Owners of two-chamber refrigerators Indesit often face a situation where a dense ice crust or icicles form on the inner surface of the back wall of the chamber. This phenomenon not only reduces the usable volume for storing food, but can also signal a malfunction of the cooling system. Unlike older models with manual defrosting, modern units must independently cope with moisture removal, so the appearance of ice where it should not be requires attention.
There can be several reasons for this behavior of the equipment: from a banal violation of operating rules to serious technical malfunctions No Frost systems or the capillary drain. Understanding the physical processes occurring inside the refrigerator compartment will help you quickly diagnose the problem and make a decision - call a technician or try to fix the problem yourself. In this article we will analyze in detail all the possible factors influencing freezing.
The first thing to do when you detect ice is not to panic and carry out an initial visual diagnosis. Often the problem lies in small things that can be easily fixed without calling service. However, ignoring the symptoms can lead to compressor failure or swelling of the internal panels of the housing due to expanding ice.
The principle of operation of the moisture removal system
To understand why icing occurs, it is necessary to briefly consider the design of the rear wall. In refrigerators Indesit with a system No Frost or Low Frost the evaporator is hidden behind a plastic panel. It is there that the air is cooled, which is then distributed throughout the chamber by a fan.
The moisture contained in the air and released by the products settles on the cold evaporator in the form of frost. The heating element (heating element) is periodically turned on, which melts this frost. The resulting water flows down the groove into the drainage hole and through the tube into the container above the compressor, where it evaporates.
If this cycle is disrupted, the water does not have time to leave and freezes right at the outlet of the channel or on the wall. Drainage system is the heart of the moisture removal process, and any failure in its operation is instantly reflected in the condition of the internal surface chambers.
How does the defrost cycle work?
In automatic mode, a timer or electronic module turns off the compressor at certain intervals (usually 8-12 hours) and turns on the evaporator heating element. Heating continues for several minutes until all the ice has melted. Then the system goes into cooling mode again.
Violation of the rules of operation and storage of food
Before looking for a breakdown, it is worth analyzing how you use the refrigerator. Often the cause of freezing is the human factor. For example, if you place hot pots or just warm dishes in the chamber, the cooling system does not have time to cope with the sudden release of steam.
Moisture condenses on the coldest surface - the back wall - and instantly turns into ice. It is also important to check the integrity of food packaging. Open containers with liquid (soups, compotes) actively evaporate water, increasing the humidity inside the chamber.
Another critical point is the loading density. If food is placed close to the back wall, it blocks the outlet for cold air and interferes with normal heat exchange. In the area of contact with plastic, the temperature drops below normal, which provokes local icing.
⚠️ Attention: Never place food in the refrigerator whose temperature exceeds room temperature. This creates an extreme load on the compressor and is guaranteed to lead to the formation of a “fur coat” on the walls.
Clogged drainage hole
One of the most common technical reasons for the appearance of ice is a banal clogging of the drainage channel. During operation, food particles, crumbs, mold or simply mucus can get there, which hardens over time and clogs the tube.
Water from melted frost cannot go into the drip and begins to accumulate in the groove. During the next cooling cycle, this water freezes, building up a thicker ice plug layer by layer. Over time, ice may extend beyond the groove and cover part of the back wall.
To check and clean, you can use a soft wire, a cotton swab or a special brush-brush. Carefully push through the blockage and flush the channel with warm (not hot!) water from a syringe to make sure there is free flow.
☑️ Cleaning the drainage
Malfunctions of the No Frost system and sensors
If everything is in order with the drainage, the problem may may lie in the electronics or components of the defrost system. In refrigerators Indesit several key elements are responsible for this process: Evaporator heating element, a defrost sensor and a timer (or electronic control module).
If the heating element is burnt out, the frost on the evaporator will not melt. Over time, the layer of ice becomes so thick that it blocks the air circulation channels. The fan begins to hum, trying to force air through the icy mess, and the temperature in the chamber rises. As a result, some of the ice may leak through the ventilation holes onto the rear wall.
The defrost sensor also often fails. It is responsible for turning off the heater when the ice has melted. If it “lies” or shorts out, the heating element may heat for too long (melting the plastic) or not turn on at all. Diagnostics of these elements requires multimim and knowledge of electrical circuits.
The table below shows the main symptoms of malfunctions of the No Frost system components:
| Component | Fault symptom | Consequence |
|---|---|---|
| Heating element evaporator | Does not heat, resistance is infinite | Ice build-up on the evaporator, lack of cold |
| Defrost sensor | Does not open the circuit or does not close | Overheating evaporator or lack of defrosting |
| Fan | Does not spin, makes noise | Cold does not enter the chamber, there is no blowing |
| Air duct damper | Stuck in closed position | It’s warm in the chamber, there’s ice on the evaporator |
Problems with sealing and tightness
The constant supply of warm, moist air from outside is another reason profuse freezing. If the rubber seal door is damaged, dirty or simply does not fit tightly, air from the kitchen is constantly sucked into the chamber.
Moisture from this air settles on the back wall. You can check the tightness with a simple test: hold a sheet of paper with the refrigerator door and try to pull it out. If the paper is removed easily without resistance around the entire perimeter, the seal requires replacement or adjustment.
It is also worth checking the door hinges. Over time, they can weaken and cause the door to warp, creating a gap at the top or bottom. Visually this may not be noticeable, but a millimeter gap is sufficient for air circulation.
⚠️ Attention: A dirty seal does not ensure tightness. Regularly wipe the rubber band with a damp cloth and lubricate it with silicone so that it remains elastic and does not crack.
Freon leakage and compressor operation
A more serious problem is refrigerant leakage (freon). When there is little gas in the system, the compressor starts working almost non-stop, trying to reach the set temperature. In this mode, the back wall (where the evaporator is located) freezes unevenly.
A picture is often observed when ice freezes only in one corner or in a strip. This is due to the fact that freon does not fill the entire evaporator circuit evenly. In two-chamber models Indesit this can lead to food spoiling in the refrigerator compartment and an “icicle” hanging on the wall.
It is difficult to diagnose a leak on your own, but an indirect sign is a hot compressor and the absence of a characteristic gurgling or hissing sound during operation. In this case, you cannot do without a master and sealing the circuit.
When professional repairs are required
You can clean the drainage, check the seal and defrost the unit yourself. However, if after complete defrosting (within 24 hours with the doors open) the problem returns after 2-3 days, the problem is in the hardware.
Replacing the heating element, sensors, thermostat or finding a freon leak requires disassembling the rear panel, using special tools and electrical knowledge. Unqualified intervention can lead to damage to plastic parts or a short circuit.
You need to be especially careful with models where the evaporator is foamed into the housing. Violation of the tightness of the foam during careless disassembly will reduce the efficiency of the refrigerator to zero.
FAQ: Frequently asked questions
Is it normal that the back wall is covered with frost?
In refrigerators with a system Direct Cool (drip system) a light matte coating of the rear wall with moisture or a thin layer of frost during compressor operation is the norm. The water should bead up and flow down when the compressor turns off. If a thick crust of ice or icicles grows, this is a malfunction.
How often do you need to defrost an Indesit refrigerator?
Models marked No Frost do not need complete defrosting, it is enough to wash them 1-2 times a year. Models with a drip system (“Weeping Wall”) also do not require frequent defrosting, but preventive shutdowns for 10-12 hours every six months will extend the life of the equipment.
Is it possible to scrape ice with a knife?
It is absolutely not possible! Mechanical removal of ice with sharp objects can damage the evaporator, which is located immediately behind the plastic. A hole in the evaporator will lead to an immediate release of freon and expensive repairs. Use only warm water and natural defrosting.
Why does the refrigerator freeze, but the water does not drain?
Most likely, an ice plug has formed in the drainage channel. This happens if the channel is narrow or poorly insulated. Try cleaning it carefully with a brush and filling it with warm water. If the problem recurs, it may be necessary to insulate the tube or replace the drainage tray.