The discovery of a thick crust of ice on the rear inner wall of the refrigerator compartment often causes confusion among equipment owners. This phenomenon, known as “crying evaporator”, in most cases is normal operation and not a sign of a breakdown. Modern units with a drip moisture removal system are specially designed so that condensate freezes on a cold surface, and then thaws and flows into the drain.
However, the situation changes dramatically if the ice layer becomes too thick, turns into a snow coat or spreads to the food. In such cases cyclical operation is broken and the system needs help. Understanding the physical processes occurring inside the chamber will help you distinguish normal from a critical malfunction.
Next, we will analyze in detail the mechanism of ice formation, identify the causes of excessive freezing and propose an algorithm of actions to eliminate the problem.
The principle of operation of the drip defrosting system
To understand why ice occurs, you need to understand the physics of the process. In refrigerators with No Frost or a drip system (Direct Cool), the back wall is the evaporator. While the compressor is operating, the temperature of this panel drops significantly below zero, which leads to condensation of moisture from the air and its instant freezing.
When the compressor turns off after reaching the set temperature, the ice on the back wall begins to melt. Water flows through the grooves into a special hole in the drainage system, from where it enters a container above the motor and evaporates. This cycle is repeated constantly, maintaining optimal humidity.
Where does the moisture in the chamber come from?
Moisture enters the chamber every time you open the door. Warm air from a room contains a lot of water vapor, which turns into dew when it comes into contact with cold walls. Also, a source of moisture can be unclosed pots of soup or wet vegetables.
A failure in this well-functioning mechanism leads to the fact that the water does not have time to drain and freezes, forming ice. If you notice that drain hole it is clogged or there is water in the pan, this is the first signal to action.
Natural causes of ice formation
Before looking for a breakdown, it is worth excluding trivial causes associated with operation. Often, users themselves create conditions for abundant ice formation without even knowing it. The first and most common cause is tightness failure the door seal.
If the rubber does not fit tightly, warm air constantly enters the chamber. The cooling system tries to compensate for the heat and works almost non-stop. As a result, the back wall becomes overgrown with a “fur coat” much faster than the thawing cycle can go through.
Another factor is the placement of hot or warm products. Even a slightly heated pan of soup releases a huge amount of steam, which instantly condenses on cold surfaces. The frequency of opening the door also affects: the longer it is open, the more moisture gets inside.
- 🧊 Violation of the seal due to contamination or wear.
- 🍲 Placing warm foods or dishes without lids.
- 🚪 Frequent and prolonged opening of the door refrigerator compartment.
- 💨 Clogged ventilation hole that interferes with air circulation.
Technical malfunctions and breakdowns
If operational reasons are excluded, and the ice continues to grow, this is probably a technical malfunction. One of the common problems is the failure of thermostat or the temperature sensor. The device may “stick” in the “on” position, forcing the compressor to work continuously.
In this case, the back wall freezes through, and the defrosting cycle simply does not occur. The ice shell becomes so thick that it can damage the evaporator or impede heat transfer. A refrigerant leak can also lead to problems, although in this case ice often forms locally, at the point where the freon comes out.
Another important element is defrost heater (in models with fully automatic) or defrost timer. If the heater is burnt out, the ice will not melt during a pause in the compressor operation, and with each cycle it will become more and more.
⚠️ Attention: If you hear that the compressor is running without interruption for several hours in a row, and the back wall is covered with a thick layer of frost, immediately unplug the device. Long-term operation in this mode can lead to combustion of the motor-compressor.
Diagnosing complex breakdowns often requires disassembling the rear panel and checking the electrical circuits with a multimeter. Self-repair is only possible if you have the appropriate skills and tools.
Features of freezing in single-chamber models
Owners of old or budget single-chamber refrigerators (where the freezer is located inside the main chamber) are more familiar with freezing problems than others. In such models there is often no automatic defrosting system, and the entire process is controlled by a mechanical thermostat.
Here the rear wall is directly part of the evaporator. Ice on it is a working process, but its excess indicates that you have not defrosted it for a long time. Unlike modern two-chamber models, here the water does not flow anywhere on its own.
Ice accumulation in such units reduces cooling efficiency and increases energy consumption. A thick crust of ice acts as a heat insulator, preventing the cold from spreading throughout the chamber, which is why the compressor is forced to work longer.
The regularity of defrosting depends on air humidity and the frequency of opening the door, but on average for single-chamber models this procedure is recommended to be carried out once every 3-6 months.
Algorithm for properly defrosting a refrigerator
The most effective way to deal with ice is proper defrosting. Many people make the mistake of starting to chip away at the ice with a knife or trying to speed up the process with a hairdryer. This may damage the evaporator or deform the plastic elements.
The correct approach requires time and patience. First you need to completely disconnect the refrigerator from the power supply. Then you should remove all products and shelves to free up space and provide air access to the back wall.
☑️ Action plan for defrosting
Leave the doors open and wait until the ice melts naturally. You can put a towel under the back wall or place a flat tray to collect water. The process can take from 4 to 12 hours depending on the thickness of the ice.
After all the ice has melted, you must thoroughly rinse the chamber with a weak soda solution and wipe all surfaces dry. Only after complete drying (about 1-2 hours after the ice melts) can the refrigerator be turned on.
Prevention and care of the drainage system
In order for the “crying wall” problem to not return, it is important to monitor the condition of the drainage hole. It is located at the bottom of the back wall, often hidden by a plastic box. Over time, crumbs, mold or mucus may accumulate there, blocking the flow of water.
For cleaning, you can use a special soft brush (often included) or a long wire with cotton wool at the end. Carefully insert the tool into the hole and make several rotational movements to break through the blockage.
| Symptom | Probable cause | Action |
|---|---|---|
| Ice only at the bottom of the back wall | Drain hole clogged | Clean the drain with a brush |
| Uniform coat over the entire wall | Thermostat or sensor is faulty | Call a technician for diagnostics |
| Ice on one side or corner | Freon leak or misalignment | Check tightness and level |
| Water on the floor under the refrigerator | Evaporator tray is misaligned | Adjust the tray above compressor |
Also, do not forget to check the cleanliness of the condenser (grid) at the back of the refrigerator. Dust and animal hair impair heat transfer, forcing the unit to work with increased load, which indirectly affects defrosting modes.
⚠️ Attention: Never use sharp objects (knives, screwdrivers, blades) to chip ice. You may puncture the thin evaporator tube through which the refrigerant will escape. Repairing such a system is complex, expensive and often not economically feasible.
Frequently asked questions (FAQ)
Is it possible to speed up defrosting by placing a bowl of boiling water inside?
Yes, this method effective. Place a pan of hot (but not boiling, so as not to damage the plastic) water at the bottom of the chamber and close the door. The steam will speed up the melting of the ice. Change the water as it cools. However, make sure that the steam does not get directly onto the electronic sensors.
Why did ice appear again after 2 days after defrosting?
Most likely, the root cause was not eliminated. Check to see if the door closes tightly, if the drain is clogged, and if the temperature is set to low. If the technical parameters are normal, the temperature sensor may have failed, which prevents the system from going into defrost mode.
Is the presence of mold on the back wall under the ice dangerous?
Yes, mold spores can spread and get on food. After defrosting, be sure to treat the back wall and drainage hole with a vinegar solution or a special antibacterial agent for household appliances.
Does it need to be leveled if the refrigerator is tilted?
Absolutely. If the refrigerator is tilted forward, the door may not close completely on its own, breaking the seal. If it is tilted back, water from the drainage may not flow into the tray, but may spill out onto the floor. Use a building level to adjust the legs.