The appearance of a snow coat or ice crust on the back wall of the refrigerator compartment is a common complaint from equipment owners Indesit. Many users are faced with a situation where products freeze to the shelves, and ventilation is disrupted due to growing ice. Although modern models are often equipped with a system No Frost, in classic versions with a drip defrosting system, ice formation is part of the operating cycle, but only within certain limits.
If the ice layer becomes too thick, blocks air access or goes into the freezer, this signals a malfunction. Temperature violation can be caused by an incorrect operation and technical malfunctions of the unit components. Understanding the nature of this phenomenon will help to avoid costly repairs or damage to products.
In this article we will take a detailed look at the physical processes occurring inside the chamber and analyze the main causes of excess icing. You will learn how to distinguish normal operation from a breakdown and what steps need to be taken to fix the problem.
The principle of operation of the drip system and the formation of frost
Most models Indesit of the budget and middle class are equipped with the so-called “crying” or drip defrosting system. Unlike No Frost, where the evaporator is hidden and blown by a fan, here it is located directly on the back wall of the refrigerator compartment. During operation of the compressor, the evaporator tubes are cooled, and moisture from the air condenses on them, turning into frost.
When the compressor is turned off, the temperature of the evaporator rises, and the accumulated frost melts, flowing into a special pan. This is the normal operating mode. However, if the cycle is disrupted, the water does not have time to drain and freezes, forming an ice crust. Condensation is a natural product of the interaction of warm air with cold surfaces, and its amount depends on the humidity in the chamber.
It is important to understand that the thin layer of frost that periodically disappears does not is a defect. A problem is when the ice does not melt completely or grows faster than it can evaporate. In such cases, the operating efficiency of the refrigeration unit falls, and the load on the compressor increases.
⚠️ Attention: If you notice that the back wall is covered with ice immediately after defrosting, this may indicate a violation of the tightness of the circuit or freon getting into the space between the wall and evaporator.
Violation of the tightness of the door and seal
One of the most common causes of excess moisture entering the chamber is a loose fit of the door. If sealing rubber band (the cuff) is worn out, dirty or deformed, warm air from the room constantly enters the refrigerator. The humidity of this air is high, and upon contact with the cold back wall, it instantly condenses and freezes.
You can check the tightness with a simple test: hold a sheet of paper with the door and try to pull it out. If the paper is removed without effort in different places around the perimeter, it means that the seal is not fulfilling its function. The reason may also be that the door is skewed due to improper installation or loose hinges.
The constant flow of warm air forces compressor to work almost non-stop, trying to reach the set temperature. This leads not only to the formation of a “snow coat”, but also to increased energy consumption. Regular cleaning of the seal and checking its condition will help avoid these problems.
☑️ Diagnosis of the seal
In some cases, even a new seal may not fit tightly if crumbs or sticky stains from food have stuck to its surface. Thorough washing with warm soapy water often solves the problem.
Malfunctions of the thermostat and sensors
The thermostat (thermostat) is a device that controls the temperature inside the chamber and gives the command to the compressor to turn on or off. If this element fails, the refrigerator may not “see” that the temperature has already dropped to the desired level and continues to freeze. As a result, a thick layer of ice grows on the rear wall.
In models with electronic control, temperature sensors the electronic module is responsible for this process. A failure in the sensor readings can lead to similar consequences. Often, a breakdown of the thermostat is accompanied by the fact that the food in the refrigerator compartment begins to freeze, and in the freezer, on the contrary, the temperature may not be low enough.
⚠️ Attention: Replacing the thermostat requires certain skills and tools. If you are not confident in your abilities, it is better to contact a specialist, as incorrect installation can lead to freon leakage.
Thermostat diagnostics are usually carried out using a multimeter. When the sensing element (bellows) cools or heats, the contacts must close or open. If this does not happen, the part must be replaced.
How to check a mechanical thermostat?
To check a mechanical thermostat, you need to remove it, immerse the sensitive tube in cold water with ice and ring the contacts. If there is no click or change in resistance during cooling, the part is faulty.
Problems with the defrosting system (heating element, timer, relay)
Although drip systems do not have full cyclic defrosting as in No Frost, some models Indesit may have additional heating elements for the evaporator or drainage zone. If we are talking about combined systems or models with partial No Frost, then a malfunction of the defrost heating element, timer or defrost relay is critical.
If the defrost heater fails, the frost on the evaporator does not melt during a pause in the compressor operation. Over time, the layer of ice grows and begins to interfere with normal air circulation. Ice can even squeeze the back wall into the chamber, which visually looks like swelling of the plastic.
Checking the defrost circuit includes testing the heating element for a break and checking the integrity of the defrost fuse. Often it burns out fuse, which protects the system from overheating in case of sticking relay contacts.
| System element | Function | Fault symptom | Check method |
|---|---|---|---|
| Defrost heating element | Heating the evaporator to melt ice | Ice does not melt, the compressor runs longer | Testing for resistance |
| Defrost timer | Switching modes (cooling/defrosting) | The refrigerator does not go into defrost | Checking gear rotation, continuity |
| Thermoregulator | Temperature control in the chamber | Continuous operation or frequent switching on | Immersion test in cold/heat |
| Sealer | Sealing the chamber | Ice build-up around the perimeter and behind | Visual inspection, test with paper |
Clogged drainage hole
Water formed when frost melts on the rear wall must drain freely through the drainage hole into the pan located above the compressor. If this hole becomes clogged with crumbs, mold or dirt, the water has nowhere to go. It accumulates at the bottom of the back wall and freezes, forming an ice plug.
Over time, this plug grows upward, covering an increasingly larger area of the back panel. As a result, the lower part of the chamber can be flooded with water, which turns into ice, and the upper part of the wall becomes overgrown with frost. Cleaning the drainage is one of the simplest procedures that you can do yourself.
For cleaning, you can use a soft wire, a brush or a special liquid for cleaning the drainage. The main thing is to act carefully so as not to damage the plastic tubes inside the case. Regular preventive cleaning will prevent the formation of ice jams.
If ice has already formed in the channel, the refrigerator will need to be completely defrosted within 10-12 hours. Only after the ice inside the channels has completely melted can you begin mechanical cleaning.
Refrigerant leakage and other technical reasons
A more complex and rare cause of icing of the rear wall may be a leak freon or clogged capillary tube. When refrigerant leaks, the pressure in the system drops and evaporation occurs unevenly. Ice can build up only at the leak site (often this is a “crying” evaporator sealed into the wall) or, conversely, disappear completely.
If a leak occurs, the refrigerator can work non-stop, trying to gain temperature, but there will be no effect. In some cases, swelling of the rear wall of the refrigerator compartment is observed due to expansion of the insulation, which has absorbed moisture due to depressurization of the circuit.
Blisting of the rear wall of the Indesit refrigerator is a serious defect that requires opening the case and replacing the evaporator or foaming again, which is often not economically feasible. Repair in this case should only be carried out by a qualified technician with the necessary equipment.
It is also worth mentioning the contacts of the compressor start relay sticking, which is why the motor runs without interruption. This leads to deep freezing of the entire volume of the chamber and the formation of ice build-ups.
Operating rules for preventing icing
Following simple operating rules will help to significantly reduce the likelihood of excess ice forming. First of all, do not put hot or warm food in the refrigerator. The evaporation of moisture from them sharply increases the humidity, which immediately settles on the cold walls.
Always close the door tightly and do not keep it open longer than necessary. Check the packaging of products: it is better to cover open containers with liquid (soups, compotes) with a lid or film. This will reduce the amount of moisture entering the chamber air.
Regularly, at least once every six months, completely defrost the refrigerator, even if it is equipped with a Drop or No Frostsystem. This will clear the drainage, check the seals and remove the accumulated odor.
Is it possible to scrape ice with a knife?
It is strictly not recommended to use sharp objects (knives, screwdrivers) to chip ice. You may accidentally damage the sealed evaporator or puncture the plastic. If the circuit is damaged, freon will leak, and repairs will be very expensive. Use only warm water for defrosting.
Why does ice appear only after loading food?
If ice appears after you have put a lot of room temperature food in the refrigerator, it means that they are releasing a lot of moisture as they cool. Try to cool food to room temperature before putting it in the refrigerator and do not overload the chamber so that air can circulate.
Is it normal for the back wall to be completely covered in ice?
No, this is not normal for a working refrigerator. The back wall should be periodically covered with a thin layer of frost, which then melts and drains. If the wall is completely hidden under a thick layer of snow or ice that does not melt, then there is a malfunction in the system that requires diagnosis.
How often do you need to defrost Indesit with a drip system?
Manufacturers recommend carrying out preventive defrosting of such models 1-2 times a year. However, if you notice active ice growth, this should be done as needed. Frequent defrosting extends the life of the compressor and maintains cooling efficiency.