When using the refrigerator compartment every day, we rarely think about its complex internal structure, but a careful eye may notice various holes on the back wall or at the bottom of the chamber. These design elements are not a manufacturing defect or an accident, but perform strictly defined engineering functions that ensure stable operation of the entire unit. Understanding their purpose helps owners avoid panic when moisture or ice is detected in the wrong places.
Most often, users are interested in the question of the drainage channel, which serves to remove condensate formed during the natural operation of the cooling system. If you notice that the water has stopped draining or a puddle has appeared under the vegetable boxes, this is a direct signal that drainage hole needs attention. Ignoring this fact can lead to spoilage of food and the appearance of an unpleasant odor, which is subsequently difficult to remove.
In this article we will analyze in detail exactly what holes may be located inside your refrigerator, what they are responsible for and how to properly care for them. You will find out why some of them should absolutely not be touched, while others require regular preventive maintenance. This knowledge will extend the life of your equipment and maintain its efficiency for many years.
The main purpose of the drainage hole
The central element that raises the most questions is the drainage hole, located, as a rule, in the lower part of the rear wall of the refrigerator compartment. Its main task is to remove melt water that forms on the evaporator during defrosting cycles. In modern models with a system No Frost or Low Frost this process is automated, but the physical channel for water drainage remains a necessary design element.
When the compressor is turned off, the ice on the hidden evaporator melts, and the resulting moisture flows down by gravity. If this hole did not exist, water would accumulate at the bottom of the chamber, creating an ideal environment for bacteria and mold to grow. It is through this channel that the liquid enters a special tray located above the compressor, where it safely evaporates under the influence of the heat of a running motor.
The diameter of this channel is usually small, which often causes it to become clogged. Crumbs from food, pieces of packaging or mucus from bacteria can completely block the passage. As a result, water begins to overflow the edge of the groove and spread along the bottom of the refrigerator, and then flow out through the door seal. Regular checking of this element is the key to dryness inside the chamber.
It is important to distinguish a standard drainage hole from technological gaps. Drainage always has a visible groove or funnel, while other gaps can be hidden by plastic panels. If you are not sure which hole is in front of you, it is better to refer to the model instructions Indesit or Bekoto avoid damaging important components.
⚠️ Attention: Never try to clean the drainage hole with a sharp metal wire or knitting needle. You can puncture the thin evaporator tube, which will lead to a freon leak and costly repairs.
Technological holes for sensors and thermostats
In addition to drainage, there may be small holes inside the chamber intended for installing temperature sensors or capillary tubes of a thermostat. These elements are critical to maintaining a given temperature. Through them, the control system receives data about the current climate inside the chamber and makes a decision to turn the compressor on or off.
In old models of refrigerators, such as Soviet ZIL or early Atlanta, one could see a protruding thermostat tube passing through a hole in the wall. In modern units, these components are often hidden behind decorative panels, but openings for access to them or for their operation remain. Failure to seal around such areas may result in incorrect sensor readings.
If you plan to rearrange shelves or change the configuration of the internal space, make sure that you do not block air access to these sensors. A closed sensor hole will cause the refrigerator to “think” that it’s already cold inside and stop freezing until the food starts to spoil. Air circulation this area should be free.
Sometimes such holes are closed with plastic plugs, which users mistake for a defect and try to remove. This should not be done, since moisture can penetrate through them into the insulating layer of polyurethane foam, which will reduce the thermal insulation properties of the housing. Over time, this will lead to increased energy consumption.
Air circulation system and holes in the partitions
In refrigerators with the system No Frost you can notice many holes on the back wall and in the partitions between the chambers. They are part of a complex system of air channels through which a fan drives cold air from the evaporator into the chamber and back. Without this network of holes, uniform cooling of products would be impossible.
The air in such models moves in a closed loop. The cooled stream exits through the upper openings, falls down, flows around the products and returns through the lower openings to the evaporator for re-cooling. If these channels are filled to the top with food, it will be broken heat exchange, and the efficiency of the refrigerator will drop sharply.
- ❄️ The upper holes serve to supply cold air into the chamber.
- 💨 The lower channels are designed to return warm air to cooler.
- 🔄 Side openings can regulate the flow between the refrigerator and freezer compartments.
It is important for users to know that covering these openings with tape or blocking them with large pans is unacceptable. This will not only worsen cooling, but can also lead to freezing of the fan itself, which will cause characteristic noise and eventual breakdown of the motor. Make sure that the food lies at least 2-3 centimeters from the back wall.
Why the drainage gets clogged and how to fix it
The most A common problem faced by refrigerator owners is a clogged drain hole. The reasons may be trivial: bread crumbs, pieces of labels, mold deposits or simply an accumulation of thick mucus. When the passage of the channel is disrupted, water begins to accumulate at the bottom of the refrigeration chamber.
To fix this problem, you do not need to call a technician. You will need a soft rubber bulb (enema) or a special brush, which often comes with refrigerators. If you don’t have a brush, you can use a soft wire with a curved end, pre-wrapped with cotton wool, so as not to damage the plastic. LG And Samsung. If you don’t have a brush, you can use a soft wire with a bent end, pre-wrapped with cotton wool, so as not to damage the plastic.
The cleaning process is as follows: first remove visible debris from the funnel, then carefully insert the tool into the hole and make several rotational movements. After this, fill the bulb with warm water and rinse the channel under pressure. The water should flow freely without lingering at the bottom.
If water stands in the channel and does not drain even after cleaning, an ice plug may have formed deeper in the tube. In this case, you can use a special defroster or simply leave the refrigerator turned off for 10-12 hours to completely thaw the ice inside the channel.
☑️ Checklist for cleaning the drainage
Table: Types of holes and their characteristics
For the convenience of systematizing knowledge about the internal structure of the refrigerator, we present the main types of holes that you may encounter and their key features. This will help to quickly identify the element that raises questions.
| Hole type | Location | Function | Can it be touched? |
|---|---|---|---|
| Drainage | Bottom of the rear wall | Condensate drain | Yes (cleaning) |
| Technological | Rear wall, corners | Installation sensors | No (risk of depressurization) |
| Air channels | Along the entire back wall | Air circulation | No (cold disturbance) |
| Thermostat hole | Inside the chamber (old models) | Temperature control | Danger (risk of breakdown) |
As can be seen from the table, most of the holes should not be touched unless absolutely necessary. The only exception is the drainage channel, which requires periodic maintenance. It is better not to disturb the remaining elements so as not to disturb the factory settings and the tightness of the circuit.
Typical errors during operation and maintenance
Many users, trying to improve the operation of the refrigerator or simply restore order, make mistakes that can lead to breakdown. One of the most common is an attempt to widen the drainage hole with a drill or knife. This is strictly forbidden to do, since the walls of the channel are very thin and easily damaged.
Another common mistake is sealing the holes for air circulation if, in the owner’s opinion, they “spoil the appearance” or “blew cold out.” Users do not realize that they are blocking vital arteries of the system. As a result, the compressor works without interruption, trying to compensate for the lack of circulation, and burns out.
It is also a mistake to use aggressive chemicals to clean the drainage. Acids or alkalis can corrode the plastic of the groove or damage the rubber seals inside the tube. Use only warm water or special safe products for household appliances.
⚠️ Attention: If after cleaning the drainage the water still does not go away, the problem may not be in the hole, but in the freezing of the outlet tube in the freezer area. In this case, complete defrosting of the refrigerator is required within 24 hours.
What will happen if you ignore the clogged drainage?
If water constantly stands at the bottom, it will begin to seep under the plastic and get into the thermal insulation layer. This will lead to corrosion of the metal case from the inside, the appearance of rust and an unpleasant odor that cannot be removed. In the worst case, water will reach the electrical contacts.
Prevention and proper care of internal elements
In order for the holes inside the refrigerator to always perform their functions, it is enough to follow simple operating rules. First of all, pay attention to the packaging of products: all bulk and small items must be hermetically sealed. This will prevent debris from entering the drainage system.
Regularly, at least once every six months, conduct a visual inspection of the bottom of the refrigerator compartment. Make sure there is no dirt in the drain funnel. Preventive rinsing with warm water will only take a couple of minutes, but will save you from a flood in the kitchen.
Do not overload the shelves with products, especially near the back wall. Leave space for free air circulation. This will not only ensure better storage of products, but will also reduce the load on the compressor, extending the life of the entire unit.
Following these simple recommendations will allow you to forget about problems with condensation and ice. Your refrigerator will operate quietly and efficiently, and your food will remain fresh for as long as possible. Remember that maintenance is not a complicated science, but regular care of equipment.
Often asked questions (FAQ)
Is it possible to pour boiling water into the drainage hole for cleaning?
It is not recommended to use boiling water, since a sharp temperature change can damage the plastic of the funnel or cause cracks in the tube. It is better to use warm water at a temperature of 50-60 degrees. If an ice blockage has formed, warm water will help melt it, but proceed carefully.
Why is cold air blowing from the hole in the back wall?
This is normal for refrigerators with the system No Frost. Through these holes, cooled air is introduced into the chamber to maintain a low temperature. If the air does not blow at all or barely blows, the fan may be faulty or the air ducts are clogged.
How can you tell that the drainage hole is completely clean?
It is very simple to check: pour a small amount of water (about half a glass) into the funnel. If the water leaves quickly and with a characteristic gurgling sound, then the channel is free. If the water stands or drains very slowly, cleaning is required.
Is it necessary to lubricate the hole with oil for better passage?
Absolutely not. The oil will create a sticky film on which dust and debris will stick, leading to an even faster and denser clog. In addition, oil can react with plastic or rubber, destroying them.