Detecting a crack on the inner surface of the refrigeration chamber is always a cause for serious concern, and there are good reasons for this. Back wall in modern units it functions as an evaporator or closes the moisture removal system, so a violation of its integrity directly affects the performance of the entire cooling system. Owners often notice defects after defrosting, but sometimes damage appears spontaneously, without visible mechanical influences on the part of the user.
The situation requires immediate attention, since even a microscopic crack can be the beginning of the end for your refrigerator. If moisture gets inside the housing or the seal of the circuit is broken, repairs may require a complete replacement of an expensive unit or the entire unit. In this article, we will analyze in detail the physical and chemical processes that lead to the destruction of plastic, and also determine whether the equipment can be saved in a particular case.
Design features of the rear panel
To understand the nature of the damage, you must first understand the structure of the internal chamber. In refrigerators with a No Frost or Low Frost system, the back wall is often part of a complex air channel through which cooled air circulates. In simpler models operating on the drip principle, this panel covers plate evaporatorhidden inside the case.
The manufacturing material is special food-grade plastic, which must withstand temperature changes from -24 to +50 degrees Celsius. However, despite the declared frost resistance, the material loses its elasticity over time. The critical factor is not so much low temperature as a sharp change in the heat gradient upon contact with hot water or sharp objects.
Heating elements can be located inside the case, which are periodically turned on to defrost the system. If thermoregulation is impaired or the sensor does not work correctly, the plastic is subjected to extreme thermal stress, which leads to the appearance of microcracks that grow over time.
Hidden evaporator design
In some models, behind the plastic panel there is a foamed aluminum sheet into which a refrigerant pipeline is mounted. Damage to such a structure is practically beyond repair at home.
Main causes of cracks
There are several key factors that most often lead to destruction of the inner surface of the chamber. Understanding these causes will help prevent further deterioration.
- ❄️ Mechanical impact: Using knives, forks, or scrapers to chip ice is the most common cause. Plastic becomes brittle at low temperatures, and even a slight force can punch a hole or leave a deep scratch.
- 🌡️ Thermal shock: An attempt to speed up defrosting using a hairdryer, hot water or heating devices leads to uneven expansion of the material, which causes ruptures in the structure.
- 🧪 Chemical corrosion: The contact of aggressive substances contained in some products (acids, alkalis) or cleaning agents on the walls can corrode the surface layer of plastic.
It is also worth mentioning manufacturing defects. In rare cases, the plastic may be initially of poor quality or have internal stresses that appear over time. If your refrigerator is under warranty and you have not violated the operating rules, this is the basis for a free replacement of the unit.
⚠️ Attention: If you notice that a crack is coming from the place where the shelf or drawer is attached, the reason may be a skewed structure or excessive load on the guides. Do not overload the lower drawers with heavy products.
The influence of the defrosting system on the integrity of the plastic
The mode of operation of the defrosting system plays a huge role in the durability of the back wall. In units with drip system moisture flows down the back panel, freezes and thaws cyclically. Constant contact with water and ice creates conditions for the gradual aging of the material.
In systems No Frost the back wall often remains dry, but powerful flows of cold air operate here. If the blower fan is faulty or the air duct is clogged, localized areas of hypothermia may occur. In these places, the plastic freezes deeper and becomes more vulnerable to any external influences.
A malfunction of the defrost sensor or heating element can cause the ice coat to freeze in a layer that is too thick. When the heat is turned on, a massive block of ice can suddenly move away from the wall, dragging the top layer of plastic with it or causing it to deform due to temperature differences.
Diagnostics: is the crack superficial or through?
Before starting repairs, it is necessary to assess the scale of the disaster. The further strategy of action and the economic feasibility of restoration depend on this.
| Type of damage | Signs | Risks | Possibility of repair |
|---|---|---|---|
| Superficial scratch | Visible only visually, no depression is felt to the touch | Minimal, cosmetic defect | Does not require repair, can be painted over |
| Deep crack | Penetrates deep into the plastic, but does not reach metal/foam | Medium, possible accumulation of dirt and bacteria | High, sealing required |
| Through hole | Visible metal, foam or hear gas escaping (hissing) | Critical, freon leak, compressor failure | Complicated, requires calling a specialist |
To check the through breakdown, you can use a soap solution. Apply it to the suspicious area and watch carefully for the appearance of bubbles. If the bubbles inflate, it means that the refrigerant circuit is damaged.
It is also important to check whether there is a crack in the location area evaporator. In some models of refrigerators (especially old Indesit, Atlant, Beko), the evaporator is made in the form of an aluminum plate glued directly to the back wall from the inside. Damage to such a structure is often fatal.
Methods for restoring tightness
If diagnostics showed that the freon circuit is intact, and only the plastic casing is damaged, the situation can be corrected on your own. The main thing is to use the right materials that are safe for food and low temperatures.
- 🔧 Epoxy resin: Two-component formulations that do not contain toxic solvents. Ideal for filling chips and cracks. Before application, the surface must be degreased with alcohol.
- ❄️ Specialized sealants: Silicones or polyurethane compounds labeled “for refrigerators” or “food grade”. They retain elasticity at sub-zero temperatures.
- 🧱 Cold welding: A plasticine-like mass that hardens and becomes a monolith. It holds its shape well, but requires careful preparation of the surface.
The repair process begins with complete defrosting of the unit. The camera must be completely dry. The crack needs to be slightly widened (if it is a draft) or the edges cleaned so that the repair compound will better adhere to the base. Then the material is applied in several layers with intermediate drying.
☑️ Wall repair algorithm
⚠️ Attention: It is strictly forbidden to use conventional adhesives based on acetone or other aggressive solvents. They can burn through the plastic or release toxic fumes that will remain in the chamber and poison the food.
When you need to call a specialist
There are situations when self-repair is not only useless, but also dangerous. If a characteristic whirring or hissing sound is heard during damage, this means depressurization of the circulation system refrigerant.
Modern refrigerators use various types of freons, and special equipment is required to refill them: a vacuum pump, a pressure gauge station, scales and a burner. You cannot simply “fill in” the gas; the system must be evacuated to remove moisture and air.
A technician is also needed if a crack has led to water getting into the insulating foam. Moisture in the insulation will lead to corrosion of the housing and damage to the thermal insulation, which will eventually cause icing of the outer walls and increased energy consumption.
Damage prevention
To extend the life of the back wall of your refrigerator, it is enough to follow simple operating rules. First of all, avoid using metal objects to remove ice. It is better to let the unit defrost naturally.
When cleaning the chamber, use soft sponges and special products. Do not place hot food in the chamber; this puts extra stress on the system and causes condensation to freeze on the walls. Regularly check the condition of the door seals, as their wear leads to frequent starts of the compressor and increased formation of ice.
Compliance with the temperature regime is also important. Do not set the thermostat to maximum unless necessary. Excessive cooling makes the plastic more fragile and increases the risk of its destruction if accidentally touched.
FAQ: Frequently asked questions
Is it possible to operate a refrigerator with a cracked back wall?
If the crack is superficial and does not affect the cooling system (does not hiss, there is no burning smell wiring), then it can be used, but it is advisable to repair the defect to avoid the growth of bacteria. If the damage is through, operation is prohibited.
What is the best way to seal a crack in a refrigerator?
The best option is two-component epoxy resin for food containers or a specialized repair kit for plastic refrigerators (for example, from companies like Holodilnik-Rem or analogues). Regular superglue will not work, as it will become brittle in the cold.
How much does it cost to replace the back wall in the service?
The cost depends on the model. If only the plastic panel is changed, it is relatively inexpensive (labor + cost of plastic). If the built-in evaporator is damaged, the price can be up to 50-70% of the cost of a new refrigerator, since the circuit must be re-welded or an external evaporator installed.
Why did the crack appear on its own?
This may be a consequence of “fatigue” of the plastic due to constant cycles of expansion and contraction, manufacturing defects in the material or hidden mechanical impact (for example, an ice block pressed on the wall for a long time).