The purchase of new household appliances is always accompanied by the expectation of comfort and product safety, but it is the first hours of operation that are critical for the durability of the unit. Once you've gotten the box home, removed the packaging materials, and installed the device in place, a complex physical and chemical process begins, which is technically called the initial startup of the system. At this moment, the refrigerant begins to circulate in a closed circuit, the oil in the compressor is distributed among the rubbing parts, and the electronics reads the sensor readings for calibration.
Many users mistakenly believe that it is enough to simply plug the cord into an outlet and immediately load the shelves with products, but this approach can lead to overloading the engine or incorrect formation of the temperature regime. Primary cycle work differs significantly from normal operation, since the internal environment of the chamber has not yet been cooled to the specified parameters, and the heat capacity of the walls and shelves is high. Understanding what is happening inside the case in the first day will help you avoid panic when strange sounds appear or the side walls heat up.
It is important to realize that modern models, whether Liebherr, Bosch or budget Indesit, use similar principles of thermodynamics, but can have different compressor power control algorithms. In the first minutes after applying voltage, the self-diagnosis system checks the integrity of the electrical circuits, and only after that a command is given to start the engine. This stage is the foundation for the entire subsequent service of the device, determining the efficiency of the evaporator and condenser.
⚠️ Attention: If the device was transported lying down, be sure to let it stand in an upright position for at least 4-6 hours before turning it on. The oil must completely drain into the compressor crankcase, otherwise water hammer or jamming of the piston group is possible.
Physics of the process: from starting the compressor to the first shutdown
Immediately after you have set the temperature regulator to the middle position and connected the power, a characteristic click of the start relay is heard, and the motor-compressor begins its work. At this point, the refrigerant, which is in a gaseous state, is compressed and sent under high pressure to a condenser, usually located on the back wall or built into the side panels of the case. Here, intense heat exchange interaction with the environment occurs: the gas gives off heat and condenses, turning into liquid.
Next, the liquid freon passes through a capillary tube or expansion valve, where its pressure drops sharply, which leads to instant boiling and transition to a gaseous state already inside the evaporator. It is this process of heat absorption from the internal volume of the chamber that ensures the cooling of the products. At the beginning of the cycle, the system operates at maximum power, since the difference between the temperature inside the chamber and that set on the thermostat is maximum, which requires intense engine operation.
The first cooling cycle can last from 30 minutes to 2 hours depending on the volume of the chambers, the ambient temperature in the room and the type of refrigerant. Modern inverter models, such as Samsung Digital Inverter or LG Linear Compressor, can smoothly increase speed, while classic linear compressors operate jerkily: turned on at full power - reached temperature - turned off. You should expect the first automatic shutdown of the motor only after the sensors record the achievement of target values.
Why does the refrigerator not turn off for hours?
In the first hours of operation, the thermostat may not give a command to turn off, since the heat capacity of empty plastic shelves and walls is high. In addition, if the room is hot, the heat transfer process is difficult. It is normal if after 3-4 hours the temperature inside begins to drop.
Normal sounds and noises: what can be heard during startup
During the initial startup, a new unit may make sounds that are unfamiliar to an experienced user and sometimes cause concern. However, most of them are absolutely normal consequences of physical processes occurring in the system. It is important to be able to distinguish between a normal operating hum and signals of a malfunction so as not to call a repairman for no reason.
Here is a list of sounds that are considered normal for a working device:
- 🔊 A hum or low-frequency hum is the sound of a running compressor motor, which can intensify at moments of maximum pressure.
- 💧 Gurgling, overflowing, the sound of pouring water - this is the sound of refrigerant circulation through the pipes of the system, especially noticeable in models with an open evaporator.
- 🧊 Crackling and clicking sounds are the result of thermal expansion and contraction of the plastic parts of the internal housing and evaporator with a sharp change in temperature.
- 🌬️ Fan noise is typical for systems No Frostwhere air is forced to circulate between the freezer and refrigerator compartments.
Particular attention should be paid to the sounds produced by the system No Frost. Unlike drip models, a fan is constantly running here, creating a uniform air flow. Its hum can be heard even when the door is closed, and this is not a defect. If you hear a metallic clang, knock or whistle, reminiscent of the operation of a hammer drill, this may indicate that a foreign object has entered the fan or the compressor is not fastened.
⚠️ Attention: If the hum is accompanied by strong vibration of the case, check the adjustment of the support legs. Uneven installation on the floor leads to resonance and increased noise, which is mistakenly taken for a breakdown.
Heat transfer: why do the side walls and partitions get hot
One of the most common questions that arises among owners of new equipment: why do the side walls or the partition between the freezer and refrigerator compartments become hot? The answer lies in the design of a modern refrigerator, where the condenser (heat exchanger) is often built into the metal case or side panels, and not placed on the rear grille, as in older models.
During operation, the compressor compresses the refrigerant, heating it to high temperatures (sometimes up to 60-80 degrees Celsius). This hot gas enters the condenser located inside the walls and releases heat to the surrounding space. Thus, the refrigerator body itself acts as a heating radiator. Heating intensity directly depends on the load: the greater the temperature difference between inside and outside, and the more active the motor works, the hotter the walls will be.
In the first day of operation, heating can be very noticeable, to the point that it will hurt to touch the surface touch. This indicates that the system is operating efficiently and dissipating heat. As you reach the operating mode and reduce the frequency of compressor switching on, the wall temperature will drop to moderately warm. If the walls remain cold while the motor is running, this may indicate a freon leak.
Operating modes and reaching the temperature mode
After the initial start-up and the first shutdown of the compressor, the refrigerator goes into temperature maintenance mode. However, this does not mean that the device is ready to be fully loaded with products. There is the concept of “going to mode,” which implies stabilizing the temperature in all cells, including hard-to-reach corners and areas near the door.
The time required for complete stabilization varies depending on several factors:
- ❄️ Chamber volume - large side-by-side models cool down longer than compact two-chamber refrigerators.
- 🌡️ Room temperature - in a hot kitchen the process will take longer than in a cool one.
- 📦 Amount of food - an empty refrigerator cools down faster, but holds the temperature worse when opening the door.
- ⚙️ Type of control - inverter systems enter mode more smoothly, but may take longer to initially cooling.
Usually, complete establishment of the temperature regime takes from 6 to 12 hours. During this period, the electronics can adjust the duration of compressor operation and pauses. If the model has a function Super Freeze or Quick Cool, it speeds up the engine, reducing preparation time, but increasing energy consumption. It is recommended to load products in small portions, giving the system time to compensate for the heat introduced with them.
☑️ Ready to load products
Table: Standards of time and temperatures for different zones
To understand whether your equipment is working correctly, it is useful to focus on the standard indicators that should be established after the initial run. Below are the average data for a working device at room temperature +25°C.
| Zone / Chamber | Target temperature | Stabilization time | Permissible fluctuations |
|---|---|---|---|
| Freezer compartment | -18°C ... -24°C | 2-4 hours | ±2°C |
| Main chamber (center) | +3°C ... +5°C | 4-6 hours | ±1.5°C |
| Freshness zone (zero) | 0°C ... +2°C | 6-8 hours | ±1°C |
| Door shelves | +6°C ... +8°C | 8-10 hours | ±2°C |
It is worth noting that temperature sensors are located at different points, and the readings on the display (if there is one) may differ from the actual temperature on the shelves, especially in the first hours. Thermal stability is a state when after each opening the door, the system quickly returns the indicators to normal. If you notice that after briefly opening the door, the temperature takes too long to restore, the seal may not fit tightly or air circulation is impaired.
Typical errors during first startup and their consequences
Despite the presence of instructions, users often make mistakes that can shorten the life of the equipment or lead to its breakdown on the first day. One of the most common is ignoring the acclimatization time. If the refrigerator was brought from the cold in winter, you cannot turn it on right away - condensation inside the electronics and congealed oil can damage the unit.
Another common mistake is loading a large amount of warm food at the same time. The introduction of significant thermal mass into a system that has not yet stabilized causes the compressor to run non-stop due to wear and tear, which can lead to overheating of the windings or destruction of the valves. It is also not recommended to set the minimum temperature right away; It’s better to start with average values and gradually lower them.
Do not forget about the installation level. The tilt of the refrigerator affects the operation of the system self-thawing. If the unit is tilted backwards, water from the drainage channel may not flow into the evaporator, but may spill onto the floor or food. If you lean forward, the doors may not close tightly. Adjusting the legs is not just a matter of stability, but an important part of proper operation.
⚠️ Attention: Technical characteristics and operating algorithms may vary depending on the model and year of manufacture. Always check the official user manual for your specific device, as recommendations may be updated by the manufacturer.
Frequently asked questions (FAQ)
How long should you not open the refrigerator after first turning it on?
It is advisable not to open the doors during the first 2-4 hours of operation to allow the system to gain temperature without heat loss from outside. However, if this happened by accident, nothing bad will happen - the cooling process will just take a little longer.
Why does the refrigerator make a loud bang after turning off?
This is a normal physical effect caused by changes in pressure in the system or thermal expansion of materials. Often the sound is made by a pressure equalizing valve or the plastic of the case when it cools down.
Can a refrigerator be connected to the network via an extension cord?
An extension cord can only be used as a last resort, and it must be designed for a current of at least 16A. Direct connection to the outlet is preferable, since poor contact in the extension cord can cause heating and melting.
What to do if the refrigerator does not turn off for more than 5 hours?
On the first day this is acceptable. If the motor runs without stopping for more than 12-14 hours and the temperature does not drop, check the tightness of the doors, the presence of warm food and the temperature in the room. If everything is normal, diagnostics is required.