Faced with the fact that the side the wall or jumper between the chambers of your refrigerator becomes hot, many owners begin to panic. This is an absolutely normal reaction, because we are accustomed to the fact that a refrigerator should cool and not heat up. However, in most cases, an increase in temperature in this zone is the normal operating mode of modern equipment, and not a sign of a malfunction.
Physical processes occurring inside a closed refrigerant circuit require heat to be removed outside. This is why the rear grille and side panels often feel warm to the touch. If you notice that partition between the freezer and refrigeration compartments has become hot, do not rush to look for the service center number. First, you need to analyze the operating conditions and operating mode of the compressor.
In this article we will analyze in detail why the cold bridge heats up, what factors influence this process and in what cases it is worth sounding the alarm. Understanding the principles of operation No Frost systems and drip defrosting will help you distinguish normal from breakdown. We will look at the technical nuances and give clear diagnostic instructions.
The principle of operation of the heat removal system
To understand the cause of heating, you need to turn to the physics of the refrigeration unit. The refrigerant circulating through the tubes takes heat from the internal volume of the chambers and releases it to the environment. In older models, an external grille on the rear wall was used for this, which everyone is used to seeing.
Modern manufacturers, striving for aesthetics and compactness, often hide condenser tubes inside the side walls or in the partition between compartments. That is why the surface in the zone separation panel can heat up noticeably. This heat is the result of condensation of freon, which passes from a gaseous state into a liquid state, releasing the accumulated energy.
⚠️ Attention: If the surface temperature reaches such a level that it hurts to touch it with your hand for more than 2-3 seconds, or you smell burnt wiring, immediately unplug the device.
The heating intensity directly depends on the load on the compressor. The more heat that needs to be removed, the hotter the walls will be. In summer or when doors are opened frequently, this effect increases. The system simply works in enhanced mode to maintain the specified Temperature → Main mode parameters inside.
Natural causes of heating of the jumper
There are a number of situations when heating of the partition is absolutely normal and even necessary. Designers specially design heating circuits in this area to prevent the formation of condensation and icing of seals.
>Let's consider the main factors that cause an increase in temperature:
- ❄️ Anti-condensation mode: Pipes with hot refrigerant pass along the doorway to heat the rubber seal. This prevents the door from freezing and the appearance of moisture.
- 🌡️ High ambient temperature: If the kitchen is hot (above +25°C), it is more difficult for the refrigerator to give off heat, so the walls heat up more than usual.
- 🚪 Frequent opening of doors: Inflow of warm air forces the compressor to work at the limit, heating the entire circuit, including the jumper.
- 📦 Loading with warm foods: Placing a pot of soup or defrosting meat sharply increases the heat load on the system.
Particularly noticeable heating in models with the system Full No Frost. Here the fan actively circulates air, and the evaporator requires effective heat removal. The partition in such models often acts as an additional radiator. If you just turned on the refrigerator or defrosted it, heating may take several hours.
It is important to note that the case material also affects heat transfer. Metal surfaces may appear hotter than plastic surfaces at the same temperature inside. If the refrigerator is new, it can “warm up” during the first day of operation, reaching the nominal mode.
Technical faults and breakdowns
Despite the fact that heating is often the norm, there are also pathological conditions. If the partition heats up constantly and very strongly, even when the refrigerator is not full and the room is cool, it is worth checking the technical condition of the unit.
One of the common problems is a clogged capillary tube or filter-drier. In this case, the refrigerant cannot circulate normally, the pressure in the system increases, and the compressor works without stopping. This leads to overheating not only of the motor, but of the entire circuit, including the area between the chambers.
⚠️ Attention: Long-term operation of the compressor without stopping (more than 20 hours) can lead to its combustion. If you hear that the motor does not turn off, but it’s warm inside, this is an alarming signal.
Another possible reason is a freon leak. Paradoxically, when there is a shortage of refrigerant, the compressor tries to compensate for the lack of cold by constantly working. As a result, the motor winding and output tubes overheat. It is also worth checking the fan in the system No Frost: if it stops, heat is not removed from the condenser effectively.
A malfunction of the thermostat or temperature sensor may give incorrect commands to turn on the compressor. The unit “thinks” that it’s warm inside and freezes to the bitter end, heating up the outer walls. In such cases, professional diagnostics using a pressure manifold are required.
How to test a compressor by ear?
A normally operating compressor emits a smooth, quiet hum. If you hear a knocking, clanging or squeaking noise, or if the motor turns on for 2 seconds and clicks when turning off, this is a sign of a breakdown of the start relay or the motor itself.
The influence of installation and ventilation
Correct installation of the refrigerator is a key factor in its longevity and correct operation. Many users forget that the refrigerator not only stores cold, but also generates heat that must go somewhere.
If the unit is installed close to the wall or the sides are pinched by furniture, air circulation is disrupted. Heat exchange slows down, and the temperature of the case, especially in the partition area, rises critically. This creates a “heat bag” effect.
Check the following installation conditions:
- 📏 Gaps: The distance to the rear wall should be at least 5-7 cm, to the side walls - at least 2-3 cm.
- 💨 Ventilation: Make sure that the ventilation holes (if they are in the niche) are not closed.
- ☀️ Sunlight: Do not install the refrigerator in direct sunlight or near the radiator/stove.
☑️ Checking the installation conditions
Built-in appliances require special attention. If the refrigerator is built into a kitchen unit, it must have its own box with ventilation ducts. The absence of an influx of cold air from below and removal of hot air from above will lead to constant overheating and increased energy consumption.
Comparison of models: where it heats up more
Different designs of refrigerators behave differently. So that you can better navigate the features of your model, we have prepared a comparative table.
| Refrigerator type | Heating zone | Normal temperature | Features |
|---|---|---|---|
| Single-compressor | Side walls | Heat (40-50°C) | Heats alternately depending on the chamber |
| Two-compressor | Partition and side | Hot (up to 60°C) | Independent heating of circuits |
| No Frost | Rear wall inside | Moderate | The main heat is removed through the rear radiator |
| Old models | Rear grille | Very hot | The condenser is moved outside |
Models with inverter compressor, such as some series Liebherr or LG, usually heat up less, since they operate smoothly, without sudden power surges. However, in super-freezing mode (Super Freeze) they can also significantly increase the temperature of the case.
It is worth considering the volume of the refrigerator. Large units with a capacity of more than 350 liters have a more powerful compressor and a longer circuit, which naturally leads to a larger heating area. Small refrigerators under the countertop can heat up locally, but very intensely.
Methods for diagnosing and troubleshooting problems
If you suspect that something is wrong with your refrigerator, conduct an initial diagnosis yourself. This will help save time and money by calling a technician only when really necessary.
First of all, listen to the operation of the unit. The compressor should turn on and off cyclically. If it hums continuously and the temperature inside the refrigerator is higher than normal (for example, +10°C instead of +4°C), this indicates a leak or blockage.
⚠️ Attention: Never try to bend the condenser tubes yourself or pierce the system to “add freon.” This will result in permanent failure and loss of warranty.
Try the following steps:
- Defrost the refrigerator completely (at least 24 hours with the doors open).
- Check the cleanliness of the condenser at the back (if it is open).
- Make sure that the door closes tightly and the seal is clean.
- Check the thermostat settings to see if the maximum power mode is set.
If, after defrosting and checking the installation conditions, the problem persists - the partition continues to heat unbearably, and the food spoils - you need to call a specialist. He will measure the pressure in the system and check the current consumption of the compressor.
Frequently asked questions (FAQ)
Why is only the right side of the partition heated, and the left side is cold?
This may indicate uneven circulation of the refrigerant or local blockage in the circuit. It is also possible that the main condenser pipe runs from this side. If the temperature difference is critical, diagnostics are needed.
Can overheating of the partition spoil the products?
The heating of the outer wall itself does not affect the products inside if the system is working correctly. However, if overheating is caused by a breakdown (the compressor does not turn off), then the temperature inside may drop too low (freezing) or, conversely, rise due to a freon leak.
Is it normal that the partition is hot in the summer?
Yes, in the summer the temperature difference between the street and the inside of the refrigerator is large, and the system operates under increased load. Heating up to 50-60 degrees in hot weather is an acceptable norm for many models.
What to do if after defrosting the refrigerator gets even hotter?
Perhaps there is little oil or freon left in the system, or during defrosting you damaged the seal. Let the refrigerator run for 5-6 hours. If the situation does not stabilize, contact the service.