Owners of modern household appliances often encounter a situation where an excess layer of ice appears on the inner surface of the chamber. If the back wall of your refrigerator freezes, this indicates a violation of the system operation algorithms Atlant the back wall freezes, this indicates a violation of the system’s operating algorithms No Frost or Low Frost. Unlike older models with manual defrosting, here the ice should leave automatically, but sometimes the mechanism fails.
The appearance of a “fur coat” on the evaporator or back panel is not just an aesthetic defect. This is a direct threat to the compressor, which begins to work in increased mode, trying to compensate for the loss of cooling capacity. Ignoring the problem can lead to expensive repairs or complete replacement of the unit.
In this article we will analyze in detail the physical and technical causes of freezing, consider typical malfunctions and propose methods for eliminating them. You will find out when it is enough to simply defrost the chamber, and in which cases replacement Defrosting heating elements or sensors will be required.
The principle of operation of the defrosting system in Atlant refrigerators
To understand why the problem occurs, you need to understand the structure of the unit. Refrigerators Atlant with the system No Frost are equipped with a special evaporator hidden behind the rear plastic panel. During operation of the chamber, air circulates through this heat exchanger, cooling and spreading throughout the volume. Moisture from the products settles on the cold fins of the evaporator in the form of frost.
Periodically, according to the set timer or sensor readings, the defrost mode is turned on. At this moment, the compressor and fan stop, and the heating element (Heating element) begins to melt the ice. The melt water flows into the drainage tray and evaporates. If this cycle is disrupted, the ice does not have time to melt and begins to accumulate, eventually turning into a monolithic block.
In models with a system Low Frost (often found in two-chamber Atlant models) the rear wall of the refrigeration chamber is made of a special material and is part of the evaporator. Here, freezing is acceptable in the form of a thin layer of frost while the compressor is running, but when stopped, it should completely disappear. If the wall is constantly covered with a thick layer of ice, it means that the heat exchange or the tightness of the circuit is broken.
What is the difference between No Frost and Low Frost?
In the No Frost system, the products do not come into contact with the cold walls, cooling is carried out by air flow. In Low Frost, the rear wall of the refrigerator compartment is cooled directly, which allows the moisture of the products to be better preserved, but requires perfect tightness of the seals.
Main technical causes of freezing
There are several key components, the failure of which leads to the formation of an ice crust. Most often, the problem lies in the elements of the automatic defrost system. Let's take a closer look at them so that you can carry out an initial diagnosis.
The first candidate for testing is Defrost heating element. This is a nichrome spiral that heats up when voltage is applied. Over time, the spiral may burn out, ceasing to perform its function. You can check the integrity with a multimeter: if the device shows an open circuit, the heating element must be replaced.
⚠️ Attention: Before taking any measurements with a multimeter, be sure to disconnect the refrigerator from the power supply! Working with live electrical appliances is life-threatening.
The second important element is defrost sensor (defrost). It controls the temperature of the evaporator. If the sensor is “stuck” in the “cold” position, it does not command the control module to turn on the heating element. As a result, the compressor continues to freeze, but the ice does not melt. Also often the electronic control module fails, which simply does not start the defrost cycle. defrost timer or an electronic control module that simply does not initiate the defrost cycle.
The third common reason is clogging. drainage hole. Even if the ice melts successfully, the water needs somewhere to go. If the channel is clogged with crumbs, mold or frozen dirt, the water remains inside the chamber and freezes below or on the back wall, forming ice.
Fault diagnosis: step-by-step algorithm
Before calling a technician or buying spare parts, you need to localize the problem. Do not rush to disassemble the unit completely; start with a visual inspection and simple tests. This will help save time and money.
First of all, pay attention to the nature of freezing. If the ice covers the entire back wall evenly and looks like a thick crust, the problem is most likely in the defrost cycle. If the ice build-up is local (for example, only in a corner or near the door), this may indicate a loose seal or the entry of warm air.
For accurate diagnosis you will need a multimeter. The verification process is as follows:
- ❄️ Defrost the refrigerator completely (at least 24 hours) to remove all ice.
- 🔧 Remove the back panel in the freezer to gain access to the evaporator and heating element.
- 🔌 Ring the heating element defrosting: the resistance of a working element is usually from 200 to 600 Ohms.
- 🌡️ Check the temperature sensor: its resistance should change depending on the ambient temperature.
If the heating element and sensor are working, the problem may lie in the control module. However, electronic diagnostics require special knowledge. In this case, it is better to turn to professionals, since independent re-soldering of the board can lead to the final failure of the equipment.
Solving the problem: repair instructions
If the diagnostics revealed a specific faulty part, it must be replaced. Repair of the defrost system in refrigerators Atlant is a procedure accessible to a person with basic skills in handling tools. The main thing is to follow the sequence of actions.
First, make sure that you have selected the right spare parts. Original heating elements and sensors for Atlant may differ in power and length from analogues. Using unsuitable components can lead to repeated breakdowns or even a fire hazard.
The process of replacing a heating element includes dismantling the old part and installing a new one. It is important to handle wires and connections carefully. After installing all the elements, assemble the refrigerator, but do not plug it in yet. Allow the system to cool to room temperature if you carried out work immediately after defrosting.
☑️ Checklist before turning on the refrigerator
After assembly, turn on the unit and check its operation for several cycles. Pay attention to whether the fan starts, the compressor runs, and whether ice reappears. If the problem does not return within 2-3 days, the repair can be considered successful.
Table of faults and elimination methods
For ease of data systematization, we have prepared a summary table. It will help you quickly compare symptoms with possible causes and solutions.
| Symptom | Probable cause | Elimination method |
|---|---|---|
| Thick layer of ice on the evaporator | The defrost heating element is faulty | Replacing the heating element |
| The ice does not melt, the compressor hums constantly | The temperature sensor is stuck | Replacing the sensor (defrost) |
| Water is at the bottom of the chamber | Clogged drainage channel | Cleaning the tube with a brush or water |
| The defrost cycle does not start | Faulty timer or module | Repair or replacement of the control board |
Using this table allows you to weed out obvious options. For example, if the water does not drain, there is no point in checking the heating element - you need to clean the drainage. If the ice freezes, but the water drains normally when defrosting, then the problem is in the heating.
Prevention and proper care of equipment
So that the question “why the back wall freezes in the refrigerator Atlant no longer bothers you, it is important to follow the operating rules. Preventive measures significantly extend the life of the system No Frost and reduce the risk of breakdowns.
Regularly check the condition of the rubber seals on the doors. If the rubber is dry, cracked or does not fit tightly, warm, moist air enters the chamber. This causes the system to wear out, causing increased ice freezing. Wipe the seals with a soft cloth and soapy water once a month.
Also monitor the temperature regime. Do not set the regulator to the maximum value unless necessary. Operating at maximum capacity leads to deep freezing of the channels and complicates the operation of the automatic defrosting system. The optimal temperature in the main chamber is +4°C, in the freezer - -18°C.
⚠️ Attention: Never use sharp objects (knives, screwdrivers) to chip ice! Damage to the evaporator tubes will lead to freon leakage and complex, expensive repairs.
Once a year, it is recommended to completely defrost the refrigerator, even if you have a system No Frost. This will help clean hard-to-reach places from accumulated dust and bacteria, as well as check the operation of the drainage system. Turn off the appliance, remove all food and leave the doors open for a day.
Frequently asked questions and answers (FAQ)
Is it possible to operate the refrigerator if there is ice on the back wall?
Short-term operation is possible, but not advisable. The constant presence of ice increases the load on the compressor, which leads to excessive energy consumption and a reduction in the service life of the motor. In addition, ice reduces the useful volume of the chamber.
How long does it take to defrost the Atlant refrigerator?
It takes at least 24 hours for the ice to completely thaw and moisture to evaporate from the thermal insulation. If you defrost the unit for less than 10-12 hours, the moisture in the pores of the insulation may not have time to dry out, which will lead to rapid re-formation of ice.
Why did ice appear again after a couple of days after defrosting?
This is a sure sign of a malfunction of one of the elements of the defrosting system (heating element, sensor, timer). If the problem was infrequent use or open doors, the ice would build up gradually. The rapid formation of a “coat” indicates a technical failure.
Is it necessary to change freon if the wall freezes?
In 95% of cases, freezing of the rear wall is not related to the amount of refrigerant. The problem lies in the electrical part (defrost). Refilling with freon is required only in case of mechanical damage to the circuit or a manufacturing defect, which rarely happens.
Can a hair dryer be used to speed up defrosting?
You can use a hair dryer with great care, directing a flow of warm (not hot!) air. However, it is better to let the ice melt naturally. A sudden temperature change can damage the plastic of the inner chamber or cause cracks in the evaporator.