Owners of refrigerators Indesit, especially models with the No Frost system, often encounter an unpleasant phenomenon: on the back inner wall of the freezer or refrigerator compartment begins to form layer of ice or snow coat. This is not just an aesthetic defect that interferes with the overview of the products, but also a serious signal that the unit has malfunctioned. Ignoring this problem can lead to failure of the compressor or complete defrosting of the contents.
The reasons for the appearance of ice can vary from a simple violation of operating rules to complex technical malfunctions of the defrost system. In refrigerators No Frost ice should not appear on the walls by definition, since air circulation and periodic heating of the evaporator should prevent moisture condensation. If you notice that the back wall is covered with frost, you need to conduct a thorough diagnosis.
In this article we will analyze in detail the main components responsible for removing moisture, consider typical breakdowns and methods for eliminating them. You will learn how to independently check the serviceability of the heating element, thermostat and sensors, and also understand in which cases you will need to call a specialist. It is critically important not to continue operating a refrigerator with obvious ice for more than 2-3 days, as this creates excess load on the motor-compressor.
The principle of operation of the No Frost system and the role of defrosting
To understand why the problem occurs, you need to briefly consider the design of refrigerators Indesit with technology No Frost. Unlike older models with a weeping evaporator, here the moisture from the products does not settle on the walls of the chamber, but is removed outside it. The air circulates through a hidden evaporator located behind the rear panel, where it is cooled and dried.
When working on a hidden evaporator, frost will inevitably form from the moisture contained in the air. An automatic defrost system is used to remove this ice. Periodically, usually every 8-12 hours, the compressor turns off and turns on Defrosting heating element. The heated element melts the ice, the water flows into the drain pan and evaporates. If this cycle is disrupted, ice begins to appear inside the chamber.
⚠️ Attention: Attempts to chip the ice with a knife or other sharp objects may lead to puncture of the evaporator. In this case, the refrigerant will leak out, and repairs will become economically unfeasible.
Failure in the defrost system is the most common cause of icing. It may be caused by a burnt-out heating element, a stuck timer, or a malfunctioning temperature sensor. Each of these elements plays its role in maintaining the balance of temperature and humidity inside the unit.
Malfunctions of the defrost system: heating elements, timer and sensors
If ice appears on the back wall of your Indesit here, first of all suspicion falls on the components of the defrost system. Most often it fails TEN (tubular electric heater). Over time, the spiral inside the tube burns out, and the ice stops melting, growing layer by layer. You can check it with a multimeter for resistance: if the device shows an open circuit, the element must be replaced.
The second important element is defrost timer or the electronic control module. It is he who is responsible for switching operating modes: cooling or defrosting. Mechanical timers can get stuck in the “cooling” position, which is why the command to turn on the heating element simply does not arrive. In modern models, this function is performed by a control board, which can also malfunction due to power surges.
The third component is defrost sensor (defrost thermostat). It controls the evaporator temperature during defrosting. If the sensor is “stuck” in the “low temperature” position, it will not allow the heating element to turn on, even if the timer gives a signal. Conversely, if it does not open the circuit when the desired temperature is reached, the heating element may heat up for too long.
☑️ Diagnostics of the defrost system
To replace these parts, it is often necessary to completely defrost the refrigerator within 24 hours. Only after all the ice has been removed can the hidden evaporator be accessed and measurements taken. Do not forget that assembly must be done in the reverse order while maintaining tightness.
Problems with sealing rubber and tightness
Often owners look for a complex technical breakdown, while the reason lies in a simple depressurization of the chamber. Sealing rubber on the door refrigerator Indesit over time, it loses elasticity, cracks or becomes deformed. Through the resulting cracks, warm, moist air from the room constantly enters the chamber.
The cooling system tries to compensate for the heat input and operates in enhanced mode. The moisture contained in the incoming air instantly freezes on the coldest surfaces, which are often walls or air ducts. As a result, a thick layer of snow is formed, which the defrosting system simply does not have time to remove.
You can check the tightness in a simple way: hold a sheet of paper with the refrigerator door and try to pull it out. If the paper is removed easily without resistance along the entire perimeter, it means that the seal is not tightly attached. Also carefully inspect the rubber for cracks, tears or dirt that prevent it from sealing tightly.
Clogged drainage system
Even if the defrosting system is working properly and the ice on the evaporator is melting, the water must go somewhere. For this purpose, the design Indesit provides a drainage channel that drains melt water into a container above the compressor. If this channel becomes clogged with food crumbs, mold or ice blockage, the water has nowhere to go and freezes inside the compartment or under the evaporator, forming an ice block.
You can identify the blockage by the presence of a puddle of water at the bottom of the refrigerator compartment or under the vegetable drawers if the water overflows over the edge of the groove. Sometimes water freezes right at the drain inlet, blocking further flow. In this case, the ice begins to grow up the back wall.
To clean the channel, you can use a special soft wire or a long brush. Carefully insert the tool into the drainage hole and make several forward movements. After this, rinse the channel with warm water from a syringe or syringe to make sure there is a free flow.
| Symptom | Probable cause | Elimination method |
|---|---|---|
| Ice only on the evaporator (hidden) | Faulty heating element or timer | Replacement of defrost system parts |
| Ice on the back wall of the chamber | Door leakage | Replacement or restoration of the seal |
| Water at the bottom and ice below | Clogged drainage hole | Cleaning the channel and flushing |
| Uniform layer of frost | Continuous operation of the compressor | Checking the thermostat and freon pressure |
Thermostat malfunction and freon leak
If the refrigerator Indesit works without interruptions, the compressor hums constantly and does not turn off, this is a sure sign that it does not reach the set temperature. In such a situation, a dense layer of ice may form on the back wall. The reason may be a faulty thermostatthermostatfreon).
When freon leaks, the pressure in the system drops, cooling efficiency decreases, and the compressor wears out, trying to compensate for the lack of refrigerant. Moisture from the air actively condenses and freezes, since the shutdown cycle for defrosting either does not occur or is not enough to remove the increased amount of ice.
⚠️ Attention: Self-filling the refrigerator with freon is impossible without special equipment and a license. If a leak is suspected (for example, if oily stains are visible on the tubes at the back), a call to a technician is required.
It is also worth checking the temperature settings. If you accidentally set the minimum temperature or activated the “Super Freeze” mode and forgot to turn it off, the refrigerator will work in extreme mode, which will lead to ice accumulation.
What will happen if you ignore a freon leak?
The compressor will work around the clock, trying to gain temperature. This will lead to its overheating, burning of the winding and expensive replacement of the motor, the cost of which can be up to 50% of the price of a new refrigerator.
Operating rules to prevent icing
To minimize the risk of ice formation on the back wall of the refrigerator Indesit, it is important to follow the operating rules. Do not place hot or warm food in the chamber. The evaporation of moisture from a hot product creates a huge load on the drying system, and the moisture does not have time to be removed, settling on the walls.
In addition, do not fill the refrigerator with food too tightly. The technology No Frost requires free air circulation between the shelves and at the back wall. If the ventilation holes on the rear panel are covered with bags or containers, cold air will not be distributed correctly, which will lead to local hypothermia and the formation of ice.
Regularly, at least once every six months, carry out preventive defrosting of the refrigerator, even if it is equipped with a No Frost system. This will remove contaminants from the drainage and give the equipment a rest. Wipe the seals and check the tightness of the doors.
Frequently asked questions and answers (FAQ)
Is it possible to operate a refrigerator if there is some on the wall? ice?
Short-term operation is possible, but undesirable. If the ice does not prevent the door from closing and does not touch the food, there is no critical breakdown right now. However, this is a signal of an incipient problem, which is best solved before the evaporator is completely fouled.
How often should defrost occur in an Indesit refrigerator?
Depending on the model and settings, the defrost cycle usually starts every 8, 12 or 16 hours of compressor operation. This process lasts from 15 to 30 minutes. At this time, you may hear gurgling or crackling noises in the rear of the unit.
Why does ice appear in only one corner of the rear wall?
This may indicate a local air circulation problem, a misalignment of the refrigerator (check the legs) or the beginning of the formation of an ice plug in a specific place in the duct. It is also possible to blow warm air through a microcrack in the seal in this particular area.
Is it necessary to completely defrost the refrigerator to check the heating element?
Yes, to access the heating element in most models Indesit you need to remove the back panel in the freezer. If there is ice there, it needs to be completely melted, otherwise you will not be able to carefully dismantle the parts and carry out diagnostics.