Detection of deformation of the internal surfaces of the refrigeration chamber always causes concern for the owner of household appliances. Bloating of the back wall is not just a cosmetic defect, but a symptom indicating a violation of the temperature regime or problems with the structural elements of the unit. Owners often ignore the first signs until the plastic panel bursts or begins to interfere with the closing of the door.
Modern models, especially those equipped with the system No Frost, have a complex internal structure, where an evaporator, a heating element and an air duct system are hidden behind decorative plastic. Any change in pressure, accumulation of moisture or overheating leads to physical expansion of materials. Understanding the nature of this process is necessary to make a decision: call a specialist or try to correct the situation yourself.
Physics of the process: why plastic changes shape
The main reason for deformation is the difference in temperatures and properties of materials. The plastic from which the inner box is made has a certain coefficient of thermal expansion. With sudden cooling or, conversely, with local overheating, the material begins to shrink or stretch unevenly. If the inner panel is too tightly adjacent to the thermal insulation or metal body, it has nowhere to go except to bend inside the chamber.
Often, swelling is caused by the accumulation of ice behind the wall. In systems with automatic defrosting, water should flow into the drain, but if the hole is clogged, the liquid freezes. Ice plug occupies more volume than water and puts pressure on the plastic partition. Over time, the pressure becomes critical, and the wall loses its original geometry.
It is also worth considering the quality of the plastic itself. Cheap models may use polymers with low resistance to cyclic loads. Constant freezing and thawing makes the material brittle or, conversely, too soft, which leads to its deformation even during normal operation of the compressor.
⚠️ Attention: If you notice that the wall is swollen very strongly and a cracking sound is heard, immediately unplug the refrigerator. Continuing operation may lead to rupture of the evaporator tubes and leakage of freon.
Problems of the No Frost system and air circulation
In refrigerators with technology No Frost the rear wall is part of a complex cold air circulation system. Behind it there is an evaporator and a fan. If the fan is not working correctly or the air ducts are clogged, cold air begins to accumulate in one place. This creates local zones of hypothermia, where the plastic is compressed more than in neighboring areas.
Another common reason is a malfunction of the defrost heating element. If the heating element burns out or works intermittently, a “coat” of frost grows on the evaporator. This ice gradually turns into a monolithic mass that physically pushes the back panel apart. Unlike a drip system, here the ice does not drain, but evaporates, so any failures in the defrosting cycle are critical.
Failure of the door seals also plays a role. The intake of warm, humid air from the room leads to increased formation of condensation inside the chamber. This condensate settles on the back wall and, penetrating behind it through microcracks, freezes, creating additional pressure.
Mechanical damage and operating errors
The reason does not always lie in a technical malfunction. Often users themselves become the culprits of deformation. For example, placing food that is too hot into the chamber causes a sudden jump in temperature and humidity. Plastic does not have time to adapt to changes, which leads to its warping. This is especially true for large pans that occupy a significant part of the volume.
Mechanical impact is the second common factor. When loading bulky products (watermelons, large packages of meat), users may accidentally press on the back wall. Even if there are no visible cracks, the internal structure of the plastic is damaged, and over time it “floats” under the influence of cold. Microcracksthat arise upon impact become stress points from where deformation begins.
The use of sharp objects to chip ice is strictly prohibited, but many still resort to to this method. Piercing the wall with a knife or screwdriver violates the tightness and integrity of the structure. At the puncture site, the plastic begins to deteriorate faster, and swelling may appear precisely around the damaged area.
⚠️ Attention: Never use a hair dryer or other heating devices to “straighten” dents. Local overheating can melt the plastic or damage the refrigerant located in the tubes behind the wall.
Diagnostics of faults: table of symptoms
To correctly determine the cause of swelling, it is necessary to analyze the accompanying symptoms. A simple visual inspection is often not enough, as the problem may lie deeper. Below is a table that helps compare visible signs with the probable cause.
| Symptom | Probable cause | Difficulty of repair |
|---|---|---|
| Bloating in the lower part of the wall | Clogged drain holes, water accumulation | Low (cleaning) |
| Swelling over the entire area | Faulty defrost heating element, ice coat | Medium (part replacement) |
| Local swelling with crack | Mechanical damage, impact | High (panel replacement) |
| Bloating and hum of the fan | Ice on the fan blades, poor circulation | Medium (defrosting/repair) |
By analyzing the data from the table, you can preliminary assess the scale of the disaster. If the symptom indicates a blockage, you can solve the problem yourself in 15 minutes. If we are talking about a defrosting system, you will need a multimeter and, possibly, new spare parts.
How to check a defrosting heating element without disassembling?
It is impossible to completely check the heating element without disassembling, but you can indirectly evaluate its operation. To do this, you need to defrost the refrigerator manually (leave it turned off for 24 hours). If, after turning on, the problem with bloating and ice does not return within a week, most likely the heating element or thermostat is faulty and does not defrost the evaporator automatically.
Instructions for eliminating bloating with your own hands
If you decide to eliminate the deformation yourself, you must act consistently. First you need to completely defrost the unit. This is a mandatory step, since working with frozen parts can lead to their breakage. Unplug the refrigerator, remove all food and leave the doors open for at least 24 hours.
After defrosting, remove the back panel. It is usually secured with latches or screws hidden under decorative plugs. Be careful: cold plastic is very fragile. If the panel is simply bent by ice, after defrosting it may return to its original position on its own. If the deformation remains, you can try to gently warm the area of the swelling with a hairdryer (at minimum temperature) and press it with a weight until it cools down.
Be sure to check the drainage hole. It is located at the bottom of the back wall. Clean it with a special brush or soft wire, then rinse with warm water. Make sure that water flows freely into the tray above the compressor.
☑️ Algorithm for action in case of wall swelling
If after assembling and turning on the refrigerator, bloating appears again after a few days, This means the cause has not been eliminated. Most likely the defrost heater or temperature sensor needs to be replaced. In this case, you cannot do without calling a specialist and using diagnostic tools.
Prevention and proper care of the refrigerator
To avoid repeated swelling of the back wall, it is important to follow the operating rules. Do not place hot food in the chamber. Allow food to cool to room temperature before storing. This will reduce the load on the cooling system and prevent the formation of excess condensation.
Regularly check the condition of the door seals. If they do not fit tightly, warm air enters the chamber, which leads to freezing. Wipe the seals with a soft cloth and, if necessary, treat them with silicone grease to maintain elasticity. Tightness of the chamber is the key to stable operation of the entire system.
Once every six months it is recommended to carry out preventive defrosting, even if you have a system No Frost. This will help remove micro-ice that has not yet melted and clear the drainage before it becomes completely clogged. Also make sure that the products do not fit tightly against the back wall, leave a gap for air circulation.
⚠️ Attention: The design and arrangement of elements may differ for different models (Indesit, Bosch, LG, Samsung). Before removing the panels, check the technical documentation or diagrams for your specific modification so as not to damage the fastenings.
Frequently asked questions (FAQ)
Is it possible to use the refrigerator if the wall is swollen?
If the swelling is small and does not interfere with the closing of the door, and there are no extraneous sounds or water on the floor, short-term use is possible. However, this is a temporary measure. The deformation will progress, which may lead to rupture of the evaporator tubes or failure of the fan. It is recommended to eliminate the cause.
How much does it cost to replace the rear plastic panel?
The cost consists of the price of the part itself and the work of the technician. Plastic is relatively inexpensive, but shipping and replacement can take time. In some cases, it is easier and cheaper to try to straighten the existing panel if it is not cracked.
Why did the wall swell after defrosting?
If you defrosted the refrigerator using a hairdryer or boiling water, a sharp temperature change could deform the plastic. It is also possible that ice remained behind the wall, which, when melted, expanded in a confined space, or water got into the thermal insulation layer, causing delamination of materials.
Does the quality of the power supply affect the swelling of the wall?
Indirectly - yes. Voltage surges can damage the defrost heating element or control board. If the heater stops turning on on time, ice will begin to grow on the evaporator, which will eventually lead to swelling of the back panel.