After delivery and installation of new household appliances, owners are often faced with unusual behavior of the unit. Many people notice that the compressor hums for hours, and the light indication does not switch to standby mode. This raises a natural concern: is the device working properly or should you prepare to return it to the store?
It is important to understand that initial start-up is fundamentally different from normal operation. At this moment, the system just enters the operating temperature mode, cooling not only the air, but also the massive walls of the chambers, shelves, as well as the products that you have already loaded. The process takes significantly longer than a regular cooling cycle.
Continuous operation time depends on many factors: from the ambient temperature in the room to the volume of the freezer. In some cases, the unit can work without interruption for up to a day, and this will be an absolutely normal situation for modern models with inverter compressors.
Physics of the process: why the refrigerator does not turn off immediately
The reason for long-term operation lies in thermodynamic laws. When you turn on refrigeration unit the first time, its internal temperature is equal to the ambient temperature. Sensors detect a significant discrepancy between the current indicators and the specified settings, giving the command to the compressor to work at full power.
Modern models, especially those equipped with a system No Frosthave a complex air circulation system. The cold should be evenly distributed throughout the entire volume, including hard-to-reach corners and drawers. Until the thermostat detects that the target temperature has been reached in all zones, the cooling cycle will not be interrupted.
⚠️ Attention: If you loaded the chamber with room temperature products immediately after turning it on, the operating time will increase by 1.5–2 times. The thermal inertia of food is high, and the refrigerator will require a lot of energy to cool it.
In addition, the refrigerant needs time to fill the evaporator circuits and stabilize the pressure in the system. This is especially true for devices that were transported horizontally. Even if you wait the recommended time before turning it on, oil and freon need several hours for optimal circulation.
Standard operating time indicators for different types of equipment
There is no single figure that would suit all devices. The time of the first cycle directly depends on the design and type of compressor. Old models with conventional motors and modern inverter systems behave differently.
Conventional compressors operate jerkily: they turn on, cool, turn off. When first started, they can work for 6–8 hours continuously, trying to “catch up” with the cold. Inverter models, such as LG Linear Cooling or Samsung Digital Invertermay not turn off at all on the first day, simply reducing the speed to a minimum.
Below is a table showing the approximate operating time before the first shutdown depending on the type of equipment:
| Type refrigerator | Volume of chambers (liters) | Temperature in the room | Expected operating time |
|---|---|---|---|
| Single chamber (drip) | up to 200 | +20...+22°C | 4 - 6 hours |
| Double-chamber (No Frost) | 250 – 350 | +20...+22°C | 8 - 12 hours |
| Multi-chamber (Side-by-Side) | more than 450 | +20...+22°C | 12 – 24 hours |
| Built-in appliances | Any | +20...+22°C | up to 24 hours |
It is worth considering that the indicated values are valid provided that the refrigerator is empty. The presence of heat-intensive products inside the chambers increases these indicators. It is also important that the doors are opened minimally during this period.
Factors influencing the duration of the first cycle
Why did your neighbor’s refrigerator turn off after 5 hours, and yours has been humming for 10? This parameter is influenced by a number of variables that are often overlooked. The first and main factor is ambient temperature.
If the installation is carried out in the summer in a hot kitchen, where the thermometer shows +28...+30°C, heat transfer is difficult. It is more difficult for the condenser to release heat, so the compressor is forced to work longer and more intensely. In winter, with cool air, the process goes faster.
The second factor is the tightness and tightness of the doors. If the seal is new and hard, it may not provide ideal insulation in the first days, allowing warm air to pass through. This causes the sensors to constantly signal a loss of cold.
⚠️ Attention: Incorrect installation can cause the motor to run forever. If the refrigerator is located close to the wall or in a niche without gaps, hot air from the condenser cannot escape, causing overheating and continuous operation.
The third important aspect is the operating mode selected by the user. Setting the minimum temperature (for example, -24°C in the freezer) immediately after switching on will force the equipment to work at its limit. The optimal starting temperature for the first start is average values close to the factory settings.
Features of operation of inverter and linear compressors
Owners of modern equipment often panic ahead of time, not knowing the specifics of their devices. Traditional compressors are either 100% on or off. Inverter models, on the contrary, can work constantly, but with different intensity.
After reaching the desired temperature, such a motor does not turn off completely, but goes into maintenance mode, operating at 10–20% power. This allows you to avoid temperature changes and save energy. In this case, the sound changes from a hum to a quiet hiss or practically disappears.
Linear compressors, often found in brands LG i Electrolux, also have their own characteristics. They start smoothly, without strong inrush current. When first turned on, they can gain temperature very slowly, but evenly, which takes up to 24 hours.
How to distinguish a breakdown from the operation of the inverter?
If the refrigerator is humming, but it is cold inside, and the walls are warm (but not hot) - most likely, it is operating in normal temperature maintenance mode. It is worth sounding the alarm if it is warm inside and the motor does not stop.
It is important not to confuse the quiet operation of the inverter with a malfunction. The absence of characteristic relay clicks and pauses in operation is a normal phenomenon for the latest generation technologies.
The influence of the fast freezing mode on the operating time
Many users, wanting to get cold faster, activate the mode Super Freeze or Quick Cool. This feature forces the compressor to run at maximum speed, ignoring standard shutdown cycles.
In this mode, the refrigerator may not turn off for up to 24 hours until you manually cancel the function or the programmed timer expires (usually 24-48 hours). This is absolutely normal and is designed for blast freezing large volumes of products.
However, using this mode on the first empty start is not recommended. You are putting unnecessary stress on the system without any real need. It is better to let the equipment enter the mode smoothly.
☑️ Check before the first start
When to worry: signs of malfunction
Despite the permissibility of long-term operation, there are limits to what is reasonable. If the refrigerator does not turn off for more than 24–36 hours, and it is not cold inside (or vice versa, everything is frozen into ice), this is a signal of a problem.
Pay attention to the temperature of the case. If the side walls or rear grille getting hot are so painful to touch, this may indicate a freon leak or a clogged capillary tube. The compressor tries to compensate for the lack of refrigerant by continuous operation.
Another alarming symptom is running “idle”. The motor hums, the condenser is warm, but the temperature inside does not drop even after a day. This often indicates a malfunction of the thermostat or defrost sensor, which simply “does not see” that the cold has already been dialed in.
⚠️ Attention: If you smell a burning smell or see that the power cord is very hot where it is connected to the outlet, immediately unplug the device. This may indicate problems with the electrical wiring or an interturn short circuit in the motor windings.
It is also worth checking whether the defrost button is stuck (if it is mechanical) or whether the settings in the electronic control module are not reset. An accidental electronics failure can preserve the “cool” command forever.
The correct algorithm of actions when starting up for the first time
To minimize stress for the equipment and yourself, follow the proven algorithm. First, make sure that the refrigerator has stood upright after delivery for at least 2–4 hours (for winter delivery, the time increases to 6–8 hours).
Plug in the device empty. Do not load food during the first 2-3 hours of operation. Allow the refrigerator to gain initial cold to the empty volume. This will take less time and will allow you to evaluate the operation of the system without the heat load from the products.
After 3-4 hours, check the temperature inside. If it begins to decline, you can gradually load the products, but do not overcrowd the chambers. Leave space for air circulation.
If after a day of continuous operation the temperature inside the chambers does not correspond to the set values, or if the compressor has been running without a break for more than 36 hours, this is a reason to contact an authorized service center for diagnostics.
Is it possible to open the door during the first cooling cycle?
Open the door possible, but highly undesirable. Every time you open the chamber, warm, moist air enters. When first started, this significantly lengthens the operating time of the compressor, since the system has to re-cool the incoming air volume. Try to minimize contact with the cameras in the first 6–8 hours.
Is it normal that the side walls of the refrigerator are hot?
Yes, this is normal, especially when you turn it on for the first time. In modern models, the condenser (heat exchanger) is often built into the side walls. When the compressor is actively operating, they can heat up to 50–60°C. This indicates that the refrigerator is actively releasing the heat it took from the chambers.
What to do if the refrigerator does not turn off for the second day?
If more than 24–30 hours have passed and the motor continues to work without pauses, do the following: 1. Check the tightness of the doors. 2. Make sure the Super Freeze mode is not turned on. 3. Unload the refrigerator and let it run empty. If the situation has not changed and the temperature inside does not stabilize, call a specialist.
Does the amount of products affect the time of first switching on?
Yes, it does dramatically. There is much more heat in products (especially if they are at room temperature) than in air of the same volume. A refrigerator filled with food will take 2–3 times longer to operate than an empty one. It is recommended to load the chambers in stages.