Having discovered that the surface of the housing is between the main compartment and freezer have become hot, many owners of household appliances begin to panic. There is a fear of a short circuit, compressor failure, or even fire. However, in most cases, this is not a sign of a malfunction, but the normal operation of the system No Frost or drip defrosting.
Modern refrigeration units are designed in such a way that the heat from the condenser is not wasted, but is used to prevent the formation of condensation on the outer walls. It is this physical process that often surprises users who first encounter hot jumper. Understanding the principles of heat transfer will help you stop worrying about trifles.
However, there are situations where the heating becomes excessive and indicates real problems in the refrigerant circuit or electronics. It is important to be able to distinguish normal work from a critical situation requiring the intervention of a specialist. In this article we will analyze all possible reasons, from normal modes to serious breakdowns.
The principle of operation of the anti-condensation system
The main reason why the space between the chambers becomes warm lies in the presence of so-called heating tubes. They are part of the refrigerant circuit and are routed inside the housing walls. When the compressor pumps hot freon, it passes through the condenser and is then directed into these tubes before entering the freezer.
The purpose of this engineering design is to raise the surface temperature of the cabinet in areas of high humidity. If the walls remained cold, condensation would instantly form on them, flowing onto the floor and causing corrosion of the metal. Heating to a temperature of 40-50 degrees Celsius is considered absolutely normal an indicator for a working device.
The heating intensity directly depends on the operating mode of the compressor. During hot weather or when the door is opened frequently, the engine runs longer, pumping more hot gas through the system. Therefore, in the summer months, the partition may seem noticeably hot to the touch, which is not a defect.
⚠️ Attention! If the surface temperature exceeds 60 degrees (it is impossible to hold your hand for more than 2-3 seconds), this may indicate an overload of the system or a clogged capillary tube.
Effect of the fast freezing mode
Often users notice strong heating of the partition immediately after turning on the function Super Freeze or "Quick freezing". This mode forces the compressor to work non-stop at maximum speed in order to quickly cool a large volume of products.
In this state, the heat removal system operates in extreme mode. Hot freon circulates at high speed, and the heat exchangers do not have time to cool down. The partition between the chambers at this moment can heat up much more than usual.
After the food freezes and the thermostat turns off the compressor, the temperature of the walls will begin to gradually decrease. Typically, this process takes from 3 to 8 hours, depending on the volume of loaded products and the ambient temperature in the room.
How long does the fast freezing mode work?
In most models, this mode turns off automatically after 24-48 hours. However, in some older models Indesit or Atlant the button must be pressed again to turn it off.
If you have just placed several kilograms of meat or vegetables in the freezer, activating this mode is inevitable. You should not worry about heating during this period if the refrigerator does not make any extraneous sounds and continues to cool the food.
Improper installation and ventilation
One of the common reasons for overheating of the outer walls is a violation of installation rules. For effective heat exchange, the refrigerator requires free air flow. If the unit is installed in a niche without gaps or moved close to the wall, the heat simply has nowhere to go.
The instructions for any model indicate the minimum distances to walls and furniture. Ignoring these requirements leads to hot air accumulating around the body, increasing the overall temperature of the equipment. This forces the compressor to work even harder, creating a vicious circle.
- 🔥 The minimum gap at the back should be at least 5-7 cm.
- 🔥 It is recommended to leave at least 2-3 cm of free space on the sides.
- 🔥 On top of the refrigerator there should be a gap of at least 10 cm for outlet of warm air.
The situation is especially critical when the refrigerator is built into a kitchen unit without a special ventilation grille in the base or upper part of the cabinet. In such cases, the heating of the partition can become constant and very strong.
⚠️ Attention! It is prohibited to install the refrigerator closer than 50 cm to heating appliances or stoves. This upsets the thermal balance and can lead to compressor failure.
Clogged system and problems with the refrigerant
If the partition between the refrigerator and freezer is hot, and the temperature inside the chambers does not drop to the required values, this may indicate a technical malfunction. Most often, this indicates clogging of the capillary tube or a partial leak of freon.
When clogged, the refrigerant cannot circulate normally through the system. The pressure at the outlet of the compressor increases, which leads to strong heating of the discharge tube and, as a result, all elements of the circuit, including anti-condensation tubes in the partition.
In the event of a freon leak, the compressor tries to compensate for the lack of refrigerant by working without interruption. This also causes overheating, but at the same time the freezer stops freezing, and water may even appear in the refrigerator compartment.
| Symptom | Probable cause | Action |
|---|---|---|
| It gets very hot, freezes weakly | System clogged or air | Call a technician |
| Heats up, but doesn’t freeze at all | Freon leak | Leak diagnostics |
| Heats moderately, freezes good | Normal (operating mode) | Observation |
| Heats up only when the button is on | Super Freeze mode | Disable function |
It is impossible to remove the blockage or find a micro-leak on your own. Special equipment is required to evacuate the system and charge it with freon. Attempts to “pump” the system on your own can lead to final breakdown of the compressor.
Failure of the thermostat or sensors
Temperature sensors and sensors are responsible for the operation of the compressor thermostats. If these elements fail, they can send incorrect signals to the control board. As a result, the compressor receives a command to work continuously, ignoring the fact that the desired temperature has been reached.
In modern electronically controlled models, the evaporator sensor or defrost sensor is responsible for this. In older mechanical models, the thermostat itself. If the contacts stick or the sensor breaks, the refrigerator “does not understand” that it needs to stop.
Constant operation of the engine leads to hot gas constantly circulating around the circuit. The partition between the chambers becomes hot under such conditions, and a “coat” of ice may form inside or, conversely, all products may freeze.
- ❄️ Check to see if the back of the freezer is frozen.
- ❄️ Listen for a characteristic click when the compressor turns off after 20 minutes operation.
- ❄️ Try turning the thermostat knob to the “0” or “Off” position.
If, when turning the regulator to the off position, the compressor continues to hum and the partition heats up, the problem is most likely a sticking start relay or a malfunction of the thermostat itself.
☑️ Diagnostics of the thermostat
Design features of different brands
It is worth noting that the heating intensity of the partition depends on the manufacturer and the specific model. Engineering solutions may differ radically. For example, some models Liebherr use a cold distribution system that minimizes heating of the external walls.
At the same time, budget models often have a simpler tube layout, where the circuit runs directly along the perimeter of the doorway. This makes the heating more noticeable, but no less effective in combating condensation.
Owners of equipment with two compressors should be aware that only the zone corresponding to the running motor is heated. If the freezer is turned on, the upper part of the partition will heat up, and vice versa.
Studying the technical documentation for your specific model will help you understand whether the level of noise and heating declared by the manufacturer is the norm. Often this information is contained in the “Normal Operation” section of the operating instructions.
Why do the sides of some models get hot and others not?
It depends on the location of the capacitor. In older models it was at the back (black grille), so the sides did not get warm. In modern built-in and free-standing models, the capacitor is often hidden in the walls of the case for aesthetics.
When to call a professional
Although heating is often the norm, there are “red flags” that cannot be ignored. If you observe a combination of heating with other alarming symptoms, operation of the device should be suspended.
The first signal is the appearance of a burning smell or melted wiring. This may indicate overheating of the wire insulation or a malfunction of the compressor start relay. In this case, you must immediately turn off the power to the device.
The second sign is a change in the consistency of the refrigerant or the appearance of oily spots under the refrigerator. This indicates depressurization of the circuit. The third sign is that the compressor works for days without a single stop, making uncharacteristic sounds.
⚠️ Attention! If you notice sparking in the outlet or power cord area, do not attempt to repair the refrigerator yourself. Immediately turn off the machine in the control panel and call a specialist.
Timely diagnostics allows you to avoid expensive compressor repairs. Replacing the seal or cleaning the system is much cheaper than replacing a motor that has failed due to overheating.
Is it normal if it is hotter between the chambers than in the summer?
Yes, this is normal. In winter, the room may be cooler, but if the heating is on, the temperature difference affects the operation of the refrigerator. However, more often in summer the heating is more noticeable due to the high temperature in the room.
Is it possible to stick thermal insulation on a hot partition?
It is absolutely not possible. Heat must leave the system. Sticking insulation will lead to overheating of the compressor and its rapid breakdown. Heat exchange must occur freely.
Why is only the upper part of the partition heated?
This is typical for single-compressor models. Hot freon first passes through the circuit of the freezer (which is usually on top), so the upper part of the partition heats up more than the lower part.
Does the fullness of the refrigerator affect the heating of the walls?
Yes, it does. An empty refrigerator reaches the set temperature faster and turns off. When filled with products (especially warm ones), the unit runs longer, which causes stronger and longer heating of the partition.
What to do if the refrigerator is in a niche and gets very hot?
It is necessary to provide forced ventilation. You can install a small fan in the upper part of the niche or make additional holes in the furniture for air circulation.