When cleaning the kitchen or during defrosting, many owners of household appliances notice a small round hole on the back wall of the refrigerator compartment. It often causes bewilderment: why did the manufacturer leave this “hole”, will it lead to a breakdown and will the cold be lost? There is absolutely no need to panic here.
In fact, this element is a critical part of the No Frost or drip defrosting system. Its presence is provided for in the design of absolutely all modern refrigerators, from budget models to premium devices. Without this hole, operation of the unit would be impossible, since moisture would have no way out.
In this article we will analyze in detail the physical principle of operation of the drainage system, explain why water leaves through this hole and what to do if it stops functioning. Understanding the structure of your refrigerator will help you avoid serious damage and extend the life of the compressor.
Functional purpose of the drainage hole
The main task of this element is to remove condensate. During operation, the refrigerator constantly cools the air inside the chambers. Warm air entering when the door is opened contains moisture, which settles on cold surfaces in the form of droplets. Also, moisture is released from foods, especially vegetables and fruits, which breathe and evaporate water.
If this “hole” did not exist, all this liquid would flow to the bottom of the chamber, freeze into ice or create puddles in which bacteria quickly multiply. Drainage hole connects the inner chamber to the evaporator system located behind the rear panel. It is there that the water flows by gravity, where it safely evaporates under the influence of the heat of the operating compressor.
It is important to understand that this process looks different in different types of refrigerators. In models with drip system (Direct Cool), the rear wall is periodically covered with frost, which melts when the compressor stops. The resulting water flows through the grooves directly into this hole. In systems No Frost moisture is removed forcibly by fans, but drainage is also necessary to remove water formed during cyclic defrosting of the evaporator.
⚠️ Attention: Under no circumstances try to seal, cover with plasticine or paint over this hole. Blocking it will lead to the accumulation of water inside the housing, corrosion of metal parts and the appearance of an unpleasant smell of rot.
The design of the hole is usually made in the form of a funnel or channel directed downwards. This is done so that cold air from the chamber does not escape out through the drainage, and water, on the contrary, easily flows inside the tube. The diameter of this channel is selected in such a way as to allow liquid to pass through, but retain large particles of debris.
The principle of operation of the moisture removal system
The mechanism for removing water is based on the laws of physics and gravity. When the refrigerator compressor At, Lg or Bosch works, the temperature on the back wall drops. Moisture from the air condenses on the surface. As soon as the set temperature is reached, the thermostat turns off the motor.
At this moment the wall begins to heat up. The ice melts and turns into water. Under the influence of gravity, drops roll down along special embossed grooves on the rear panel. At the bottom of the panel there is a collection trench that leads directly to the inlet of the drainage tube.
Next, the water enters a plastic tube, which passes through the heat-insulating layer of the housing and exits into a special container (bath) located above the compressor. The compressor becomes very hot during operation. The water from the bath evaporates into the atmosphere, completing the cycle.
- 💧 The condensate is collected in a special chute on the back wall of the chamber.
- 🔄 The water flows by gravity into the drainage hole.
- 🔥 The liquid enters the tray above the hot compressor and evaporates.
- 🌬️ In the No Frost system, the air is additionally dried by fans.
The effectiveness of this process depends on the cleanliness of the channel. If a plug of dirt or ice forms in the tube, the water does not have time to leave and begins to overflow over the edge of the gutter, ending up on the shelves of the refrigerator or at the bottom of the chamber.
Why water stopped flowing through the hole
The situation when the drainage hole becomes clogged is one of the most common reasons for contacting service centers. Users notice that there is water inside the refrigerator, food floats in puddles, and an ice crust forms at the bottom of the refrigerator. Most often, the problem lies in a banal blockage.
Particles of food, crumbs, leaves from greenery, or even small objects can get into the channel. Over time, this organic matter rots, turning into viscous mucus, which tightly clogs the narrow tube. This happens especially often if food is stored without packaging or bags of vegetables are placed close to the back wall.
The second common reason is education ice plug. This happens if the drainage channel is partially damaged, pinched, or if the temperature regime in the system is disturbed. The water in the bottleneck of the tube freezes and blocks further fluid flow. Ice can also form if water got into the hole during improper defrosting and did not have time to drain before turning on the refrigerator.
⚠️ Attention: If you notice that water not only flows inside, but also flows out under the refrigerator, the drainage tube may have jumped out of place or a crack has formed in it. In this case, simple cleaning will not help; repairs will be required.
Sometimes the cause is improper installation of the refrigerator. If the unit is not level and is tilted back, water simply cannot flow into the hole, but flows out over the edge of the gutter onto the shelf. Checking the position of the housing is the first place to start diagnosing.
Instructions: how to clean the drainage with your own hands
If you find that there is water in the chamber, do not rush to call a technician. In 90% of cases, the problem can be solved on your own in 15 minutes. First you need to completely defrost the refrigerator. Unplug it, remove all food and leave the doors open for at least 12 hours (preferably a day).
After defrosting, take a soft rubber bulb (enema) or a syringe without a needle. Fill up with warm (not boiling water!) water and try to rinse the hole with pressure. If the water drains slowly or stands still, the blockage is more serious. For mechanical cleaning, you can use a special brush, which often comes with the refrigerator, or a long soft wire (for example, from a charger) wrapped in cotton wool.
☑️ Checklist for cleaning the drainage
It is strictly forbidden to use sharp metal objects (knitting needles, knives, wire) to pick the hole. You may puncture the thin wall of the drainage channel or damage the evaporator, which is located just behind the plastic. Repairing an evaporator is a complex and expensive process that requires refilling with freon.
To disinfect and dissolve grease plugs, you can use a weak solution of soda or citric acid. Fill a syringe with the solution and inject it into the hole, leaving it for 10-15 minutes, then rinse with clean water. This will help eliminate the unpleasant odor if it has already appeared.
What to do if the water is frozen in the tube?
If you suspect an ice plug, under no circumstances pour boiling water abruptly and abundantly - the plastic may crack due to temperature changes. Use warm water (40-50 degrees) and work gradually. You can also use a hair dryer, but with caution: direct warm air to the hole area for no more than 1-2 minutes, constantly moving the hair dryer so as not to melt the plastic. The best way is long-term natural defrosting for 24 hours.
Table: Comparison of types of drainage systems
Different models of refrigerators may have design features in organizing moisture removal. Understanding the type of your system will help you quickly find the cause of the malfunction.
| Characteristics | Drip system (Direct Cool) | No Frost system | Combined system |
|---|---|---|---|
| Location holes | Inside the refrigerator compartment, on the back wall | Inside the freezer (hidden) | In both compartments |
| Cleaning frequency | Once every 3-6 months | Once every 1-2 years (less often) | As needed |
| Risk of ice formation | High (with frequent opening) | Low (automatic defrost) | Medium |
| Hole visibility | Open, visible immediately | Often hidden behind the panel | Visible in the refrigerator compartment |
In refrigerators No Frost drainage hole in the freezer it is often closed with a decorative plug or located deep inside where access is difficult. Cleaning these models requires more care and sometimes partial disassembly of the back panel.
Prevention of blockages and proper care
In order for the “hole” in the refrigerator to work properly for years, it is enough to follow simple operating rules. Regular cleaning is the key to success. Once a month, wipe the back wall with a damp cloth, removing dust and crumbs that may roll into the gutter.
Monitor the condition of the door seals. If the elastic does not fit tightly, warm, moist air constantly enters the chamber. The volume of condensate increases sharply, and the drainage system may not be able to cope with such a load, even if it is fully operational. You can check the seal using a sheet of paper: hold it with the door and try to pull it out. If the sheet comes out too easily, the seal needs to be changed or adjusted.
It is also important not to overload the refrigerator with food. If the shelves are filled to capacity, air circulation is disrupted, zones with different temperatures are formed, which leads to increased formation of frost and moisture. There should always be a gap of several centimeters between the food and the back wall.
Frequently asked questions and answers (FAQ)
Why does cold air blow from the hole in the refrigerator air?
Normally, air should not circulate through the drainage. If you feel a distinct flow of cold air, the system may be leaking or the duct itself may be clogged, creating a pressure difference. This may also indicate that the drainage tube has moved away from its mounting location inside the housing.
Is it possible to drop oil into the hole to lubricate the tube?
No, this cannot be done. The oil will create a greasy film on which dust and dirt will stick, which will lead to the rapid formation of a dense plug. The drainage system works on the basis of free flow of water; it does not require lubrication.
What to do if after cleaning the water still stands?
If washing and mechanical cleaning did not help, perhaps the blockage is deep in the tube going into the housing, or the hose itself is pinched. In this case, partial disassembly of the rear wall of the refrigerator is required to access the drain pump (if there is one) or the bend of the tube. It is better to contact a specialist.
How to understand that the hole is completely clean?
A simple test: pour a glass of water into the hole. If the water leaves quickly, with a characteristic gurgle, and does not appear at the bottom of the chamber, the drainage is clean. If the water sits in the funnel or leaves very slowly, the cleaning must be repeated.