After the defrosting procedure refrigeration chamber, many owners of household appliances are faced with a situation where the unit operates without interruption for a long time. This phenomenon causes reasonable concern: whether the device has broken down, whether the motor has burned out, and whether it will be necessary to call a specialist for expensive repairs. There is no need to panic ahead of time, since the operating mode of the engine in the first hours after switching on has its own physiological and technical characteristics, determined by the need to restore the temperature regime.
Under normal conditions refrigeration circuit it must reach the set temperature within a certain period of time, which varies depending on the model and volume of the chamber. However, if the engine has been humming for several hours in a row, it is important to understand whether this is within acceptable limits or indicates a hidden malfunction. In this article, we will analyze in detail the temporary standards, influencing factors and the algorithm of action in case of suspected breakdown.
The initial start-up is always stressful for the system, since the refrigerant must circulate throughout the entire volume of the tubes, and the chamber walls must be cooled to the required values. The duration of this process depends on many variables, including the ambient temperature in the room and the tightness of the seals. Understanding these processes will help you correctly assess the condition of the equipment Indesit, Bosch or any other brand.
Physiological processes during initial startup
When you turn on a defrosted refrigerator, the thermostat or electronic control module records the high temperature inside the chambers, often equal to room temperature. At this moment, the system gives a command to continuously operate the compressor in order to quickly reduce the degrees to the target values. This is the normal mode, which engineers call the “intensive cooling” mode.
Unlike the usual cycle, where the motor turns on and off at certain intervals, here cooling cycle can last continuously. The heat capacity of the products that you immediately loaded into the chamber also plays a role: if you place warm bottles or products at room temperature, the load on the system will increase many times over. The engine will operate until the sensors record that the specified parameters have been achieved.
⚠️ Attention: If, after the products have completely cooled and 10-12 hours have elapsed, the compressor continues to operate without a single pause, this indicates a violation in the thermoregulation system or a freon leak.
It is important to consider that modern inverter models LG or Samsung may behave differently than older linear compressors. They do not turn off completely, but reduce the speed to a minimum, maintaining the temperature. Therefore, a quiet hum may be a sign of normal operation and not a breakdown.
Standard indicators of operating time
There are average technical standards that determine how much time a working unit requires to reach operating mode. For most middle-class household models, this period ranges from 2 to 6 hours. During this time refrigerant actively circulates, freezing the evaporator and cooling the internal volume.
If we consider in more detail, we can distinguish several time periods characteristic of different situations. A short cycle of 1-2 hours is only possible with an empty chamber and low room temperature. The standard loading cycle takes longer. Below is a table showing the dependence of operating time on operating conditions.
| Operating conditions | Expected operating time before the first shutdown | System status |
|---|---|---|
| Empty chamber, room temperature +20°C | 1.5 - 3 hours | Normal |
| Full load with products | 4 - 7 hours | Normal |
| High room temperature (+28°C and above) | 6 - 10 hours | Acceptable |
| Work for more than 12 hours without a break | Endless | Diagnostics required |
It is worth noting that the indicated figures are relevant for equipment produced in the last 10-15 years. Old Soviet refrigerators or models with an open evaporator may take longer to freeze due to less effective thermal insulation of the body. In such cases, an 8-hour cycle can be considered the norm.
Factors influencing the duration of cooling
Why does the refrigerator cope in some cases in a couple of hours, while in others it hums all day? The answer lies in a combination of external and internal factors. The first and main condition is ambient temperature. If the unit is in the kitchen, where the oven is running or the sun is shining, the heat transfer efficiency of the condenser drops, and the motor is forced to work harder.
The second important aspect is the tightness of the circuit and the condition of the sealing rubber. If the door does not fit tightly, warm air saturated with moisture constantly flows inside. The cooling system tries to compensate for the heat gain by working non-stop. The quantity and temperature of loaded products also affects.
- 🌡️ Room temperature: the hotter the room, the longer the first cooling cycle will last.
- 🥩 Product temperature: loading warm products significantly increases the operating time of the compressor.
- 🚪 Tightness: not tight a door seal or a damaged seal reduces the cooling efficiency to zero.
- ❄️ Condition of the evaporator: the presence of an ice coat (in No Frost systems in the event of a defrost malfunction) interferes with heat transfer.
Separately, it is worth mentioning the technical condition of the compressor itself. If the oil in it has thickened or exhausted its service life, the efficiency drops. The engine runs, but does not create enough pressure for rapid circulation of freon, which leads to an increase in operating time.
Features of various cooling systems
The time it takes to reach the mode directly depends on what kind of defrosting system is installed in your refrigerator. Devices with manual defrosting (drip system) usually cool faster, since they have direct contact of the evaporator with the food or the chamber wall. Here heat exchange occurs more efficiently.
Systems No Frost ("without frost") are more complex. In them, cooling occurs through a hidden evaporator, and cold air is pumped by a fan. After defrosting, such a refrigerator requires time not only to cool the air, but also to freeze the air ducts. Therefore operation cycle No Frost models are often longer than their drip counterparts.
⚠️ Attention: In No Frost refrigerators, after defrosting, be sure to check whether the fan is spinning. If it does not work, the cold will not enter the chamber, and the compressor will hum endlessly, trying to cool the sensor.
Modern dual-circuit systems, where separate evaporators and sometimes even separate compressors are used for the refrigerating and freezing chambers, demonstrate the most stable performance. If in such a model one of the circuits works for too long, the problem is most likely localized in this circuit or in the refrigerant distribution system.
Why are two-compressor models better?
In such refrigerators, the failure of one compressor does not lead to complete damage to the products in the second compartment. In addition, the load is distributed between two motors, which extends the service life of the equipment.
Algorithm for checking the health of the equipment
If more than 8-10 hours have passed and the refrigerator continues to work without interruption, it is necessary to carry out initial diagnostics. Do not rush to call a specialist; many problems can be identified on your own by following simple instructions. This will help save time and money, and also provide accurate information for the specialist.
Start with a visual inspection and checking the operating conditions. Make sure nothing is blocking air circulation around the back wall. Then check the tightness of the door and the temperature inside the chambers. If you have a thermometer, use it for an objective assessment.
☑️ Diagnostics of the refrigerator after defrosting
An important step is checking the thermostat. In mechanical models, you can try reducing the cooling power a little. If after this the compressor turns off, then the problem was in the settings or stuck contacts. In electronic models Electrolux or Haier it is worth trying to reset the settings to factory settings.
Possible malfunctions and their symptoms
When all external factors are excluded, and the engine still does not turn off, we are talking about a technical malfunction. The most common reason is refrigerant leak. Freon evaporates through microcracks, the pressure in the system drops, and the compressor idles, trying to gain pressure, but not cooling the chamber.
Another common problem is the failure of the thermostat or temperature sensor. If the sensor “freezes” and shows that it is still warm in the chamber, it will not give the command to turn off the motor. In this case, the refrigerator will freeze until it turns into an ice monolith.
- 🔇 Silence inside the chambers: the compressor is humming, but there is no cold (a sign of a leak or capillary blockage).
- 🧊 Ice coat: food is frozen to the wall, which indicates a malfunction of the defrost system or thermostat.
- 🔥 Hot case: if the side walls are hot and the inside is warm, the condenser may be clogged or the fan is faulty.
- ⚡ Frequent clicks: an attempt to start the compressor indicates problems with the start relay or the motor itself.
It is also impossible prevent damage to the compressor itself. If it works, but does not create the required pressure drop (weak compression), the system will not be able to enter the mode. This often happens in older models or after power surges in the network.
Frequently asked questions (FAQ)
Is it normal for the refrigerator to run for 5 hours without stopping after defrosting?
Yes, this is an absolutely normal situation. For the first 5-6 hours, the unit operates in intensive mode to cool the entire internal volume and products. If after 6 hours it turns off and turns on again after a while, then the equipment is working.
What will happen if you do not turn off the refrigerator from the network during defrosting?
Modern models Beko or Whirlpool with the No Frost system have automatic defrosting, and they do not need to be disabled. However, if you are defrosting an old refrigerator manually, turning it off is necessary, otherwise the compressor will run empty and the ice will not melt.
Why does the refrigerator hum, but does not freeze after turning on?
Most likely, there is a refrigerant leak or a clogged capillary tube. In this case, the compressor works, but freon does not circulate through the system. Professional repair is required.
Is it possible to speed up the cooling process after defrosting?
It is not recommended to artificially speed up the process (for example, by placing containers with ice inside), as this may disrupt the operation of the sensors. It’s better not to open the door during the first hours of operation and not to load warm food.