The situation when, after complete defrosting and turning on the refrigerator, a snow crust appears again on the internal walls, causes bewilderment among many owners of household appliances. It would seem that you followed the instructions and let the unit sit, but the result is not pleasing to the eye and jeopardizes the safety of the food. This is not just an aesthetic defect, but a signal that there has been a failure in the air circulation or tightness system.
Understanding the physics of the process will help to avoid panic. Frost i snow coat are formed due to moisture condensation, which instantly freezes on the cold surfaces of the evaporator. If this process is repeated immediately after defrosting, it means that the source of moisture has not been eliminated, or the temperature regime has been disrupted by technical faults. In this article we will analyze the main mechanical and operational reasons.
Failure of the door seal
One of the most common reasons why snow forms on the wall after defrosting is loose door seal fit. Warm air from the room contains water vapor, which, when it enters the freezer, settles on the cold walls. Even a microscopic crack, which is difficult to notice visually, allows enough moisture to form for ice to form.
Rubber loses elasticity over time, cracks or deforms. In places of damage sealing tape active heat exchange occurs. You can check the tightness with a simple test: hold a sheet of paper in the door and try to pull it out. If the paper slides freely, it means the clamp is weak.
⚠️ Attention: If the seal is simply contaminated with grease or crumbs, it can be washed with warm water and soap. However, cracks and tears require complete replacement of the part, since gluing rubber will not give a durable result.
It is also important to check the door hinges. If they become loose, the door warps and one of the sides no longer fits tightly to the body. Adjusting the hinges often solves the problem without purchasing new spare parts.
Errors during the defrosting and drying process
Sometimes the answer to the question of why a snow crust forms after defrosting lies in the actions of the user himself. Many people are in a hurry to turn on the device without waiting for the internal chambers to completely dry. Residual moisture on the walls, in the drainage holes and under the shelves turns into ice when the compressor is turned on.
It is not enough to simply wipe the refrigerator with a dry cloth. Water accumulates in hard-to-reach places: behind plastic panels, in niches for vegetables and in system channels No Frost. When the compressor starts, this moisture evaporates and immediately condenses on the coldest elements.
In addition, the “rest” time of the equipment cannot be ignored. After defrosting, the refrigerator needs to be turned off for at least 2-4 hours so that the refrigerant stabilizes and the oil in the compressor flows into the crankcase. A sudden start can lead to improper operation of the defrost system.
☑️ Proper drying of the refrigerator
Malfunctions of the defrost system (for No Frost models)
In refrigerators with the system No Frost snow should not form at all. If this happens, it means the automatic defrost cycle is broken. In such models, a special timer operates, which periodically turns on the heating element (Heating element) to evaporate ice from the evaporator.
If the heating element burns out, the ice does not have time to melt and a snowball grows. The defrost sensor, which tells the control unit about the evaporator temperature, also often fails. A faulty sensor may “think” that there is no ice and not start heating.
The third element of this chain is a fuse. It protects the system from overheating. If it burns out, the circuit breaks and the heating element stops working. Diagnostics of these elements requires a multimeter and electrical skills.
How to check a defrosting heating element?
To check the heating element, you need to “ring” it with a multimeter. The resistance of a working heater is usually from 200 to 400 ohms. If the device shows infinity or zero, the part must be replaced. Remember that before checking, the refrigerator must be completely disconnected from the network!
Problems with the thermostat and sensors
The thermostat (thermostat) is the “brain” that decides when to turn the compressor on and off. If it is faulty, the refrigerator may run continuously, trying to achieve a non-existent cold ideal. As a result, the walls freeze through, and moisture from the air turns into a thick layer of snow.
Modern models with electronic control are responsible for this. thermal sensors. They may give incorrect readings due to contact oxidation or internal damage. The control unit receives a signal “too warm” and forces the compressor to work non-stop.
Often users accidentally reset the settings by setting the “Super Freeze” mode or maximum power. In this mode, the refrigerator does not turn off for a long time, which is guaranteed to lead to fouling of the chambers with frost.
| Symptom | Probable cause | Nature of snow |
|---|---|---|
| Snow only at the back wall | Defective defrost heating element | Dense ice crust |
| Frost around the entire perimeter | The door seal is broken | Loose, fluffy snow |
| Icicles at the bottom | Drain hole clogged | Ice and frozen water |
| Uniform layer of ice | Thermostat is faulty | Hard, smooth ice |
Clogged drainage hole
Water formed during defrosting (natural or forced) must go through the drainage hole into a special container above the compressor, where it evaporates. If this channel is clogged with crumbs, mold or ice, the water has nowhere to go.
It accumulates at the bottom of the chamber, freezes, forming an ice slide. During the next cycle of operation, this ice interferes with the flow of new water, and moisture begins to overflow, freezing on the shelves and walls. This is the classic reason why, after defrosting, snow and ice form on the bottom and walls.
You can clean the drainage yourself. For this, soft wire or a special brush is used. Carefully insert the tool into the hole (usually located on the back wall) and make several rotational movements. Then pour some warm (not boiling water!) water in there to make sure it drains freely.
The influence of humidity and frequency of door opening
Do not forget about operating conditions. If the room humidity is very high, and you often open the refrigerator door, a lot of humid air comes inside. The cooling system may simply not be able to dry such a volume of steam.
It is especially critical to leave the door open for a long time while loading products. At this moment, intense heat exchange occurs. If you notice that the problem worsens in the summer or during the rainy season, it may be the kitchen microclimate.
It is also important not to put hot or warm foods in the chamber. They actively release steam, which instantly condenses on the walls. Allow the food to cool to room temperature before putting it in the refrigerator.
⚠️ Attention: Do not try to knock off the ice with a knife or sharp objects. Damage to the evaporator (tubes hidden in the wall) will lead to freon leakage. Repair in this case will be complex and expensive, often requiring replacement of the entire cabinet.
Rare but possible technical faults
There are also more complex breakdowns that are difficult to diagnose without equipment. For example, a refrigerant leak. If there is little freon in the system, the compressor works longer, trying to gain temperature, which leads to freezing. In this case, the refrigerator may freeze worse, but there will be snow on the walls.
Another reason is a fan malfunction in No Frost models. If it does not drive air through the chamber, the cold stagnates in one place (usually at the evaporator), causing local formation of a snow coat, while in the rest of the chamber the temperature may be higher than normal.
A clog in the capillary tube can also disrupt the refrigerant circulation cycle. In such cases, a call to the technician is required, since the system must be vacuumized and charged with new refrigerant.
Prevention of re-formation frost
To prevent the problem “why snow forms on the wall after defrosting” from returning, follow simple rules of prevention. Clean the seals regularly and check their fit. Make sure that food does not block the ventilation holes inside the compartment.
Do not overload the freezer. For normal air circulation, there must be a gap between the food and the walls. This is especially important for older models where there is no forced circulation system.
If you live in a house with unstable voltage, use a stabilizer. Voltage surges can damage control electronics, including temperature sensors and defrost timers, which indirectly affects ice formation.
⚠️ Note: Specifications and control locations may vary by model and manufacturer. Always check the official instructions for your refrigerator before starting any checks.
Is it possible to use a hair dryer to speed up defrosting?
Using a hair dryer is acceptable, but with great caution. Do not direct hot air directly at plastic parts as they may become deformed. Also, you cannot heat the back wall inside the chamber if the evaporator is hidden behind it - a sudden temperature change can damage the tubes. It is better to use natural defrosting or containers with warm water.
Why does snow appear on only one side?
Local snow formation often indicates that air circulation is disrupted in this area or there is a specific freezing point. Check to see if the product is leaning against the back wall in this area. If there is a cold air supply pipe there, it may be clogged with ice, and the cold flow hits one point.
Is it necessary to completely defrost a No Frost refrigerator?
Formally, the No Frost system does not require regular defrosting. However, once every year or year and a half, it is recommended to carry out preventive defrosting for 24 hours. This is not necessary to remove ice from the evaporator (where it melts on its own), but to drain water from hidden cavities and clear the drainage, which could become clogged with dust and mold.
What to do if the refrigerator does not freeze after defrosting?
If an hour has passed after defrosting and turning on, and there is no cold, you may have turned on the appliance too early, without allowing the oil to drain into the compressor. Turn it off for 3-4 hours. If there is still no cold after this, a freon leak may have occurred or the start relay may have burned out. Diagnostics by a specialist is required.