Many owners of household appliances notice small holes on the shelves or inner walls of the chamber, the purpose of which is not always obvious at first glance. These design elements are not a manufacturing defect or an accidental defect, but play a critical role in the operation of the system No Frost or drip defrosting. Understanding their function will help you avoid common operating mistakes and extend the life of your unit.
In modern models, be it Indesit, Bosch or LG, these holes ensure the circulation of air masses and removal of excess moisture. If you neglect their condition, you may encounter the formation of an ice crust, increased humidity, and even spoilage of food. Let's take a closer look at exactly what tasks these technical elements perform.
⚠️ Attention: Never try to seal or plug these holes with tape or cotton wool, as this will disrupt the thermodynamic cycle of the compressor.
Condensate and moisture removal system
The main reason for the appearance of the hole on the back wall or in the recess under the shelves - this is the need to remove moisture. During operation of the compressor, condensation settles on the internal surfaces of the chamber, which is formed due to the temperature difference. In refrigerators with drip system moisture flows through grooves into this hole, from where it is discharged through a tube into a special tray above the motor.
Here the water evaporates naturally, without requiring user intervention. If this channel becomes clogged with crumbs or ice, water will begin to pool at the bottom of the refrigerator, creating puddles under the crisper drawers. Regularly checking the cleanliness of the drainage channel is the key to dryness inside the chamber.
- 💧 Ensures unhindered flow of water into the evaporator.
- 🌡️ Prevents the formation of ice on products.
- 🛡️ Protects shelves from constant contact with water.
- 🔄 Maintains an optimal level of humidity.
Air circulation in the No Frost system
In models equipped with the system No Frost, the holes perform an even more complex function of distributing cold air. A fan located behind the rear wall forces cooled masses, which pass through special channels and holes in the shelves. This ensures an even temperature in all corners of the chamber, no matter where you place the food.
Overflow channels are often hidden from view, but their outlets are visible on the side walls or at the ends of the shelves. They allow air to move freely between compartments, preventing stagnation. If these paths are blocked by densely packed products, the cooling efficiency drops sharply, and the compressor begins to work with increased load.
It is important to understand that the location of these holes was calculated by engineers with mathematical accuracy. By covering them with pots or bags, you create “dead zones” where the temperature can be higher than normal. This is especially dangerous for perishable products that require strict adherence to storage conditions.
Technological holes for shelves
The holes located directly on glass shelves or plastic grilles deserve special attention. They serve to improve aerodynamics inside the chamber. Cold air is heavier than warm air, so it tends to sink, and warm air tends to rise. Holes in the shelves allow these flows to mix and circulate, leveling out the temperature background.
In addition, such holes are often used to install additional accessories: bottle holders, dividers or baskets. The design of many shelves provides for the possibility of dismantling certain sections, which also requires the presence of technological gaps and fastenings.
| Type of hole | Location | Main function | Risk of blockage |
|---|---|---|---|
| Drainage | Rear wall, bottom | Condensate drain | High (clogging, ice) |
| Ventilation | Rear/side wall | Air circulation | Medium (products) |
| Shelf | Shelf glass | Heat transfer | Low (dishes) |
| Fixing | Side walls | Installation of shelves | Absent |
⚠️ Attention: When installing a new shelf, make sure that its holes coincide with the air ducts, otherwise, the upper part of the chamber will be much warmer.
The influence of holes on energy efficiency
The correct operation of the ventilation system directly affects energy consumption. When air flows freely through the provided openings, temperature sensors detect cooling faster. The compressor turns off in time, without wasting excess energy on idle operation.
If the holes are blocked, cold air does not reach the sensor, and the unit continues to freeze. This leads not only to an increase in electricity bills, but also to accelerated wear of the motor. Energy efficiency Class A or A++ is achieved precisely thanks to competent air flow engineering.
Why does a refrigerator hum?
Often the humming intensifies if it is damaged air circulation. The fan begins to work harder or vibrate due to increased resistance to air flow.
Users often underestimate the importance of free space around food. By loading the refrigerator to capacity, we block natural ventilation. It is recommended to leave gaps between the products and the back wall so that air can freely pass through the technological holes.
Problems with holes and their solutions
The most common problem that owners face is freezing of the drainage hole. In winter or when the door is opened frequently, moisture can turn into an ice plug right at the entrance to the channel. This can be easily diagnosed by the presence of water at the bottom of the refrigerator compartment.
To fix the problem, you need to defrost the unit. After complete thawing, the ice plug will disappear and the water will begin to drain again. If the problem returns regularly, the door seal may be broken or the thermostat is faulty.
- 🧊 Check the drainage regularly for ice.
- 🧹 Clean the inlet with a soft cloth.
- 🔍 Inspect the shelves on item of integrity.
- ❄️ Do not place hot foods near the walls.
☑️ Diagnostics of the drainage system
Care and prevention of blockages
In order for the holes to perform their function flawlessly, it is enough to follow simple hygiene rules. Once every six months, it is recommended to carry out preventive cleaning of the drainage channel. To do this, you can use warm water poured through a funnel, or a special cable.
It is also important to keep the shelves clean. Over time, grease deposits can clog small ventilation holes in the glass, impairing heat transfer. Wash the shelves with warm water and a mild detergent, rinsing them thoroughly.
Do not forget that the design of your refrigerator is a complex mechanism where every detail matters. Timely cleaning of the drainage hole takes 5 minutes, but it saves you from expensive repairs of the compressor. Taking care with your equipment is the best way to avoid unexpected expenses.
Is it possible to wash the holes with water under pressure?
It is not recommended to use water under high pressure, as this can damage internal elements or drive moisture into the insulation. It is better to use a syringe or syringe to carefully drain the channel.
What to do if warm air blows through the hole?
This may indicate a malfunction of the valve or problems with the No Frost system. If the situation has not changed after defrosting, you need to call a technician for diagnostics.
Do I need to lubricate the holes with oil?
Absolutely not. Oil can harden at low temperatures, creating an impenetrable plug that is very difficult to remove. Use only water or special means for defrosting.