Many owners of modern household appliances notice on the back inner wall refrigerator compartment is a small hole, often hidden by a plastic cover. In everyday use, we rarely think about its function until we encounter a puddle of water at the bottom of the refrigerator or an unpleasant odor. This is not just a structural element, but an important part of the air circulation and moisture removal system, without which normal operation of the unit is impossible.
Ignoring the condition of this channel can lead to serious consequences, including food spoilage and compressor breakdown. Understanding the operating principle of the system No Frost or “crying” wall will help you respond in a timely manner to changes in the operation of the device. In this article, we will take a detailed look at where moisture goes, why it sometimes remains inside, and how to properly maintain this unit with your own hands.
Modern refrigerators, whether Indesit, Bosch or LG, use the physical process of condensation to maintain humidity. The water that forms on the back wall should flow down unhindered. If you notice that this process is disrupted, the first thing you should do is check the drainage hole, which is often clogged with crumbs or ice.
The principle of operation of the moisture removal system
The main task of the hole located in the lower part of the rear wall of the refrigerator compartment is to remove condensate. As the compressor operates, the rear wall cools, turning moisture from the air into water droplets. When the heater is turned on and off cyclically, the wall thaws and the water flows by gravity into the drainage chute.
Next, the liquid enters a tube that takes it outside the chamber. On most models, the tube ends above a tray located on the rear exterior wall, directly above the compressor. The heat from the running engine helps the water evaporate, so you don't have to drain it manually. This is a closed cycle that provides an optimal microclimate.
However, the system may malfunction. If the hole is clogged, water begins to accumulate at the bottom of the refrigerator, forming puddles under the vegetable drawers. Drainage system requires periodic attention, especially if you store food in open containers or often leave the door ajar. Violation of the tightness of the seal also increases the volume of condensate, which the drainage may not be able to cope with.
⚠️ Attention: If water flows onto the kitchen floor, this may indicate not only a blockage, but also the displacement of the refrigerator. Make sure that the unit is level, otherwise water may overflow the edge of the internal gutter, bypassing the drainage hole.
It is important to understand the difference between models with a drip system and No Frost. In the latter, moisture is often removed through the evaporator system, but there may also be drainage channels to remove water during defrosting. A blockage in any of these units will lead to freezing of the internal parts and the appearance of ice.
Why the drainage hole gets clogged
There may be several reasons why the water stops flowing. The most common one is food waste. Crumbs of bread, particles of vegetables or pieces of packaging are easily carried by the air flow to the rear wall, where they get stuck in a narrow channel.
The second common reason is the formation of an ice plug. This happens if the thermostat does not work correctly and the temperature inside the chamber drops below normal. The water in the drain tube freezes, blocking drainage. Ice can also form due to a loose door or loading of hot products.
The third reason is biological contamination. In the warm and humid environment of the drainage channel, bacteria and mold actively multiply. Over time, the mucus they secrete narrows the lumen of the tube and completely blocks the flow of water. This is often accompanied by the appearance of a specific musty smell.
- 🍞 Food waste: crumbs, bones, food particles.
- ❄️ Ice plug: freezing of water in the channel due to hypothermia.
- 🦠 Biofilm: reproduction of bacteria and mold inside the tube.
How to check whether the water in the channel is frozen?
If a visual inspection shows that the hole is covered with ice, or the water is standing directly at the entrance to the channel and does not leave, most likely an ice plug has formed. Try gently tapping the tube or defrosting the refrigerator completely (10-12 hours with the doors open). If after complete defrosting the problem disappeared, the problem was in the ice.
Instructions for cleaning the drainage with your own hands
Cleaning the drainage hole is a procedure available to every refrigerator owner. First you need to disconnect the unit from the power supply and empty the bottom shelf. Remove the plastic cover if it covers the hole, and remove visible debris with your hands or a dry cloth.
To clean the channel, it is best to use a special soft brush, which often comes with the refrigerator, or a regular brush for washing bottles. An alternative is cotton wool twisted into a bundle or soft wire with a bent end. The main thing is not to damage the inner walls of the tube with sharp objects.
After mechanical cleaning, it is recommended to rinse the channel. To do this, fill a syringe or syringe without a needle with warm water and inject it into the hole under pressure. If water flows freely into the bottom tray (check its presence and cleanliness at the back of the refrigerator), then the blockage has been removed.
☑️ Cleaning the drainage hole
If the water does not drain, the blockage may be deeper. In this case, you can use a rubber bulb: press it tightly to the hole and squeeze sharply, creating a hydraulic shock. This often helps push the plug through. After the procedure, be sure to wipe the walls of the chamber dry.
Disinfection and odor removal
After removing the blockage, it is important to carry out disinfection to prevent the reappearance of mucus and odor. To do this, you can use a weak solution of soda (1 teaspoon per glass of water) or a weak solution of vinegar. It is better not to use chlorine-containing products, as their vapors can be absorbed into the products.
Pour the selected solution into the drainage hole and leave for 10-15 minutes. Then rinse the channel with clean water. If the odor persists, mold may be deep in the system or the outer tray above the compressor may be dirty. You can get to it by moving the refrigerator away from the wall.
Disinfection It is also necessary if foods with a strong odor that have spoiled were stored in the refrigerator. Bacteria could grow not only in the channel, but also in the seals and on the shelves. In this case, it is recommended to wash all internal surfaces with a solution of baking soda.
Table: Symptoms and methods for solving problems
To quickly diagnose the problem, use the table below. It will help determine the nature of the malfunction by external signs and choose the correct method of elimination.
| Symptom | Probable cause | Solution method |
|---|---|---|
| Water at the bottom of the chamber | Clogged drainage garbage | Mechanical cleaning with a brush |
| Ice crust near the hole | Malfunction of the thermostat or sensor | Complete defrosting, call a technician |
| Unpleasant odor | Bacterial proliferation in the channel | Rinsing with a solution of soda or vinegar |
| Water flows along the back wall | Door leakage | Check and replacement seal |
Please note that if after cleaning the problem returns after a short time, the reason may lie deeper. For example, a malfunction of the defrost sensor or the evaporator heating element. In such cases, self-repair may be ineffective.
⚠️ Attention: Never use sharp metal objects (knitting needles, knives) to clean the drainage. You can pierce the tube or damage the inner lining of the chamber, which will lead to the release of refrigerant and expensive repairs.
Prevention of blockages and care
To ensure that the hole inside the refrigerator always remains clean, follow simple rules for storing food. Pack food in containers or bags to keep crumbs and liquids off the shelves. Regularly check expiration dates and immediately dispose of spoiled products.
Once every six months, it is recommended to carry out preventive cleaning of the drainage, even if there are no visible problems. It will only take a couple of minutes, but will save you from unpleasant surprises. Also monitor the temperature: do not set the temperature too low unless necessary.
If you notice that the door does not close tightly, immediately eliminate the cause. Check to see if anything is blocking the seal, or if the refrigerator itself is warped. Correct installation is the key to the effective operation of the entire air circulation system.
When it is necessary to call a specialist
There are situations when independent actions can be useless or dangerous. If, after complete defrosting and thorough cleaning, water continues to accumulate, the problem may be a technical fault. This may be a failure of defrost sensor, heating element or timer.
Also, the help of a specialist is needed if you suspect a freon leak (the refrigerator hums, but does not cool) or if a “coat” of ice has formed inside the chamber that does not melt. In models No Frost the blockage may be in a hard-to-reach place behind the rear panel, which cannot be reached without disassembly.
The technician will carry out diagnostics using special equipment, check the electrical circuits and, if necessary, replace faulty parts. An attempt to disassemble a complex assembly yourself may lead to loss of warranty on the equipment.
What happens if you ignore the drainage blockage?
The constant presence of water at the bottom of the refrigerator leads to corrosion of metal parts, swelling of the shelves and the appearance of mold, the spores of which can get into the food. In addition, water can flow under the plastic floor and damage the thermal insulation layer, which will require complex repairs.
Can chemical cleaning agents be used?
The use of aggressive household chemicals (chlorine, acids) is not recommended. They can damage plastic and rubber seals and leave toxic fumes. Baking soda, a weak solution of vinegar, or special products for cleaning refrigerators are best suited.
How often do you need to defrost a refrigerator?
Refrigerators with a system No Frost do not require defrosting, but preventive cleaning is recommended 1-2 times a year. Models with a drip system (“crying wall”) also do not need frequent defrosting if they are working properly, but cleaning the drainage is critical for them.