Looking inside a working refrigerator, we usually see only shelves, drawers and lighting. However, hidden behind the plastic walls is a complex engineering system that ensures the safety of products. Understanding how it works helps owners not only treat equipment more carefully, but also quickly diagnose faults. refrigeration unit, helps owners not only treat equipment more carefully, but also quickly diagnose faults.
Inside the case Indesit hides a whole world of tubes, sensors and insulating materials. The design may vary depending on the model: be it a classic system with a weeping evaporator or a modern No Frost. Studying the internal space allows you to understand the principles of refrigerant circulation and the operation of electronics.
In this article we will analyze the anatomy of the device so that you can imagine the processes occurring behind the external panels. This knowledge will be useful during independent diagnosis or before calling a technician, when you need to accurately describe the problem.
Internal housing design and thermal insulation
The internal chamber of the refrigerator is a monolithic or prefabricated container made of impact-resistant plastic. The space between the outer metal casing and the inner plastic is filled polyurethane foam. It is this material that is responsible for maintaining cold and energy efficiency of the entire device.
The quality of foaming directly affects the operation of the compressor. If there are voids or “cold bridges” in the insulation, the equipment will wear out. Models Indesit use high-pressure foaming, which creates a uniform layer without gaps.
⚠️ Attention: It is strictly forbidden to try to drill the chamber walls yourself or drive nails into them for shelves. Damage to the internal circuit will lead to failure of thermal insulation and corrosion of the metal, and in systems with freon - to leakage of refrigerant.
On the back wall of the main chamber there is often a channel for draining melt water. In simple models, this is a gutter that goes into the drainage hole. Its condition is critical to prevent the formation of puddles at the bottom of the refrigerator.
Cooling system: evaporator and air circulation
The heart of the refrigeration system is evaporator. In classic “crying” type models, it is hidden behind the rear panel of the refrigerator compartment. When the compressor is running, the evaporator tubes are cooled, freezing with frost, which then melts when the engine is stopped.
In systems No Frost (or Full No Frost) the design is radically different. Here the evaporator is placed in a separate hidden compartment, usually located behind the back wall of the freezer or at the top of the device. The air is forced by a fan through this heat exchanger and distributed among the chambers through special channels.
- ❄️ Crying system: condensation flows down the back wall into the drainage, providing natural humidity.
- 🌬️ No Frost: dry cold, no ice, uniform temperature throughout volume.
- 🔄 Multi-flow: several air supply channels to quickly restore the temperature after opening the door.
It is important to note that in two-compressor models Indesit a separate evaporator is responsible for each circuit. In single-compressor systems with one motor, solenoid valveis used, which switches the freon supply between the freezer and refrigerator compartments.
Freezer compartment: structure and nuances
Freezing compartment inside refrigerators Indesit can be made in the form of closed plastic boxes or open shelves-baskets. The interior space here is exposed to the most extreme temperature loads, so the materials must withstand deep cold without cracking.
If you look behind the plastic freezer panel in the models No Frost, you can see that same hidden evaporator and fan. It is the fan that creates noise during operation and ensures air circulation. The fan blades should rotate freely, without jamming.
| System element | Location | Function |
|---|---|---|
| Evaporator | Behind the back wall (hidden) | Air flow cooling |
| Defrost heating element | Melt frozen ice | |
| Defrost sensor | On the pipe evaporator | Defrosting temperature control |
| Fan | Freezer air duct | Forced circulation |
At the bottom of the freezer there is often a collection tray melt water. In good condition, the water from it evaporates naturally due to the heat from the compressor, which is located in a niche at the bottom of the device.
Why does ice freeze in the freezer?
If a “fur coat” forms in the No Frost freezer, this means that the defrosting system has failed. Either the heating element has burned out, or the sensor is stuck, or the water drainage channel is clogged.
Technical niche: compressor and condenser
Having removed the back metal cover from the outside of the refrigerator, you find yourself in the technical compartment. What dominates here compressor is a black metal cylinder, which is the pump of the entire system. It creates the pressure necessary to circulate the refrigerant through the tubes.
Next to the motor there is a grill condenser (often black, similar to a coil). Here, hot freon gives off heat to the environment, passing from a gaseous state to a liquid one. Dust on the condenser significantly impairs heat transfer, causing the refrigerator to work longer.
Also in the technical niche you can see:
- 💧 Plate for collecting condensate: installed above the compressor, water drips onto the hot motor and evaporates.
- 🔌 Start relay: a small block on the compressor housing that starts the engine.
- 🧊 Filter drier: a copper cylinder that cleans freon from moisture and debris.
Maintenance of this area requires caution. Before any cleaning, the technical compartment must be de-energized and the compressor must be completely cooled.
⚠️ Attention: The condenser and evaporator tubes in modern models are often made of aluminum. They are very soft and easily break through with careless brushing. Use only soft rags or a vacuum cleaner.
Electronic filling and sensors
Modern refrigerators Indesit are controlled electronically. Inside the housing, often near the ceiling of the refrigerator compartment or in a technical niche, there is a control board. It receives signals from many sensors.
The key element is thermostat (or an electronic temperature sensor). It “monitors” the temperature inside the chambers and gives the command to the compressor to turn on or off. In models with a display on the door, the signal is transmitted through loops passing inside the hinges or the body.
Main controlled parameters:
- 🌡️ Air temperature in the refrigerator compartment.
- ❄️ Evaporator temperature (to control defrost cycles).
- 🚪 Door position (reed switch contact).
If the electronics fail, the refrigerator may stop freezing or, conversely, work without stopping. Diagnostics requires special knowledge and equipment, since it is not always possible to visually identify a burnt-out microcircuit.
☑️ Diagnostics before calling a technician
Frequent problems with the internal structure
Knowing what the refrigerator looks like inside helps to understand the causes of breakdowns. For example, if there is water at the bottom of the refrigerator, the drain hole is most likely clogged. It can be cleaned with a special flexible stick or soft wire.
If the refrigerator hums more than usual, the problem may be vibration of the tubes in the technical niche or wear of the fan bearings. In models No Frost extraneous noise is often produced by the fan, on the blades of which ice could have frozen.
Breaking the tightness of the door seal leads to a constant influx of warm, moist air. Inside, this is reflected in the abundant formation of frost on the back wall or products. The defrosting system cannot cope with the volume of moisture, and ice blocks the circulation channels.
Is it possible to wash the inside of the refrigerator using steam?
Use Steam cleaners inside the refrigerator Indesit are not recommended by manufacturers. The high temperature of the steam may deform the plastic inner shell and damage the insulating foam. In addition, excess moisture can get into the electrical contacts.
Why is the back wall of the refrigerator covered with ice?
In “crying” models, a light layer of frost during compressor operation is the norm. However, if a thick ice crust forms, this indicates a malfunction of the thermostat (does not turn off the motor) or a problem with the door seal that allows air to pass through.
How often do you need to defrost an Indesit refrigerator?
Models with the system No Frost do not require manual defrosting, it is enough to wash them 1-2 times per year. It is recommended to defrost classic models with a “crying” wall completely 2 times a year for hygiene and checking the drainage system.
What to do if an unpleasant odor appears inside?
You need to find the source (spoiled product) and thoroughly wash the chamber with a solution of soda or vinegar. The smell may also come from the drainage hole - it needs to be cleaned with a brush. Activated carbon or special odor absorbers will help freshen the air.