare the observed symptoms with the most likely causes and determine further actions.
| Symptom | Probable cause | User actions | Necessity of a specialist |
|---|---|---|---|
| The sides are warm (40°C), works cyclically | Normal operation | No supervision required | No |
| Strong heating after turning on an empty refrigerator | First start, entering mode | Wait 12-24 hours | No |
| Hot sides, does not turn off, warm inside | Lack of freon or blockage | Defrost for 24 hours | Yes, diagnostics are needed |
| Heating only at the point of contact with the wall | No gap for ventilation | Move refrigerator | No |
| The compressor is very hot, there is a burning smell | Motor overload, problems with starting | Urgently turn off the power supply | Yes, urgently |
When diagnosing, it is important to pay attention to the nature of the sound of the operating unit. A uniform hum is normal. If gurgling sounds, whistling or sharp clicks are heard, accompanied by heating, this is a sure sign of a violation of the refrigerant circulation.
It is also worth checking the tightness of the seal sealing rubber on the doors. If it is worn out or dirty, warm air constantly enters the chamber. The compressor tries to compensate for the heat inflow, working without interruption, which causes overheating of the housing.
Methods of prevention and care of the cooling system
To extend the life of your LG and avoid problems with overheating, it is enough to follow simple rules care Prevention is always cheaper and easier than complex repairs.
Check the refrigerator regularly, at least once every six months. Move the unit and check that the vents and radiator grille are not clogged with dust. To clean, use a vacuum cleaner with a soft attachment or a dry soft brush. Do not use water to clean electrical components! inspect the rear part refrigerator. Move the unit and check that the vents and radiator grille are not clogged with dust. To clean, use a vacuum cleaner with a soft attachment or a dry soft brush. Do not use water to clean electrical components!
⚠️ Attention: Before any cleaning of the rear panel, be sure to disconnect the refrigerator from the power supply to avoid electric shock.
Keep the seals clean. Wipe them with a soft, damp cloth to remove crumbs and sticky dirt. Once a year, you can lubricate the seal with a special silicone grease (or, in extreme cases, glycerin) so that the rubber does not dry out and maintains elasticity.
How to properly wash the condenser?
If you have access to the rear grille (in some models it is covered with a casing), you can carefully vacuum it. Do not use sharp objects to remove dust between the slats to avoid damaging the tubes.
Control the temperature in the room. If your heating is very hot in the winter and the air conditioning is on in the summer, try not to place the refrigerator in “dead zones” without air circulation. Ensuring the flow of fresh air to the unit is the key to its long life.
When it is necessary to call a specialist
Despite the possibility of self-diagnosis of some symptoms, there are situations when professional intervention is inevitable. Repairing the refrigeration circuit requires special equipment, licenses to work with freon and deep knowledge.
Call a technician if:
- 🛑 After defrosting for 24 hours, the refrigerator does not begin to gain cold, and the compressor continues to work without stopping.
- 🛑 There is a clear oil or refrigerant leak (greasy spots under the unit, specific smell).
- 🛑 The compressor turns on for a couple of seconds, clicks and turns off (thermal protection is triggered).
- 🛑 A “snow coat” or ice build-up forms on the walls inside the chamber, although the model supports No Frost.
Attempts to solder the tubes yourself or replace the compressor without evacuation of the system will lead to rapid damage to the new motor. Modern technology LG is sensitive to the cleanliness of the system and the amount of refrigerant charged.
Frequently asked questions (FAQ)
Is it normal for an LG refrigerator to heat up on only one side?
Yes, this is possible. In some models, the condenser circuit is laid predominantly on one side, or heating depends on which side the compressor is located on and how the air flows inside the niche are distributed. The main thing is that the temperature is not critically high.
How many degrees should it normally be on the side walls?
Temperatures in the range from 30 to 45 degrees Celsius are considered normal. To the touch it feels like “warm” or “hot, but tolerable.” If the surface burns your hand, this is a reason to check.
Can an LG refrigerator be built into a kitchen set?
Only special built-in models can be built in. An ordinary free-standing refrigerator cannot be tightly walled up in a closet. He definitely needs access to air. If you are building in a conventional model, leave large gaps and ventilation holes in the furniture.
Why did the refrigerator begin to heat up more after defrosting?
After defrosting, the compressor works in an increased mode to freeze food and cool the chambers. This is a temporary phenomenon. If after a day the situation has not returned to normal, it is possible that the circuit was damaged during defrosting or the seal was broken.