A modern LG refrigerator is a complex electronic device, the operation of which is radically different from the operating principles of old Soviet units. Many users mistake normal technological processes for breakdowns, panicking when strange sounds appear or the side walls heat up. Understanding the physiology of the operation of inverter compressor and the system No Frost will help you distinguish normal mode from a real malfunction.
The main task of the device is not just freezing, but maintaining a stable microclimate with minimal energy consumption. If your appliance makes quiet clicks, hums, or periodically heats up on the sides, this is not a reason to call a repairman. In this article, we will analyze in detail how exactly a LG DoorCooling+ or classic model should function, so that you can be sure of the safety of your products.
It is important to understand that the temperature control algorithms in modern models are programmed for a long service life, and not for instantaneous achievement of cold. The normal temperature inside the chamber is established only 4-6 hours after the first turn on or complete defrosting. Until this point, the device can operate in enhanced mode, which is absolutely normal situation to stabilize the state of the refrigerant.
Normalization of compressor operation and sound effects
The heart of any refrigerator is the compressor, and in LG models most often inverter units are installed aggregates Linear Inverter. Unlike older motors that either hummed full blast or were silent, the inverter operates smoothly, constantly adjusting its speed. Therefore, you can hear a low, monotonous hum, which either subsides or intensifies. This is a sign of proper operation of the system, which is trying to accurately maintain the set data. Temperature Settings.
In addition to the hum of the motor, a working device can make other sounds that often frighten inexperienced users. Periodic gurgling, liquid pouring or hissing is the sound of refrigerant (freon) moving through the pipes. Even when the compressor is turned off, gas can continue to circulate due to the pressure difference. Also characteristic are the clicks produced by thermal relay or valves when switching modes.
- 🔊 Quiet hum or low-frequency hum that changes tone - the work of the inverter motor.
- 💧 Gurgling, murmur, the sound of shimmering water - freon circulation in the cooling circuit.
- ⚡ Sharp but rare clicks - activation of the start relay or damper Multi Air Flow.
- 🌬 Whistling sound - air movement through the system vents No Frost.
⚠️ Caution: If you hear a loud metallic clanging sound, a hammer-like noise, or a high-pitched squealing sound that does not stop after restarting, this may indicate mechanical damage to the compressor or a foreign object in the fan area.
The intensity of the noise also depends on the installation. If the refrigerator is not level, vibrations from the compressor will be transmitted to the cabinet and floor, increasing the hum. Make sure that the legs are adjusted and there is a gap of at least 5-7 cm between the back wall of the appliance and the kitchen wall for free air circulation.
Heat transfer and heating of the side walls
One of the most common questions concerns the heating of the external surfaces of the case. In older models, there was a black grille at the back - a condenser that dissipated heat. In modern LG refrigerators, in order to improve the aesthetic appearance and facilitate cleaning, the condenser tubes are mounted directly into the side walls or into the partition between the freezer and refrigerator compartments.
Consequently, during the active phase of operation, especially in the hot season or immediately after loading a large amount of warm food, the side panels can become noticeably hot. Surface temperatures can reach 40-50 degrees Celsius. This is not a defect, but proof that heat exchange is successful: heat is removed from the chambers and removed outside.
The heating intensity depends on several factors that should be taken into account during operation:
- 🌡️ Room temperature: the hotter it is in the kitchen, the more active the condenser works.
- 🚪 Frequency of door openings: warm air entering causes the system to work harder.
- 🍲 Volume of loaded products: warm food requires more energy for cooling.
If only one local point is hot, for example, the area around the door seal or a specific the area of the sidewall that burns your hand, it is worth checking the tightness of the door. However, in most cases, uniform heating of the walls is the normal operating mode Smart Inverter Compressor.
Defrosting cycles and the No Frost system
Owners of LG equipment appreciate the system No Frost (or Total No Frost) for the absence of the need to manually scrape ice However, few people know that the evaporator defrosts automatically and regularly. Inside the device, usually at the bottom of the freezer or behind the rear panel of the refrigerator compartment, there is an evaporator on which moisture from the air freezes.
It turns on by a timer or according to sensor readings (depending on the specific model and year of manufacture). Defrost heating element. The ice melts and the resulting water flows into a special tray located above the compressor, where it safely evaporates. At this moment, you may hear a characteristic hissing or crackling sound (as if something is bursting) - this is the sound of heating and expansion of materials. After the cycle is completed, the compressor starts again.
It is important to know the signs of correct operation of the defrosting system:
- There is no frost and “fur coat” on the products and the walls of the chambers.
- They do not accumulate in the refrigerator compartment puddles of water at the bottom.
- The air in the chambers is dry, the products do not air too quickly.
If you notice that ice has begun to grow in the freezer, and icicles appear in the refrigerator compartment on the back wall, this may indicate a malfunction of the defrost sensor, heating element, or a clogged drainage channel. In normal mode, the inside is dry and clean.
What to do if the No Frost system stops working?
If you see ice, do not try to pick it off with a knife - you can damage the evaporator. Defrost the refrigerator completely (12-24 hours with the doors open). If after switching on the problem recurs after 2-3 weeks, the sensor or heating element must be replaced.
Temperature conditions and cold distribution
Modern LG refrigerators are equipped with a system Multi Air Flowthat provides cooled air through many holes located at different levels. This creates an even temperature background, eliminating “blind spots” where food could spoil faster. Control is carried out through an electronic panel, where you set target values.
For a refrigeration chamber, the optimal range is considered to be from +2 to +5 degrees Celsius. The temperature in the freezer should not exceed -18 degrees. Many models have a function Express Freeze (enhanced freezing), which forces the compressor to work continuously for several hours. In this mode, the heating of the walls and noise will be maximum - this is normal.
Below is a table of recommended settings for various types of products:
| Storage area | Recommended temperature | Type of products | Shelf life (approximate) |
|---|---|---|---|
| Top shelf | +4...+5 °C | Ready food, drinks | 2-3 days |
| Middle shelf | +2...+4 °C | Dairy products, eggs | 3-5 days |
| Bottom shelf | +1...+2 °C | Raw meat, fish | 1-2 days |
| Door | +5...+7 °C | Sauces, canned goods, drinks | By expiration date |
Do not forget that the electronics reads the temperature of the air, not the food. Therefore, immediately after loading a milk carton, the temperature inside the carton will be higher, and the system will need time to cool it down to the set values. Do not overload the chambers by blocking the ventilation holes, otherwise air circulation will be disrupted, and the sensors will show incorrect data.
Indication and diagnostic codes
LG refrigerators have an advanced self-diagnosis system. Various indicators may light up on the display to indicate the status of the device. For example, a flashing Ice Plus or Express Freeze light often means that an active freeze is in progress. If alphanumeric codes appear on the screen (for example, Er FF, Er FS, Er CO), this is a direct indication of a specific malfunction.
Error codes help the technician quickly identify the unit that has failed. For example, an error related to the freezer fan will be different from an error related to the temperature sensor. It is not worth trying to repair electronics on your own without the appropriate skills and tools, as you can aggravate the situation.
Main types of indication:
- 🟢 Steady light - normal operating mode.
- 🔴 Flashing - process in progress (freezing, defrosting) or the open door signal was triggered.
- 🔴 Flashes with a code - an error has been detected in the system.
⚠️ Attention: If an error code appears on the display, try rebooting the refrigerator by unplugging it for 10-15 minutes. If after switching on the code appears again, a visit to the service center is necessary. Do not ignore error codes, as they may indicate problems leading to food spoilage.
☑️ Diagnosing strange behavior
Frequently asked questions and operating features (FAQ)
Why does the LG refrigerator sometimes make loud noises cotton?
A loud pop or crack is most often associated with the process of thermal expansion and contraction of plastic parts of the case and internal panels when the temperature changes. This is especially noticeable after a defrost cycle or when the compressor is turned on. If the cotton is single and not accompanied by other symptoms, this is normal.
Can an LG refrigerator be installed in an unheated room?
The manufacturer does not recommend operating the device at ambient temperatures below +10°C or above +38°C. At low temperatures, the oil in the compressor thickens, which leads to breakdown, and the refrigerant stops circulating properly. It is also possible that condensation may form inside the electronics.
How often should the light inside turn on?
The backlight only comes on when the door is opened. If the door is open for more than 2-3 minutes, a sound signal sounds and the light may go out to save resources (depending on the model). If the lamp flashes or does not light when the door is open, check whether the switch button in the doorway is stuck.
Why does condensation form in the refrigerator compartment on the back wall?
In models with the system Smart Moisture Control or conventional No Frost a small amount moisture on the back wall is acceptable. However, if puddles form, check to see if the drain hole (usually located at the bottom of the back wall) is clogged. Also, the reason may be storing food without lids, which actively evaporate moisture.
Understanding how your LG refrigerator should work is the first step to its long and trouble-free service. Compliance with installation rules, timely cleaning and attention to device signals will avoid costly repairs. Remember that modern technology is “smarter” than it seems, and most frightening sounds are only evidence of complex processes that keep your food fresh.