Many users, looking inside the refrigerator compartment, notice a small a round device with a scale, often called a “thermometer”. This element is an integral part of the climate control system, although it does not always display the exact temperature in degrees Celsius. Understanding the principle of its operation allows you to avoid food spoilage and optimize the energy consumption of household appliances.
The question of What does a thermometer in the refrigerator show?often arises due to non-standard scale markings. Instead of the usual numbers from 0 to 10 or 20, you can see values from 1 to 7 or even from Min to Max. This confuses those who are accustomed to linear thermometers, and makes them mistakenly believe that the number means degrees.
In fact, this device is power regulator a compressor, and not just a meter. It tells the control system how hard the motor must work to maintain the set temperature. The higher the value on the scale, the lower the actual temperature inside the chamber, which is a key point for the correct operation of the device.
The principle of operation of the thermostat and explanation of the scale
The main task of the thermostat (thermostat) is to control the operation of the compressor. There is a sensor installed inside the refrigerator that responds to changes in air temperature. When you turn the thermometer knob, you mechanically or electronically change the threshold of this sensor. If the scale ranges from 1 to 7, then one means the minimum cooling power, and seven means the maximum.
It is important to understand the difference between cooling intensity and the final temperature. Setting the knob to maximum does not mean that the camera will become +7 degrees. On the contrary, this will cause the compressor to work almost non-stop, trying to reach extremely low values, which can lead to freezing of food in the refrigerator compartment and the formation of an ice crust on the back wall.
⚠️ Attention: Setting the regulator to the maximum value (for example, 7 or Max) in normal operation leads to overload of the compressor and significant increase in electricity bill. Use this mode only for rapid cooling of large volumes of food.
In modern models with electronic control, the situation may be different. There, the “thermometer” is replaced by a digital display where you set a specific temperature in degrees Celsius. However, in classical mechanical systems such as Atlant, Biryusa or older models Indesitthe scale remains abstract. Understanding this logic is the first step towards proper setup.
What do the numbers on the temperature regulator mean?
The numbers on the thermostat scale are conventional units of power. They do not have a direct mathematical connection with degrees Celsius, although they correlate with them. Let's look at what exactly the “thermometer” shows depending on the position of the knob.
- 🌡️ Min / 1: The compressor turns on rarely and operates in short cycles. The temperature in the chamber can rise to +8..+10°C, which is acceptable for storing vegetables, but risky for meat and dairy products.
- ❄️ Average values (3-4): Standard operating mode. The system maintains a temperature in the range of +3..+5°C, which is the ideal condition for most food products.
- 🧊 Max / 7: Emergency or fast freezing mode. The compressor runs continuously. The temperature may drop below 0°C, which will lead to crystallization of moisture in vegetables and deterioration of the food structure.
Some users mistakenly believe that the number indicates the number of degrees above zero. That is, they think that “5” means +5°C. This is a dangerous misconception. In reality, when set to “5”, the temperature can drop to +2°C or even lower, depending on the ambient temperature in the kitchen and the load on the refrigerator.
The exact correspondence of the number and degrees depends on the model of the refrigerator and the type of refrigerant. For example, in units using Freon R600a, the system can respond faster than in older models with R134a. Therefore, you should not rely on abstract numbers without checking with a real thermometer.
How to check the real temperature in the refrigerator
Since the built-in “thermometer” shows only conditional power, an external measuring device is required to accurately diagnose the condition of the products. An ordinary household thermometer will help you understand what is actually happening inside the chamber.
The verification procedure is quite simple, but it takes time. You will need a glass of water and an outdoor or kitchen thermometer capable of measuring from -10 to +50°C. Place a glass of water on the middle shelf, lower the thermometer there and leave for 5-6 hours. The door cannot be opened at this time, as this will upset the thermal balance.
⚠️ Attention: Do not use mercury thermometers to check inside the refrigerator to avoid breaking and contamination of food with dangerous metal. Use alcohol or electronic analogues.
After the time has elapsed, take readings. If the water temperature is within +3..+5°C, then your “thermometer” is set correctly. If the readings are above +7°C, it is necessary to increase the cooling power. If the water begins to freeze or the temperature is below +2°C, the regulator needs to be turned down.
☑️ Checking the temperature
This simple manipulation allows you to calibrate the operation of the refrigerator without calling a technician. It is especially relevant if you notice that food has begun to deteriorate faster than usual or, conversely, the milk in the jug turns into an ice block.
Table of correspondence of modes and temperatures
For ease of understanding the relationship between the position of the regulator knob and the actual temperature inside the chamber, the following table has been compiled. Please note that the data are averaged for standard operating conditions (kitchen temperature +20..+25°C).
| Knob position | Operating mode | Expected t°C in the chamber | Influence on compressor |
|---|---|---|---|
| 1 (Min) | Economy | +7..+9°C | Rare starts |
| 3 (Average) | Normal | +3..+5°C | Normal cycle |
| 5 (High) | Intensive | +1..+2°C | Frequent operation |
| 7 (Max) | Turbo | 0°C and below | Continuous operation |
From the table It can be seen that the adjustment range is quite wide. Shifting the knob just one notch can change the temperature by 2-3 degrees, which significantly affects the shelf life of perishable foods. This is why precise adjustment is so important.
It is worth considering that the temperature may differ in different zones of the refrigerator. It is always colder at the back wall, where evaporatoris located, than at the door. Therefore, the “thermometer” averages the readings, focusing on a sensor, usually located in the upper part of the chamber or built into the housing.
Why is the temperature at the back wall lower?
The evaporator is located there - a tube through which cooled refrigerant circulates. It is this element that “takes” heat from the chamber. In models with the No Frost system, the evaporator is hidden, but the principle of cold flow from the rear wall is preserved.
Causes of incorrect readings and breakdowns
Sometimes users notice that the refrigerator has stopped responding to twisting the thermometer handle. Food spoils in any position, or, conversely, everything freezes. This indicates a malfunction of the thermoregulation system.
One of the common reasons is the failure of the thermoregulation system itself thermostat. In mechanical models, the filler gas inside the bellows tube may evaporate or the seal may be compromised. As a result, the sensor stops sensing temperature changes and does not give a command to turn the compressor on or off.
- 🔌 Problems with contacts: Oxidation of the contacts inside the regulator can lead to unstable operation. The compressor may hum, but not start, or turn off too early.
- 🧊 Sensor freezing: In refrigerators with manual defrosting, the thermostat sensor may become coated with ice, which distorts its readings. It “thinks” that the chamber is warmer than it actually is and does not turn off the motor.
- ⚙️ Electronics failure: In models with electronic control, the problem may lie in the control board or a malfunction of the air temperature sensor.
If you turn the knob, but there is no characteristic click (in mechanics) or a change in the sound of the motor, most likely the regulator is faulty. Also a sign of a breakdown is the continuous operation of the refrigerator even with an empty chamber and minimal settings.
⚠️ Attention: If you suspect a thermostat malfunction, do not try to repair it yourself if you do not have electrical skills. Improper replacement can lead to a short circuit or refrigerant leak.
The influence of external factors on the operation of the thermometer
In the summer, when the room temperature rises, heat inflows increase. To maintain the temperature set by the “thermometer”, the compressor has to work longer.
In winter, the situation may be the opposite. If the refrigerator is in an unheated room or next to a window, cold air from outside can “fool” the sensor. It will assume that the chamber is cold enough and the compressor will rarely turn on. This can lead to defrosting of the products, since outside cold alone is not enough for a full cooling cycle.
It also affects the readings and actual efficiency. chamber loading. A full refrigerator keeps the temperature more stable than an empty one. The thermal inertia of products (especially bottled water) helps smooth out temperature changes when the door is opened.
The placement of the refrigerator also plays a role. If it stands close to the wall or next to the radiator/stove, heat exchange is disrupted. The condenser (grid at the back) cannot efficiently transfer heat, and the cooling system is overloaded, no matter what the regulator indicates.
FAQ: Frequently Asked Questions
Why are there no degrees in the refrigerator, only numbers?
This is done to simplify the design and reduce the cost of production. It is easier for a mechanical thermostat to operate with relative units of refrigerant compression power than to accurately calibrate the scale in degrees Celsius, which can “float” depending on operating conditions.
Is it possible to replace a mechanical “thermometer” with an electronic one?
Theoretically, this is possible, but requires deep modernization: installation of a new controller, sensors and display. Under factory conditions, such changes are not provided, and independent alterations may void the warranty and disrupt the operation of the safety system.
What to do if the control knob rotates endlessly?
If the knob rotates in a circle without clicks and without changing the operating mode (the compressor does not turn off), this is a sign of a thermostat failure. Most likely, the mechanism inside has collapsed or the stopper has been lost. The part needs to be replaced.
Does the type of product affect the thermometer setting?
Yes. If you have loaded your refrigerator with a lot of warm food, it makes sense to temporarily increase the power (turn the knob to a higher value) to cool the contents faster. After stabilizing the temperature, the regulator must be returned to its normal position.