Detection of deformation of internal surfaces refrigeration chamber is always an alarming signal for the owner of household appliances. Most often, users are faced with the fact that the back wall is swollen inside the refrigerator, losing its original flat shape. This phenomenon not only spoils the aesthetic appearance of the unit, but may also indicate serious problems in the operation of the cooling system or thermal insulation.
Many people mistakenly believe that if the freezer continues to work, then the problem does not require immediate intervention. However, ignoring the initial signs of plastic or metal swelling can lead to more complex and costly repairs in the future. Understanding the physics of the process and knowledge of the device modern refrigerators will help you correctly assess the scale of the disaster.
In this article we will analyze in detail why the back wall is deformed, which models are susceptible to this ailment more often than others and whether it is possible to correct the situation yourself. It is important not to panic, but to consistently analyze the state of the equipment in order to make the right decision on further actions.
Physics of the process: why plastic or metal changes shape
To understand why the rear wall is swollen inside the refrigerator, it is necessary to consider the design of the evaporator. In modern models with the No Frost system and even in drip units, the cooling element (evaporator) is often hidden behind the inner panel of the chamber. Between this panel and the body of the refrigerator there is a layer thermal insulation and space for air circulation.
During normal operation, the temperature inside the chamber is maintained within specified limits. However, if there is a malfunction in the defrost system or the compressor works hard without stopping, the evaporator temperature may fall below critical values. The ice formed on the hidden evaporator begins to expand in volume. Since water requires more space when freezing, it creates powerful mechanical pressure on the inner wall.
⚠️ Attention: If you notice that the back wall of the refrigerator is swollen, this often indicates that an ice plug has already formed between the evaporator and the plastic. An attempt to chip ice through a deformed wall can lead to its rupture.
Ice pressure is not the only reason. The materials from which the internal panels are made (most often ABS plastic or thin sheet metal) are subject to thermal expansion. Cyclic heating and cooling, especially if it occurs abruptly or in violation of technology, leads to loss of elasticity of the material and its warping. In some cases the deformation of the plastic is irreversible and requires replacement of the panel.
The main reasons for the deformation of the back wall
There are several key factors leading to the fact that the back wall is swollen inside the refrigerator. Knowing these reasons will help you determine whether it is a manufacturing defect, the result of improper operation, or a technical malfunction.
The first and most common cause is malfunction of the defrost system. If the defrost heating element, thermostat or timer fails, the ice on the evaporator stops melting at the proper time. It accumulates layer by layer until it begins to squeeze the plastic panel out. This is a classic problem for models Indesit, Atlant and Beko with the No Frost system.
The second reason may be a violation of the tightness of the circuit. If warm, moist air enters the refrigerator compartment due to a loose door or damaged seal, the moisture will settle in the coldest areas. The rear wall, behind which the evaporator is located, is just such an area. Intense ice formation in this place leads to local swelling.
- ❄️ Failure of the sensors: Incorrect temperature readings lead to excessive cooling.
- 🚪 Damage seal: The constant influx of moisture from the outside accelerates the fouling of ice.
- 🧊 Loading warm products: A sharp increase in humidity inside the chamber provokes freezing.
It is also worth mentioning manufacturing defects or design features. In some budget models, the thickness of the rear panel plastic may not be sufficient to compensate for the internal pressure when the materials expand. In such cases, the wall may swell even during normal operation of the unit, if, for example, a low-quality polymer was used.
Features of models with the No Frost and drip system
The nature of swelling of the rear wall may vary depending on the type of defrosting system. In refrigerators No Frost the evaporator is completely hidden, and the user does not see the ice until the deformation becomes noticeable. Here, bloating is often accompanied by deterioration of air circulation and the appearance of extraneous noise from the fan, which can touch ice.
In drip systems (crying evaporator), the back wall is periodically covered with frost, which then melts. If the rear wall is swollen in such a refrigerator, this often indicates that the channels for draining melt water are clogged, or the drainage hole is frozen. The water does not have time to drain, freezes and bursts the panel. Models Liebherr and Bosch less often suffer from this problem due to the improved drainage design.
Two-compressor models deserve special attention. In them, swelling can be observed only in one of the chambers. If deformation occurs in the freezer, the cause almost always lies in the automatic defrosting system. If the refrigerator compartment is damaged, it is worth checking the thermostat and the tightness of the door.
The effect of refrigerant on pressure
Using the wrong type of refrigerant or violating the proportions of the mixture when filling can indirectly affect the temperature regime of the evaporator, which in the long run contributes to the formation of excess ice.
It is important to understand that in No Frost systems the air circulates forcibly. If the wall is swollen and blocks part of the air ducts, the cooling efficiency drops and the compressor begins to wear out. This creates a vicious circle that aggravates the situation.
Diagnostics: how to determine the exact cause
Before starting repairs, it is necessary to carry out proper diagnostics. If the back wall is swollen is inside the refrigerator, a visual inspection is often not enough. You will need to defrost the unit completely to assess the condition of the hidden elements.
The diagnostic process begins with completely disconnecting the refrigerator from the network. It is necessary to pause for at least 24 hours (preferably 48 hours), leaving the doors open. This will allow any ice that may have accumulated behind the panel to completely melt. After defrosting, check whether the wall is level. If the plastic returned to its original state, the problem was most likely the ice. If the deformation remains, the material has lost its shape irrevocably.
Next, you should check the operation of the defrost system. This will require some basic tools and possibly a multimeter. The defrost heating element, defrost sensor and fuse must be checked. In models with electronic control, it is worth reading error codes that may indicate a faulty unit.
| Symptom | Probable cause | Necessary actions |
|---|---|---|
| The wall is swollen, there is ice | Malfunction of the defrost system | Checking the heating element and timer |
| The wall is swollen, there is no ice | Deformation of the plastic | Replacing the internal panel |
| Fan noise | Ice on the blades | Defrosting and cleaning |
| Water on the floor | Clogged drain | Cleaning the drain holes |
If, after defrosting and turning on again, the refrigerator again shows signs of swelling after a few days, it means that the root of the problem has not been eliminated. In this case, you cannot do without replacing faulty parts of the defrosting system.
☑️ Refrigerator diagnostics
Methods for eliminating bloating with your own hands
If the back wall is swollen is inside the refrigerator, there are several ways to solve the problem. The choice of method depends on the degree of deformation and the owner’s readiness for technical intervention. The simplest, but temporary method is mechanical leveling.
To do this, you can use a suction cup (as for glass or tiles) or gently press on the bulge with your hand while the plastic is warm (after the refrigerator is running). However, this method rarely gives a long-term effect, since the stress in the material does not go away. A more radical method is to dismantle the panel. By removing the back wall, you will gain access to the evaporator. This will allow you to thoroughly clean it from ice, check its integrity and, if necessary, replace it.
In some cases, installing an additional layer of thermal insulation between the evaporator and the plastic panel helps. This reduces the likelihood of plastic freezing to the cooling element and reduces thermal stress. Use food-safe materials that are resistant to low temperatures.
⚠️ Attention: When dismantling the inner panel, be extremely careful. Plastic becomes brittle in the cold and can burst if handled carelessly. Let the camera warm up to room temperature before removing the parts.
If the deformation is severe and the panel does not fit into place, you can try straightening it with a hair dryer. Heating the plastic panel will return it to its original geometry. After this, the panel is fixed in a flat position until it cools completely. This method requires skills so as not to completely melt the plastic.
Prevention and recommendations for operation
In order not to encounter a situation in the future when the rear wall is swollen inside the refrigerator, it is important to follow the operating rules. Regular defrosting (even for No Frost systems once every year or two) helps maintain the cleanliness of the evaporator and the efficiency of heat exchange.
Monitor the condition of the door seals. Wipe them with a soft cloth and check the tightness of the fit. If the door does not close tightly, the constant flow of moist air will inevitably lead to the formation of ice jams. Also, do not place hot or warm foods in the chamber - this puts excess stress on the cooling system.
- 🧼 Regular washing: Clean the drainage hole with a weak solution of soda.
- 🌡️ Control temperature: Do not set the values too low unless necessary.
- 🔌 Stable power: Voltage surges can damage the defrost control electronics.
Timely contacting service at the first signs of a malfunction (extraneous sounds, ice in unusual places) will save you money and nerves. Repairing the defrost system at an early stage will cost less than replacing the compressor or the internal lining of the chamber.
When you need to call a specialist
Despite the possibility of self-repair, there are situations when it is better to contact a professional. If the rear wall is swollen you do not have the skills to work with electrical circuits or refrigerants, the risk of damaging your equipment is high. The technician will be able to accurately diagnose the malfunction with a multimeter and replace the burnt heating element or timer.
Also, the help of a specialist is needed if the deformation of the wall has led to damage to the cooling circuit (a smell of gas has appeared or the cooling has stopped). In this case, professional sealing and refilling of the refrigerator with freon is required. Independent repair attempts in such a situation can be dangerous.
A qualified technician will also be able to carefully replace the deformed panel with a new one, selecting the appropriate material and ensuring the tightness of the connections. This will return not only functionality to the refrigerator, but also a neat appearance.
Is it possible to operate the refrigerator if the wall is swollen?
Short-term operation is possible if the refrigerator continues to freeze and there is no refrigerant leak. However, this will lead to increased energy consumption and wear on the compressor. It is recommended to eliminate the cause of the swelling.
How much does it cost to replace the back wall of the refrigerator?
The cost consists of the price of the panel itself (which can be significant and depend on the model) and the work of the technician. It is often cheaper and more effective to try to straighten the existing panel or eliminate the cause of the ice than to buy a new part.
Why is the wall swollen in a new refrigerator?
This may be a manufacturing defect (thin plastic, violation of assembly technology) or a consequence of improper transportation (shocks, temperature changes). In this case, proceed under the guarantee.
Is wall swelling dangerous to health?
Plastic swelling itself is not dangerous. However, if it is caused by mold in hard-to-reach areas due to stagnant water, it may affect the quality of the stored food. The hygiene of the refrigerator compartment must be ideal.