Faced with a situation where the side surfaces or back of the refrigeration unit become warm to the touch, owners technicians LG often begin to panic. This is a natural reaction, because we are accustomed to the fact that a refrigerator should store cold and not emit heat. However, in most cases, heating of the walls is the normal operating mode of a modern climate system, and not a sign of a critical malfunction.
Corporation engineers have introduced advanced heat removal technologies, which are radically different from older models with open grid condensers at the back. Understanding the physical processes occurring inside the circuit will help you distinguish normal operation from a real breakdown that requires the intervention of a technician.
In this article we will analyze in detail the principles of operation of the system No Frost, explain why specific areas of the case heat up, and point out the symptoms for which it is necessary to sound the alarm. You will learn to diagnose the condition of your equipment without extra costs.
Physics of the process: where does the heat go?
The operating principle of any refrigerator, be it a budget model or a premium one LG InstaView, is based on the circulation of the refrigerant. Freon, passing through the compressor, is compressed and heats up sharply, after which it enters the condenser. This is where heat is released into the environment, and in modern models the role of this heat exchanger is played by the metal walls of the case or the tubes hidden inside them.
When you notice that the sides are warm, this means that the heat removal system is functioning correctly. If the walls remained cold while the engine was running, this would indicate a depressurization of the circuit or a lack of freon. The surface temperature can vary from 30 to 50 degrees Celsius depending on the load.
Heating is especially intense during the hot season or immediately after loading a large volume of room temperature products. During such periods compressor works at higher speeds, trying to quickly cool the chambers, which naturally increases the heat release of the condenser built into the walls.
It is important to understand that the housing material (metal) has high thermal conductivity, so it quickly transfers heat from the internal tubes to the outer surface. This is a design feature, and not an insulation defect.
⚠️ Attention: If the temperature of the walls exceeds 60 degrees (it hurts to hold your hand for more than 2-3 seconds), and the refrigerator does not cool inside, this may indicate a clogged capillary tube or overheating of the motor.
There is a misconception that the refrigerator should warm up only in the back. In models LG with the system Total No Frost the circuit often runs along the entire perimeter, including the side panels, which ensures more uniform heat distribution and operating efficiency.
Design features of LG models
The equipment of the South Korean brand is famous for its aesthetics and minimalism, which directly influenced engineering decisions. To avoid protruding radiator grilles at the rear, which collect dust and interfere with installation, the developers hid the capacitor inside the case. This solution made it possible to make the back wall smooth and transfer the heat transfer function to the side panels.
In some models, for example, in the series LG DoorCooling+, an additional supply of cold air is used, but the principle of heat removal through the walls remains unchanged. This arrangement requires good ventilation around the unit, which users often forget about during installation.
Heating may be uneven: sometimes the right side becomes warmer, sometimes the left, or the heat is concentrated in the upper part of the sides. This depends on the layout of the condensate pipes in a particular modification and the current phase of the cooling cycle.
It is worth noting that in two-compressor models (less common) or in units with a freshness zone Linear Cooling, the thermal regime may differ from standard single-compressor versions. Here it is important to check the technical documentation of your particular model, since the circuitry may vary.
When heating is normal
You can determine that your refrigerator is operating normally by a number of signs. Firstly, the heating should be noticeable, but not burning. Secondly, it is often cyclical in nature: the walls warm up while the motor is running and cool down when it is resting.
There are several standard situations in which an increase in the body temperature is absolutely normal and does not require repair. In these cases, the system simply performs its task of maintaining the microclimate inside the chambers.
- 🔥 First start: After being plugged in or defrosting, the refrigerator works in enhanced mode to reach the target temperature, which causes strong heating of the walls.
- 🍲 Loading warm products: If you put a pot of soup or a bag of groceries from the store, the compressor will work longer, intensively removing heat through the walls.
- ☀️ High ambient temperature: In the summer or when the refrigerator is located near the stove or radiator, the temperature difference increases and heat transfer becomes more noticeable.
- ❄️ Super-freezing mode: When activated functions
Super FreezeorExpress Coolthe equipment works at the limit of its capabilities.
If, after stabilizing the temperature inside the chambers (usually 3-5 hours after loading), the walls gradually cool down or become slightly warm, and the cold remains inside, it means that your LG everything is fine. Don't worry about periodic changes in surface temperature.
Causes of excessive overheating
There are situations when heating goes beyond normal limits and indicates problems. If the side is so hot that it is impossible to touch it, or the heating does not stop for days, it is worth carrying out diagnostics. Most often, the reason lies in violation of operating conditions or malfunctions of components.
One of the most common reasons is insufficient ventilation. The refrigerator needs space for air circulation. If it is pressed tightly against a wall or in a niche, the hot air has nowhere to go, and the housing and compressor overheat.
Another common problem is a malfunction of the thermostat or temperature sensors. If the sensor “lies” and reports that it is warm inside, the compressor will work continuously without going into rest. This leads to constant overheating of the walls and increased energy consumption.
⚠️ Attention: Continuous operation of the compressor without stopping for more than 12 hours in a row can lead to its combustion. If the walls are constantly “burning with heat”, check the temperature settings.
It is also worth paying attention to the condition of the door seals. If the rubber band LG is worn out, dirty, or the door is warped, warm air constantly flows inside. The motor tries to compensate for the heat influx by working non-stop, which causes abnormal heating of the external panels.
Problems with the defrosting and ventilation system
In refrigerators with a system No Frost the serviceability of the evaporator and defrost system is critically important. If the defrost heating element is burnt out or the timer is jammed, a coat of ice builds up on the evaporator. The fan stops moving air normally, heat transfer efficiency drops, and the load on the condenser (walls) increases.
In such cases, you can often hear the fan inside the freezer humming or crackling, trying to break through the ice. The walls may be very hot, but the inside of the refrigerator will be warm, since cold air does not circulate.
Another factor is contamination of the condenser with dust. Although models LG he is hidden, there may be grilles at the bottom where hot air escapes. If they are clogged with dust and animal hair, heat transfer is disrupted, and the heat remains inside the case, heating the walls.
☑️ Checking operating conditions
Checking the defrosting system often requires disassembling the rear panel of the freezer. If you see a massive piece of ice blocking the fan, then the problem is in the defrost system, and heating of the walls is only a secondary symptom of system overload.
Diagnostics and table of symptoms
To make it easier for you to navigate, we have compiled a table that helps differentiate between normal and pathological conditions. Pay attention to the combination of the temperature of the walls and the behavior of the unit itself.
| Symptom | Probable cause | Status |
|---|---|---|
| Walls are warm (30-40°C), cold inside | Normal operation of the condenser | Normal |
| Strong heating after loading products | Intense operation of the compressor | Normal |
| Hot walls, but it’s warm inside (+10°C and above) | Lack of freon or clogged capillary | Repair required |
| Heating of one point on the wall to 70°C+ | Clogging or bend tubes | Dangerous |
| Constant heating without stopping the motor | The thermostat or sensor is faulty | Replacement required |
Diagnostics should be carried out comprehensively. Don't rely only on tactile sensations. Use a thermometer to check the temperature inside the chambers: in the refrigerator it should be about +4°C, in the freezer -18°C. If the temperature inside does not correspond to the norm with hot walls, the problem is serious.
Is it possible to install a refrigerator in a niche?
Installation in a niche is possible only if strict ventilation requirements are met. Typically, a clearance of at least 10 cm is required at the top and back, as well as the presence of ventilation holes in the furniture. Otherwise, overheating and shortened service life are guaranteed.
What to do: step-by-step instructions
If you find that your LG heats up more than usual, do not rush to call a technician. Follow a series of simple steps to help resolve the problem if it is caused by external factors. Often the solution lies on the surface.
First, ensure proper air exchange. Move the refrigerator away from the wall at least 5-7 centimeters. Make sure there are no obstructions to air circulation at the back or sides. If the unit is in a niche, check the presence of ventilation ducts.
Check the temperature settings. You may have accidentally set the temperature to minimum or activated the super freeze mode. Return the settings to position Smart or set +3...+4°C for the refrigerator compartment.
Inspect the door seals. Wipe them with a soft cloth and soapy water to remove any grease or dirt that might prevent a tight seal. If the rubber band is torn or deformed, it must be replaced.
If after all the manipulations, including defrosting the refrigerator for 24 hours (with the power turned off), the problem persists and it does not cool inside, most likely there is a freon leak or a compressor failure. In this case, you cannot do without a specialist.
Why does the partition between the refrigerator and freezer heat up?
The partition (central column) often heats up more than the side walls. Heat removal pipes pass through this place and sometimes an anti-condensation protection cable is laid. Its task is to prevent the formation of dew on the ends of the doors. Heating up to 50-60 degrees in this zone is absolutely normal for most models. LG.
Is it possible to cover hot walls with thermal insulation?
It is absolutely not possible. Sticking foil, foam, or other insulating materials to the outer walls of the refrigerator will interfere with heat transfer. The condenser will stop giving off heat, the pressure in the system will increase sharply, which will lead to compressor failure or rupture of pipelines. The walls should “breathe” and give off heat.
How often should the compressor turn off?
Under normal conditions, the refrigerator operates cyclically: it works for about 15-20 minutes and rests for 30-40 minutes. However, in hot weather or when fully loaded, the operating cycle can increase to 40 minutes of work and 15 minutes of rest. If the motor hums for days without a break, this is a sign of a malfunction.
Does the amount of food affect the heating of the walls?
Yes, directly. An empty refrigerator cools down faster, but the heating of the walls at startup will also be short. A fully loaded unit with warm food will work for a long time, and the walls will be hot for a long time, until the entire volume has cooled to the specified parameters.
What to do if the refrigerator is located near the stove?
Proximity to heat sources (stove, oven, radiator, direct sunlight) is extremely undesirable. This causes the capacitor to become overloaded. If it is impossible to rearrange the equipment, be sure to install a thermal insulation screen between the stove and the refrigerator and make sure that the distance is at least 15-20 cm.