The discovery of an ice crust on the back wall of the refrigerator compartment often becomes an unpleasant surprise for the owner of the equipment. In modern models equipped with a No Frost system, this phenomenon should not occur, since moisture is forced to evaporate there. However, owners of old units with a drip defrosting system often encounter ice buildup, which over time turns into massive ice.
Such a situation not only spoils the appearance of the interior, but also poses a threat to the safety of food. Ice occupies useful volume, disrupts the temperature regime and forces the compressor to work in increased mode. Increased load on the engine inevitably leads to a reduction in the service life of expensive equipment.
Before sounding the alarm and calling a technician, it is worth carrying out the initial diagnostics yourself. In many cases, the reason lies in banal violations of operating rules or a loose fit of the door. Drip system requires careful attention, since it operates by periodically defrosting the evaporator, and any failure in this cycle leads to icing.
Principle of operation of the drip system cooling systems
To understand the nature of the formation of ice, it is necessary to understand the physics of the processes occurring inside the chamber. In classic models, the evaporator is located directly behind the rear panel of the refrigerator compartment. During operation of the compressor, freon circulates through the tubes, cooling them to subzero temperatures. Humid air, in contact with a cold surface, condenses and turns into drops of water.
Water flows down along the ribbed surface into a special groove, from where it is discharged through a drainage hole into a container above the compressor, where it safely evaporates. This cycle repeats itself constantly. However, if the moisture does not have time to drain or the air circulates incorrectly, it freezes. Frost on the back wall This is a signal that the natural process of moisture removal is disrupted.
It is important to note that a small layer of frost during compressor operation is absolutely normal. A problem is considered to be the situation when the ice does not have time to melt during a pause in the engine. If you notice that the back wall has turned into a solid block of ice, then the system has failed. Temperature sensor may read the readings incorrectly, forcing the motor to work without defrosting breaks.
Modern units are often equipped with additional fans, even in drip models, to improve circulation. But even in them, the main heat exchange occurs through the rear panel. Violation of the tightness of the circuit or clogging of the channels leads to the fact that moisture crystallizes faster than it is removed.
Violation of the tightness of the door seal
One of the most common causes of excess icing is a loose fit of the door to the body. Through the resulting cracks, warm air from the room constantly penetrates into the chamber. It contains a large amount of moisture, which instantly condenses on cold surfaces. Rubber seal Over time, it loses elasticity, cracks or deforms, ceasing to perform its function.
You can check the tightness with a simple test using a sheet of paper. Clamp the sheet with the door around the entire perimeter. If the paper comes out easily and without resistance, it means that the seal does not fit in this place. Also visually inspect the rubber for cracks, tears or dirt that may interfere with tight contact.
⚠️ Attention: If the seal is simply dirty, it can be washed with a soapy solution. If the rubber becomes dull or torn, a complete replacement of the part will be required. You can temporarily restore elasticity by heating the rubber with a hairdryer, but this is only a temporary measure.
Often the problem lies not in the rubber itself, but in the misalignment of the door. This can happen due to improper installation of the refrigerator or loose hinges. In this case, one part of the door will fit tightly, and a gap will form in the other part. Adjusting the hinges allows you to eliminate the distortion and restore the tightness of the circuit.
The constant penetration of warm air forces the compressor to work almost non-stop, trying to compensate for the loss of cold. This not only leads to the formation of massive ice on the back wall, but also significantly increases energy consumption. Ignoring the problem can lead to failure of the compressor motor due to overheating.
Clogged drainage hole
The drainage hole is the “neck” of the entire moisture removal system. It is located at the bottom of the rear wall of the refrigerator compartment. Water flows through it into the tray. If this channel becomes clogged with crumbs, mold or pieces of ice, the water has nowhere to go. It remains at the bottom of the groove, freezes and gradually increases the volume of ice, rising higher along the wall.
Cleaning the drainage is a procedure that can be performed independently without special tools. You will need a thin flexible wire, a brush or a special soft tube. Carefully insert the tool into the hole and clean the canal, being careful not to damage its walls. After mechanical cleaning, it is recommended to rinse the hole with warm water from a syringe or syringe without a needle.
If the water stays in the groove and does not drain, this is a sure sign of a blockage. In some models, access to the drain may be obstructed by a removable shelf or drawers. Before starting work, be sure to unplug the refrigerator from the network and defrost it so that the ice in the channel melts and does not interfere with cleaning.
☑️ Cleaning the drainage system
After cleaning, check whether the water flows freely. To do this, you can pour a small amount of liquid into the groove. If it disappears quickly, then the problem is solved. Regular preventative cleaning will help avoid a recurrence of the situation in the future. Clogged drainage is one of those malfunctions that is easier to prevent than to eliminate the consequences.
Malfunctions of the thermostat and temperature sensors
Thermoregulator (thermostat) is The “brains” of the cooling system, which tells the compressor when to turn on and when to turn off. If this device fails, it may transmit incorrect signals. For example, the sensor may “think” that the chamber is too warm and cause the motor to run continuously. As a result, the back wall freezes through, becoming covered with a thick layer of ice.
Diagnostics of the thermostat requires a multimeter and certain skills. The device is tested for resistance in different temperature conditions. If the circuit does not open when cooling, the thermostat must be replaced. In modern models with electronic control, thermal sensoris responsible for this process, which can also cause errors in readings.
Symptoms of a malfunctioning thermostat are:
- ❄️ The compressor works without interruptions, not turning off.
- 🧊 The food in the refrigerator freezes, although the mode has not changed.
- 💧 The back wall is covered with a dense layer of ice or snow.
- 🔊 The motor hums louder than usual due to prolonged operation.
Replacing a thermostat usually does not take much time, but it does require disassembling part of the refrigerator body. It is important to install a similar part with the same parameters, otherwise the temperature regime will be disrupted. Incorrect operation automations are a common cause of problems in old refrigerators, where the service life of the parts has already been exhausted.
Is it possible to temporarily do without replacing the thermostat?
Theoretically, you can manually turn off the refrigerator, but this is not a solution to the problem. Constant temperature changes will spoil the food and may damage the compressor. It is better to replace the part immediately.
The effect of improper operation on icing
Often the causes of icing lie not in breakdowns, but in the actions of the user himself. Violating the rules for storing food and placing objects in the chamber may disrupt air circulation. If food is pressed closely to the back wall, they freeze to it, blocking the outflow of moisture and heat exchange.
Have you put a hot pot of soup in the refrigerator? This is guaranteed to lead to the formation of condensation and subsequent ice. The evaporation of moisture from a hot dish sharply increases the humidity in the chamber. The system does not have time to remove this volume of water, and it settles on the coldest surfaces. Hot products They also force the compressor to wear out.
Another common mistake is storing food in open containers. Liquids and wet foods without a lid actively release moisture into the air. This moisture settles on the walls and freezes. Always use containers with lids or cling film for storage.
The refrigerator door should not be left open longer than necessary. Each opening lets in a portion of warm, moist air. If you spend a long time looking for the right product, keeping the door open, you contribute to excessive condensation.
Comparison of symptoms: normal or breakdown
To accurately determine whether you need the help of a specialist, it is important to be able to distinguish the normal operation of the equipment from signs of a malfunction. Below is a table that will help classify the condition of your refrigerator.
| Symptom | Normal | Fault |
|---|---|---|
| Layer frost | Thin, uniform, melts when the engine stops | Thick crust of ice, does not melt during a pause |
| Compressor operation | Cyclic (works/rests) | Works without interruptions or very rarely |