Detection of a crack on the inner surface of the freezer is a situation that causes panic in any owner of a household appliance equipment. Rear wall in modern models, especially systems No Frost, performs a critical function: it is a heat exchanger within which the refrigerant circulates. Violation of the tightness of this circuit leads to the instant release of freon to the outside and the cessation of cold production.
The situation is aggravated by the fact that many users, not knowing the intricacies of the device, try to break off the frozen ice with sharp objects, which becomes a fatal mistake. At this moment, a characteristic hissing sound is heard, and after some time the products begin to defrost. Independent sealing of aluminum evaporator tubes at home without special equipment is practically impossible and often leads to complete failure of the unit.
In this article we will analyze in detail why depressurization occurs, what methods exist to restore the functionality of the equipment and the cost whether the sheepskin is made. You will learn how to correctly diagnose the problem, what tools are needed for professional repairs, and whether it is possible to replace the damaged unit yourself, without resorting to the services of expensive service centers.
Why the back wall was rubbed: the main causes and mechanics of destruction
To understand the scale of the disaster, you need to understand the design of the evaporator. Most refrigerators use a so-called “crying” evaporator or tubular heat exchanger frozen into the polyurethane foam base of the back wall. The aluminum from which the tubes are made has excellent thermal conductivity, but extremely low mechanical strength. Indesit, Atlant And Beko a so-called “crying” evaporator or tubular heat exchanger is used, frozen into the polyurethane foam base of the rear wall. The aluminum from which the tubes are made has excellent thermal conductivity, but extremely low mechanical strength.
The main reason for depressurization is the human factor. An attempt to speed up defrosting using a knife, screwdriver or ice pick often ends in puncturing the thin-walled tube. Even a microscopic hole under the pressure of circulating gas quickly turns into a full-fledged crack. The metal becomes thinner due to constant cyclic load: expansion during heating and contraction during cooling.
However, there are also manufacturing defects or corrosion processes. If moisture gets inside the system along with oil during refueling, internal corrosion of the aluminum may begin over time. The wall becomes thinner from the inside and bursts even from a light touch or vibration of the compressor. Also, the cause may be poor-quality assembly, when the evaporator tube was pinched or strained during installation.
It is important to understand that the site of damage is often hidden under a layer of ice or foam. It is not always possible to visually find a fistula, especially if the leak occurred in the area adjacent to the body. That is why diagnostics require not only a visual inspection, but also the use of specialized tools.
Primary diagnostics: how to find the location of a refrigerant leak
Before taking active steps, you need to make sure that the problem lies precisely in a breakdown of the rear wall, and not in a malfunction of the compressor or thermostat. The first sign is the complete absence of cold when the engine is running. The compressor hums continuously without turning off, but the temperature in the chambers remains at room temperature.
To accurately determine the location of the leak, technicians use the pressure testing method. The system is filled with nitrogen under pressure, and the joints or damaged areas begin to “poison” the gas. You can find the fistula using a soap solution: the bubbles will indicate the exact location of the depressurization. At home, this method is difficult to apply due to the lack of a nitrogen cylinder and a reducer.
- 🔍 Visual inspection: carefully examine the back wall for deep scratches, dents or characteristic oily stains around the crack.
- 👂 Acoustic control: listen to the hissing immediately after defrosting, it may be barely audible, but indicating the release of gas.
- 🌡️ Analysis of the compressor operation: if the motor is hot, but does not start or runs without interruption, this is a sure sign of loss of freon.
If you find that evaporator damaged, do not rush to seal the hole with epoxy resin or cold glue. These materials cannot withstand internal pressure and temperature changes, as well as chemical interaction with oil and freon. Temporary sealing is only possible for transporting the refrigerator, but not for its operation.
Choosing a repair strategy: sealing, replacement or a new evaporator
The owner is faced with the question: repair the old unit or replace the unit? There are only three options for solving the problem: trying to solder aluminum tubes, installing an external evaporator (“crying”), or completely replacing the rear panel. The choice depends on the model of the refrigerator, the location of the damage and the budget.
Soldering aluminum is a complex process that requires flux, special solder and experience. Aluminum instantly oxidizes in air, forming a strong film that interferes with the connection. Even if you manage to solder the hole, there is a high risk that a new crack will appear nearby due to the heating of the metal by the torch. This method is considered temporary and unreliable.
The most competent solution for refrigerators No Frost is to replace the evaporator. In some models, you can dismantle the plastic panel, cut out the old heat exchanger and install a new one of a similar shape. However, it is often easier and more reliable to retrofit the system by installing a mounted evaporator inside the chamber, although this will reduce the useful volume.
It is also worth considering the economic feasibility. If the refrigerator is more than 10-12 years old, the cost of spare parts and refilling work can be up to 70% of the price of a new device. In such cases, repairs make no sense, and it is wiser to consider purchasing new equipment with a modern energy efficiency class.
Evaporator replacement technology: step-by-step instructions for advanced ones
If you decide to change the evaporator yourself, you will need a serious set of tools: a vacuum pump, a pressure gauge station, scales for dosing freon, a burner and a set of tubes. The process begins with complete defrosting of the unit for at least 24 hours.
The next step is dismantling the old panel. In models with the system No Frost the rear wall is often part of a plastic box. Carefully remove the fasteners, disconnect the sensors and remove the panel. The old evaporator is cut out or unsoldered from the copper lines.
☑️ Checklist for preparing to replace the evaporator
Installation of a new unit requires precision. The tubes must be bent without creases using a pipe bender. Copper-aluminum connections are made through adapters or using silver solder. After installation, the system must be evacuated for 30-40 minutes to remove moisture and air.
⚠️ Attention: Never turn on the compressor if the system is not charged with refrigerant or is under vacuum. This will lead to the motor winding burning out in a few seconds.
The final stage is refueling. The amount of freon (R134a or R600a) must strictly correspond to the label on the compressor. Overfilling or underfilling will lead to incorrect operation of the refrigerator and possible failure of the compressor.
Necessary tools and materials to restore the tightness
The quality of the repair directly depends on the materials used. To work with the refrigeration circuit, you cannot use ordinary plumbing solders. A special high-temperature solder containing silver is required, which provides a strong and elastic connection that is resistant to vibration.
For refilling you will need a freon cylinder. It is important to know what type of refrigerant was used in your model: R134a (tetrafluoroethane) or R600a (isobutane). Isobutane is explosive, so working with it requires special care and good ventilation. Errors in choosing a refrigerant are unacceptable.
| Material / Tool | Purpose | Importance |
|---|---|---|
| Solder with silver (30%+) | Soldering copper-aluminum joints | Critical |
| Technical nitrogen | Crimping and purging of the system | High |
| Vacuum pump | Removing moisture and air | Required |
| Flux for aluminum | Removal of oxide film during soldering | High |
Also do not forget about insulating materials. Soldering points and pipes must be carefully insulated to avoid condensation and freezing. Use high-quality heat shrink or polyethylene foam that is resistant to low temperatures.
Can automotive sealants be used?
Automotive air conditioning sealants can theoretically temporarily stop the leak, but they often clog the capillary tube and filter drier, resulting in costly repairs to the entire refrigerator hydraulics.
Prevention of repeated damage and care of the freezer
After successful repair or replacement of the evaporator, it is important to change the approach to operating the refrigerator. The main recommendation is to never use sharp objects to remove ice. If your fur coat is frozen, let the refrigerator defrost naturally, leaving the doors open overnight.
Regularly check the condition of the door seals. If the tires are worn out, warm, moist air enters the chamber, which leads to increased ice formation. An excessive layer of ice increases the load on the walls and evaporator, increasing the risk of damage to them when trying to clean.
- 🧊 Defrost the chamber at least once a year, even if you have a system No Frost.
- 🚫 Do not put hot foods in the freezer - this causes a sharp rise in temperature and condensation.
- 🧹 Wipe the back wall with a soft cloth, without making any effort, so as not to push through the thin plastic.
Following these simple rules will extend the life of your refrigerator for many years. Remember that the thin aluminum wall is the “Achilles heel” of modern technology and requires careful handling.
Frequently asked questions (FAQ)
Is it possible to seal a crack on the back wall with regular glue?
No, regular adhesives (superglue, epoxy) are not designed to work in refrigerant and oil environments at low temperatures. They will quickly lose their elasticity, crack, and the gas will come out again. Cold welding for aluminum or soldering is required.
How much does it cost to replace the evaporator at a service center?
The price consists of the cost of the spare part (from 2000 to 5000 rubles) and the work of the technician (from 3000 rubles). The total amount often varies from 5,000 to 9,000 rubles depending on the model and region.
Why does the refrigerator freeze poorly after repair?
Possible reasons: underfilling or overfilling of freon, presence of air in the system (bad vacuum), clogged filter-drier or leaky new connections. Repeated diagnostics with a pressure gauge is required.
Is it dangerous to breathe freon vapors during a leak?
Modern freons (R134a, R600a) in small quantities contained in a household refrigerator are not toxic to humans. However, R600a is explosive in high concentrations, so the room must be ventilated.