Modern LG refrigerators operating using technology No Frostare complex engineering systems where cooling occurs without the formation of an ice crust on the internal walls. Unlike older drip models, forced air circulation is used here, which allows you to maintain a stable temperature in all chambers. Understanding exactly how this system works is necessary for proper operation and timely detection of malfunctions.
The basic principle of operation is based on the intensive movement of air masses inside the chambers of the refrigerator and freezer compartments. Refrigerantcirculating in a hidden evaporator, cools the air, which is then pumped by a fan through special air ducts. This ensures uniform distribution of cold, eliminating the appearance of “warm zones” and condensation on products.
It is important to note that the control system in LG models is often equipped inverter compressor, which regulates the operating power depending on the current load. This not only reduces power consumption, but also reduces noise levels. Understanding the design of such units means learning to extend the life of equipment and avoid expensive repairs.
The principle of air circulation
The key element of the system No Frost is a continuous cycle of air movement. In LG refrigerators, this process is organized so that the air passes through the evaporator located behind the rear wall of the freezer, cools there and is distributed throughout the entire volume. The fan creates the pressure necessary to overcome the resistance of the air ducts and filter.
Cold air is supplied to the top of the refrigerator compartment, as cold masses naturally fall down, displacing warmer air. This warm air is returned through the bottom vents to the evaporator area to be re-cooled. This circulation allows you to maintain the set temperature with a minimum error.
In models with the system Multi Air Flow from LG, there are many holes for air supply at different levels of shelves. This ensures that food on the bottom shelf is cooled just as effectively as food on the top shelf. The damper system automatically regulates the volume of supplied air depending on sensor readings.
The design of the hidden evaporator and heating element
Unlike traditional refrigerators, where the evaporator is visible immediately when you open the freezer, in the system No Frost it is hidden behind a plastic panel. It is on this hidden element that moisture from the air freezes. It turns on periodically Defrost heating element, which melts the formed ice, and water flows into the pan for evaporation.
The defrosting process in LG refrigerators is usually started by a timer or according to the readings of sensors that record the operation of the compressor. When the cooling cycle ends, the electronics give a command to heat up. It is important that the heating element is in good working order, otherwise the ice coat will block the air circulation channels.
Heating elements in modern models can be open type (nichrome spiral) or tubular. Their power is designed to quickly melt the ice without damaging the plastic structural elements. After defrosting, the water flows through the grooves into the drainage system located at the bottom of the unit.
Why does ice freeze only on the evaporator?
Moist air from the chambers is forcibly sucked by a fan to the coldest element - the evaporator. There the moisture instantly crystallizes. The products are already blown with dry, cold air, so they are not covered with frost.
The role of the fan and damper system
The fan is the “heart” of the circulation system in refrigerators No Frost. It is located directly next to the evaporator and works synchronously with the compressor. If the fan stops, the cold stops flowing into the chambers, although the compressor may continue to hum, trying to cool only the evaporator itself.
The damper system is responsible for dosing the cold. In dual-compressor models or full-compressor systems, dampers regulate the air flow between the freezer and refrigerator compartments. Electronics opens the damper if the sensor detects an increase in temperature in the main chamber. No Frost flaps regulate the air flow between the freezer and refrigerator compartments. The electronics opens the damper if the sensor detects an increase in temperature in the main chamber.
- 🌀 Axial fans — provide a high volume of pumped air with a low noise level.
- ❄️ Sensors temperature —send signals to the control board to open or close the air damper.
- 🔌 Damper motor —an actuator that physically closes the air supply channel.
A fan malfunction often manifests itself in the form of extraneous noise or humming. This may be due to worn bearings or freezing of the blades to the body due to a leak in the door seal.
Control system and sensors (Electronics)
The “brain” of the LG refrigerator is an electronic control board that processes signals from many sensors. Modern models use a digital diagnostic system that can display error codes on the display or signal them by flashing indicators. The main sensors monitor the temperature of the evaporator, air in the chambers and in the freezer.
The board's operating algorithm is programmed to minimize the number of defrost cycles while maintaining cooling efficiency. If the evaporator sensor shows that it has not completely thawed within the allotted time, the system can prolong heating or, conversely, increase the frequency of defrosting cycles.
In models with Smart Diagnosis the system can transmit data on the state of the nodes to the user's smartphone or to a service center. This greatly simplifies troubleshooting, allowing you to determine exactly which element has failed: the heating element, the sensor or the fan itself.
⚠️ Attention: Electronic boards of LG refrigerators are sensitive to voltage surges. When carrying out any work related to the removal of panels and access to wiring, be sure to disconnect the device from the network for at least 10-15 minutes to discharge the residual charge.
Drainage system and moisture removal
Effective operation No Frost impossible without a working drainage system. Melt water formed during defrosting of the evaporator must flow freely into a special tray located above the compressor. There, the water evaporates due to the heat generated by the running motor.
The drainage hole is located at the bottom of the evaporator niche. Over time, it can become clogged with crumbs, mold, or ice if the defrost system is not working properly. A clogged drain causes water to accumulate at the bottom of the freezer and flow out.
To clear the drain, it is often enough to use a soft wire or a syringe with warm water. However, if an ice plug has formed deep inside the insulation, you may need to completely defrost the refrigerator with it turned off for a day.
☑️ Checking the drainage system
Typical faults and their connection with the device
Understanding the device helps to quickly diagnose problems. For example, if the refrigerator hums but does not freeze, most likely the problem is in the fan or the evaporator is frozen. If the freezer is working normally, and the refrigerator compartment is warm, the damper or temperature sensor is to blame.
A frequent problem is failure Defrost heating element. In this case, the evaporator becomes overgrown with ice, which blocks the operation of the fan. The air stops circulating and the temperature in the chambers rises. The system continues to work, but to no avail, consuming electricity.
There are also problems with door seals. If warm, humid air enters the chamber, the system No Frost does not have time to remove all moisture, and ice begins to accumulate not only on the evaporator, but also on the products and walls.
| Component | Function | Symptom malfunctions | Frequency of breakdowns |
|---|---|---|---|
| Defrosting heating element | Heating of the evaporator to remove ice | Ice build-up, lack of cold | High |
| Fan | Air circulation | Noise, poor cooling | Average |
| Defrost sensor | Temperature control evaporator | Endless defrost or no defrost | Average |
| Damper | Cold flow adjustment | Freezing or heat in the chamber | Low |
Operation rules for durability
In order for the complex device of an LG refrigerator to serve for a long time, you must follow simple rules. Do not place hot foods inside as this will create excess humidity that the system may not be able to handle. It is also not recommended to load the chamber with products so that they block the ventilation holes.
Regular, at least once a year, defrosting the refrigerator (even the system No Frost) will benefit it. This will remove accumulated odors and check the condition of the seals. A complete shutdown for 24 hours will help defrost hidden cavities where the normal defrost mode does not reach.
Keep the condenser located on the back wall clean. Dust and animal hair impair heat transfer, forcing the compressor to work under increased load. Cleaning the rear panel with a vacuum cleaner is a simple procedure that prolongs the life of the motor.
⚠️ Attention: Technical characteristics and location of components may vary depending on the specific series and year of manufacture of the LG refrigerator. Always check the official instructions for your model before disassembling.
Frequently asked questions (FAQ)
Why does water appear on the back wall of the LG No Frost refrigerator?
In normal mode, water appears on the back should not appear on the wall of the refrigerator compartment, since there is no direct contact with moist air. If you see drops, the drain hole may be clogged or the door seal is broken, allowing warm air to enter the chamber.
How often should the fan in an LG refrigerator turn on?
The fan runs almost constantly while the compressor is running. It can stop only when the door is opened (in some models) or in pauses between cooling cycles, when the set temperature is reached.
Is it possible to use an LG refrigerator without the top evaporator cover?
It is absolutely not possible. The cover forms an air channel. Without it, the fan will circulate air chaotically, the cooling efficiency will drop to zero, and the food in the freezer may spoil.
What does the Er FF error code on the display mean?
This code usually indicates a malfunction of the freezer fan (Freezer Fan). This could be a broken circuit, jamming of the blades with ice, or failure of the motor itself.
Is it necessary to defrost the LG No Frost refrigerator?
Technically, the system itself removes moisture, but once every 6-12 months it is recommended to carry out a complete defrost for 12-24 hours for hygienic cleaning and removal of microscopic deposits ice in hard-to-reach places.